HomeMy WebLinkAbout20210208_WQHP_2-3-2020Priority Project
Water Quality and Hydrology Plan (WQHP)
Project Name:
NORTON RESIDENCE
Prepared for:
Sean Norton
6806 W. Ocean Front
Newport Beach, CA 92663
Tel: (949) 281-8200
Prepared by:
Toal Engineering, Inc.
139 Avenida Navarro
San Clemente, CA 92672
Tel: (949) 492-8586
Engineer: Adam L. Toal, PE Registration No.: RCE 59275
Prepared on:
February 03, 2020
PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE Owner’s Cer!fica!on
21002-wqhp-body
This Water Quality Management Plan (WQMP) has been prepared for Sean Norton by Toal
Engineering, Inc. The WQMP is intended to comply with the requirements of the local NPDES
Stormwater Program requiring the preparation of the plan.
The undersigned, while it owns the subject property, is responsible for the implementation of
the provisions of this plan and will ensure that this plan is amended as appropriate to reflect
up-to-date conditions on the site consistent with the current Orange County Drainage Area
Management Plan (DAMP) and the intent of the non-point source NPDES Permit for Waste
Discharge Requirements for the County of Orange, Orange County Flood Control District and
the incorporated Cities of Orange County within the Santa Ana Region. Once the undersigned
transfers its interest in the property, its successors-in-interest shall bear the aforementioned
responsibility to implement and amend the WQMP. An appropriate number of approved and
signed copies of this document shall be available on the subject site in perpetuity.
Owner:
Name/Title Sean Norton
Company N/A
Address 6806 W. Oceanfront, Newport Beach, CA 92663
Email N/A
Telephone # (949) 637-5220
Signature Date
Project Owner’s Certification
Permit/Application No. PA 2021-____ Grading Permit
No. N/A
Tract/Parcel Map No.
Seashore Colony
Por. Lots 3 & 4,
Block H
Building Permit
No. N/A
CUP, SUP, and/or APN (Specify Lot Numbers if Portions of Tract)
6806 W. Oceanfront,
Newport Beach
APN 045-033-17
2/8/21
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PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE Table of Contents
21002-wqhp-body
Contents Page No.
I Discretionary Permit(s) and Water Quality Conditions…………….3
II.1 Project Description ............................................................................. 4
II.2 Potential Stormwater Pollutants ...................................................... 6
II.5 Property Ownership/Management ................................................... 8
III.1 Physical Setting ................................................................................... 9
III.3 Watershed Description ....................................................................... 11
IV. 1 Project Performance Criteria ............................................................ 12
IV.3.1 Hydrologic Source Controls ..................................................................... 16
IV.3.2 Infiltration BMPs ....................................................................................... 17
Table 2.7: Infiltration BMP Feasibility Worksheet .................................................... 18
Table 2.7: Infiltration BMP Feasibility Worksheet (continued) ................................ 19
IV.3.3 Evapotranspiration, Rainwater Harvesting BMPs ................................. 20
IV.3.4 Biotreatment BMPs .................................................................................. 22
IV.3.5 Hydromodification Control BMPs ............................................................ 23
IV.3.6 Regional/Sub-Regional LID BMPs .......................................................... 23
IV.3.7 Treatment Control BMPs ......................................................................... 23
IV.3.8 Non-structural Source Control BMPs ..................................................... 24
IV.3.9 Structural Source Control BMPs ............................................................. 26
IV.4.1 Water Quality Credits .................................................................. 28
IV.4.2 Alternative Compliance Plan Information ................................ 29
V Inspection/Maintenance Responsibility for BMPs………………...23
VI Site Plan and Drainage Plan…………………………..…………………24
VII Educational Materials…………………………………..…………………25
Attachments
Attachment A…………………………………………………..……………………… BMP Fact Sheets
Attachment B……………………………………………………………….……Educational Materials
Attachment C…………………………………..……………………………………………Location Map
Attachment D……...……..…………….……………………………Operation & Maintenance Plan
Attachment E……………….…… Soils Report Groundwater pages and infiltration approval
PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
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Section I Discretionary Permit(s) and
Water Quality Conditions
Project Infomation
Permit/Application No. PA 2021-____ Tract/Parcel Map No. Seashore Colony Por.
Lots 3 & 4, Block H
Additional Information/
Comments:
6806 W. Ocean Front, Newport Beach, CA 92663
APN 045-033-17
Water Quality Conditions
Water Quality Conditions
(list verbatim)
1.A WQHP shall be required for a development of water quality
concern that requires a coastal development permit and has the
potential for adverse water quality or hydrologic impacts to
coastal waters, including development that entails construction
or entails activities or changes in land use other than
construction.
2.Seventy-Five (75) Percent Impervious Surface Area.
Development where seventy-five percent or more of the sites
surface area will be impervious surfaces.
Watershed-Based Plan Conditions
Provide applicable
conditions from watershed
-based plans including
WIHMPs and TMDLS.
The project site is located in the Newport Bay Watershed, located
in the Santa Ana region. At the time of this report, a WIHMP for the
"Newport
Bay- Newport Coast" Watershed has not been approved. TMDL
information is provided in Section III.3.
PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
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Section II Project Description
II.1 Project Description
Description of Proposed Project
Development Category
(Verbatim from WQMP):
1.A WQHP shall be required for a development of water quality
concern that requires a coastal development permit and has the
potential for adverse water quality or hydrologic impacts to coastal
waters, including development that entails construction or entails
activities or changes in land use other than construction.
2.Seventy-Five (75) Percent Impervious Surface Area. Development
where seventy-five percent or more of the sites surface area will be
impervious surfaces.
Project Area (ft2): 2,255 Number of Dwelling Units: 1 SIC Code: 1521
Narrative Project
Description:
The proposed project consists of: 1) the demolition and removal of on-
site improvements within the proposed development limits; and 2)
construction of a custom single family residence, and appurtenant
hardscape and drainage improvements.
Project Area
Pervious Impervious
Area
(acres or sq ft) Percentage Area
(acres or sq ft) Percentage
Pre-Project Conditions 725 sq. ft. 32% 1,530 sq. ft. 68%
Post-Project Conditions 0 sq. ft. 0% 2,255 sq. ft. 100%
Drainage
Patterns/Connections
The developed portion of the site runoff currently sheet flows
northerly into the Alley along the front of the property where it
enters the existing city storm drain system and ultimately
discharged into the Pacific Ocean.
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PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
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The project consists of the construction of a new single family
residence with appurtenant hardscape and walls. Areas, as well as
total percentage of the project area, of each different type of
improvement are listed below:
Lot size: 2,255 sf (0.052 ac)
Project Area (Disturbed Area): 2,255 sf (0.052ac)
Building footprint:1,432 sf (0.033 ac) 63% Of
project area
Total proposed hardscape areas (excluding buildings): 823 sf
(0.019 ac) 37% Total proposed landscape areas: 0 sf (0.0 ac) 0%
Total impervious area (roof/hardscape) tributary to planter box
treatment units: 2,255 sf (0.052 ac)
Walkways connecting driveways, patios, and other hardscape features
are minimal for this small lot. All runoff discharging to the infiltration
trench at the front yard as described and designed in Section IV of this
report. Run-off from high intensity storm events will overflow the
infiltration trench gravity flow to the flowline at alley in the front of the
site where it will enter the city storm drain system and ultimately the
Pacific Ocean.
The Plot Plan in Section VI shows the site improvements to scale.
PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
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II.2 Potential Stormwater Pollutants
Pollutants of Concern
Pollutant
Choose One:
E=Expected to
be of concern
N=Not Expected
to be of concern
Additional Information and Comments
Suspended-Solid/ Sediment E N Expected pollutant for residential development.
Nutrients E N Expected pollutant for residential development.
Heavy Metals E N
Pathogens (Bacteria/Virus) E N Expected pollutant for residential development.
Pesticides E N Expected pollutant for residential development.
Oil and Grease E N Expected pollutant for residential development.
Toxic Organic Compounds E N
Trash and Debris E N Expected pollutant for residential development.
PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
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II.3 Hydrologic Conditions of Concern
Determine if streams located downstream from the project area are determined to be potentially
susceptible to hydromodification impacts.
No – Show map
Yes – Describe applicable hydrologic conditions of concern below.
http://nbgis.newportbeachca.gov/NewportHTML5Viewer/?viewer=newportbeachgis
Runoff enters lined city storm drain catch basin and storm drain system at the Sea Shore street.
See image below showing runoff direction. Per the Orange County Watershed Susceptibility
map, the site is not within potential areas of erosion.
Site
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1~.,-WKID: 4326 l.aVlong A
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Lat: 33.62923" N
Lon: 117.95396" W
/
e------i
0 50 100ft
PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
21002-wqhp-body Page 8
II.4 Post Development Drainage Characteristics
The site drainage system is designed to treat and partially retain runoff via INF-2 Infiltration
Trench prior to discharge in order to eliminate direct discharge into the Pacific Ocean. The side
yards and rearyard have been designed to discharge to infiltration trench via concrete swale. The
roof downspouts at front yard will discharge directly to the infiltration trench drain. All other
downspouts will be discharged directly to the concrete swales along the side yards which will
flow into the Infiltration trench at the front of the property for treatment prior to discharge.
Drainage from paved areas shall be directed to flow away from the building foundation prior to
collection by the proposed area drain system.
The proposed BMPs will remove sediment and pollutants through volume reduction before the
runoff enters the City drainage system. In large storms, overflows of clean runoff will overflow and
bypass the BMPs and flow directly to the Alley then to Seashore Drive where it enters the existing
city storm drain system and ultimately into the Pacific Ocean.
Refer to the WQHP Plot Plan located in Section VI
II.5 Property Ownership/Management
The property is a single family private residence and will be owned and maintained by Mr. Sean
Norton. Maintenance contractors may be hired by the owner to perform maintenance duties.
However, all storm water facilities will remain the responsibility of the homeowner.
PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
21002-wqhp-body Page 9
Section III Site Description
III.1 Physical Setting
Planning Area/
Community Name
Far West Newport Residence Association
Location/Address 707 Saint James Road, Newport Beach, CA 92663
Project Area Description The subject site is a single-family residential lot located on the
Southside of West Oceanfront. The property is currently developed
with a residential building, and associated hardscape features such
as walkways, patios, concrete driveway, side yard screen walls, and
fences. The project site is bounded on the south by beach area, on
the north by Alley, and on the east and west by similarly sized
residential properties.
Land Use RS-D: Single-Unit Residential Detached
Zoning RLD-9
Acreage The site measures 2,255 square feet (0052 acres). The entire site will
be disturbed as a result of this development. The proposed
redevelopment results in the addition/replacement of 2,255 sq. ft. of
impervious surfaces.
Predominant Soil Type Per the Orange County Hydrology Manual, the project is located in
an area with Type HSG-A soils.
PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
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III.2 Site Characteristics
Precipitation Zone Per the Orange County Rainfall Zones Map, the project site is within the
rainfall zone with a Design Capture Storm Depth of 0.70 inches.
Topography
The rectangular-shaped lot currently is the site of a single-family residence
with hardscape features. The site has a fall of 1’ toward the alley. There is a
beach area behind the site.
Drainage
Patterns/Connections
Existing drainage patterns. The project site is located in the Santa Ana river
Watershed, located in the Santa Ana region. Site runoff currently discharges
to the existing city storm drain system at the Alley and ultimately into the
Pacific Ocean.
Proposed drainage patterns: The proposed drainage plan will collect runoff
via concrete swale along side yards, which will flow into an infiltration
trench, and discharge to the existing flow line in Alley then discharges to Sea
Shore Drive and ultimately into the Pacific Ocean.
Soil Type, Geology, and
Infiltration Properties
This site is within an area designated “Soil Type HSG-A” per the Orange
County Hydrology Manual.
Site Characteristics (continued)
Hydrogeologic
(Groundwater)
Conditions
Per the project soils report prepared by LGC Geotechnical Inc, The
groundwater was encountered during our recent subsurface exploration at a
depth of approximately 8’ to 10’ below the existing ground surface correlating
to an approximate elevation of 5 to 3 feet above mean sea level (msl).
Fluctuation in site groundwater should be anticipated as a result of tidal
variations due to the close proximity to the ocean. See Attachment E.
Geotechnical Conditions
(relevant to infiltration)
The site is underlain by Soil Type A. The soils report has indicated
groundwater at a depth of 8’ to 10’ below the existing ground surface.
This will put the bottom of the infiltration trench 5 to 7 feet above the
groundwater level.
Off-Site Drainage None.
Utility and Infrastructure
Information
Service laterals will be taken from utility main lines within the adjacent street
and alley rights-of-way.
PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
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III.3 Watershed Description
Receiving Waters Newport bay, Pacific Ocean.
303(d) Listed Impairments
Low Newport Bay is 303(d) listed by the State Water Resources Control
Board for the following impairments: Chlordane, Copper, DDT, Indicator
Bacteria, Nutrients, PCBs, and Pesticides.
Applicable TMDLs
Total Maximum Daily Loads (TMDLs) have been established for Copper,
Indicator Bacteria, Nutrients, Pesticides and Sediment; TMDLs are proposed
for the remaining 303(d) listed pollutants, but are not currently in effect.
Pollutants of Concern for
the Project Please see page 5.
Environmentally Sensitive
and Special Biological
Significant Areas
Newport Bay is an ESA, as it is a waterbody listed on the CW Section 303(d)
list of impaired waters. Site runoff will be treated prior to off-site discharge.
See section IV for BMP sizing.
PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
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Section IV Best Management Practices (BMPs)
IV. 1 Project Performance Criteria
Describe project performance criteria. Several steps must be followed in order to determine what
performance criteria will apply to a project. These steps include:
• If the project has an approved WIHMP or equivalent, then any watershed specific criteria
must be used and the project can evaluate participation in the approved regional or sub-
regional opportunities. The local Permittee planning or NPDES staff should be consulted
regarding the existence of an approved WIHMP or equivalent.
• Determine applicable hydromodification control performance criteria.
• Determine applicable LID performance criteria.
• Determine applicable treatment control BMP performance criteria.
• Calculate the LID design storm capture volume for the project.
Is there an approved WIHMP or equivalent for the project area that
includes more stringent LID feasibility criteria or if there are
opportunities identified for implementing LID on regional or sub-
regional basis?
YES NO
If yes, describe WIHMP
feasibility criteria or
regional/sub-regional LID
opportunities.
N/A.
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PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
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Project Performance Criteria (continued)
If HCOC exists,
list applicable
hydromodification
control
performance
criteria (Section
7.II-2.4.2.2 in
MWQMP)
For projects that may have an impact on the site’s hydrologic regime, an assessment
of potential hydromodification impacts and appropriate controls is required. If an
HCOC exists, priority projects shall implement on-site or regional hydromodification
controls such that:
• Post-development runoff volume for the two-year frequency storm does not
exceed that of the predevelopment condition by more than five percent, and
• Time of concentration of post-development runoff for the two-year storm event
is not less than that for the predevelopment condition by more than five percent.
List applicable LID
performance
criteria (Section
7.II-2.4.3 from
MWQMP)
• Priority Projects must infiltrate, harvest and use, evapotranspirate, or
biotreat/biofilter, the 85th percentile, 24-hour storm event (Design Capture
Volume).
• A properly designed biotreatment system may only be considered if infiltration,
harvest and use, and evapotranspiration (ET) cannot be feasibly implemented for
the full design capture volume. In this case infiltration, harvest and use, and ET
practices must be implemented to the greatest extent feasible and biotreatment
may be provided for the remaining design capture volume.
List applicable
treatment control
BMP performance
criteria (Section
7.II-3.2.2 from
MWQMP)
• If treatment control BMPs can treat all of the remaining unmet volume and have
a medium to high effectiveness for reducing the primary POCs, the project is
considered to be in compliance.
• If the cost of providing treatment control BMPs greatly outweighs the pollution
control benefits they would provide, a waiver of treatment control and LID
requirements can be requested and alternative compliance approaches must be
used to fulfill the remaining unmet volume.
Calculate LID
design storm
capture volume
for Project.
V = C * d * A * 43,560 sq. ft./acre * 1/12 in./ft
Where:
C = runoff coefficient = 0.75 * imp + 0.15 (imp = impervious area fraction = 0.90) =
0.90
d = Design Capture Storm Depth (0.70 in. per Orange County Rainfall Zones Map)
A = project area = 0.052 acres (2,255 sq. ft.)
V = 0.90 * 0.70 in. * 0.052 * 43560 sq. ft./acre * 1/12 in./ft
V = 119 cu. ft.
PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
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Worksheet B: Simple Design Capture Volume Sizing Method
Step 1: Determine the design capture storm depth used for calculating volume
1
Enter design capture storm depth from Figure III.1, d (inches) d= 0.7 inches
2
Enter the effect of provided HSCs, dHSC (inches)
(Worksheet A) dHSC= - inches
3
Calculate the remainder of the design capture storm depth,
dremainder (inches) (Line 1 – Line 2) dremainder= 0.7 inches
Step 2: Calculate the DCV
1
Enter Project area tributary to BMP (s), A (acres) A= 0.052 acres
2
Enter Project Imperviousness, imp (unitless) imp= 1.0
3
Calculate runoff coefficient, C= (0.75 x imp) + 0.15 C= 0.90
4
Calculate runoff volume, Vdesign= (C x dremainder x A x 43560 x
(1/12)) Vdesign= 119 cu-ft
Step 3: Design BMPs to ensure full retention of the DCV
Step 3a: Determine design infiltration rate
1
Enter measured infiltration rate, Kmeasured (in/hr)
(Appendix VII) Kmeasured= In/hr
2
Enter combined safety factor from Worksheet H, Sfinal (unitless) Sfinal=
3
Calculate design infiltration rate, Kdesign = Kmeasured / Sfinal Kdesign= In/hr
Step 3b: Determine minimum BMP footprint
4
Enter drawdown time, T (max 48 hours) T= Hours
5
Calculate max retention depth that can be drawn down within the
drawdown time (feet), Dmax = Kdesign x T x (1/12) Dmax= feet
6
Calculate minimum area required for BMP (sq-ft), Amin = Vdesign/
dmax
Amin= sq-ft
PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
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IV.2. SITE DESIGN AND DRAINAGE PLAN
The following Site Design Practices have been considered for the proposed residential development:
- Preserve Existing Drainage Patterns and Time of Concentration (to the MEP)
- Disconnect Impervious Area (by providing landscape improvements between, and adjacent to,
proposed impervious walkways and driveway, where possible)
- Minimize Construction Footprint (construction will be limited to only the area designated for
improvements)
The proposed site improvements include the residence, driveway, exterior impervious walkways, patios, and
hardscaep improvements. The construction footprint shall be limited to only the areas designated for
improvements per the Precise Grading and Drainage Plans prepared by Toal Engineering, Inc.
There is one Drainage Management Areas (DMA) for this single-family residential development. The selected
LID BMP will be used to meet the calculated Design Flow for the project DMA:
- Infiltration Trench unit (Infiltration BMP-INF 2) – located on front yard, per City standard
DMA Area (sq. ft.) % Impervious BMP Type Size
1 2,255 1 INF-2: Infiltration Trench 11 CF
See discussion for the selected BMP in Section IV.3.1.
See the WQMP Site Plan provided in Section VI of this report for locations of site improvements and the
selected Infiltration BMP.
the GIS coordinate for onsite BMP is: 33° 37’ 40.57” - 117° 57’ 11.65”
I I
PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
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IV.3 LID BMP SELECTION AND PROJECT CONFORMANCE ANALYSIS
IV.3.1 Hydrologic Source Controls
Name Included?
Localized on-lot infiltration
Impervious area dispersion (e.g. roof top
disconnection)
Street trees (canopy interception)
Residential rain barrels (not actively managed)
Green roofs/Brown roofs
Blue roofs
Impervious area reduction (e.g. permeable
pavers, site design)
Impervious roof dispersion and localized on-lot infiltration have not been used because of the site
constraints. Planter areas were not used because of the small available space in both the sideyards and the
rear deck area. The entire DCV is being treated/retained with the use of an infiltration trench.
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PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
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IV.3.2 Infiltration BMPs
Name Included?
Bioretention without underdrains
Rain gardens
Porous landscaping
Infiltration planters
Retention swales
Infiltration trenches
Infiltration basins
Drywells
Subsurface infiltration galleries
French drains
Permeable asphalt
Permeable concrete
Permeable concrete pavers
Other:
Other:
The sizing has been done per the City of Newport Beach’s prescriptive requirements of “One 15’ long
French drain per maximum of 2,000 sf of impervious area”. Therefore the sizing for this lot is:
2,255 s.f. x (15’ Long French drain)/(2,000 s.f. of impervious area) = 17’ (minimum length) French drain
by 1’ wide and 1’ deep. The provided French drain length for this project= 30’ …..OK
A French drain detail (1’ wide x 3’ deep) has been used for this project. Please see the BMP exhibit Site
Plan in Section VI for infiltration trench location and details.
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Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
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Table 2.7: Infiltration BMP Feasibility Worksheet
Infeasibility Criteria Yes No
1
Would Infiltration BMPs pose significant risk for
groundwater related concerns? Refer to Appendix VII
(Worksheet I) for guidance on groundwater-related
infiltration feasibility criteria.
X
See soils engineer approval for infiltration due to high groundwater in Attachment E.
2
Would Infiltration BMPs pose significant risk of
increasing risk of geotechnical hazards that cannot be
mitigated to an acceptable level? (Yes if the answer to
any of the following questions is yes, as established by a
geotechnical expert):
The BMP can only be located less than 50 feet away from
slopes steeper than 15 percent
The BMP can only be located less than eight feet from
building foundations or an alternative setback.
A study prepared by a geotechnical professional or an
available watershed study substantiates that
stormwater infiltration would potentially result in
significantly increased risks of geotechnical hazards
that cannot be mitigated to an acceptable level.
X
See soils engineer approval for infiltration due to high groundwater in Attachment E.
3 Would infiltration of the DCV from drainage area violate
downstream water rights?
X
See soils engineer approval for infiltration due to high groundwater in Attachment E.
PA2021-024
Water Quality and Hydrology Plan (WQHP)
6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
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Table 2.7: Infiltration BMP Feasibility Worksheet (continued)
Partial Infeasibility Criteria Yes No
4
Is proposed infiltration facility located on HSG D soils or the
site geotechnical investigation identifies presence of soil
characteristics which support categorization as D soils?
X
Per the O.C. Hydrology Manual Plate B, the project is underlain by soil Type A. Per the O.C.
Hydrology manual, Soil Type A have high infiltration rates.
5
Is measured infiltration rate below proposed facility less
than 0.3 inches per hour? This calculation shall be based
on the methods described in Appendix VII.
X
Per the O.C. Hydrology Manual Plate B, the project is underlain by soil Type A. Per the O.C.
Hydrology manual, Soil Type A have high infiltration rates.
6
Would reduction of over predeveloped conditions cause
impairments to downstream beneficial uses, such as
change of seasonality of ephemeral washes or increased
discharge of contaminated groundwater to surface
waters?
X
See soils engineer approval for infiltration due to high groundwater in Attachment E.
7
Would an increase in infiltration over predeveloped
conditions cause impairments to downstream beneficial
uses, such as change of seasonality of ephemeral washes
or increased discharge of contaminated groundwater to
surface waters?
X
See soils engineer approval for infiltration due to high groundwater in Attachment E.
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IV.3.3 Evapotranspiration, Rainwater Harvesting BMPs
Name Included?
All HSCs; See Section IV.3.1
Surface-based infiltration BMPs
Biotreatment BMPs
Above-ground cisterns and basins
Underground detention
Other:
Other:
Other:
The project site does not have an irrigation demand large enough to justify partial capture for irrigation
demand. See Worksheet J from Section X of the TGD on the following page.
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Worksheet J: Summary of Harvested Water Demand and Feasibility
1 What demands for harvested water exist in the tributary area (check all that apply):
2 Toilet and urinal flushing □
3 Landscape irrigation □
4 Other: _ _ _ □
5 What is the design capture storm depth? (Figure III.1) d 0.7 inches
6 What is the project size? A 0.052 ac
7 What is the acreage of impervious area? IA 0.052 ac
For projects with multiple types of demand (toilet flushing, irrigation demand, and/or other demand)
8 What is the minimum use required for partial capture? (Table X.6) gpd
9 What is the project estimated wet season total daily use (Section
X.2)?
gpd
10 Is partial capture potentially feasible? (Line 9 > Line 8?)
For projects with only toilet flushing demand
11 What is the minimum TUTIA for partial capture? (Table X.7)
12 What is the project estimated TUTIA?
13 Is partial capture potentially feasible? (Line 12 > Line 11?)
For projects with only irrigation demand
14 What is the minimum irrigation area required based on
conservation landscape design? (Table X.8) 0.84 x 0.052 = 0.044 ac
15 What is the proposed project irrigated area? (multiply
conservation landscaping by 1; multiply active turf by 2) 0.0 ac
16 Is partial capture potentially feasible? (Line 15 > Line 14?) No
Provide supporting assumptions and citations for controlling demand calculation:
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IV.3.4 Biotreatment BMPs
Name Included?
Bioretention with underdrains
Stormwater planter boxes with underdrains
Rain gardens with underdrains
Constructed wetlands
Vegetated swales
Vegetated filter strips
Proprietary vegetated biotreatment systems
Wet extended detention basin
Dry extended detention basins
Other:
The entire DCV is treated/retained via an infiltration trench.
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IV.3.5 Hydromodification Control BMPs
Hydromodification Control BMPs
BMP Name BMP Description
N/A As shown in Section II.3 of this report, HCOCs do not exist for
this project.
IV.3.6 Regional/Sub-Regional LID BMPs
Regional/Sub-Regional LID BMPs
N/A - This project will not participate in any Regional or Sub-Regional LID BMPs
IV.3.7 Treatment Control BMPs
Treatment Control BMPs
BMP Name BMP Description
N/A Treatment Control BMPs are not required for this project.
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IV.3.8 Non-structural Source Control BMPs
Fill out non-structural source control check box forms or provide a brief narrative explaining if non-
structural source controls were not used.
Non-Structural Source Control BMPs
Identifier Name
Check One If not applicable, state brief
reason Included Not
Applicable
N1 Education for Property Owners,
Tenants and Occupants
N2 Activity Restrictions
N3 Common Area Landscape
Management
N4 BMP Maintenance
N5 Title 22 CCR Compliance (How
development will comply) N/A; residential construction
N6 Local Industrial Permit Compliance N/A; residential construction
N7 Spill Contingency Plan N/A; residential construction
N8 Underground Storage Tank
Compliance No underground storage tanks.
N9 Hazardous Materials Disclosure
Compliance No bulk storage of hazardous
materials
N10 Uniform Fire Code Implementation No bulk storage of hazardous
materials
N11 Common Area Litter Control N/A; residential construction
N12 Employee Training N/A; residential construction
N13 Housekeeping of Loading Docks No loading docks present
N14 Common Area Catch Basin Inspection Covered under N3 for SFR.
N15 Street Sweeping Private Streets and
Parking Lots Street sweeping performed by
City of Newport Beach.
N16 Retail Gasoline Outlets N/A to this development.
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···············································································[8]···············0····················································
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□ ......................................................................... ······o······· ········C8l········ ........................................... .
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N1 – Education: The Owner must understand purpose of all BMPs and how they work. The
contractor who installs the BMP shall educate the owner and the owner shall share the
information with any maintenance personnel. Additionally, the owner shall keep a copy
of this WQHP, as well as the Operations and Maintenance Plan. Practical information
materials shall be provided to the first residents /occupants/tenants on general
housekeeping practices that contribute to the protection of stormwater quality. These
materials will be initially developed and provided to first residents/occupants/tenants by
the developer.
N2 – Activity Restrictions: The following actions are prohibited on the project site: (1) car
washing on any portion of the property, (2) disposal of solid waste on the property except
in designated trash areas, (3) disposal of liquid waste into any solid waste container, (4)
placement of hazardous waste in any solid waste container. Any activities that would
violate the City of Newport Beach Water Quality Ordinance (Municipal Code Chapter
14.36).
N3 – Common Area Landscape Management: The Owner shall keep garden areas clean,
planted, and weed free. The Owner shall verify that landscape activities are consistent
with those in the County Water Conservation Resolution (or city equivalent) that include
fertilizer and/or pesticide usage consistent with Management Guidelines for Use of
Fertilizers (DAMP Section 5.5).
N4 – BMP Maintenance: The owner shall be responsible for each non-structural BMP and
scheduled cleaning and/or maintenance of all structural BMP facilities. Visual inspection
shall be performed by the owner or contracted personnel. More thorough inspection
should be required if ponding water sits for more than 48 hours
PA2021-024
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6806 West Oceanfront, Newport Beach, CA
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IV.3.9 Structural Source Control BMPs
Fill out structural source control check box forms or provide a brief narrative explaining if
Structural source controls were not used.
Structural Source Control BMPs
Identifier Name
Check One If not applicable, state brief
reason Included Not
Applicable
S1 Provide storm drain system stenciling
and signage There is no inlet proposed on
private property.
S2
Design and construct outdoor material
storage areas to reduce pollution
introduction
No outdoor material storage areas
S3
Design and construct trash and waste
storage areas to reduce pollution
introduction
S4
Use efficient irrigation systems &
landscape design, water conservation,
smart controllers, and source control
No landscape area
S5 Protect slopes and channels and
provide energy dissipation There are no significant on-site
slopes requiring protection.
Incorporate requirements applicable to
individual priority project categories
(from SDRWQCB NPDES Permit)
S6 Dock areas No dock areas.
S7 Maintenance bays No maintenance bays
S8 Vehicle wash areas No designated vehicle wash areas
S9 Outdoor processing areas No outdoor processing areas.
S10 Equipment wash areas No designated equipment wash
areas.
S11 Fueling areas No onsite fueling areas.
S12 Hillside landscaping No onsite hillside areas.
S13 Wash water control for food
preparation areas No outdoor food preparation
areas.
S14 Community car wash racks N/A; residential development
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S3 – Trash Enclosures: The Owner shall keep trash storage areas clean and orderly to reduce
pollutant introduction. All trash container areas shall be paved with an impervious surface,
designed not to allow run-on, screened or walled to prevent off-site transport of trash, and
be provided with a roof or awning to prevent direct precipitation.
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IV.4 ALTERNATIVE COMPLIANCE PLAN (IF APPLICABLE)
IV.4.1 Water Quality Credits
Determine if water quality credits are applicable for the project.
Description of Proposed Project
Project Types that Qualify for Water Quality Credits (Select all that apply):
Redevelopment
projects that reduce the
overall impervious
footprint of the project
site.
Brownfield redevelopment, meaning
redevelopment, expansion, or reuse of real
property which may be complicated by the
presence or potential presence of hazardous
substances, pollutants or contaminants, and
which have the potential to contribute to
adverse ground or surface WQ if not
redeveloped.
Higher density development projects which
include two distinct categories (credits can only
be taken for one category): those with more than
seven units per acre of development (lower credit
allowance); vertical density developments, for
example, those with a Floor to Area Ratio (FAR)
of 2 or those having more than 18 units per acre
(greater credit allowance).
Mixed use development, such as a
combination of residential, commercial,
industrial, office, institutional, or other land
uses which incorporate design principles
that can demonstrate environmental benefits
that would not be realized through single
use projects (e.g. reduced vehicle trip traffic
with the potential to reduce sources of water
or air pollution).
Transit-oriented developments, such as a mixed
use residential or commercial area designed to
maximize access to public transportation; similar to
above criterion, but where the development center is
within one half mile of a mass transit center (e.g. bus,
rail, light rail or commuter train station). Such
projects would not be able to take credit for both
categories, but may have greater credit assigned
Redevelopment
projects in an established
historic district, historic
preservation area, or
similar significant city
area including core City
Center areas (to be
defined through
mapping).
Developments with
dedication of undeveloped
portions to parks,
preservation areas and
other pervious uses.
Developments
in a city center
area.
Developments
in historic
districts or
historic
preservation
areas.
Live-work developments, a
variety of developments designed
to support residential and
vocational needs together –
similar to criteria to mixed use
development; would not be able
to take credit for both categories.
In-fill projects, the
conversion of empty lots
and other underused
spaces into more
beneficially used spaces,
such as residential or
commercial areas.
Calculation of
Water Quality
Credits
(if applicable)
Water Quality Credits are not applicable to this two-unit residential development.
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IV.4.2 Alternative Compliance Plan Information
Describe an alternative compliance plan (if applicable). Include alternative compliance obligations
(i.e., gallons, pounds) and describe proposed alternative compliance measures.
An Alternative Compliance Plan is not needed for this development, where the water quality design volume has
been met using Hydrologic Source Control BMPs.
PA2021-024
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Section V Inspection/Maintenance
Responsibility for BMPs
Prepare and attach an Operation and Maintenance Plan. Identify the mechanism through which
BMPs will be maintained. Inspection and maintenance records must be kept for a minimum of five
years for inspection by the regulatory agencies.
See ATTACHMENT “A” of this WQMP.
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Section VI Site Plan and Drainage Plan
VI.1 SITE PLAN AND DRAINAGE PLAN
Include a site plan and drainage plan sheet containing the following minimum information:
• Project location
• Site boundary
• Land uses and land covers, as applicable
• Suitability/feasibility constraints
• Structural BMP locations
• Drainage delineations and flow information
• Drainage connections
• BMP details
PA2021-024
ALLEYFD. L&TRCE 24668FD. L&TLS 6921FD. L&TLS6921RESIDENCE
RESIDENCERESIDENCE
RESIDENCEOCEAN FRONTPROPOSED RESIDENCEFF=14.50GARAGE139 Avenida NavarroSan Clemente, CA 92672949.492.8586www.toalengineering.comCIVIL ENGINEERINGLAND SURVEYINGSTORMWATER QUALITYWQMP LEGENDPROPOSED HARDSCAPE AREAPROPOSED BUILDING ADDITIONRUNOFF FLOW DIRECTIONPROJECT AREA BOUNDARYPROPOSED INFILTRATION BMPDMA TABLEDETAILINFILTRATION TRENCHPA2021-024
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6806 West Oceanfront, Newport Beach, CA
NORTON RESIDENCE
21002-wqhp-body Page 32
Section VII Educational Materials
Refer to the Orange County Stormwater Program (ocwatersheds.com) for a library of materials
available. For the copy submitted to the Permittee, only attach the educational materials specifically
applicable to the project. Other materials specific to the project may be included as well and must
be attached.
Education Materials
Residential Material
(http://www.ocwatersheds.com)
Check If
Applicable
Business Material
(http://www.ocwatersheds.com)
Check If
Applicable
The Ocean Begins at Your Front Door Tips for the Automotive Industry
Tips for Car Wash Fund-raisers Tips for Using Concrete and Mortar
Tips for the Home Mechanic Tips for the Food Service Industry
Homeowners Guide for Sustainable
Water Use Proper Maintenance Practices for Your
Business
Household Tips
Other Material Check If
Attached Proper Disposal of Household
Hazardous Waste
Recycle at Your Local Used Oil
Collection Center (North County) R-4 Home and Garden Care Activities
Recycle at Your Local Used Oil
Collection Center (Central County)
Recycle at Your Local Used Oil
Collection Center (South County)
Tips for Maintaining a Septic Tank System
Responsible Pest Control
Sewer Spill
Tips for the Home Improvement Projects
Tips for Horse Care
Tips for Landscaping and Gardening
Tips for Pet Care
Tips for Pool Maintenance
Tips for Residential Pool, Landscape and
Hardscape Drains
Tips for Projects Using Paint
PA2021-024
ATTACHMENT A
BMP Fact Sheet
PA2021-024
TECHNICAL GUIDANCE DOCUMENT APPENDICES
XIV-5 December 20, 2013
HSC-2: Impervious Area Dispersion
Impervious area dispersion refers to the practice of routing
runoff from impervious areas, such as rooftops, walkways,
and patios onto the surface of adjacent pervious areas.
Runoff is dispersed uniformly via splash block or dispersion
trench and soaks into the ground as it move slowly across the
surface of pervious areas. Minor ponding may occur, but it is
not the intent of this practice to actively promote localized
on-lot storage (See HSC-1: Localized On-Lot Infiltration).
Feasibility Screening Considerations
Impervious area dispersion can be used where infiltration
would otherwise be infeasible, however dispersion depth
over landscaped areas should be limited by site-specific
conditions to prevent standing water or geotechnical issues.
Opportunity Criteria
Rooftops and other low traffic impervious surface present in
drainage area.
Soils are adequate for infiltration. If not, soils can be
amended to improve capacity to absorb dispersed water
(see MISC-2: Amended Soils).
Significant pervious area present in drainage area with shallow slope
Overflow from pervious area can be safely managed.
OC-Specific Design Criteria and Considerations
□ Soils should be preserved from their natural condition or restored via soil amendments to meet
minimum criteria described in Section .
□ A minimum of 1 part pervious area capable of receiving flow should be provided for every 2
parts of impervious area disconnected.
□
The pervious area receiving flow should have a slope ≤ 2 percent and path lengths of ≥ 20 feet
per 1000 sf of impervious area.
□ Dispersion areas should be maintained to remove trash and debris, loose vegetation, and
protect any areas of bare soil from erosion.
□ Velocity of dispersed flow should not be greater than 0.5 ft per second to avoid scour.
Calculating HSC Retention Volume
The retention volume provided by downspout dispersion is a function of the ratio of impervious to
pervious area and the condition of soils in the pervious area.
Determine flow patterns in pervious area and estimate footprint of pervious area receiving
dispersed flow. Calculate the ratio of pervious to impervious area.
Check soil conditions using the soil condition design criteria below; amend if necessary.
Look up the storm retention depth, dHSC from the chart below.
Simple Downspout Dispersion
Source:
toronto.ca/environment/water.htm
Also known as:
Downspout disconnection
Impervious area
disconnection
Sheet flow dispersion
PA2021-024
TECHNICAL GUIDANCE DOCUMENT APPENDICES
XIV-6 December 20, 2013
The max dHSC is equal to the design storm
depth for the project site.
Soil Condition Design Criteria
□ Maximum slope of 2 percent
□ Well-established lawn or landscaping
□ Minimum soil amendments per criteria in
MISC-2: Amended Soils.
Configuration for Use in a Treatment Train
Impervious area disconnection is an HSC
that may be used as the first element in
any treatment train
The use of impervious area disconnection
reduces the sizing requirement for
downstream LID and/or treatment control
BMPs
Additional References for Design Guidance
SMC LID Manual (pp 131)
http://www.lowimpactdevelopment.org/guest75/pub/All_Projects/SoCal_LID_Manual/SoCalL
ID_Manual_FINAL_040910.pdf
City of Portland Bureau of Environmental Services. 2010. How to manage stormwater –
Disconnect Downspouts. http://www.portlandonline.com/bes/index.cfm?c=43081&a=177702
Seattle Public Utility:
http://www.cityofseattle.org/util/stellent/groups/public/@spu/@usm/documents/webcontent/sp
u01_006395.pdf
Thurston County, Washington State (pp 10):
http://www.co.thurston.wa.us/stormwater/manual/docs-faqs/DG-5-Roof-Runoff-
Control_Rev11Jan24.pdf
1 Pervious area used in calculation should
only include the pervious area receiving
flow, not pervious area receiving only direct
rainfall or upslope pervious drainage.
PA2021-024
TECHNICAL GUIDANCE DOCUMENT APPENDICES
XIV-50 December 20, 2013
XIV.5. Biotreatment BMP Fact Sheets (BIO)
Conceptual criteria for biotreatment BMP selection, design, and maintenance are contained in
Appendix XII. These criteria are generally applicable to the design of biotreatment BMPs in
Orange County and BMP-specific guidance is provided in the following fact sheets. 24
Note: Biotreatment BMPs shall be designed to provide the maximum feasible infiltration and ET based on
criteria contained in Appendix XI.2.
BIO-1: Bioretention with Underdrains
Bioretention stormwater treatment facilities are landscaped
shallow depressions that capture and filter stormwater
runoff. These facilities function as a soil and plant-based
filtration device that removes pollutants through a variety of
physical, biological, and chemical treatment processes. The
facilities normally consist of a ponding area, mulch layer,
planting soils, and plants. As stormwater passes down
through the planting soil, pollutants are filtered, adsorbed,
biodegraded, and sequestered by the soil and plants.
Bioretention with an underdrain are utilized for areas with
low permeability native soils or steep slopes where the
underdrain system that routes the treated runoff to the storm
drain system rather than depending entirely on infiltration.
Bioretention must be designed without an underdrain in areas of
high soil permeability.
Feasibility Screening Considerations
x If there are no hazards associated with infiltration (such as groundwater concerns, contaminant
plumes or geotechnical concerns), bioinfiltration facilities, which achieve partial infiltration,
should be used to maximize infiltration.
24 Not all BMPs presented in this section are considered “biofiltration BMPs” under the South Orange County
Permit Area. Biofiltration BMPs are vegetated treat-and-release BMPs that filter stormwater through amended soil
media that is biologically active, support plant growth, and also promote infiltration and/or evapotranspiration. For
projects in South Orange County, the total volume of storage in surface ponding and pores spaces is required to be at
least 75% of the remaining DCV that the biofiltration BMP is designed to address. This prevents significant down-
sizing of BMPs which otherwise may be possible via routing calculations. Biotreatment BMPs that do not meet this
definition are not considered to be LID BMPs, but may be used as treatment control or pre-treatment BMPs. See
Section III.7 and Worksheet SOC-1 for guidance.
Also known as:
¾Rain gardens with
underdrains
¾Vegetated media filter
¾Downspout planter boxes
Bioretention
Source: Geosyntec Consultants
PA2021-024
TECHNICAL GUIDANCE DOCUMENT APPENDICES
XIV-51 December 20, 2013
x Bioretention with underdrain facilities should be lined if contaminant plumes or geotechnical
concerns exist. If high groundwater is the reason for infiltration infeasibility, bioretention facilities
with underdrains do not need to be lined.
Opportunity Criteria
x Land use may include commercial, residential, mixed use, institutional, and subdivisions.
Bioretention may also be applied in parking lot islands, cul-de-sacs, traffic circles, road shoulders,
road medians, and next to buildings in planter boxes.
x Drainage area is ≤ 5 acres.
x Area is available for infiltration.
x Site must have adequate relief between land surface and the stormwater conveyance system to
permit vertical percolation through the soil media and collection and conveyance in underdrain to
stormwater conveyance system.
OC-Specific Design Criteria and Considerations
□ Ponding depth should not exceed 18 inches; fencing may be required if ponding depth is
greater than 6 inches to mitigate drowning.
□ The minimum soil depth is 2 feet (3 feet is preferred).
□ The maximum drawdown time of the bioretention ponding area is 48 hours. The maximum
drawdown time of the planting media and gravel drainage layer is 96 hours, if applicable.
□
Infiltration pathways may need to be restricted due to the close proximity of roads, foundations,
or other infrastructure. A geomembrane liner, or other equivalent water proofing, may be placed
along the vertical walls to reduce lateral flows. This liner should have a minimum thickness of
30 mils.
□ If infiltration in bioretention location is hazardous due to groundwater or geotechnical concerns,
a geomembrane liner must be installed at the base of the bioretention facility. This liner should
have a minimum thickness of 30 mils.
□ The planting media placed in the cell shall be designed per the recommendations contained in
MISC-1: Planting/Storage Media
□ Plant materials should be tolerant of summer drought, ponding fluctuations, and saturated soil
conditions for 48 hours; native place species and/or hardy cultivars that are not invasive and do
not require chemical inputs should be used to the maximum extent feasible
□ The bioretention area should be covered with 2-4 inches (average 3 inches) or mulch at the
start and an additional placement of 1-2 inches of mulch should be added annually.
□ Underdrain should be sized with a 6 inch minimum diameter and have a 0.5% minimum slope.
Underdrain should be slotted polyvinyl chloride (PVC) pipe; underdrain pipe should be more
than 5 feet from tree locations (if space allows).
□ A gravel blanket or bedding is required for the underdrain pipe(s). At least 0.5 feet of washed
aggregate must be placed below, to the top, and to the sides of the underdrain pipe(s).
□ An overflow device is required at the top of the bioretention area ponding depth.
□ Dispersed flow or energy dissipation (i.e. splash rocks) for piped inlets should be provided at
basin inlet to prevent erosion.
□ Ponding area side slopes shall be no steeper than 3:1 (H:V) unless designed as a planter box
BMP with appropriate consideration for trip and fall hazards.
PA2021-024
TECHNICAL GUIDANCE DOCUMENT APPENDICES
XIV-52 December 20, 2013
Simple Sizing Method for Bioretention with Underdrain
If the Simple Design Capture Volume Sizing Method described in Appendix III.3.1 is used to size a
bioretention with underdrain facility, the user selects the basin depth and then determines the appropriate
surface area to capture the DCV. The sizing steps are as follows:
Step 1: Determine DCV
Calculate the DCV using the Simple Design Capture Volume Sizing Method described in Appendix
III.3.1.
Step 2: Verify that the Ponding Depth will Draw Down within 48 Hours
The ponding area drawdown time can be calculated using the following equation:
DDP = (dP / KMEDIA) × 12 in/ft
Where:
DDP = time to drain ponded water, hours
dP = depth of ponding above bioretention area, ft (not to exceed 1.5 ft)
KMEDIA = media design infiltration rate, in/hr (equivalent to the media hydraulic conductivity with a
factor of safety of 2; KMEDIA of 2.5 in/hr should be used unless other information is available)
If the drawdown time exceeds 48 hours, adjust ponding depth and/or media infiltration rate until 48
hour drawdown time is achieved.
Step 3: Determine the Depth of Water Filtered During Design Capture Storm
The depth of water filtered during the design capture storm can be estimated as the amount routed
through the media during the storm, or the ponding depth, whichever is smaller.
dFILTERED = Minimum [ ((KMEDIA × TROUTING)/12), dP]
Where:
dFILTERED = depth of water that may be considered to be filtered during the design storm event, ft
KMEDIA = media design infiltration rate, in/hr (equivalent to the media hydraulic conductivity with a
factor of safety of 2; KMEDIA of 2.5 in/hr should be used unless other information is available)
TROUTING = storm duration that may be assumed for routing calculations; this should be assumed to be
no greater than 3 hours. If the designer desires to account for further routing effects, the Capture
Efficiency Method for Volume-Based, Constant Drawdown BMPs (See Appendix III.3.2) should be
used.
dP = depth of ponding above bioretention area, ft (not to exceed 1.5 ft)
Step 4: Determine the Facility Surface Area
A = DCV/ (dP + dFILTERED)
Where:
A = required area of bioretention facility, sq-ft
DCV = design capture volume, cu-ft
dFILTERED = depth of water that may be considered to be filtered during the design storm event, ft
dP = depth of ponding above bioretention area, ft (not to exceed 1.5 ft)
In South Orange County, the provided ponding plus pore volume must be checked to demonstrate that it
is greater than 0.75 of the remaining DCV that this BMP is designed to address. See Section III.7 and
Worksheet SOC-1.
PA2021-024
TECHNICAL GUIDANCE DOCUMENT APPENDICES
XIV-53 December 20, 2013
Capture Efficiency Method for Bioretention with Underdrains
If the bioretention geometry has already been defined and the user wishes to account more explicitly for
routing, the user can determine the required footprint area using the Capture Efficiency Method for
Volume-Based, Constant Drawdown BMPs (See Appendix III.3.2) to determine the fraction of the DCV
that must be provided to manage 80 percent of average annual runoff volume. This method accounts for
drawdown time different than 48 hours.
Step 1: Determine the drawdown time associated with the selected basin geometry
DD = (dp / KDESIGN) × 12 in/ft
Where:
DD = time to completely drain infiltration basin ponding depth, hours
dP = bioretention ponding depth, ft (should be less than or equal to 1.5 ft)
KDESIGN = design media infiltration rate, in/hr (assume 2.5 inches per hour unless otherwise proposed)
If drawdown is less than 3 hours, the drawdown time should be rounded to 3 hours or the Capture
Efficiency Method for Flow-based BMPs (See Appendix III.3.3) shall be used.
Step 2: Determine the Required Adjusted DCV for this Drawdown Time
Use the Capture Efficiency Method for Volume-Based, Constant Drawdown BMPs (See Appendix III.3.2)
to calculate the fraction of the DCV the basin must hold to achieve 80 percent capture of average annual
stormwater runoff volume based on the basin drawdown time calculated above.
Step 3: Determine the Basin Infiltrating Area Needed
The required infiltrating area (i.e. the surface area of the top of the media layer) can be calculated using
the following equation:
A = Design Volume / dp
Where:
A = required infiltrating area, sq-ft (measured at the media surface)
Design Volume = fraction of DCV, adjusted for drawdown, cu-ft (see Step 2)
dp = ponding depth of water stored in bioretention area, ft (from Step 1)
This does not include the side slopes, access roads, etc. which would increase bioretention footprint. If
the area required is greater than the selected basin area, adjust surface area or adjust ponding depth and
recalculate required area until the required area is achieved.
In South Orange County, the provided ponding plus pore volume must be checked to demonstrate that it
is greater than 0.75 of the remaining DCV that this BMP is designed to address. See Section III.7 and
Worksheet SOC-1.
Configuration for Use in a Treatment Train
x Bioretention areas may be preceeded in a treatment train by HSCs in the drainage area, which
would reduce the required design volume of the bioretention cell. For example, bioretention could
be used to manage overflow from a cistern.
x Bioretention areas can be used to provide pretreatment for underground infiltration systems.
Additional References for Design Guidance
x CASQA BMP Handbook for New and Redevelopment:
http://www.cabmphandbooks.com/Documents/Development/TC-32.pdf
PA2021-024
TECHNICAL GUIDANCE DOCUMENT APPENDICES
XIV-54 December 20, 2013
x SMC LID Manual (pp 68):
http://www.lowimpactdevelopment.org/guest75/pub/All_Projects/SoCal_LID_Manual/SoCalL
ID_Manual_FINAL_040910.pdf
x Los Angeles County Stormwater BMP Design and Maintenance Manual, Chapter 5:
http://dpw.lacounty.gov/DES/design_manuals/StormwaterBMPDesignandMaintenance.pdf
x San Diego County LID Handbook Appendix 4 (Factsheet 7):
http://www.sdcounty.ca.gov/dplu/docs/LID-Appendices.pdf
Los Angeles Unified School District (LAUSD) Stormwater Technical Manual, Chapter 4:
http://www.laschools.org/employee/design/fs-studies-and-
reports/download/white_paper_report_material/Storm_Water_Technical_Manual_2009-opt-
red.pdf?version_id=76975850
x County of Los Angeles Low Impact Development Standards Manual, Chapter 5:
http://dpw.lacounty.gov/wmd/LA_County_LID_Manual.pdf
PA2021-024
ATTACHMENT B
PA2021-024
Did You Know?
■ ~Ion people bcliC\'C that the largest source
of,,-.. ucr pollution in urban areas comes rrom
SJJt·cific sources !!olldl as factu1ll's .and st•W'dgt·
trcauucnt planlS. In fact, Lhc largest source
of water pollution comes from city st.reelS,
neighborhoods, construction sites and parking
lot.s. This type ofpollu1ion is sometimes
called "non•poim .source" polhnion.
■There are two types of non-point source
pollmion: stormw-ater and urban runoff
pollmion.
■Stonnwatcr nmoIT rcsuhs from rainfall.
When rainstom1s cause large \'Olumcs
of water to 1insc the urban landscape.
picking up pollu:ants along 1.he way.
■Urban runoff can happen any time of
the year when cxccssh·c water use from
irrigation, vehicle washing and 01her
sources carries 1rash, lawn clippings and
other urban pollur.anu into 5tonn drains.
Where Does It Go?
■Anything we uie out11ide home!, vebjcle! and
businesses -like motor oil, paint, pesticides,
fertilizers and cleaners -can be blown or washed
into stonn drains.
■A little w:ater from a garden hose or rain can also
send mat.criah into .nonn drains.
■Stonn drains arc separate fmrn our sanitary
sewer !)'SleJru; unlike water in sanitary sewers
(from sinks or toilcu)i water in storm drains is
not treated before eni.eri.ng our waten\"3.)"S.
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Sources of No11-Poi11t Sow·ce Pollution
■Automoth·e leaks and spills.
■ Improper disposal of used oil ;md other engine
Ouids.
■ Metals found in \'Chicle exhaust, weathered paim,
nist, metal plating and tires.
■ Pesticides and fertilizers from lawns. gardc1ls a11d
famlS.
■ Improper disposal of cleaners, paint and paint
rcmo"crs.
■Soil erosion and chm debris from landscape and
constn1ction activities.
■ Liner, lawn clippinE,rs, animal waste. and other
organic matter.
■Oil stains on parking lots and paved s11rfaces.
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p;tlt).t:, fflf anuSoJJ J::r!~CUJClS Altmo:) :lilllll'JO :1iu,
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The Effect on. the Ocean
Non-point source
pollution can ha.·c
a serious impact
on water quality
in Orange County.
Pollur.ant.s from Lhe ____ <_, __ _.J storm drain S}'Jtem
can harm marine life
as well as c:oa.nal and wetland habitats. They can
also degradr. recreation areas .such aJ beaches,
harbors and bays.
Stormwater quality management programs ha\'e
been de\·eloped throughout Orange County to
educate and encourage the public to protect water
quality, monitor runoff in the storm drain ~'Stem,
inw,,tigaie illegal dumping and maintain stonn
druins.
Support from Orange County re!ident., and
bwinesses i! needed to imprm•e water quality
and reduce urban runoffpollucion. Proper use
and di,po,al of material, will help <top pollution
before it reache! the ~tonn drain and the ocean.
-
~ -. -----~. -_ .. -._,., ·-. -. ,-
PA2021-024
FolJow these simplcslcps to help reduce water
pollution:
Household Activities
■ Do not rinse spills with water. Use dry cleanup
methods such as applying cat liner or another
absorbcm material, sweep and dispose of in
the trash. Take iu:ms such as used or excess
baucrics, oven cleaners, automotive nuids,
painting producu and cathode ra)' IUbcs, like
TVs and compu1ei· monito1-s, to a J louschold
Ha,ardous Waste Collec,ion Center ( 111 IWCC).
■For a III IWCC near )'OU call (7141 83+-6752 o,·
visi1 ww,,.ocla,1dfiils.coo1.
■ Oo not hose clown your dri\'cway, sidewalk or
patio 10 1hc s1rec1, gutter or storm drain. Sweep
up debris and dispose ofiL in the LraSh.
Automotive
■·lake your vchiclelO a commctcial car
,'lash ,vhcnever-p<>Ssiblc. lryou ,va3h your
\'Chicle at home, <hoosc soaps, cleaners, or
dctcrgems labeled norHox.ic, phosphat<. ... free
or biodegradable. Vegetable and citrus•bascd
products arc typically safest for the environment.
■ Do not allow washwatcr from vehicle washing
to drain inlO 1hc street, guucr or stonn dr.1in.
Excess washw·a1crshould be disposed ofin the
sanitary se,•:cr (through a sink or toilet) or-onto
an absorbent surface like your lawn.
■Monitor your vehicles for leaks and place a pan
under leaks. Keep your vehicles well maintained
to stop and prevent leaks.
■ Never pour oil or anti.freeze in the street, gutter-
or storm drain. Recycle these substances at a
service statioo, a waste oil collection center-or
used oil rcqdii"'lgcemcr. 1-.. or the nearest Used
Oil Collcc,ion Center call 1-800.CLEA:--IL'l' or
visit Mn-.,.1800dc;.inup.org.
Pool Mai11te11a11ce
■ Pool and spa water must be dechlorinated and free
of excess acid, alkali or color to be allowed in the
street, guuer or stor'lll drain.
■When 11 is not raining, drain dechlorinated pool and
spa water directly into the
sanitary sewer.
■Some cities may ha,·e ordinances that do 1101 allow
pool \\later to be disposed or in the stonn drain.
Check ,,ith your city.
Landscape and Garde11i11g
■ Do not over-water. Water your lawn and garden by
hand to control the amount of water you use or set
irriga1ion srstems to rdlec1 seasonal ,v-,11c1 needs.
If ,vatc1· nows off yout yard onto you1 driveway 01
sidewalk. your system is ovcM,,.ucring. Pc,iodically
in:spcc1 cmd fi;\. kal,..,, .:md 1oi.:idi1cuc-d :sp1iu1Jcu.
■ Do not rake or blow lca"es, clippings or pruning
wasLc into the street, guucr or Slonn drai11. hutead.
dispose of wasLc by compoSLi1lg, hauling it to a
pc1111itu•d lan<lfill, or as 1-!r,•c·n wa!t1c~ 1hrn11gh ynm
city"s recycling program.
■ follow directions on pesticides and fertilizer,
(measure, do not estimate amounts) ;md do not use
if rain is predicted within 48 hours.
■Take unwamed pesticides to a l·ll lWCC to be
rec)'clccl. For locations and hours of 1-1 HWCC, call
(714) 8346752 or visit ww,\.ocla11clfills.corn.
Trash
■Place trash and liner that cannot be recycled in
securel)' covered lrash cans.
■Whenever possible, buy recycled products.
■ Remember: Reduce, Reuse, ReC)'clc.
Pet Care
■Ah,m)'S pick up after your pet. Flush waste down
the toilet or dispose ofiL in the 1rash. Pct waste,
if left outdoors, can wash imo the street, gutter
or stonn drain.
■If possible, bathe )'Our pets indoors. If you must
bathe your pct outside, wash ii on your lawn or
another absorbent/penneable .surface to keep
the wash water from emering the street, gutter or
storm drain.
■ Follow dircclions for use of pct. care products
and di.spo5~ of any um15ed producu at a
I-II-IWCC.
PA2021-024
For more informatio n,
please call the
Orange County Stormwater Program
a t 1-877-89-SPILL (1-877-897-7455)
or visit
www.ocwatersheds.com
To Report Illegal Dumping of
Household Hazardous Waste
call 1-800-69-TOXIC
To report a spill,
call the
Orange County 24-Hour
Water Pollution Problem
Reporting Hotline
1-877-89-SPILL (1-877-897-7455).
For emergencies, dial 911.
' RCCYCLE
USED O il.
()
P1i11tcd on Recycled Paper
'our .t'ront Uoor
PROJECT
Po33wt,on
PREVENTION
PA2021-024
Leftover household products that contain
corrosive, toxic, ignitable, or reactive
ivt 1/:A ' POSS/BU~.
l !Sf:'
.VO.V-1 l,\'/AR/)Ol IS
OU
1.r:ss-11'\ '/Jlf U JOl 1s
PRO/Jl '(,"IS.
ingredients are
considered to
be "household
hazardous waste"
or "HHW." HHW
can be found
throughout your
home, including the
bathroom, kitchen,
laundry room and
garage.
Disposal of HHW down the drain, on the
ground, into storm drains, or in the trash
is illegal and unsafe.
Proper disposal of HHW is actually easy.
Simply drop them off at a Household
Hazardous Waste Collection Center
(HHWCC) for free disposal and recycling.
Many materials including anti-freeze, latex-
based paint, motor oil and batteries can
be recycled. Some centers have a "Stop &
Swap" program that lets you take partially
used home, garden, and automobile
products free of charge. There are four
HHWCCs in Orange County:
Anaheim: .................. 1071 N. Blue Gum St
Huntington Beach: ......... 17121 Nichols St
Irvine: ............................ 6411 Oak Canyon
Sanjuan Capistrano: ... 32250 La Pata Ave
Centers are open Tuesday-Saturday, 9 a.m.-
3 p.m. Centers are closed on rainy days and
major holidays. For more information, call
(714) 834-6752 or visit www.oclandfills.com.
Common househoul hazardous
wastes
■ Batteries
■ Paint and paint products
■ Adhesives
■ Drain openers
■ Household cleaning products
■ Wood and metal cleaners and polishes
■ Pesticides
■ Fungicides/wood preservatives
■ Automotive products (antifreeze, motor
oil, fluids)
■ Grease and rust solvents
■ Fluorescent lamps
■ Mercury (th ermometers & thermostats)
■ All forms of electronic waste including
computers and microwaves
■ Pool & spa chemicals
■ Cleaners
■ Medications
■ Propane (camping & BBQ)
■ Mercury-containing lamps
■ Television & monitors (CRTs,
flatscreens)
Tips for household hazardous
waste
■ Never dispose of HHW in the trash,
street, gutter, storm drain or sewer.
■ Keep these materials in closed, labeled
containers and store materials indoors
or under a cover.
■ When possible, use non-hazardous
products.
■ Reuse products whenever possible or
share with family and friends.
■ Purchase only as much of a product as
you'll need. Empty containers may be
disposed of in the trash.
■ HHW can be harmful to humans,
pets and the environment. Report
emergencies to 911.
PA2021-024
For more information,
please call the
Orange County Stormwater Program
at 1-877-89-SPILL (1-877-897-7455)
or visit
www.ocwatersheds.com
UCCE Master Gardener Hotline:
(714) 708-1646
To report a spill,
call the
Orange County 24-Hour
Water Pollution Problem
Reporting Hotline
1-877-89-SPILL (1-877-897-7455).
For emergencies, dial 9 11.
The tips contained in this brochure provide usefnl
information to help prevent water pollution
while landscaping or gardening. lf you have other
suggestions, please contact your city's stormwater
representatives or call the O range County
Stormwater Program .
• # .. ... ..,
Printed on Recycled Paper
at Your Front D
R O J I C
Po33tttio:
PA2021-024
Never allow gardening products or
polluted water to enter the street, gutter
or storm drain.
General Landscaping Tips
■ Protect stockpiles and materials from
wind and rain by storing them under
tarps or secured plastic sheeting.
■Prevent erosion of slopes by planting
fast-growing, dense ground covering
plants. These will shield and bind the
soil.
■Plant native vegetation
to reduce the amount
of water, fertilizers, and
pesticide applied to the
landscape.
■Never apply pesticides
or fertilizers when rain is --
predicted within the next 48 hours.
Garden & Lawn Maintenance
■Do not overwater. Use irrigation
practices such as drip irrigation,
soaker hoses or micro spray systems.
Periodically inspect and fix leaks and
misdirected sprinklers.
■ Do not rake or blow
leaves, clippings or
pruning waste into
the street, gutter
or storm drain.
Instead, dispose
of green waste by
composting, hauling
it to a permitted
landfill, or recycling it through your
city's program.
■ Use slow-release fertilizers to
minimize leaching, and use organic
fertilizers.
■ Read labels and use only as directed.
Do not over-apply pesticides or
fertilizers. Apply to spots as needed,
rather than blanketing an entire
area.
■ Store pesticides, fertilizers and other
chemicals in a dry covered area to
prevent exposure that may result
in the deterioration
of containers and
packaging.
■ Rinse empty
pesticide containers
and re-use rinse water
as you would use the
product. Do not dump rinse water
down storm d rains. Dispose of empty
containers in the trash.
■When available, use non-toxic
alternatives to traditional pesticides,
and use pesticides specifically
designed to control the pest you are
targeting. For more information, visit
www.ipm.ucdavis.edu.
■ If fertilizer is spilled, sweep up the
spill before irrigating. If the spill is
liquid, apply an absorbent material
such as cat litter, and then sweep it up
and dispose of it in the trash.
■ Take unwanted pesticides to a
Household Hazardous Waste
Collection Center to be recycled.
Locations are provided below.
PA2021-024
For more infor mation ,
please call the
Orange County Stormwater Program
at 1-877-89-SPILL (1-877-897-7455)
or visit
www.ocwatersheds.com
To report a spill,
call the
Orange County 24-Hour
Water Pollution Reporting Hotline
1-877-89-SPILL (1-877-897-7455).
For emergencies, dial 911.
The rips contained in this brochure provide useful
information to help prevent water pollution
while maintaining your pool. If you have other
suggestions, please contact your city's stormwater
representatives or call the Orange County
Stormwater Program.
rTlie Ocean Begins
at Your Front Door
PR o ,J E CT
PoJi~t,on
P R E V E N T-1 0 N
PA2021-024
Many pools are
plumbed to allow the
pool to drain directly
to the sanitary sewer.
If yours is not, follow
these instructions for
disposing of pool and
spa water.
Acceptable and Preferred
Method of Disposal
When you cannot dispose of pool water
in the sanitary sewer, the release of
dechlorinated swimming pool water is
allowed if all of these tips are followed:
■ The residual chlorine does not
exceed 0.1 mg/1 (parts per million).
■The pH is between 6.5 and 8.5.
■The water is free of any unusual
coloration, dirt or algae.
■ There is no discharge of filter media.
■There is no discharge of acid
cleaning wastes.
■ Some cities may have ordinances
that do not allow pool water to be
disposed into a storm drain. Check
with your city.
How to Know if You're
Following the Standards
You can find out how much chlorine
is in your water by using a pool testing
kit. Excess chlorine can be removed
by discontinuing the use of chlorine
for a few days prior to discharge
or by purchasing dechlorinating
chemicals from a local pool supply
company. Always make sure to follow
the instructions that come with any
products you use.
~~~~ * +-:"-·--""i-. --~1 . . . . __ • . J_ ·-
Doing Your Part
By complying with these guidelines,
you will make a significant contribution
toward keeping pollutants out of
Orange County's creeks, streams, rivers,
bays and the ocean. This helps to
protect organisms that are sensitive to
pool chemicals, and helps to maintain
the health of our environment.
Pll:OJl<T
Po~!ut,0 11
PRIVENTION
•◄◄
PA2021-024
ATTACHMENT C
PA2021-024
Source : Goolge Earth
site
PA2021-024
ATTACHMENT D
PA2021-024
Operations and Maintenance (O&M) Plan
for
Norton Residence
6806 West Oceanfront
Newport Beach, California 92663
APN 045-033-17
Overall Responsible Party/Owner:
Sean Norton
6806 West Oceanfront
Newport Beach, California 92663
(949)637-5220
PA2021-024
Exhibit B, Operations and Maintenance Plan BMP Applicable? Yes/No BMP Name and BMP Implementation, Maintenance and Inspection Procedures Implementation, Maintenance, and Inspection Frequency and Schedule Person or Entity with Operation & Maintenance Responsibility Non-Structural Source Control BMPs Yes N1. Education for Property Owners, Tenants and Occupants Practical information materials will be provided to the first residents/occupants/tenants on general housekeeping practices that contribute to the protection of stormwater quality. These materials will be initially developed and provided to first residents/occupants/tenants by the developer. Owner shall keep up to date with BMP requirements, and be responsible for educating maintenance personnel; As required. Owner Yes N2. Activity Restrictions The following actions are prohibited on the project site: (1) car washing on any portion of the property, (2) disposal of solid waste on the property except in designated trash areas, (3) disposal of liquid waste into any solid waste container, (4) placement of hazardous waste in any solid waste container. Any activities that would violate the City of Newport Beach Water Quality Ordinance (Municipal Code Chapter 14.36). Owner Yes N3. Common Area Landscape Management Identify on-going landscape maintenance requirements that are consistent with those in the County Water Conservation Resolution (or city equivalent) that include fertilizer and/or pesticide usage consistent with Management Guidelines for Use of Fertilizers (DAMP Section 5.5). Statements regarding the specific applicable guidelines must be included in the project WQMP. Keep garden areas clean, planted, and weed free. Weekly. Owner or contracted maintenance personnel Yes N4. BMP Maintenance The project WQMP shall identify responsibility for implementation of each non-structural BMP and scheduled cleaning and/or maintenance of all structural BMP facilities. Visual Inspection, perform more thorough inspection if ponding water sits for more than 48 hours. Twice yearly and immediately following each storm event. Owner or contracted maintenance personnel No N5. Title 22 CCR Compliance PA2021-024
Exhibit B, Operations and Maintenance Plan Page 2 of 10 BMP Applicable? Yes/No BMP Name and BMP Implementation, Maintenance and Inspection Procedures Implementation, Maintenance, and Inspection Frequency and Schedule Person or Entity with Operation & Maintenance Responsibility No N6. Local Water Quality Permit Compliance No N7. Spill Contingency Plan No N8. Underground Storage Tank Compliance No N9. Hazardous Materials Disclosure Compliance No N10. Uniform Fire Code Implementation No N11. Common Area Litter Control No N12. Employee Training No N13. Housekeeping of Loading Docks No N14. Common Area Catch Basin Inspection No N15. Street Sweeping Private Streets and Parking Lots Structural Source Control BMPs No S1. Provide Storm Drain System Stenciling and Signage No S2. Design Outdoor Hazardous Material Storage Areas to Reduce Pollutant Introduction Yes S3. Design Trash Enclosures to Reduce Pollutant Introduction Design trash storage areas to reduce pollutant introduction. All trash container areas shall be paved with an impervious surface, designed not to allow run-on, screened or walled to prevent off-site transport of trash, and be provided with a roof or awning to prevent direct precipitation. Keep trash storage areas clean and orderly. Weekly. Owner or contracted maintenance personnel No S4. Use Efficient Irrigation Systems and Landscape Design No S5. Protect Slopes and Channels No S6. Loading Dock Areas No S7. Maintenance Bays and Docks PA2021-024
Exhibit B, Operations and Maintenance Plan Page 3 of 10 BMP Applicable? Yes/No BMP Name and BMP Implementation, Maintenance and Inspection Procedures Implementation, Maintenance, and Inspection Frequency and Schedule Person or Entity with Operation & Maintenance Responsibility No S8. Vehicle Wash Areas No S9. Outdoor Processing Areas No S10. Equipment Wash Areas No S11. Fueling Areas No S12. Site Design and Landscape Planning No S13. Wash Water Controls for Food Preparation Areas No S14. Community Car Wash Racks PA2021-024
Exhibit B, Operations and Maintenance Plan Page 4 of 10 BMP Name and BMP Implementation, Maintenance and Inspection Procedures Implementation, Maintenance, and Inspection Frequency and Schedule Person or Entity with Operation & Maintenance Responsibility Low Impact Development BMPs Infiltration Trench (Biotreatment). INF-2 Visual inspection for debris, standing water. Gravel/media replacement Twice yearly and after each storm event Every 10 years as required Owner via maintenance contractors PA2021-024
Exhibit B, Operations and Maintenance Plan Attachments
Required Permits
This section must list any permits required for the implementation, operation, and maintenance
of the BMPs. Possible examples are:
Permits for connection to sanitary sewer
Permits from California Department of Fish and Game
Encroachment permits
If no permits are required, a statement to that effect should be made.
Forms to Record BMP Implementation, Maintenance, and Inspection
The form that will be used to record implementation, maintenance, and inspection of BMPs is
attached.
Recordkeeping
All records must be maintained for at least five (5) years and must be made available for review
upon request.
PA2021-024
RECORD OF BMP IMPLEMENTATION, MAINTENANCE, AND INSPECTION
Today’s Date:
Name of Person Performing Activity
(Printed):
Signature:
BMP Name
(As Shown in O&M Plan)
Brief Description of Implementation, Maintenance, and
Inspection Activity Performed
PA2021-024
ATTACHMENT E
PA2021-024
ProjectNo.20210Ǧ01Page4December18,2020
2.0GEOTECHNICALCONDITIONS
2.1 GeneralizedGeologicConditions
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2.2Groundwater
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PA2021-024
2
139 Avenida Navarro
San Clemente, CA 92672
Tel: (949) 492‐8586
www.toalengineering.com
From: Kelby Styler <kstyler@lgcgeotechnical.com>
Sent: Tuesday, February 2, 2021 10:31 AM
To: Adam Toal <AToal@toalengineering.com>
Cc: Kevin Dyekman <kevind@lgcgeotechnical.com>
Subject: RE: 6806 W Oceanfront ‐ Infiltration
Ha! Not a great job, I have definitely met some peskier people.
Long story short, we would be comfortable with this style of infiltration if you make the trench a bit
deeper. Would you be able to deepen it to 36 inches? That would put the water infiltrating below the
historic high we used in our analysis (3 ft below existing surface) and keep the trench bottom > ~ 5ft
above our measured groundwater elevation (8 to 10 ft below existing surface).
Please note that infiltrating below the alleyway may cause some settling of the flatwork/pavement back
there. Hard to say if it will or won’t happen, just that it is a possibility.
Thank you,
Kelby Styler, PE
Project Engineer
<image001.png>
131 Calle Iglesia, Suite 200
San Clemente, CA 92672
office (949) 369‐6141
cell (949) 375‐4300
kstyler@lgcgeotechnical.com
www.lgcgeotechnical.com
From: Adam Toal <AToal@toalengineering.com>
Sent: Tuesday, February 02, 2021 8:55 AM
To: Kelby Styler <kstyler@lgcgeotechnical.com>
Subject: RE: 6806 W Oceanfront ‐ Infiltration
Good morning Kelby,
Trying my hand at being a pest about this! How am I doing?
Toal Engineering, Inc.
Adam Toal, PE
C: (949)683‐2934
CIVIL ENGINEERS ● LAND SURVEYORS
139 Avenida Navarro
San Clemente, CA 92672
Tel: (949) 492‐8586
www.toalengineering.com
PA2021-024
3
From: Kelby Styler <kstyler@lgcgeotechnical.com>
Sent: Friday, January 29, 2021 5:36 PM
To: Adam Toal <AToal@toalengineering.com>
Cc: Eric Aust <aust.architect@gmail.com>; Walter Clendenon <wclendenon@toalengineering.com>
Subject: Re: 6806 W Oceanfront ‐ Infiltration
Adam,
Thank you, will review next week and let you know our thoughts.
Have a great weekend,
Kelby Styler
Project Engineer
O: 949.369.6141
M: 949.375.4300
LGC Geotechnical, Inc.
From: Adam Toal <AToal@toalengineering.com>
Sent: Friday, January 29, 2021 5:04:01 PM
To: Kelby Styler <kstyler@lgcgeotechnical.com>
Cc: Eric Aust <aust.architect@gmail.com>; Walter Clendenon <wclendenon@toalengineering.com>
Subject: 6806 W Oceanfront ‐ Infiltration
Kelby,
Pursuant to our telephone conversation earlier today, attached please find a progress copy of our
preliminary grading plan showing the proposed infiltration trench along the alley frontage. Please let us
know if this type of infiltration can be considered geotechnically feasible for the site. We are open to
making modifications to the detail, and you can call me on my cell anytime to discuss.
Thanks and best regards,
Toal Engineering, Inc.
Adam Toal, PE
C: (949)683‐2934
CIVIL ENGINEERS ● LAND SURVEYORS
139 Avenida Navarro
San Clemente, CA 92672
Tel: (949) 492‐8586
www.toalengineering.com
CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you
recognize the sender and know the content is safe.
CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you
recognize the sender and know the content is safe.
PA2021-024