HomeMy WebLinkAbout20171114_WQMP-501 Via Lido
Water Quality
Management Plan
(WQMP)
Priority Project
Project Name:
Guida Residence
501 Via Lido Soud
Newport Beach, CA 92663
Prepared for:
John And Julia Guida
501 Via Lido Soud
Newport Beach, CA 92663
Prepared by:
Thomas M. Ruiz, P.E.
Forkert Engineering & Surveying, Inc.
22311 Brookhurst Street, Ste 203
Huntington Beach, CA 92646
714-963-6793
Date:
November 9, 2017
PA2017-239
Water Quality Management Plan (WQMP)
Guida Residence
501 Via Lido Soud Owner’s Certification
Project Owner’s Certification
Permit/Application No. Grading Permit No.
Tract/Parcel Map No. Building Permit No.
CUP, SUP, and/or APN (Specify Lot Numbers if Portions of Tract) APN 423 205 03
This Water Quality Management Plan (WQMP) has been prepared for John And Julia Guida by
Forkert Engineering & Surveying, 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: John And Julia Guida
Title Owner
Company
Address 501 Via Lido Soud
Newport Beach, CA 92663
Email
Telephone #
Signature Date
PA2017-239
Water Quality Management Plan (WQMP)
Guida Residence
501 Via Lido Soud ii
Contents Page No.
I. Discretionary Permits and Water Quality Conditions......…………..3
II.1 Project Description ....................................................................... 4
II.2 Potential Stormwater Pollutants .................................................. 5
II.3 Hydrologic Conditions of Concern ................................................ 6
II.4 Post Development Drainage Characteristics ................................ 7
II.5 Property Ownership/Management ............................................... 7
III.1 Physical Setting ............................................................................ 8
III.2 Site Characteristics ....................................................................... 8
III.3 Watershed Description ................................................................. 9
IV. 1 Project Performance Criteria ...................................................... 10
IV.3.1 Hydrologic Source Controls .................................................. 13
IV.3.2 Infiltration BMPs .................................................................. 14
IV.3.3 Evapotranspiration, Rainwater Harvesting BMPs ................ 15
IV.3.4 Biotreatment BMPs .............................................................. 16
IV.3.5 Hydromodification Control BMPs ......................................... 17
IV.3.7 Treatment Control BMPs ...................................................... 18
IV.3.8 Non-structural Source Control BMPs ................................... 19
IV.3.9 Structural Source Control BMPs ........................................... 20
V Inspection/Maintenance Responsibility for BMPs ..................... 21
VI Site Plan and Drainage Plan ....................................................... 22
VII Educational Materials ................................................................. 23
Attachments
Attachment A . .................................................................................................... PLOT Plan
Attachment B . ................................................................................. Educational Materials
Attachment C . ........................................ Reference Exhibits from County of Orange TGD
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Water Quality Management Plan (WQMP)
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501 Via Lido Soud Section I
Page 3
Section I Discretionary Permit(s) and
Water Quality Conditions
Provide discretionary permit and water quality information. Refer to Section 2.1 in the Technical
Guidance Document (TGD) available from the Orange County Stormwater Program (ocwatersheds.com).
Project Infomation
Permit/Application No. Permit Tract/Parcel Map No. Lots 456 And 457
of Tract No. 907
Additional Information/
Comments:
Water Quality Conditions
Water Quality Conditions
(list verbatim)
Priority Project:
Impervious surface of 2,500 square feet or more located within or directly
adjacent to (within 200 ft.) or discharging directly to receiving water within
environmentally sensitive areas (San Diego Creek, upper and lower Newport
Bay, Buck Gully, Los Trankos, Little Corona del Mar Beach, Crystal Cove
State Beach).
Watershed-Based Plan Conditions
Provide applicable
conditions from
watershed - based plans
including WIHMPs and
TMDLS.
Newport Beach Marine Life Refuge via Morning Canyon Creek.
No WIHMP
TMDL: –Indicator Bacteria
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Section II Project Description
II.1 Project Description
Provide a detailed project description including:
Project areas;
Land uses;
Land cover;
Design elements;
A general description not broken down by drainage management areas (DMAs).
Include attributes relevant to determining applicable source controls. Refer to Section 2.2 in the TGD
for information that must be included in the project description.
Description of Proposed Project
Development Category
(Verbatim from WQMP):
Priority Project:
Impervious surface of 2,500 square feet or more located within or directly adjacent to
(within 200 ft.) or discharging directly to receiving water within environmentally
sensitive areas (San Diego Creek, upper and lower Newport Bay, Buck Gully, Los
Trankos, Little Corona del Mar Beach, Crystal Cove State Beach).
Project Area (ft2): 7,349 Number of Dwelling Units: _____1_____ SIC Code 1521
Narrative Project
Description:
The project consists of the construction of a single family residence with a
garage, concrete walkways, patios and a pool. The project is located in
Newport Beach, CA in the NOC Permit Area.
Project Area
Pervious Impervious
Area
(acres or sq ft) Percentage Area
(acres or sq ft) Percentage
Pre-Project Conditions 16 sf 1% 7,333 sf 99%
Post-Project Conditions 330 sf 4% 7,019 sf 96%
Drainage
Patterns/Connections
The lot drains from the slightly toward Via Lido Soud on the upper pad. About
1/3 back, the lot drops approximately 2 feet next to Newport Harbor . There are
no storm drain connections.
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II.2 Potential Stormwater Pollutants
Determine and list expected stormwater pollutants based on land uses and site activities. Refer to
Section 2.2.2 and Table 2.1 in the TGD for guidance.
Pollutants of Concern
Pollutant
Circle One:
E=Expected to
be of concern
N=Not Expected
to be of concern
Additional Information and Comments
Suspended-Solid/ Sediment E 303(d) listed impairment/TMDL
Nutrients E 303(d) listed impairment/TMDL
Heavy Metals N 303(d) listed impairment/TMDL
Not expected per OCTGD Table 2.1.
Pathogens (Bacteria/Virus) E 303(d) listed impairment/TMDL
Pesticides E 303(d) listed impairment/TMDL
Oil and Grease E
Toxic Organic Compounds N
Trash and Debris E
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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. Refer to Section 2.2.3.1 in the TGD for NOOC or Section
2.2.3.2 for <SOC>.
No – Show map
Yes – Describe applicable hydrologic conditions of concern below. Refer to Section 2.2.3 in the
TGD.
Based on Figure XVI‐3d of the OCTGD, the project does not fall in an area of Potential Areas
of Erosion, Habitat, & Physical Structure Susceptibility. Therefore no HCOC exists.
See Attachment C.
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II.4 Post Development Drainage Characteristics
Describe post development drainage characteristics. Refer to Section 2.2.4 in the TGD.
Most of the runoff will be from the roof which will be collected into an area drain line. This runoff will either
be will be run through a infiltration trench or discharged onto a bio‐retention planter. The runoff will then be
pumped up and out to Via Lido Soud. From here, the runoff will drain into the City of Newport Beach’s storm
drain system.
The project runoff will eventually drain into the Pacific Ocean. There will be no direct storm drain
connections.
II.5 Property Ownership/Management
Describe property ownership/management. Refer to Section 2.2.5 in the TGD.
The property owner will be responsible for the long term maintenance of the facilities.
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Section III Site Description
III.1 Physical Setting
Fill out table with relevant information. Refer to Section 2.3.1 in the TGD.
Planning Area/
Community Name Lido Isle Community Association
Location/Address
501 Via Lido Soud
Newport Beach, CA
Land Use Residential
Zoning Residential
Acreage 0.1687
Predominant Soil Type Native soils encountered consisted of clean, medium to coarse-
grained sand, and silty medium to coarse-grained sand
III.2 Site Characteristics
Fill out table with relevant information and include information regarding BMP sizing, suitability, and
feasibility, as applicable. Refer to Section 2.3.2 in the TGD.
Precipitation Zone 0.7” per Orange County Rainfall Zones Map, Figure XVI-1 of the
Technical Guidance Document
Topography
The project site is located at 501 Via Lido Soud, between Via Koron and Via
Lorca, in the City of Newport Beach, California.
The parcel is rectangular in shape, near level, and bordered by Via Lido Soud
to the north, Newport Bay to the south, and developed residential properties
to the east and west.
The lot is currently developed with a single-family residence, pool, and
hardscape.
Drainage
Patterns/Connections
Most of the runoff will be from the roof which will be collected into an area drain
line. This runoff will either be will be run through an infiltration trench or
discharged onto a bio-retention planter. The runoff will then be pumped up and out
to Via Lido Soud. From here, the runoff will drain into the City of Newport Beach’s
storm drain system.
The project runoff will eventually drain into the Pacific Ocean. There will be no
direct storm drain connections.
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Soil Type, Geology, and
Infiltration Properties
Per the soils report prepared by Coast Geotechnical, Inc., artificial fills were
encountered to a depth of about 2.5 feet below existing grade. Native soils
encountered consisted of clean, medium to coarse-grained sand, and silty
medium to coarse-grained sand.
Site Characteristics (continued)
Hydrogeologic
(Groundwater) Conditions Groundwater was observed 6 feet below existing grade.
Geotechnical Conditions
(relevant to infiltration)
Native soils encountered consisted of clean, medium to coarse-
grained sand, and silty medium to coarse-grained sand.
Off-Site Drainage There is no off‐site drainage onto the site.
Utility and Infrastructure
Information No utilities on lot except for service lines.
III.3 Watershed Description
Fill out table with relevant information and include information regarding BMP sizing, suitability,
and feasibility, as applicable. Refer to Section 2.3.3 in the TGD.
Receiving Waters Lower Newport Harbor
303(d) Listed Impairments Metals/Metalloids, Pesticides, Pathogens, Metals/Metalloids
Nutrients, Other Organics, Pesticides, Toxicity, Sediment
Applicable TMDLs Pathogens, Nutrients
Pollutants of Concern for
the Project Sediments, Nutrients, Pathogens, Pesticides, Oil & Grease, Trash & Debris
Environmentally Sensitive
and Special Biological
Significant Areas
The site runoff does not discharge directly to an ESA.
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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. Refer to Section 7.II-
2.4.2.2 of the Model WQMP.
Determine applicable LID performance criteria. Refer to Section 7.II-2.4.3 of the Model WQMP.
Determine applicable treatment control BMP performance criteria. Refer to Section 7.II-3.2.2 of
the Model WQMP.
Calculate the LID design storm capture volume for the project. Refer to Section 7.II-2.4.3 of the
Model WQMP.
(NOC Permit Area only) 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.
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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)
Based on Figure XVI‐3d of the OCTGD, the project does not fall in an area of Potential
Areas of Erosion, Habitat, & Physical Structure Susceptibility. Therefore no HCOC
exists.
See Attachment C
List applicable LID
performance
criteria (Section
7.II-2.4.3 from
MWQMP)
Priority Projects must infiltrate, harvest and use, evapotranspire, or biotreat/biofilter,
the 85th percentile, 24‐hour storm event (Design Capture Volume).
A properly designed bio‐treatment 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 bio‐treatment 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; a waiver application and participation in an alternative program is
not required.
Calculate LID
design storm
capture volume
for Project.
V = C × d × A × 43560 sf/ac × 1/12 in/ft
C = runoff coefficient = (0.75 × imp + 0.15) =0.75 x 0.96 + .15 = 0.87
d = storm depth (inches) =0.7 in Per Fig XVI‐1‐ OC TGD
A = tributary area (acres) = 7,349 SF = 0.1687 ac
V= 0.87 x .7 x 0.1687 x 43,560 x 1/12 = 372 cf
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501 Via Lido Soud Section IV
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IV.2. SITE DESIGN AND DRAINAGE PLAN
Describe site design and drainage plan including
A narrative of site design practices utilized or rationale for not using practices;
A narrative of how site is designed to allow BMPs to be incorporated to the MEP
A table of DMA characteristics and list of LID BMPs proposed in each DMA.
Reference to the WQMP plot plan.
Calculation of Design Capture Volume (DCV) for each drainage area.
A listing of GIS coordinates for LID and Treatment Control BMPs (unless not required by
local jurisdiction).
Refer to Section 2.4.2 in the TGD.
The project consists of the construction of a 2 story building with a basement, attached garage, patios and a
pool. The site is approximately 2 feet lower in the back 2/3 of the lot.
The site will be divided into 2 Drainage Management Areas (DMA). In DMA 1, runoff from the roof will be
collected into an area drain line as well as the surface runoff. The runoff will be piped through a rock‐filled
infiltration trench. It will be pre‐treated with a filter first to remove sediment and pollutants.
In DMA 2, the runoff from the roof will be discharged directly into bio‐retention planter located next to the
building.
The runoff from DMA 1 and DMA 2 will be collected into a sump and pumped up and out to Via Lido Soud.
From here, the runoff will drain into the City of Newport Beach’s storm drain system.
See Attachment A for PLOT plan.
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IV.3 LID BMP SELECTION AND PROJECT CONFORMANCE ANALYSIS
Each sub-section below documents that the proposed design features conform to the applicable
project performance criteria via check boxes, tables, calculations, narratives, and/or references to
worksheets. Refer to Section 2.4.2.3 in the TGD for selecting LID BMPs and Section 2.4.3 in the TGD for
conducting conformance analysis with project performance criteria.
IV.3.1 Hydrologic Source Controls
If required HSCs are included, fill out applicable check box forms. If the retention criteria are
otherwise met with other LID BMPs, include a statement indicating HSCs not required.
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)
Other:
Other:
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TECHNICAL GUIDANCE DOCUMENT
2-34 May 19, 2011
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 VIII
(Worksheet I) for guidance on groundwater-related
infiltration feasibility criteria.
Provide basis:
Summarize findings of studies provide reference to studies, calculations, maps, data sources,
etc. Provide narrative discussion of study/data source applicability.
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.
Provide basis:
Summarize findings of studies provide reference to studies, calculations, maps, data sources,
etc. Provide narrative discussion of study/data source applicability.
3 Would infiltration of the DCV from drainage area violate
downstream water rights?
Provide basis:
Summarize findings of studies provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability.
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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?
Provide basis:
Summarize findings of studies provide reference to studies, calculations, maps, data sources,
etc. Provide narrative discussion of study/data source applicability.
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.
Provide basis:
Summarize findings of studies provide reference to studies, calculations, maps, data sources,
etc. Provide narrative discussion of study/data source applicability.
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?
Provide citation to applicable study and summarize findings relative to the amount of infiltration
that is permissible:
Summarize findings of studies provide reference to studies, calculations, maps, data sources, etc. Provide narrative discussion of study/data source applicability.
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?
Provide citation to applicable study and summarize findings relative to the amount of infiltration
that is permissible:
Summarize findings of studies provide reference to studies, calculations, maps, data sources,
etc. Provide narrative discussion of study/data source applicability.
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TECHNICAL GUIDANCE DOCUMENT
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Table 2.7: Infiltration BMP Feasibility Worksheet (continued)
Infiltration Screening Results (check box corresponding to result):
8
Is there substantial evidence that infiltration from the
project would result in a significant increase in I&I to the
sanitary sewer that cannot be sufficiently mitigated? (See
Appendix XVII)
Provide narrative discussion and supporting evidence:
Summarize findings of studies provide reference to studies, calculations, maps, data sources, etc. Provide
narrative discussion of study/data source applicability.
9
If any answer from row 1-3 is yes: infiltration of any volume is not feasible within the DMA or equivalent.
Provide basis:
Summarize findings of infeasibility screening
10
If any answer from row 4-7 is yes, infiltration is
permissible but is not presumed to be feasible for the
entire DCV. Criteria for designing biotreatment BMPs to achieve the maximum feasible infiltration and ET shall
apply.
Provide basis:
Summarize findings of infeasibility screening
11 If all answers to rows 1 through 11 are no, infiltration of the full DCV is potentially feasible, BMPs must be designed to
infiltrate the full DCV to the maximum extent practicable.
Harvest and Use Infeasibility
Harvest and use infeasibility criteria include:
If inadequate demand exists for the use of the harvested rainwater. See Appendix X for
guidance on determining harvested water demand and applicable feasibility thresholds.
If the use of harvested water for the type of demand on the project violates codes or
ordinances most applicable to stormwater harvesting in effect at the time of project
application and a waiver of these codes and/or ordinances cannot be obtained. It is
noted that codes and ordinances most applicable to stormwater harvesting may change
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IV.3.2 Infiltration BMPs
Identify infiltration BMPs to be used in project. If design volume cannot be met state why BMPs
cannot be met
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:
Show calculations below to demonstrate if the LID Design Strom Capture Volume can be met with
infiltration BMPs. If not document how much can be met with infiltration and document why it is
not feasible to meet the full volume with infiltration BMPs.
DMA 1 = 2280 sf, V = C × d × A × 1/12 in/ft = .87 x .7 x 2280 x 1/12 = 116
Rock length (min) = 15 lf / 2000 sf impervious = 2280 x 15 x 1/2000 = 17 lf
Storage Volume of Infiltration rock trench= 2’x 2’x 17’ = 68 cf x 40(porosity) = 27 cf
Runoff infiltrated to maximum extent possible. Will need to pre‐treat runoff upstream.
2 Year Storm
Q= CIA, Q = cfs, I= in/hr, A= acres per OCHM
I=intensity, in/hr = at(b) per OCHM, t=duration = 5 min
I = 5.702 x 5(‐0.574) = 2.26 in/hr
A1 = 2280/43,560=0.0523 Q1= .87 x 2.26 x .0523 = 0.1028 cfs
Use filter inserts by REM Inc, and/or Kristar Enterprises
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IV.3.3 Evapotranspiration, Rainwater Harvesting BMPs
If the full Design Storm Capture Volume cannot be met with infiltration BMPs, describe any
evapotranspiration, rainwater harvesting BMPs. <Delete or leave blank if not used>
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:
Show calculations below to demonstrate if the LID Design Strom Capture Volume can be met with
evapotranspiration, rainwater harvesting BMPs in combination with infiltration BMPs. If not
document how much can be met with either infiltration BMPs, evapotranspiration, rainwater
harvesting BMPs, or a combination, and document why it is not feasible to meet the full volume
with either of these BMPs categories.
Project does not meet feasibility requirement for rainwater harvesting. See Worksheet J.
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TECHNICAL GUIDANCE DOCUMENT APPENDICES
X-13 May 19, 2011
Table X.8: Minimum Irrigated Area for Potential Partial Capture Feasibility
General Landscape
Type Conservation Design: KL = 0.35 Active Turf Areas: KL = 0.7
Closest ET Station Irvine Santa Ana Laguna Irvine Santa Ana Laguna
Design Capture Storm
Depth, inches
Minimum Required Irrigated Area per Tributary Impervious Acre for
Potential Partial Capture, ac/ac
0.60 0.66 0.68 0.72 0.33 0.34 0.36
0.65 0.72 0.73 0.78 0.36 0.37 0.39
0.70 0.77 0.79 0.84 0.39 0.39 0.42
0.75 0.83 0.84 0.90 0.41 0.42 0.45
0.80 0.88 0.90 0.96 0.44 0.45 0.48
0.85 0.93 0.95 1.02 0.47 0.48 0.51
0.90 0.99 1.01 1.08 0.49 0.51 0.54
0.95 1.04 1.07 1.14 0.52 0.53 0.57
1.00 1.10 1.12 1.20 0.55 0.56 0.60
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 inches
6 What is the project size? A ac
7 What is the acreage of impervious area? IA ac
For projects with both toilet flushing and indoor demand
8 What is the minimum use required for partial capture? (Table
X.6) gpd
9 What is the project estimated minimum wet season total daily
use? 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?
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TECHNICAL GUIDANCE DOCUMENT APPENDICES
X-14 May 19, 2011
Worksheet J: Summary of Harvested Water Demand and Feasibility
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) ac
15 What is the proposed project irrigated area? (multiply
conservation landscaping by 1; multiply active turf by 2) ac
16 Is partial capture potentially feasible? (Line 15 > Line 14?)
Provide supporting assumptions and citations for controlling demand calculation:
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IV.3.4 Biotreatment BMPs
If the full Design Storm Capture Volume cannot be met with infiltration BMPs, and/or
evapotranspiration and rainwater harvesting BMPs, describe biotreatment BMPs. Include sections
for selection, suitability, sizing, and infeasibility, as applicable. <Delete or leave blank if not used>
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:
Other:
Show calculations below to demonstrate if the LID Design Strom Capture Volume can be met with
infiltration, evapotranspiration, rainwater harvesting and/or biotreatment BMPs. If not document
how much can be met with either infiltration BMPs, evapotranspiration, rainwater harvesting
BMPs, or a combination, and document why it is not feasible to meet the full volume with either of
these BMPs categories.
See “Bioretention with Underdrains Calculations” worksheet.
PA2017-239
CALCULATIONS FOR
BIORETENTION WITH UNDERDRAINS
BMP BIORETENTION WITH UNDERDRAINS
Capture Efficiency Method for Planter/Bioretention with Underdrains
(Per Orange County Technical Guidance Document)
Step 1: Determine the drawdown time associated with the selected basin geometry
DD = (dp / KDESIGN) × 12 in/ft
DD = time to completely drain infiltration basin ponding depth, hours
dp = depth of ponding above bio-retention area, ft (not to exceed 1.5 ft)
KDESIGN= 2.5 in/hr
DD = (.83/ 2.5) × 12 in/ft = 3.9 hours
Step 2: Determine the Required Adjusted DCV for this Drawdown Time
See Worksheet C: Capture Efficiency Method for Volume-Based, Constant Drawdown BMPs
DCV-2 = 54.16 Cu Ft
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
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 bio-retention area, ft (from Step 1)
A2 = 54.16/.83 = 65.2 SF-Required
Bio-retention surface area used- 19’x3.5’ = 66.5 SF
PA2017-239
TECHNICAL GUIDANCE DOCUMENT APPENDICES
III-20 May 19, 2011
Worksheet C: Capture Efficiency Method for Volume-Based, Constant Drawdown BMPs
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= inches
2 Enter calculated drawdown time of the proposed BMP based
on equation provided in applicable BMP Fact Sheet, T (hours) T= hours
3 Using Figure III.2, determine the "fraction of design capture
storm depth" at which the BMP drawdown time (T) line
achieves 80% capture efficiency, X1
X1=
4 Enter the effect depth of provided HSCs upstream, dHSC
(inches) (Worksheet A) dHSC= inches
5 Enter capture efficiency corresponding to dHSC, Y2
(Worksheet A) Y2= %
6
Using Figure III.2, determine the fraction of "design capture
storm depth" at which the drawdown time (T) achieves the
equivalent of the upstream capture efficiency(Y2), X2
X2=
7 Calculate the fraction of design volume that must be provided
by BMP, fraction = X1 - X2 fraction=
8 Calculate the resultant design capture storm depth (inches),
dfraction= fraction × d dfraction= inches
Step 2: Calculate the DCV
1 Enter Project area tributary to BMP (s), A (acres) A= acres
2 Enter Project Imperviousness, imp (unitless) imp=
3 Calculate runoff coefficient, C= (0.75 x imp) + 0.15 C=
4
Calculate runoff volume, Vdesign= (C x drfraction x A x 43560 x
(1/12)) Vdesign= cu-ft
Supporting Calculations
Describe system:
Provide drawdown time calculations per applicable BMP Fact Sheet:
PA2017-239
TECHNICAL GUIDANCE DOCUMENT APPENDICES III-11 May 19, 2011 Figure III.2. Capture Efficiency Nomograph for Constant Drawdown Systems in Orange County PA2017-239
Water Quality Management Plan (WQMP)
Guida Residence
501 Via Lido Soud Section IV
WQMP Page 17
IV.3.5 Hydromodification Control BMPs
Describe hydromodification control BMPs. See Section 5 TGD. Include sections for selection,
suitability, sizing, and infeasibility, as applicable. Detail compliance with Prior Conditions of
Approval. <Delete or leave blank if not used>
Hydromodification Control BMPs
BMP Name BMP Description
PA2017-239
Water Quality Management Plan (WQMP)
Guida Residence
501 Via Lido Soud Section IV
WQMP Page 18
IV.3.7 Treatment Control BMPs
Treatment control BMPs can only be considered if the project conformance analysis indicates that it is not
feasible to retain the full design capture volume with LID BMPs. Describe treatment control BMPs including
sections for selection, sizing, and infeasibility, as applicable. <Delete or leave blank if not used>
Treatment Control BMPs
BMP Name BMP Description
PRE-2 Catch Bain Inserts
PA2017-239
Water Quality Management Plan (WQMP)
Guida Residence
501 Via Lido Soud Section IV
WQMP Page 19
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 N/A-Single Family Residence
N3 Common Area Landscape
Management N/A-Single Family Residence
N4 BMP Maintenance
N5 Title 22 CCR Compliance (How
development will comply) N/A-Single Family Residence
N6 Local Industrial Permit Compliance N/A-Single Family Residence
N7 Spill Contingency Plan N/A-Single Family Residence
N8 Underground Storage Tank
Compliance N/A-No Underground tanks
N9 Hazardous Materials Disclosure
Compliance N/A-Single Family Residence
N10 Uniform Fire Code Implementation N/A-Single Family Residence
N11 Common Area Litter Control N/A-Single Family Residence
N12 Employee Training N/A-Single Family Residence
N13 Housekeeping of Loading Docks N/A-Single Family Residence
N14 Common Area Catch Basin Inspection N/A-Single Family Residence
N15 Street Sweeping Private Streets and
Parking Lots N/A-Single Family Residence
N16 Retail Gasoline Outlets N/A-Single Family Residence
PA2017-239
Water Quality Management Plan (WQMP)
Guida Residence
501 Via Lido Soud Section IV
WQMP Page 20
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 Project is Single Family Residence
S2
Design and construct outdoor material
storage areas to reduce pollution
introduction
Project is Single Family Residence
S3
Design and construct trash and waste
storage areas to reduce pollution
introduction
Project is Single Family Residence
S4
Use efficient irrigation systems &
landscape design, water conservation,
smart controllers, and source control
S5 Protect slopes and channels and
provide energy dissipation
Incorporate requirements applicable to
individual priority project categories
(from SDRWQCB NPDES Permit)
Santa Ana Region
S6 Dock areas Project is Single Family Residence
S7 Maintenance bays Project is Single Family Residence
S8 Vehicle wash areas Project is Single Family Residence
S9 Outdoor processing areas Project is Single Family Residence
S10 Equipment wash areas Project is Single Family Residence
S11 Fueling areas Project is Single Family Residence
S12 Hillside landscaping Lot is flat
S13 Wash water control for food
preparation areas Project is Single Family Residence
S14 Community car wash racks Project is Single Family Residence
PA2017-239
Water Quality Management Plan (WQMP)
Guida Residence
501 Via Lido Soud Section V
WQMP Page 21
Section V Inspection/Maintenance
Responsibility for BMPs
Fill out information in table below. 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. Refer to
Section 7.II 4.0 in the Model WQMP.
BMP Inspection/Maintenance
BMP Responsible
Party(s)
Inspection/
Maintenance
Activities Required
Minimum
Frequency of
Activities
Bio‐retention with
underdrains Home Owner
Inspect and clean as
necessary to ensure flow
and drainage. Add 2” of
mulch annually or as
needed.
Monthly during non‐rainy
season. Weekly during
rainy season and after a
storm event. Add 2” of
mulch annually.
Infiltration Trench Home Owner
Inspect and clean as
necessary to ensure flow
and drainage. Run auger
through as needed.
Monthly during non‐rainy
season. Weekly during
rainy season and after a
storm event.
Catch Bain Inserts Home Owner
Inspect and clean as
necessary to ensure flow
and drainage. Replace
filter annually
Monthly during non‐rainy
season. Weekly during
rainy season and after a
storm event
PA2017-239
Water Quality Management Plan (WQMP)
Guida Residence
501 Via Lido Soud Section VI
WQMP Page 22
Section VI Site Plan and Drainage Plan
VI.1 SITE PLAN AND DRAINAGE PLAN
Include a site plan and drainage plan sheet set 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
VI.2 ELECTRONIC DATA SUBMITTAL <optional – delete if not used>
The minimum requirement is to provide submittal of PDF exhibits in addition to hard copies.
Format must not require specialized software to open.
If the local jurisdiction requires specialized electronic document formats (CAD, GIS) to be
submitted, this section will be used to describe the contents (e.g., layering, nomenclature,
georeferencing, etc.) of these documents so that they may be interpreted efficiently and accurately.
PA2017-239
Water Quality Management Plan (WQMP)
Guida Residence
501 Via Lido Soud Section VI
WQMP Page 23
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)
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
PA2017-239
ATTACHMENT A
WQMP PLOT PLAN
PA2017-239
PA2017-239
ATTACHMENT B
EDUCATION MATERIALS
PA2017-239
C lean beaches
and healthy
creeks, rivers, bays
and ocean are important to
Orange County. However,
many common activities
can lead to water pollution
if you’re not careful. Pet
waste and pet care products
can be washed into the
storm drains that flow to
the ocean. Unlike water in
sanitary sewers (from sinks
and toilets), water in storm
drains is not treated before
entering our waterways.
You would never put pet
waste or pet care products
into the ocean, so don’t let
them enter the storm drains.
Follow these easy tips to help
prevent water pollution.
For more information,
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 Problem
Reporting Hotline
1-877-89-SPILL (1-877-897-7455).
For emergencies, dial 911.
The tips contained in this brochure provide useful
information to help prevent water pollution while
caring for your pet. If you have other suggestions,
please contact your city’s stormwater representatives
or call the Orange County Stormwater Program.
Printed on Recycled Paper
PA2017-239
Never let any pet care products or
washwater run off your yard and into
the street, gutter or storm drain.
Washing Your Pets
Even biodegradable soaps and
shampoos can be harmful to marine
life and the environment.
If possible, bathe your pets indoors
using less-toxic shampoos or have
your pet professionally groomed.
Follow instructions on the products
and clean up spills.
If you bathe your pet outside, wash it
on your lawn or another absorbent/
permeable surface to keep the
washwater from running into the
street, gutter or storm drain.
Flea Control
Consider using oral or topical flea
control products.
If you use flea control products
such as shampoos, sprays or collars,
make sure to dispose of any unused
products at
a Household
Hazardous
Waste
Collection
Center. For
location
information,
call (714) 834-6752.
Why You Should Pick Up After
Your Pet
It’s the law!
Every city has
an ordinance
requiring you
to pick up
after your pet.
Besides being
a nuisance, pet
waste can lead to water pollution, even
if you live inland. During rainfall, pet
waste left outdoors can wash into storm
drains. This waste flows directly into our
waterways and the ocean where it can
harm human health, marine life and
the environment.
As it decomposes, pet waste demands
a high level of oxygen from water.
This decomposition can contribute to
killing marine
life by reducing
the amount of
dissolved oxygen
available to
them.
Have fun with
your pets, but
please be a
responsible pet
owner by taking
care of them and the environment.
Take a bag with you on walks to pick
up after your pet.
Dispose of the waste in the trash or in
a toilet.
Tips for Pet CarePA2017-239
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 911.
The tips contained in this brochure provide useful
information to help prevent water pollution
while landscaping or gardening. If you have other
suggestions, please contact your city’s stormwater
representatives or call the Orange County
Stormwater Program.
C lean beaches
and healthy
creeks, rivers, bays
and ocean are important to
Orange County. However,
many common activities
can lead to water pollution
if you’re not careful.
Fertilizers, pesticides and
other chemicals that are left
on yards or driveways can
be blown or washed into
storm drains that flow to the
ocean. Overwatering lawns
can also send materials into
storm drains. Unlike water
in sanitary sewers (from sinks
and toilets), water in storm
drains is not treated before
entering our waterways.
You would never pour
gardening products into the
ocean, so don’t let them enter
the storm drains. Follow
these easy tips to help prevent
water pollution.
Printed on Recycled Paper
PA2017-239
Tips for Landscape and GardeningTips for Landscape & Gardening
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 drains. 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.
Household Hazardous Waste
Collection Centers
Anaheim: 1071 N. Blue Gum St.
Huntington Beach: 17121 Nichols St.
Irvine: 6411 Oak Canyon
San Juan Capistrano: 32250 La Pata Ave.
For more information, call (714) 834-6752
or visit www.oclandfills.com
PA2017-239
Help Prevent Ocean Pollution:
For more information,
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 Problem
Reporting Hotline
at 1-877-89-SPILL (1-877-897-7455).
For emergencies, dial 911.
The tips contained in this brochure provide useful
information to help prevent water pollution while
performing home improvement projects. If you
have other suggestions, please contact your city’s
stormwater representatives or call the Orange
County Stormwater Program.
Clean beaches
and healthy
creeks, rivers, bays
and ocean are important to
Orange County. However, many
common activities can lead to
water pollution if you’re not
careful. Home improvement
projects and work sites must
be maintained to ensure that
building materials do not enter
the street, gutter or storm drain.
Unlike water in sanitary sewers
(from sinks and toilets), water
in storm drains is not treated
before entering our waterways.
You would never dump building
materials into the ocean, so
don’t let them enter the storm
drains. Follow these tips to help
prevent water pollution.
Printed on Recycled Paper
PA2017-239
Tips for Pool Maintenance
When permanently removing large quantities of
soil, a disposal location must be found prior to
excavation. Numerous businesses are available to
handle disposal needs. For disposal options, visit
www.ciwmb.ca.gov/SWIS.
Prevent erosion by planting fast-growing annual and
perennial grasses. They will shield and bind the soil.
Recycle
Use a construction and demolition recycling company to recycle lumber, paper, cardboard, metals, masonry (bricks, concrete, etc.), carpet, plastic, pipes (plastic, metal and clay), drywall, rocks, dirt and green waste.
For a listing of construction and demolition recycling locations in your area, visit www.ciwmb.ca.gov/recycle.
Spills
Clean up spills immediately by using an absorbent material such as cat litter, then sweep it up and dispose of it in the trash.
Immediately report spills that have entered the street, gutter or storm drain to the County’s 24-Hour Water Pollution Problem Reporting Hotline at (714) 567-6363 or visit www.ocwatersheds.com to fill out an incident reporting form.
Home improvement projects can cause significant
damage to the environment. Whether you hire
a contractor or work on the house yourself, it
is important to follow these simple tips while
renovating, remodeling or improving your home:
General Construction
Schedule projects for dry
weather.
Keep all construction debris
away from the street, gutter
and storm drain.
Store materials under cover
with temporary roofs or plastic
sheets to eliminate or reduce
the possibility that rainfall,
runoff or wind will carry
materials from the project site
to the street, storm drain or
adjacent properties.
Building Materials
Never hose materials into a street, gutter or storm
drain.
Exposed piles of construction material should not be
stored on the street or sidewalk.
Minimize waste by ordering only the amount of
materials needed to complete the job.
Do not mix more fresh concrete than is needed for
each project.
Wash concrete mixers and equipment in a
designated washout area where the water can flow
into a containment area or onto dirt.
Dispose of small amounts of dry excess materials in
the trash. Powdery waste, such as dry concrete, must
be properly contained within a box or bag prior to
disposal. Call your local trash hauler for weight and
size limits.
Paint
Measure the room or object to be painted, then buy
only the amount needed.
Place the lid on firmly and store the paint can upside-
down in a dry location away from the elements.
Tools such as brushes, buckets and rags should never
be washed where excess water can drain into the
street, gutter or storm drain. All tools should be
rinsed in a sink connected to the sanitary sewer.
When disposing of paint, never put wet paint in the
trash.
Dispose of water-based paint by removing the lid
and letting it dry
in the can. Large
amounts must be
taken to a Household
Hazardous Waste
Collection Center
(HHWCC).
Oil-based paint is a
household hazardous
waste. All leftover
paint should be taken
to a HHWCC.
For HHWCC locations and hours, call (714) 834-6752
or visit www.oclandfills.com.
Erosion Control
Schedule grading and excavation projects for dry weather.
When temporarily removing soil, pile it in a contained, covered area where it cannot spill into the street, or obtain the required temporary encroachment or street closure permit and follow the conditions instructed by the permit.
Tips for Home Improvement ProjectsPA2017-239
Clean beaches and healthy
creeks, rivers, bays and
ocean are important
to Orange County. However,
many common activities such as
pest control can lead to water
pollution if you’re not careful.
Pesticide treatments must be
planned and applied properly
to ensure that pesticides do
not enter the street, gutter or
storm drain. Unlike water in
sanitary sewers (from sinks and
toilets), water in storm drains is
not treated before entering our
waterways.
You would never dump pesticides
into the ocean, so don’t let it
enter the storm drains. Pesticides
can cause significant damage
to our environment if used
improperly. If you are thinking
of using a pesticide to control a
pest, there are some important
things to consider.
For more information,
please call
University of California Cooperative
Extension Master Gardeners at
(714) 708-1646
or visit these Web sites:
www.uccemg.org
www.ipm.ucdavis.edu
For instructions on collecting a specimen
sample visit the Orange County
Agriculture Commissioner’s website at:
http://www.ocagcomm.com/ser_lab.asp
To report a spill, call the
Orange County 24-Hour
Water Pollution Problem
Reporting Hotline
at 1-877-89-SPILL (1-877-897-7455).
For emergencies, dial 911.
Information From:
Cheryl Wilen, Area IPM Advisor; Darren Haver,
Watershed Management Advisor; Mary
Louise Flint, IPM Education and Publication
Director; Pamela M. Geisel, Environmental
Horticulture Advisor; Carolyn L. Unruh,
University of California Cooperative
Extension staff writer. Photos courtesy of
the UC Statewide IPM Program and
Darren Haver.
Funding for this brochure has been provided in full
or in part through an agreement with the State Water
Resources Control Board (SWRCB) pursuant to the
Costa-Machado Water Act of 2000 (Prop. 13).
Help Prevent Ocean Pollution:
The Ocean Beginsat Your Front Door
Responsible
Pest Control
Printed on Recycled Paper
PA2017-239
Key Steps to Follow:
Step 1: Correctly identify the pest (insect,
weed, rodent, or disease) and verify that it is
actually causing the problem.
This is important
because beneficial
insects are often
mistaken for pests
and sprayed with pesticides needlessly.
Consult with a
Certified Nursery
Professional at a local nursery or garden center or send a sample of the pest to the Orange
County Agricultural Commissioner’s Office.
Determine if the pest is still present – even
though you see damage, the pest may have left.
Step 2: Determine
how many pests are
present and causing
damage.
Small pest populations
may be controlled
more safely using non-
pesticide techniques. These include removing food sources, washing off leaves with a strong
stream of water, blocking entry into the home
using caulking and replacing problem plants
with ones less susceptible to pests.
Step 3: If a pesticide must be used, choose the least toxic chemical.
Obtain information on the least toxic pesticides
that are effective at controlling the target
pest from the UC Statewide Integrated Pest Management (IPM) Program’s Web site at
www.ipm.ucdavis.edu.
Seek out the assistance of a Certified Nursery
Professional at a local nursery or garden center when selecting a pesticide. Purchase the
smallest amount of pesticide available.
Apply the pesticide to the pest during its most
vulnerable life stage. This information can be found on the pesticide label.
Step 4: Wear appropriate protective clothing.
Follow pesticide labels regarding specific types of protective equipment you should wear.
Protective clothing should always be washed
separately from other clothing.
Step 5: Continuously monitor external conditions when applying pesticides such as
weather, irrigation, and the presence of children
and animals.
Never apply pesticides when rain is predicted within the next 48 hours. Also, do not water
after applying pesticides unless the directions say
it is necessary.
Apply pesticides when the air is still; breezy conditions may cause the spray or dust to drift
away from your targeted area.
In case of an emergency call 911 and/or the
regional poison control number at (714) 634-5988 or (800) 544-4404 (CA only).
For general questions you may also visit www.calpoison.org.
Step 6: In the event of accidental spills,
sweep up or use an absorbent agent to remove
any excess pesticides. Avoid the use of water.
Be prepared. Have a broom, dust pan, or dry
absorbent material, such as cat litter, newspapers
or paper towels, ready to assist in cleaning up
spills.
Contain and clean up the spill right away. Place
contaminated materials in a doubled plastic bag.
All materials used to clean up the spill should
be properly disposed of according to your local Household Hazardous Waste Disposal site.
Step 7: Properly store and dispose of unused
pesticides.
Purchase Ready-To-
Use (RTU) products
to avoid storing
large concentrated
quantities of pesticides.
Store unused chemicals in a locked cabinet.
Unused pesticide chemicals may be disposed of at a Household Hazardous Waste Collection
Center.
Empty pesticide containers should be triple
rinsed prior to disposing of them in the trash.
Household Hazardous Waste Collection Center(714) 834-6752www.oclandfills.com
Integrated Pest Management (IPM) usually combines several least toxic pest control methods for long-term prevention and management of pest problems without harming you, your family, or the environment.
Three life stages of the common lady
beetle, a beneficial insect.
Tips for Pest Control
PA2017-239
Ayude a prevenir
la contaminación del océano
Do your part to prevent
water pollution in our
creeks, rivers, bays and ocean.
Clean beaches and healthy
creeks, rivers, bays and ocean
are important to Orange County.
However, not properly disposing
of household hazardous waste can
lead to water pollution. Batteries,
electronics, paint, oil, gardening
chemicals, cleaners and other
hazardous materials cannot be
thrown in the trash. They also must
never be poured or thrown into
yards, sidewalks, driveways, gutters
or streets. Rain or other water could
wash the materials into the storm
drain and
eventually into
our waterways
and the ocean.
In addition,
hazardous
waste must not
be poured in
the sanitary
sewers (sinks
and toilets).
For more information,
please call the
Orange County Stormwater Program
at 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.
ORANGE COUNTY
Help Prevent Ocean Pollution:
Proper Disposal ofHouseholdHazardous Waste
The Ocean Begins atYour Front Door
Printed on Recycled Paper
NEVER DISPOSE
OF HOUSEHOLD
HAZARDOUS
WASTE IN THE
TRASH, STREET,
GUTTER,
STORM DRAIN
OR SEWER.
PA2017-239
Pollution Prevention
Leftover household products that contain
corrosive, toxic, ignitable, or reactive
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
San Juan 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 household 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 (thermometers & 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.
WHEN POSSIBLE,
USE
NON-HAZARDOUS
OR
LESS-HAZARDOUS
PRODUCTS.
PA2017-239
Do your part to prevent water
pollution in our creeks, rivers, bays
and ocean.
Clean beaches and healthy creeks, rivers,
bays, and ocean are important to Orange
County. However, many common household
activities can lead to
water pollution if you’re
not careful.
Litter, oil, chemicals and
other substances that
are left on your yard or
driveway can be blown
or washed into storm
drains that flow to the
ocean. Over-watering
your lawn and washing
your car can also flush
materials into the storm
drains. Unlike water in sanitary sewers
(from sinks and toilets), water in storm
drains is not treated.
You would never pour soap, fertilizers or oil
into the ocean, so don’t let them enter
streets, gutters or storm drains. Follow the
easy tips in this brochure to help prevent
water pollution.GENUINERECYCLEDPAPER
50% PRE-CONSUMERAND15% POST-CONSUMER
REMEMBER THE
WATER IN YOUR
STORM DRAIN
IS NOT TREATED
BEFORE
IT ENTERS OUR
WATERWAYS
The Ocean Begins at Your Front Door
For more information,
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 Problem
Reporting Hotline
1-877-89-SPILL (1-877-897-7455).
For emergencies, dial 911.
The tips contained in this brochure provide useful
information to help prevent water pollution while
performing everyday household activities. If you
have other suggestions, please contact your city’s
stormwater representatives or call the Orange
County Stormwater Program.
Help Prevent Ocean Pollution:
Household Tips
PA2017-239
Gardening Activities
�Follow directions on pesticides and
fertilizers, (measure, do not estimate
amounts) and do not use if rain is
predicted within 48 hours.
�Water your lawn and garden by hand to
control the amount of water you use. Set
irrigation systems to reflect seasonal
water needs. If water flows off your yard
and onto your driveway or sidewalk,
your system is over-watering.
�Mulch clippings or leave them on the
lawn. If necessary, dispose in a green
waste container.
�Cultivate your garden often to control
weeds.
Washing and Maintaining Your Car
�Take your car to a commercial car wash
whenever possible.
�Choose soaps, cleaners, or detergents
labeled “non-toxic,” “phosphate free” or
“biodegradable.” Vegetable and citrus-
based products are typically safest for
the environment, but even these should
not be allowed into the storm drain.
�Shake floor mats into a trash can or
vacuum to clean.
�Do not use acid-based wheel cleaners and
“hose off” engine degreasers at home.
They can be used at a commercial facility,
which can properly process the washwater.
�Do not dump washwater onto your
driveway, sidewalk, street, gutter or
storm drain.Excess washwater shouldbe disposed of in the sanitary sewers
(through a sink, or toilet) or onto an
absorbent surface like your lawn.
�Use a nozzle to turn off water when not
actively washing down automobile.
�Monitor vehicles for leaks and place
pans under leaks. Keep your car well
maintained to stop and prevent leaks.
�Use cat litter or other absorbents and
sweep to remove any materials deposited
by vehicles. Contain sweepings anddispose of at a HHWCC.
�Perform automobile repair and
maintenance under a covered area and
use drip pans or plastic sheeting to keep
spills and waste material from reaching
storm drains.
�Never pour oil or antifreeze in thestreet, gutter or storm drains.
Recycle these substances at a service
station, HHWCC, or used oil recycling
center. For the nearest Used Oil
Collection Center call 1-800-CLEANUP
or visit www.ciwmb.ca.gov/UsedOil.
Pollution Prevention
Household Activities
�Do not rinse spills with water!Sweep
outdoor spills and dispose of in the trash.
For wet spills like oil, apply cat litter or
another absorbent material, then sweep
and bring to a household hazardous waste
collection center (HHWCC).
�Securely cover trash cans.
�Take household hazardous waste to a house-
hold hazardous waste collection center.
�Store household hazardous waste in closed,
labeled containers inside or under a cover.
�Do not hose down your driveway, sidewalk or
patio. Sweep up debris and dispose of in trash.
�Always pick up after your pet. Flush waste
down the toilet or dispose of in the trash.
�Bathe pets indoors or have them
professionally groomed.
Household Hazardous Wastes include:
�Batteries
�Paint thinners, paint strippers and removers
�Adhesives
�Drain openers
�Oven cleaners
�Wood and metal cleaners and polishes
�Herbicides and pesticides
�Fungicides/wood preservatives
�Automotive fluids and products
�Grease and rust solvents
�Thermometers and other productscontaining mercury
�Fluorescent lamps
�Cathode ray tubes, e.g. TVs, computermonitors
�Pool and spa chemicals
For locations and hours of Household Hazardous Waste Collection Centers in Anaheim, Huntington
Beach, Irvine and San Juan Capistrano, call (714)834-6752 or visit www.oclandfills.com.
PA2017-239
Help Prevent Ocean Pollution:
For more information,
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 Problem
Reporting Hotline
at 1-877-89-SPILL (1-877-897-7455).
For emergencies, dial 911.
The tips contained in this brochure provide useful
information to help prevent water pollution. If
you have other suggestions, please contact your
city’s stormwater representatives or call the Orange
County Stormwater Program.
Printed on Recycled Paper
Tips for Residential
Pool, Landscape and
Hardscape Drains
PA2017-239
Pool Maintenance
All pool water discharged to the curb, gutter or
permitted pool drain from your property must meet the
following water quality criteria:
The residual chlorine does not exceed
0.1 mg/L (parts per
million).
The pH is between
6.5 and 8.5.
The water is free
of any unusual
coloration.
There is no discharge
of filter media or acid
cleaning wastes.
Some cities have ordinances that do not allow pool
water to be discharged to the storm drain. Check with
your city.
Landscape and
Hardscape Drains
The following recommendations will help reduce or
prevent pollutants from your landscape and hardscape
drains from entering the street, gutter or storm drain.
Unlike water that enters the sewer (from sinks and
toilets), water that enters a landscape or hardscape
drain is not treated before entering our creeks, rivers,
bays and ocean.
Household Activities
Do not rinse spills of materials or chemicals to any
drain.
Use dry cleanup methods such as applying cat
litter or another absorbent material, then sweep it
up and dispose of it in the trash. If the material is
hazardous, dispose of it at a Household Hazardous
Waste Collection Center (HHWCC). For locations,
call (714) 834-6752 or visit www.oclandfills.com.
Do not hose down your driveways, sidewalks or
patios to your landscape or hardscape drain.
Sweep up debris and dispose of it in the trash.
Always pick up after your pet. Flush waste down
the toilet or dispose of it in the trash.
Tips for Residential Pool, Landscape and Hardscape Drains
Do not store items such as cleaners, batteries,
automotive fluids, paint products, TVs, or
computer monitors uncovered outdoors. Take
them to a HHWCC for disposal.
Yard Maintenance
Do not overwater. Water by hand or set
automated irrigation systems to reflect seasonal
water needs.
Follow directions on
pesticides and fertilizers
(measure, do not estimate
amounts) and do not use
if rain is predicted within
48 hours.
Cultivate your garden
often to control weeds
and reduce the need to
use chemicals.
Vehicle Maintenance
Never pour oil or antifreeze down your
landscape or hardscape drain. Recycle these
substances at a service station, a waste collection
center or used oil recycling center. For
locations, contact the Used Oil Program at 1-800-
CLEANUP or visit www.CLEANUP.org.
Whenever possible, take your vehicle to a
commercial car wash.
If you do wash your vehicle at home, do not
allow the washwater to go down your landscape
or hardscape drain. Instead, dispose of it in
the sanitary sewer (a sink or toilet) or onto an
absorbent surface such as your lawn.
Use a spray nozzle that will shut off the water
when not in use.
PA2017-239
For More Information
Aliso Viejo (949) 425-2535
Anaheim Public Works Operations (714) 765-6860
Brea Engineering (714) 990-7666
Buena Park Public Works (714) 562-3655
Costa Mesa Public Services (714) 754-5323
Cypress Public Works (714) 229-6740
Dana Point Public Works (949) 248-3584
Fountain Valley Public Works (714) 593-4441
Fullerton Engineering Dept (714) 738-6853
Garden Grove Public Works (714) 741-5956
Huntington Beach Public Works (714) 536-5431
Irvine Public Works (949) 724-6315
La Habra Public Services (562) 905-9792
La Palma Public Works (714) 690-3310
Laguna Beach Water Quality (949) 497-0378
Laguna Hills Public Services (949) 707-2650
Laguna Niguel Public Works (949) 362-4337
Laguna Woods Public Works (949) 639-0500
Lake Forest Public Works (949) 461-3480
Los Alamitos Community Dev (562) 431-3538
Mission Viejo Public Works (949) 470-3056
Newport Beach, Code & Water
Quality Enforcement (949) 644-3215
Orange Public Works (714) 532-6480
Placentia Public Works (714) 993-8245
Rancho Santa Margarita (949) 635-1800
San Clemente Environmental Programs (949) 361-6143
San Juan Capistrano Engineering (949) 234-4413
Santa Ana Public Works (714) 647-3380
Seal Beach Engineering (562) 431-2527 x317
Stanton Public Works (714) 379-9222 x204
Tustin Public Works/Engineering (714) 573-3150
Villa Park Engineering (714) 998-1500
Westminster Public Works/Engineering (714) 898-3311 x446
Yorba Linda Engineering (714) 961-7138
Orange County Stormwater Program (877) 897-7455
Orange County 24-Hour
Water Pollution Problem Reporting Hotline
1-877-89-SPILL (1-877-897-7455)
On-line Water Pollution Problem Reporting Form
w w w o c w a t e r s h e d s c o m
The Ocean Begins
at Your Front Door
California Environmental Protection Agency
www calepa ca gov
• Air Resources Board
www arb ca gov
• Department of Pesticide Regulation
www cdpr ca gov
• Department of Toxic Substances Control
www dtsc ca gov
• Integrated Waste Management Board
www ciwmb ca gov
• Office of Environmental Health Hazard
Assessment
www oehha ca gov
• State Water Resources Control Board
www waterboards ca gov
Earth 911 - Community-Specific Environmental
Information 1-800-cleanup or visit www 1800cleanup
org
Health Care Agency’s Ocean and Bay Water Closure
and Posting Hotline
(714) 433-6400 or visit www ocbeachinfo com
Integrated Waste Management Dept. of Orange
County (714) 834-6752 or visit www oclandfills com for
information on household hazardous waste collection
centers, recycling centers and solid waste collection
O.C. Agriculture Commissioner
(714) 447-7100 or visit www ocagcomm com
Stormwater Best Management Practice Handbook
Visit www cabmphandbooks com
UC Master Gardener Hotline
(714) 708-1646 or visit www uccemg com Did You Know? Most people believe that the largest source of water pollution in urban areas comes from specific sources such as factories and sewage treatment plants In fact, the largest source of water pollution comes from city streets, neighborhoods, construction sites and parking lots This type of pollution is sometimes called “non-point source” pollution There are two types of non-point source pollution: stormwater and urban runoff pollution Stormwater runoff results from rainfall When rainstorms cause large volumes of water to rinse the urban landscape, picking up pollutants along the way Urban runoff can happen any time of the year when excessive water use from irrigation, vehicle washing and other sources carries trash, lawn clippings and other urban pollutants into storm drains Where Does It Go? Anything we use outside homes, vehicles and businesses – like motor oil, paint, pesticides, fertilizers and cleaners – can be blown or washed into storm drains A little water from a garden hose or rain can also send materials into storm drains Storm drains are separate from our sanitary sewer systems; unlike water in sanitary sewers (from sinks or toilets), water in storm drains is not treated before entering our waterways Printed on Recycled Paper
The Orange County Stormwater Program has created
and moderates an electronic mailing list to facilitate
communications, take questions and exchange ideas among
its users about issues and topics related to stormwater and
urban runoff and the implementation of program elements
To join the list, please send an email to
ocstormwaterinfo-join@list ocwatersheds com
Orange County Stormwater Program Even if you live miles from the Pacific Ocean, you may be unknowingly polluting it.Sources of Non-Point Source Pollution Automotive leaks and spills Improper disposal of used oil and other engine fluids Metals found in vehicle exhaust, weathered paint, rust, metal plating and tires Pesticides and fertilizers from lawns, gardens and farms Improper disposal of cleaners, paint and paint removers Soil erosion and dust debris from landscape and construction activities Litter, lawn clippings, animal waste, and other organic matter Oil stains on parking lots and paved surfaces The Effect on the OceanNon-point source pollution can have a serious impact on water quality in Orange County Pollutants from the storm drain system can harm marine life as well as coastal and wetland habitats They can also degrade recreation areas such as beaches, harbors and bays Stormwater quality management programs have been developed throughout Orange County to educate and encourage the public to protect water quality, monitor runoff in the storm drain system, investigate illegal dumping and maintain storm drains Support from Orange County residents and businesses is needed to improve water quality and reduce urban runoff pollution Proper use and disposal of materials will help stop pollution before it reaches the storm drain and the ocean Dumping one quart of motor oil into a storm drain can contaminate 250,000 gallons of water. PA2017-239
Follow these simple steps to help reduce water
pollution:
Household Activities
Do not rinse spills with water Use dry cleanup
methods such as applying cat litter or another
absorbent material, sweep and dispose of in
the trash Take items such as used or excess
batteries, oven cleaners, automotive fluids,
painting products and cathode ray tubes, like
TVs and computer monitors, to a Household
Hazardous Waste Collection Center (HHWCC)
For a HHWCC near you call (714) 834-6752 or
visit www oclandfills com
Do not hose down your driveway, sidewalk or
patio to the street, gutter or storm drain Sweep
up debris and dispose of it in the trash
Automotive
Take your vehicle to a commercial car
wash whenever possible If you wash your
vehicle at home, choose soaps, cleaners, or
detergents labeled non-toxic, phosphate- free
or biodegradable Vegetable and citrus-based
products are typically safest for the environment
Do not allow washwater from vehicle washing
to drain into the street, gutter or storm drain
Excess washwater should be disposed of in the
sanitary sewer (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 antifreeze in the street, gutter
or storm drain Recycle these substances at a
service station, a waste oil collection center or
used oil recycling center For the nearest Used
Oil Collection Center call 1-800-CLEANUP or
visit www 1800cleanup org
Never allow pollutants to enter the
street, gutter or storm drain!
Lawn and Garden
Pet and animal waste
Pesticides
Clippings, leaves and soil
Fertilizer
Common Pollutants
Automobile
Oil and grease
Radiator fluids and antifreeze
Cleaning chemicals
Brake pad dust
Home Maintenance
Detergents, cleaners and solvents
Oil and latex paint
Swimming pool chemicals
Outdoor trash and litter
The Ocean Begins at Your Front Door
Trash
Place trash and litter that cannot be recycled in
securely covered trash cans
Whenever possible, buy recycled products
Remember: Reduce, Reuse, Recycle
Pet Care
Always pick up after your pet Flush waste down
the toilet or dispose of it in the trash Pet waste,
if left outdoors, can wash into the street, gutter
or storm drain
If possible, bathe your pets indoors If you must
bathe your pet outside, wash it on your lawn or
another absorbent/permeable surface to keep
the washwater from entering the street, gutter or
storm drain
Follow directions for use of pet care products
and dispose of any unused products at a
HHWCC
Pool Maintenance
Pool and spa water must be dechlorinated and free
of excess acid, alkali or color to be allowed in the
street, gutter or storm drain
When it is not raining, drain dechlorinated pool and
spa water directly into the
sanitary sewer
Some cities may have ordinances that do not allow
pool water to be disposed of in the storm drain
Check with your city
Landscape and Gardening
Do not over-water Water your lawn and garden by
hand to control the amount of water you use or set
irrigation systems to reflect seasonal water needs
If water flows off your yard onto your driveway or
sidewalk, your system is over-watering 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 waste by composting, hauling it to a
permitted landfill, or as green waste through your
city’s recycling program
Follow directions on pesticides and fertilizer,
(measure, do not estimate amounts) and do not use
if rain is predicted within 48 hours
Take unwanted pesticides to a HHWCC to be
recycled For locations and hours of HHWCC, call
(714) 834-6752 or visit www oclandfills com
PA2017-239
ATTACHMENT C
Reference Exhibits of O.C. Technical Guide Document
PA2017-239
P:\9526E\6-GIS\Mxds\Reports\InfiltrationFeasability_20110215\9526E_FigureXVI-3d_NewportBaySusceptibility_20100430.mxdSanta Ana RiverWatershedSanta Ana RiverWatershedSouth OrangeCountyAnaheim Bay-Huntington HarborWatershedJohnWayneAirportLOWER PETERSCANYON RETARDINGBASINHICKS CANYONRETARDINGBASINSIPHONRESERVOIRROUND CANYONRETARDINGBASINBEE CANYONRETARDINGBASINEASTFOOTRETARDINGBASINORCHARD ESTATESRETENTION BASINAGUA CHINONRETARDINGBASINVILLAGEPOND PARKSAND CANYONRESERVOIRSAN JOAQUINRESERVOIRLAGUNARESERVOIRBIG CANYONRESERVOIRBONITACANYONRESERVOIRBASINNUMBER 1NORTHLAKESOUTHLAKEBASINNUMBER 2EL MODENA-IRVINERETARDING BASINHARBORVIEW DAMEAST HICKSCANYONRETARDING BASINRATTLESNAKERESERVOIRTRABUCORETARDINGBASINMARSHBURNRETARDINGBASINFIGUREXVI-3dJOBTITLESCALE1" = 4000'DESIGNEDDRAWINGCHECKEDBMP04/30/10DATEJOB NO.9526-ETHTHORANGE COUNTYWATERSHEDMASTER PLANNINGORANGE CO.CASUSCEPTIBILITY ANALYISNEWPORT BAY-NEWPORT COASTAL STREAMS!I08,00016,0004,000FeetSusceptibilityPotential Areas of Erosion, Habitat, &Physical Structure SusceptibilityChannel TypeEarth (Unstable)Earth (Stabilized)StabilizedTidel Influence<= Mean High Water Line (4.28')Water BodyBasinDamLakeReservoirOther LandsAirport/MilitaryPRELIMINARY MAPSUBJECT TO FURTHER REVISIONPA2017-239
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ORANGE COUNTYORANGE COUNTYSAN BERNARDINO COUNTYSAN BERNARDINO COUNTYORANGE COUNTYORANGE COUNTYLOS ANGELES COUNTYLOS ANGELES COUNTYORANGE COUNTYORANGE COUNTYLOS ANGELES COUNTYLOS ANGELES COUNTYP:\9526E\6-GIS\Mxds\Reports\InfiltrationFeasability_20110215\9526E_FigureXVI-2a_HydroSoils_20110215.mxdFIGUREXVI-2aJOBTITLESCALE1" = 1.8 milesDESIGNEDDRAWINGCHECKEDBMP02/09/11DATEJOB NO.9526-ETHTHORANGE COUNTYINFILTRATION STUDYORANGE CO.CANRCS HYDROLOGICSOILS GROUPSSUBJECT TO FURTHER REVISIONSource: Soils: Natural Resources Conservation Service (NRCS)Soil Survey - soil_ca678, Orange County & Western RiversideDate of publication: 2006-02-08!I03.67.21.8Miles05102.5KilometersLEGENDCity BoundariesHydrologic Soil GroupsA SoilsB SoilsC SoilsD Soilshttp://websoilsurvey.nrcs.usda.gov/app/HomePage.htmPA2017-239
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ORANGE COUNTYORANGE COUNTYSAN BERNARDINO COUNTYSAN BERNARDINO COUNTYORANGE COUNTYORANGE COUNTYLOS ANGELES COUNTYLOS ANGELES COUNTYORANGE COUNTYORANGE COUNTYLOS ANGELES COUNTYLOS ANGELES COUNTY1.050.71
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0.950.70.90.90.75P:\9526E\6-GIS\Mxds\Reports\InfiltrationFeasability_20110215\9526E_FigureXVI-1_RainfallZones_20110215.mxdFIGUREJOBTITLESCALE1" = 1.8 milesDESIGNEDDRAWINGCHECKEDBMP04/22/10DATEJOB NO.9526-ETHTHORANGE COUNTYTECHNICAL GUIDANCEDOCUMENTORANGE CO.CARAINFALL ZONESSUBJECT TO FURTHER REVISION03.67.21.8Miles06123KilometersLEGENDOrange County Precipitation Stations24 Hour, 85th Percentile Rainfall (Inches)24 Hour, 85th Percentile Rainfall (Inches) - ExtrapolatedCity BoundariesRainfall ZonesDesign Capture Storm Depth (inches)0.65"0.70.750.800.850.900.951.001.10"Note: Events defined as 24-hour periods (calendar days) with greater than 0.1 inches of rainfall. For areas outside of available data coverage, professional judgment shall be applied.XVI-1PA2017-239