HomeMy WebLinkAboutX2018-1903 - Soils (2)X701 g_)g03
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engineering
geotechnical
applications
consultants
June 21, 2019
Project No. SB102.2
CITY OF NEWPORT BEACH
Building Department
100 Civic Center Drive
Newport Beach, CA 92660
Subject: FINAL GRADING CERTIFICATE
HARDSCAPE COMPACTION, UTILITY TRENCH BACKFILL
AT NEW RESIDENTIAL PROPERTY LOCATED at
309 CORONADO STREET
NEWPORT BEACH, CALIFORNIA
City of Newport Beach Permit No.: 1486-2018
References:
1. "Geotechnical Investigation for Proposed, Residential Development Located at 309 Coronado Street,
Newport Beach, California," by EGA Consultants dated April 3, 2018.
2. "Structural Plans for New 3 Story 3 Bedroom House, 309 Coronado Street, Newport Beach, CA 92661," by
Paul Rohrer Structural Engineers and JJAB Design, LLC., dated July 30, 2018.
3. "Grading Plans for Proposed Residence, 309 Coronado St., Newport Beach, CA 92661," by D'ZN
Engineering dated June 18, 2018.
4. "Response Memorandum: Stormwater Infiltration and Drain Devices at Proposed Residence Located at 309
Coronado Street, Newport Beach, California," by EGA Consultants, Inc., dated August 1, 2018.
5. "Compaction Report for Placement of Fill within Limits of Residential Building Pad at 309 Coronado Street,
Newport Beach, California," by EGA Consultants, dated September 4, 2018.
To City Building/Grading Officials
In accordance with the City of Newport Beach building requirements, we are submitting this
compaction report for the grading of the subject building pad. This report includes the test
results performed at the subject lot during the placement of on-site soil material in the area of
the proposed residential building pad. The site earthworks operations were performed by the
sub -contractor, Tight Quarters, Inc.
Excavation and grading of the subject lot commenced on August 24, 2018 and was complete by
August 27, 2018. To date, site grading included the removal of the upper 2Yz feet (plus 6"
scarification) of the old fill and native material located within the limits of the proposed building
pad and exterior improvements. All flatwork subgrade was completed by June 13, 2019.
Prior to the placement of fill, the excavation bottoms were inspected and approved by a
Certified Engineering Geologist employed by EGA Consultants. The exposed surface was
scarified, moisture conditioned and recompacted to a minimum of 90% relative compaction.
For cohesion -treatment, 2 (two) pallets (each pallet contains 35 bags each weighing 94 pounds)
of Portland Cement were blended into the newly -placed fill. Additionally, a silty sand import
material was uniformly placed and compacted to cap the upper approximately 12 inches of the
newly graded pad.
375-C Monte Vista Avenue • Costa Mesa, CA 92627 • (949) 642-9309 • FAX (949) 642-1290
One Kubota SVL 90-2 front loader, one jumping -jack wacker, one vibratory plate, and water
hoses were utilized for the purposes of compaction and grading control.
Field density test results are tabulated on Table 1, Summary of Field Density Tests.
All earthwork operations were performed under continuous observations by this firm and were
performed in accordance with geotechnical specifications outlined in the soils report dated April
3, 2018.
I certify that all grading and compaction work was done in compliance with the soils report for
this project and the work complies with City of Newport Beach grading regulations. All soils
values and geotechnical specifications outlined in the soils report remain valid.
Based on our continuous observations and testing, the subject and adjacent sites are not
impacted by the site grading operations to date.
This opportunity to be of service is appreciated. If you have any questions, please call.
Very truly yours,
ECA Consultants, Inc.
(;'
r,�i DWoDAVID A. WORTHINGTON CEG 2124 Wo.G20Principal Engineering Geologist21
nEG. ENGINEERING
cc, (1) Addressee
(1) Brent Sepulveda
FINAL COMPACTION REPORT:
309 Coronado Street, Newport Beach, CA
Project No. SB102.2
June 21, 2019
TABLE 1
SUMMARY OF MOISTURE DENSITY RELATIONSHIPS
(ASTM: D1556)
Sample
Depth
Dry
Moisture
Maximum
Optimum
Relative
Number/
Below
Density
Content
Density
Moisture
Compaction
Location
Grade
(PCF)
(e/d)
(PCF)
N
(°/a)
(ft)
FD -1
2.5
98.8
10.6
106.0
10.5
93
N. Central
Bldg. Pad
FD -2
2.0
97.6
10.8
106.0
10.5
92
N. West
Bldg. Pad
FD -3
1.5
99.9
10.7
106.0
10.5
94
N. East
Bldg. Pad
FD -4
1.0
101.0
10.5
106.0
10.5
95
N. Central
Bldg. Pad
FD -5
2.5
97.6
11.0
106.0
10.5
92
N. Edge
Bldg, Pad
FD -6
2.0
99.7
10.8
106.0
10.5
94
S. West
Bldg. Pad
FD -7
1.5
98.8
10.7
106.0
10.5
93
S. East
Bldg. Pad
FD -8
1.0
101.2
10.6
106.0
10.5
95
S Central
Bldg. Pad
FD -9
0.5
101.8
11.2
108.0
11.0
94
W. Central
Bldg. Pad
FD -10
0.5
104.2
11.8
108.0
11.0
96
E. Central
Bldg. Pad
FD -11
FG
103.0
11.4
108.0
11.0
95
N. Central
Bldg. Pad
FD -12
FG
101.8
11.6
108.0
11.0
94
S. Central
Bldg. Pad
FINAL COMPACTION REPORT:
309 Coronado Street, Newport Beach, CA
Project No. SB102.2
June 21, 2019
FD -13
FG
102.7
11.2
108.0
11.0
95
SEC Bldg.
%n
Fill/Native - Beach Sands
106.0
10.5
Per Soils Report dated April 3, 2018
Pad
Import -
108.0
11.0
Silty Sand with trace gravel
FD -14
FG
102.8
11.5
108.0
11.0
95
SWC Bldg.
Pad
FD -15
FG
104.0
11.2
108.0
11.0
96
Central
Bldg. Pad
FD -16
FG
102.9
11.1
108.0
11.0
95
Garage
Pad
FD -17
FG
97.6
12.8
108.0
11.0
90
Util Trench
Backfill
FD -18
FG
101.5
11.7
108.0
11.0
94
Hardscape
FD -19
FG
101.2
11.3
108.0
11.0
94
Hardscape
FD -20
FG
105.6
11.4
108.0
11.0
98
Approach
FD" = Field Density Test
FG' = Finish Grade (Ground Level Pad)
TABLE 2
SUMMARY OF MAXIMUM DENSITY TEST
(ASTM D 1557)
Sample
Maximum
Optimum
Location
Density
Moisture
Pc
%n
Fill/Native - Beach Sands
106.0
10.5
Per Soils Report dated April 3, 2018
Import -
108.0
11.0
Silty Sand with trace gravel
FINAL COMPACTION REPORT:
309 Coronado Street, Newport Beach, CA
Project No. SB102.2
June 21, 2019
consultants
engineering
geotechnical
applications
CITY OF NEWPORT BEACH
Building Department
100 Civic Center Drive
Newport Beach, CA 92660
September 4, 2018
Project No. SB102.2
Subject: COMPACTION REPORT FOR PLACEMENT OF FILL
WITHIN LIMITS OF RESIDENTIAL BUILDING PAD AT
309 CORONADO STREET
NEWPORT BEACH, CALIFORNIA
City of Newport Beach Permit No.: 1486-2018
References:
1. "Geotechnical Investigation for Proposed, Residential Development Located at 309 Coronado Street,
Newport Beach, California," by EGA Consultants dated April 3, 2018.
2. "Structural Plans for New 3 Story 3 Bedroom House, 309 Coronado Street, Newport Beach, CA 92661," by
Paul Rohrer Structural Engineers and JJAB Design, LLC., dated July 30, 2018.
3. "Grading Plans for Proposed Residence, 309 Coronado St., Newport Beach, CA 92661," by D'ZN
Engineering dated June 18, 2018.
4. "Response Memorandum: Stormwater Infiltration and Drain Devices at Proposed Residence Located at 309
Coronado Street, Newport Beach, California," by EGA Consultants, Inc., dated August 1, 2018.
To City Building/Grading Officials:
In accordance with the City of Newport Beach building requirements, we are submitting this
compaction report for the grading of the subject building pad. This report includes the test
results performed at the subject lot during the placement of on-site soil material in the area of
the proposed residential building pad. The site earthworks operations were performed by the
sub -contractor, Tight Quarters, Inc.
Excavation and grading of the subject lot commenced on August 24, 2018 and was complete by
August 27, 2018. To date, site grading included the removal of the upper 2'/ feet of the old fill
and native material located within the limits of the proposed building pad. The lot was roughly
divided into halves, excavated and recompacted to bring the entire lot to finished subgrade.
One Kubota SVL 90-2 was utilized for the purpose of compaction and grading control. On site
soils were moisture treated via a 2 -inch diameter water hose during the grading process to
bring the moisture content to near -optimum.
For cohesion -treatment, 2 (two) pallets (each pallet contains 35 bags each weighing 94 pounds)
of Portland Cement were blended into the newly -placed fill. Additionally, a silty sand import
material was uniformly placed and compacted to cap the upper approximately 12 inches of the
newly graded pad.
Prior to the placement of fill, the excavation bottoms were inspected and approved by a
Certified Engineering Geologist employed by EGA Consultants. The exposed surface was
scarified, moisture conditioned and recompacted to a minimum of 90% relative compaction.
Field density test results are tabulated on Table 1, Summary of Field Density Tests.
375-C Monte Vista Avenue • Costa Mesa, CA 92627 • (949) 642-9309 • FAX (949) 642-1290
All earthwork operations were performed under continuous observations by this firm and were
performed in accordance with geotechnical specifications outlined in the soils report dated April
3, 2018.
The building pad was graded in accordance with the 2016 CBC and the City of Newport Beach
Building standards and are approved for construction. Based on our continuous observations
and testing, the subject and adjacent sites are not impacted by the site grading operations to
date.
This report includes the test results performed at the subject site during the placement of on-
site soil material in the area of the proposed building pad. Additional observations and
testing are required in areas to receive exterior improvements (driveway approach, patio
flatwork, etc.) and utility trench backfill.
I certify that all rough grading work was done in compliance with the above -referenced Soils
Report and the work complies with City of Newport Beach grading regulations. All soils values
and geotechnical specifications outlined in the above -referenced soils report remain valid.
This opportunity to be of service is appreciated. If you have any questions, please call
Very truly yours,
EGA Consultants, Inc.
DAVID A. WORTHINGTON CEG 2124
Principal Engineering Geologist
Copies: (1) Addressee
(1) Brent Sepulveda
PAD CERTIFICATION REPORT;
309 Coronado Street, Newport Beach, CA
Project No. SB102.2
September 4, 2018
TABLE 1
SUMMARY OF MOISTURE DENSITY RELATIONSHIPS
(ASTM: D1556)
Sample
Depth
Dry
Moisture
: Maximum
Optimum
Relative
Number/
Below
Density
Content
Density
Moisture
Compaction
Location
Grade
(PCF)
N
(PCF)
N
N
ft
FD -1
2.5
98.8
10.6
106.0
10.5
93
N. Central
Bldg. Pad
FD -2
2.0
97.6
10.8
106.0
10.5
92
N. West
Bldg. Pad
FD -3
1.5
99.9
10.7
106.0
10.5
94
N. East
Bldg. Pad
FD -4
1.0
101.0
10.5
106.0
10.5
95
N. Central
Bldg. Pad
FD -5
2.5
97.6
11.0
106.0
10.5
92
N. Edge
Bldg, Pad
FD -6
2.0
99.7
10.8
106.0
10.5
94
S. West
Bldg. Pad
FD -7
1.5
98.8
10.7
106.0
10.5
93
S. East
Bldg. Pad
FD -8
1.0
101.2
10.6
106.0
10.5
95
S Central
Bldg. Pad
FD -9
0.5
101.8
11.2
108.0
11.0
94
W. Central
Bldg. Pad
FD -10
0.5
104.2
11.8
108.0
11.0
96
E. Central
Bldg. Pad
FD -11
FG
103.0
11.4
108.0
11.0
95
N. Central
Bldg. Pad
FD -12
FG
101.8
11.6
108.0
11.0
94
S. Central
11 Bldg. Pad
PAD CERTIFICATION REPORT:
309 Coronado Street, Newport Beach, CA
Project No. SB102.2
September 4, 2018
FD -13
FG
102.7
11.2
108.0
11.0
95
SEC Bldg.
P/o,
Fill/Native - Beach Sands
106.0
10.5
Per Soils Report dated 4/3/18
Pad
Import - Silty Sand with trace
108.0
11.0
gravel
FD -14
FG
102.8
11.5
108.0
11.0
95
SWC Bldg.
Pad
FD -15
FG
104.0
11.2
108.0
11.0
96
Central
Bldg. Pad
FD -16
FG
102.9
11.1
108.0
11.0
95
Garage
Pad
"FD" = Field Density Test
"FG" = Finish Grade (Ground Level Pad)
TABLE 2
SUMMARY OF MAXIMUM DENSITY TEST
(ASTM D 1557)
Sampler
Maximum
Optimum
Location
Density
Moisture
Po
P/o,
Fill/Native - Beach Sands
106.0
10.5
Per Soils Report dated 4/3/18
Import - Silty Sand with trace
108.0
11.0
gravel
PAD CERTIFICATION REPORT:
308 Coronado Street, Newport Beach, CA
Project No. SB102.2
September 4, 2018