HomeMy WebLinkAbout1.01_Rough Grade Report_RG Report Phase 1
ROUGH GRADE COMPACTION REPORT
HARBOR DAY SCHOOL—PHASE 1
3443 Pacific View Drive
Corona Del Mar, California
for
Harbor Day School
22885 Savi Ranch Parkway Suite E Yorba Linda California 92887
voice: (714) 685-1115 fax: (714) 685-1118 www.socalgeo.com
August 31, 2020
Harbor Day School, A Non-Profit California Corporation
3443 Pacific View Drive
Corona del Mar, California 92625
Attention: Ms. Angela Evans
Project No.: 20M132-1
Subject: Rough Grade Compaction Report
Harbor Day School—Phase 1
3443 Pacific View Drive
Corona del Mar, California
References: 1) Geotechnical Investigation, Harbor Day School—Phase 1, 3443 Pacific View
Drive, Corona Del Mar, California, prepared for Harbor Day School by Southern
California Geotechnical, Inc. (SCG), SCG Project No. 18G161-3R, dated February
17, 2020.
2) Supplementary Geotechnical Investigation – Drilled Pier Design and Stairway
Recommendations, Harbor Day School—Phase 1, 3443 Pacific View Drive, Corona
Del Mar, California, prepared for Harbor Day School by Southern California
Geotechnical, Inc. (SCG), SCG Project No. 18G161-4, dated January 7, 2020.
Dear Ms. Evans:
We are pleased to present this Rough Grade Compaction Report which serves as a summary of
the grading observation and testing performed by our personnel during rough/remedial grading
operations for the proposed Harbor Day School—Phase 1 project.
PROJECT DESCRIPTION
The subject site is located at the street address of 3443 Pacific View Drive in Corona Del Mar,
California. The site is bounded to the south by San Joaquin Hills Road, to the west by apartment
buildings, to the north by Pacific View Drive, and to the east by a cemetery.
Harbor Day School consists of a roughly trapezoidal shaped property approximately 5.86 acres in
size. The site was previously developed with several structures that are part of the existing school
facility, primarily located in the central region of the site. We understand that the main school
building was constructed between 1971 and 1972. The buildings are assumed to be of wood
frame and stucco construction and supported on conventional shallow foundations with concrete
slab-on-grade floors. The gymnasium was a structure of tilt-up concrete construction, supported
on a combination of shallow foundations and drilled piers. A large sports field was located in the
western region of the site and a smaller sports field was located in the southeastern region of the
site. The ground surface surrounding the building areas consisted of asphaltic concrete in the
parking lot and basketball courts, and turf grass in the sports field areas. Several landscape
planters were also present around the buildings and parking areas. All but two of the existing
buildings were demolished prior to the current phase of construction. The overall site topography
Harbor Day School—Phase 1 – Corona Del Mar, CA Project No. 20M132-1
Page 2
sloped gently downward to the southeast at a gradient of less than 1± percent with some local
various in the site topography.
As part of the Phase 1 development, the gymnasium and the adjacent 6,400± ft2 school building
were demolished. A relatively small 2,000± ft2 school building located immediately southwest of
the main school building was also demolished. The two largest existing school buildings, located
in the eastern and northeastern areas of the site, remained in place during the Phase 1
construction.
The new building will be a U-shaped structure with overall dimensions of 250± feet by 270± feet.
The building will be located in the southwestern region of the property. We understand that the
new building will be a two-story structure used to house administration offices, classrooms, a
theatre, and the gymnasium. The proposed improvements will also include a quad area located
adjacent to the new building and a large sports field located in the southeastern region of the
site. Some areas of new Portland cement concrete flatwork, landscape planters, and automobile
drive lanes are anticipated.
PREVIOUS STUDIES
Southern California Geotechnical, Inc. (SCG) previously conducted a geotechnical investigation
for the proposed development. The results of this investigation were presented in reference 1,
listed above. The subsurface exploration conducted by SCG for this project consisted of five (5)
borings advanced to depths ranging from 15 to 25 feet below the existing site grades.
Existing fill soils were encountered at the boring locations, extending to depths ranging from 2½
to 6½± feet. The fill soils generally consisted of stiff to very stiff silty and sandy clays and medium
dense silty to clayey fine sands. Native alluvial soils were encountered beneath the existing fill
soils at one location. The alluvial soils generally consisted of medium stiff silty clay. Terrace
deposits were also encountered at most of the boring locations, beneath the fill soils or alluvium.
The terrace deposits generally consisted of medium dense to dense silty to clayey fine sands and
stiff to very stiff silty to sandy clays. The terrace deposits extended to depths of 6½± to 12± feet
at the boring locations. Bedrock was encountered at all of the boring locations between depths
of 6½ to 25± feet (the maximum depth explored). Generally, the bedrock consists of very stiff
to hard silty claystone and medium dense to very dense silty fine-grained sandstone that was
friable, weathered, and weakly cemented.
Based upon the conditions identified, it was recommended that the building pad area be
overexcavated so as to remove all of the existing fill soils. It was also recommended that the
building pad be overexcavated to a minimum depth of 3 feet below the proposed finished pad
grade. Foundation influence zones were recommended to be overexcavated to a depth of 2 feet
below bearing grade. Foundations were recommended to be designed for a maximum allowable
soil bearing pressure of 2,500 lbs/ft2.
SCG also prepared a supplementary report in order to provide drilled pier foundation design and
stairway recommendations. Based on the expected deeper fills discussed in the Reference 2
report, recommendations were provided to support the southern portion of the building on drilled
Harbor Day School—Phase 1 – Corona Del Mar, CA Project No. 20M132-1
Page 3
piers. Recommendations for the design and construction of the combination of drilled piers and
shallow spread footings were provided in the referenced SCG geotechnical reports.
SUMMARY OF EARTHWORK OPERATIONS AND TESTING
Rough/remedial grading operations for Phase 1 were initiated on July 30, 2020 and were
completed on August 21, 2020. The proposed building pad area was overexcavated to at least
the minimum depths recommended in the referenced geotechnical reports. Removal activities
resulted in the pad area being overexcavated to depths ranging from 3 to 7½± feet below the
proposed pad grade. Deeper removals of 12± feet were required in isolated areas due to
undocumented fills and/or organic material in the soils that were encountered during grading.
The southern portion of the building will be supported on drilled pier foundations, therefore
complete removal of the existing fill soils was not considered necessary based on the
recommendations provided in Reference 2, listed above. The overexcavation was extended
laterally at least 5 feet beyond the building and foundation perimeters. Foundations for the site
walls and stairs were also overexcavated to at least the minimum depths recommended in the
referenced geotechnical reports. The approximate limits of the building pad overexcavation are
indicated on the enclosed Density Test Location Plan (Plate 1).
The native soils exposed at the base of each overexcavation were proofrolled with fully loaded
Caterpillar 623B scrapers while being observed by a representative of SCG. The overexcavation
subgrades were found to be firm and unyielding and were approved for placement of structural
compacted fill. Prior to filling, subgrade soils were scarified to a depth of 12± inches, moisture
conditioned, and then recompacted. The excavated building pad, site wall footings, and stair
areas were then backfilled with compacted structural fill to reach finished grade.
Fill materials consisted of on-site soils which were placed in thin (approximately 6 to 8 inch thick)
horizontal lifts, moisture treated, and compacted. The results of compaction testing performed at
discrete, randomly selected locations indicated that at least 90 percent of the ASTM D-1557
maximum dry density was achieved at the test locations. The final 1 foot of fill placed within the
building pad area was compacted to at least 95 percent of the ASTM D-1557 maximum density.
Structural fill compaction was tested by the Nuclear Method (ASTM D-6938), referenced to the
maximum dry density values obtained by the Modified Proctor Method (ASTM D-1557). Where
density tests indicated less than the minimum specified compaction, the soils were moisture
treated as necessary and recompacted until the specified compaction was achieved as indicated
by retests. The locations of the density tests are indicated on the enclosed Density Test Location
Plan, Plate 1. Moisture-density test results are presented on Table 1, enclosed in this report. In
addition, data regarding the soil types used as structural fill are presented on Table 2.
Harbor Day School—Phase 1 – Corona Del Mar, CA Project No. 20M132-1
Page 4
LABORATORY TESTING
Soluble Sulfates
Representative samples of the on-site soils were collected during the geotechnical investigation
and were tested for soluble sulfate content. The results of this testing indicated sulfate
concentrations ranging from of 0.007 to 0.071 percent, which represent a negligible level of
soluble sulfates. Additional samples of the soils used for fill were obtained from the completed
building pad and submitted for sulfate testing. The results of the additional testing will be
documented in an addendum letter when they become available. Since only on-site soils were
used for fill in the building pad area, the forthcoming results are also anticipated to reflect
negligible sulfate contents.
Expansion Index
Expansion index testing was performed on two (2) representative samples of the fill soils obtained
from the completed building pad. This testing was performed in general accordance with ASTM
test method D-4829. The results of the EI testing are as follows:
Sample Identification Expansion Index Expansive Potential
Finished Pad – North 31 Low
Finished Pad – South 34 Low
The results of the EI testing performed as part of the referenced geotechnical report indicated a
low to medium expansive potential for the on-site soils. The foundation and floor slab design
recommendations presented in the project geotechnical report were made in consideration of the
low to medium expansive potential of the on-site soils. It is, therefore, recommended that the
floor slab subgrade soils be moisture conditioned to 2 to 4 percent over the optimum moisture
content to a depth of at least 12 inches.
CONCLUSIONS AND RECOMMENDATIONS
Geotechnical observation and testing indicate that the building pad, as rough graded, was
completed in accordance with recommendations presented in the referenced geotechnical
engineering reports and the applicable building codes. The building pad is expected to provide
adequate support for the proposed structure. The recommendations contained within the
referenced geotechnical report are considered appropriate for construction of the foundations
and floor slabs for the new structure.
During rough grading, the floor slab and foundation soils were properly moisture conditioned to
2 to 4 percent above the Modified Proctor optimum, to a depth of at least 12 inches below bearing
grade. Since it is typically not feasible to increase the moisture content of the floor
slab and foundation subgrade soils once rough grading has been completed, care
should be taken to maintain the moisture content of the building pad subgrade soils
throughout the construction process.
Harbor Day School—Phase 1 – Corona Del Mar, CA Project No. 20M132-1
Page 5
FUTURE EARTHWORK OBSERVATION AND TESTING
It is recommended that the geotechnical engineer be contacted to perform additional earthwork
observation and testing during the following phases of the project:
• Drilled Pier Inspection
• Foundation Excavation
• Utility Trench Backfill
• Retaining Wall Backfill
• Subgrade Preparation in New Pavement Areas
• Aggregate Base Placement in New Pavement Areas
CLOSURE
This opportunity to be of continued professional service is sincerely appreciated. Should you have
any questions regarding the information contained herein, please contact us at your earliest
convenience.
Respectfully Submitted,
SOUTHERN CALIFORNIA GEOTECHNICAL, INC.
Oscar Sandoval
Staff Engineer
Gregory K. Mitchell, GE 2364
Principal Engineer
Enclosures: Density Test Location Plan, Plate 1
Summary of Field Density Tests, Table 1
Summary of Moisture-Density Relationships, Table 2
Distribution: (1) Addressee
APPROXIMATE
STAIR LOCATION
APPROXIMATE
STAIR LOCATION
BASE MAP PREPARED BY WALDEN & ASSOCIATES
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APPROXIMATE LOCATION OF IN-PLACE DENSITY TEST
APPROXIMATE ELEVATION AT BOTTOM OF OVEREXCAVATION
APPROXIMATE LIMITS OF BUILDING PAD OVEREXCAVATION
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TABLE 1
SUMMARY OF FIELD DENSITY TESTS
Test No.Date Elev.Test Soil Moisture Dry Density Relative Comments
(ft)Location Type Content (pcf)Compaction
(%)(%)
1 30-Jul-20 303.5 Site Wall A 15.3 107.6 90 B.O.X.
2 30-Jul-20 304.5 Site Wall A 15.4 108.8 91
3 30-Jul-20 305.0 Site Wall A 11.9 106.4 89 Fail: 90% Required
4 30-Jul-20 305.0 Site Wall A 15.1 110.1 92 Retest #3
5 30-Jul-20 306.0 Site Wall A 16.6 107.5 90
6 30-Jul-20 307.0 Site Wall C 16.2 108.6 90
7 30-Jul-20 303.5 Site Wall A 16.4 107.5 90 B.O.X.
8 30-Jul-20 304.5 Site Wall A 17.6 105.0 88 Fail: 90% Required
9 30-Jul-20 304.5 Site Wall A 15.8 107.8 90 Retest #8
10 30-Jul-20 308.0 Site Wall C 15.4 108.6 90
11 30-Jul-20 305.5 Site Wall A 14.5 105.9 88 Fail: 90% Required
12 30-Jul-20 305.5 Site Wall A 15.3 109.3 91 Retest #11
25 03-Aug-20 304.0 Site Wall F 13.3 110.4 90 B.O.X.
26 03-Aug-20 305.0 Site Wall F 13.6 110.1 90
27 03-Aug-20 304.5 Site Wall F 12.9 111.2 90
28 03-Aug-20 306.0 Site Wall F 13.3 110.6 90
29 03-Aug-20 306.5 Site Wall F 14.1 109.3 89 Fail: 90% Required
30 03-Aug-20 306.5 Site Wall F 13.5 110.8 90 Retest #29
31 03-Aug-20 307.5 Site Wall A 15.2 108.0 90
42 04-Aug-20 306.0 Site Fill E 12.7 110.1 90 B.O.X.
43 04-Aug-20 306.5 Site Fill E 11.7 108.1 88 Fail: 90% Required
44 04-Aug-20 306.5 Site Fill E 11.9 109.7 90 Retest #43
45 06-Aug-20 305.5 Site Fill A 15.9 109.9 92 B.O.X.
46 06-Aug-20 306.5 Site Fill D 14.7 112.4 90
47 06-Aug-20 306.5 Site Fill C 16.1 112.0 93
48 06-Aug-20 307.5 Site Fill C 15.7 111.8 92
49 06-Aug-20 307.5 Site Fill A 16.4 109.5 91
50 06-Aug-20 308.0 Site Fill A 16.8 108.1 90
51 06-Aug-20 308.0 Site Fill C 16.6 109.4 90
52 06-Aug-20 308.5 Site Fill A 16.0 108.4 90
53 06-Aug-20 301.5 Building Pad F 12.4 113.0 92 B.O.X.
54 06-Aug-20 303.5 Building Pad A 17.0 107.5 90 B.O.X.
55 06-Aug-20 302.5 Building Pad C 16.8 111.6 92
56 06-Aug-20 302.5 Site Wall F 13.9 111.8 91 B.O.X.
57 06-Aug-20 303.0 Building Pad B 9.0 113.0 88 Fail: 90% Required
58 06-Aug-20 303.0 Building Pad B 12.7 114.9 90 Retest #57
59 06-Aug-20 303.5 Site Wall C 16.7 110.3 91
60 06-Aug-20 303.5 Building Pad C 16.5 109.9 91
20M132- Harbor Day School Phase 1 -- Corona Del Mar, California Page 1
TABLE 1
SUMMARY OF FIELD DENSITY TESTS
Test No.Date Elev.Test Soil Moisture Dry Density Relative Comments
(ft)Location Type Content (pcf)Compaction
(%)(%)
61 06-Aug-20 305.0 Site Wall F 13.8 110.4 90
62 07-Aug-20 304.5 Building Pad C 17.0 111.4 92
63 07-Aug-20 304.5 Building Pad D 14.8 112.5 90
64 07-Aug-20 306.0 Site Wall E 12.5 110.3 90
65 07-Aug-20 304.5 Building Pad A 15.8 109.9 92
66 07-Aug-20 304.0 Building Pad C 15.4 110.0 91 B.O.X.
67 07-Aug-20 302.5 Building Pad C 15.5 109.8 91 B.O.X.
68 07-Aug-20 307.0 Site Wall E 10.1 108.1 88 Fail: 90% Required
69 07-Aug-20 307.0 Site Wall E 12.0 109.9 90 Retest #68
70 07-Aug-20 305.5 Building Pad C 15.4 112.9 93
71 07-Aug-20 305.0 Building Pad C 15.2 111.0 92
72 07-Aug-20 304.5 Building Pad A 15.9 108.9 91
73 07-Aug-20 292.0 Stairs C 17.0 108.4 90
74 07-Aug-20 294.0 Stairs C 15.6 110.5 91
75 07-Aug-20 296.5 Stairs C 16.7 109.6 91
76 07-Aug-20 305.5 Building Pad D 14.1 112.4 90
77 07-Aug-20 305.5 Building Pad A 15.3 108.7 91
78 07-Aug-20 306.5 Building Pad C 14.8 106.2 88 Fail: 90% Required
79 07-Aug-20 306.5 Building Pad C 15.5 108.8 90 Retest #78
80 07-Aug-20 298.0 Stairs C 16.1 111.4 92
81 07-Aug-20 298.5 Building Pad E 12.8 111.3 91 B.O.X.
82 07-Aug-20 300.0 Stairs A 15.3 106.9 89 Fail: 90% Required
83 07-Aug-20 300.0 Stairs A 15.5 107.6 90 Retest #82
84 07-Aug-20 300.0 Building Pad A 16.3 109.6 91
85 07-Aug-20 303.0 Stairs C 15.3 109.3 90
86 07-Aug-20 306.5 Building Pad A 15.2 108.0 90
87 07-Aug-20 306.5 Building Pad D 14.7 112.5 90
88 07-Aug-20 307.0 Building Pad D 14.2 113.1 90
89 07-Aug-20 308.0 Building Pad C 16.0 109.9 91
90 07-Aug-20 302.0 Site Wall A 16.3 109.3 91 B.O.X.
91 07-Aug-20 305.0 Stairs C 15.5 108.3 90
92 07-Aug-20 308.5 Building Pad D 14.7 112.9 90
93 10-Aug-20 302.0 Building Pad E 13.1 110.3 90
94 10-Aug-20 302.0 Site Wall E 13.2 113.1 92 B.O.X.
95 10-Aug-20 308.5 Building Pad C 15.1 112.1 93
96 10-Aug-20 308.5 Building Pad C 15.4 111.8 92
97 10-Aug-20 303.5 Building Pad C 15.7 107.3 89 Fail: 90% Required
98 10-Aug-20 303.5 Building Pad C 16.7 108.4 90 Retest #97
20M132- Harbor Day School Phase 1 -- Corona Del Mar, California Page 2
TABLE 1
SUMMARY OF FIELD DENSITY TESTS
Test No.Date Elev.Test Soil Moisture Dry Density Relative Comments
(ft)Location Type Content (pcf)Compaction
(%)(%)
99 10-Aug-20 303.5 Building Pad F 13.8 111.2 90
100 10-Aug-20 307.0 Stairs C 15.9 111.4 92
101 10-Aug-20 308.5 Building Pad C 15.2 112.1 93
102 10-Aug-20 309.0 Building Pad A 16.2 108.3 90
103 10-Aug-20 305.0 Building Pad A 16.5 109.2 91
104 10-Aug-20 309.0 Building Pad F 13.4 112.6 92
105 10-Aug-20 308.5 Stairs D 14.3 113.8 91
106 10-Aug-20 288.0 Stairs D 14.0 112.9 90
107 10-Aug-20 289.5 Stairs A 16.8 105.8 88 Fail: 90% Required
108 10-Aug-20 289.5 Stairs A 16.0 107.9 90 Retest #107
109 10-Aug-20 305.0 Building Pad D 14.1 113.0 90
110 10-Aug-20 SG Fire Road D 13.8 114.2 91
111 10-Aug-20 SG Fire Road C 15.4 111.3 92
112 10-Aug-20 SG Fire Road C 15.8 109.9 91
113 10-Aug-20 291.0 Sairs C 15.1 110.3 91
114 11-Aug-20 297.0 Building Pad A 16.7 107.7 90 B.O.X.
115 11-Aug-20 302.5 Building Pad A 17.0 108.0 90
116 11-Aug-20 292.5 Stairs C 16.6 108.3 90
117 11-Aug-20 297.0 Building Pad D 15.0 113.9 91
118 11-Aug-20 294.0 Stairs B 13.0 114.9 90
119 11-Aug-20 299.5 Building Pad A 15.4 107.8 90
120 11-Aug-20 299.0 Building Pad A 15.3 108.2 90
121 11-Aug-20 306.0 Building Pad C 15.7 110.2 91
122 11-Aug-20 297.0 Stairs A 13.3 106.1 88 Fail: 90% Required
123 11-Aug-20 301.0 Building Pad A 15.4 108.3 90
124 11-Aug-20 302.0 Building Pad D 14.7 112.5 90
125 11-Aug-20 297.0 Stairs A 15.2 107.8 90 Retest #122
126 11-Aug-20 303.0 Building Pad E 13.3 110.2 90
127 11-Aug-20 304.0 Building Pad D 14.1 113.5 90
128 11-Aug-20 301.5 Building Pad A 18.4 109.4 91 Fail: 90% Required/B.O.X.
129 11-Aug-20 301.5 Building Pad A 16.7 108.3 90 Retest #128
130 11-Aug-20 298.5 Stairs E 12.1 111.4 91
131 11-Aug-20 304.0 Site Fill F 12.9 111.6 91
132 11-Aug-20 305.0 Building Pad E 13.0 110.7 90
133 11-Aug-20 303.5 Slope Fill A 19.1 104.1 87 Fail: 90% Required/B.O.X.
134 11-Aug-20 303.5 Slope Fill A 16.4 108.0 90 Retest #133
135 11-Aug-20 306.0 Site Fill E 12.9 111.9 91
136 11-Aug-20 305.0 Building Pad F 11.9 109.1 89 Fail: 90% Required
20M132- Harbor Day School Phase 1 -- Corona Del Mar, California Page 3
TABLE 1
SUMMARY OF FIELD DENSITY TESTS
Test No.Date Elev.Test Soil Moisture Dry Density Relative Comments
(ft)Location Type Content (pcf)Compaction
(%)(%)
137 11-Aug-20 305.0 Building Pad F 13.1 110.4 90 Retest #136
138 11-Aug-20 302.5 Building Pad A 15.5 108.4 90 B.O.X.
139 11-Aug-20 306.0 Building Pad F 13.5 110.7 90
140 11-Aug-20 301.0 Stairs A 14.5 105.6 88 Fail: 90% Required
141 12-Aug-20 304.5 Slope Fill B 13.9 115.3 90
142 12-Aug-20 304.0 Building Pad C 12.8 107.5 89 Fail: 90% Required
143 12-Aug-20 306.0 Slope Fill A 12.4 106.8 89 Fail: 90% Required
144 12-Aug-20 307.0 Site Fill C 15.7 108.8 90
145 12-Aug-20 306.0 Site Fill A 16.0 107.9 90 Retest #143
146 12-Aug-20 304.0 Site Fill C 16.8 108.7 90 Retest #142
147 12-Aug-20 307.0 Site Fill E 12.6 110.3 90
148 12-Aug-20 305.0 Site Fill C 15.3 109.8 91
149 12-Aug-20 306.5 Slope Fill E 12.7 110.5 90
150 12-Aug-20 307.5 Stairs A 15.0 107.7 90
151 12-Aug-20 307.0 Building Pad A 16.8 110.2 92
152 12-Aug-20 307.5 Slope Fill C 16.7 109.8 91
153 12-Aug-20 308.0 Building Pad A 14.7 106.3 89 Fail: 90% Required
154 12-Aug-20 308.0 Building Pad D 14.3 113.0 90
155 12-Aug-20 308.0 Building Pad A 15.8 108.6 91 Retest #153
156 12-Aug-20 308.5 Building Pad A 16.1 109.1 91
157 12-Aug-20 308.5 Building Pad D 14.5 112.8 90
158 12-Aug-20 309.0 Building Pad C 15.8 109.2 90
159 12-Aug-20 301.0 Building Pad A 16.2 108.5 90 Retest #140
160 12-Aug-20 309.0 Building Pad D 14.1 113.9 91
161 13-Aug-20 304.0 Building Pad A 16.2 107.9 90 B.O.X.
162 13-Aug-20 302.5 Building Pad D 14.1 114.1 91 B.O.X.
163 13-Aug-20 305.0 Building Pad C 15.7 109.1 90
164 13-Aug-20 303.5 Building Pad B 13.1 115.0 90 B.O.X.
165 13-Aug-20 304.0 Building Pad A 16.1 109.0 91
166 13-Aug-20 306.0 Building Pad A 15.5 108.8 91 B.O.X.
167 13-Aug-20 302.5 Site Wall E 12.7 111.5 91 B.O.X.
168 13-Aug-20 303.5 Site Wall D 14.3 112.5 90
169 13-Aug-20 304.5 Building Pad C 13.5 106.3 88 Fail: 90% Required
170 13-Aug-20 302.5 Slope Fill A 15.9 108.2 90 B.O.X.
171 13-Aug-20 304.5 Building Pad C 15.3 108.8 90 Retest #169
172 13-Aug-20 305.5 Site Wall C 16.3 109.8 91
173 13-Aug-20 305.5 Building Pad A 15.2 107.5 90
174 13-Aug-20 304.0 Site Wall C 16.5 112.2 93
20M132- Harbor Day School Phase 1 -- Corona Del Mar, California Page 4
TABLE 1
SUMMARY OF FIELD DENSITY TESTS
Test No.Date Elev.Test Soil Moisture Dry Density Relative Comments
(ft)Location Type Content (pcf)Compaction
(%)(%)
175 13-Aug-20 304.0 Slope Fill F 13.5 112.1 91
176 13-Aug-20 304.5 Site Wall E 12.9 111.6 91
177 13-Aug-20 305.0 Building Pad A 15.8 108.2 90
178 13-Aug-20 305.0 Building Pad F 13.8 110.8 90
179 13-Aug-20 306.5 Building Pad C 14.2 107.3 89 Fail: 90% Required
180 13-Aug-20 305.5 Site Wall C 16.8 109.0 90
181 13-Aug-20 306.0 Slope Fill F 14.0 110.5 90
182 13-Aug-20 306.5 Building Pad C 15.2 108.6 90 Retest #179
183 14-Aug-20 307.0 Building Pad C 16.6 111.6 92
184 14-Aug-20 307.0 Building Pad F 12.7 113.6 92
185 14-Aug-20 307.5 Building Pad C 16.1 111.0 92
186 14-Aug-20 306.0 Site Wall D 13.9 113.4 90
189 14-Aug-20 306.5 Site Wall F 11.9 109.9 89 Fail: 90% Required
190 14-Aug-20 306.5 Site Wall F 12.8 111.8 91 Retest #189
191 14-Aug-20 307.0 Site Wall E 13.5 110.2 90
192 14-Aug-20 308.0 Building Pad C 16.9 111.4 92
193 14-Aug-20 308.0 Building Pad A 16.5 110.2 92
194 14-Aug-20 307.5 Building Pad D 14.5 112.5 90
198 14-Aug-20 308.5 Building Pad C 15.4 109.5 90
199 14-Aug-20 307.5 Site Wall E 12.7 110.5 90
200 14-Aug-20 308.0 Site Wall E 12.9 111.6 91
201 14-Aug-20 308.5 Building Pad E 13.3 110.4 90
202 14-Aug-20 308.5 Building Pad D 14.7 112.7 90
203 14-Aug-20 309.0 Site Wall D 14.2 113.3 90
204 14-Aug-20 309.0 Building Pad E 12.8 112.9 92
205 14-Aug-20 309.0 Building Pad D 12.7 112.0 89 Fail: 90% Required
206 14-Aug-20 309.0 Building Pad D 13.5 113.9 91 Retest #205
207 14-Aug-20 301.5 Building Pad E 9.3 108.8 89 Fail: 90% Required/B.O.X.
208 14-Aug-20 304.5 Building Pad E 13.0 111.4 91 B.O.X.
209 14-Aug-20 305.0 Building Pad A 16.8 107.7 90 B.O.X.
210 14-Aug-20 301.5 Building Pad E 12.9 111.0 91 Retest #207/B.O.X.
211 17-Aug-20 302.5 Building Pad A 15.3 107.6 90
212 17-Aug-20 305.5 Building Pad A 13.7 105.3 88 Fail: 90% Required
213 17-Aug-20 305.5 Building Pad A 15.6 108.1 90 Retest #212
214 17-Aug-20 304.0 Building Pad D 13.4 114.6 91
215 17-Aug-20 302.0 Building Pad E 12.9 112.8 92 B.O.X.
216 17-Aug-20 305.0 Building Pad C 16.3 111.0 92
217 17-Aug-20 304.0 Building Pad E 13.0 111.8 91
20M132- Harbor Day School Phase 1 -- Corona Del Mar, California Page 5
TABLE 1
SUMMARY OF FIELD DENSITY TESTS
Test No.Date Elev.Test Soil Moisture Dry Density Relative Comments
(ft)Location Type Content (pcf)Compaction
(%)(%)
218 17-Aug-20 304.5 Building Pad C 16.1 109.6 91
219 17-Aug-20 305.0 Building Pad A 16.2 107.3 89 Fail: 90% Required
220 17-Aug-20 305.0 Building Pad A 16.3 107.8 90 Retest #219
221 17-Aug-20 306.0 Building Pad C 16.2 110.6 91
222 17-Aug-20 306.0 Building Pad F 14.0 113.4 92
223 17-Aug-20 305.5 Building Pad C 16.4 111.2 92
224 17-Aug-20 306.5 Building Pad C 16.9 110.7 91
225 17-Aug-20 306.5 Building Pad E 12.4 112.5 92
226 17-Aug-20 307.0 Building Pad A 15.8 108.3 90
227 17-Aug-20 306.5 Building Pad F 13.5 111.9 91
228 17-Aug-20 307.0 Building Pad F 13.4 113.2 92
229 17-Aug-20 307.5 Building Pad C 13.9 107.2 89 Fail: 90% Required
230 17-Aug-20 307.5 Building Pad C 15.2 108.6 90 Retest #229
231 17-Aug-20 307.5 Building Pad F 13.8 112.4 91
232 17-Aug-20 308.0 Building Pad C 15.2 111.0 92
233 17-Aug-20 307.5 Building Pad A 16.3 108.4 90
234 17-Aug-20 307.5 Building Pad F 13.3 112.5 91
237 18-Aug-20 305.5 Building Pad B 14.0 116.8 91 B.O.X.
238 18-Aug-20 306.5 Building Pad C 15.5 110.1 91
239 18-Aug-20 304.5 Site Wall C 16.9 110.3 91 B.O.X.
240 18-Aug-20 307.5 Building Pad F 13.5 112.1 91
241 18-Aug-20 307.0 Building Pad A 15.4 107.9 90
242 18-Aug-20 308.0 Building Pad B 13.7 118.1 92
243 18-Aug-20 306.0 Site Wall B 13.8 114.6 90
244 18-Aug-20 307.5 Building Pad B 13.2 115.1 90
245 18-Aug-20 307.0 Site Wall A 17.7 104.7 87 Fail: 90% Required
246 18-Aug-20 308.0 Building Pad C 16.2 110.6 91
247 18-Aug-20 308.0 Building Pad D 14.6 112.5 90
248 18-Aug-20 307.0 Site Wall A 16.9 109.0 91 Retest #245
249 18-Aug-20 308.0 Building Pad A 15.5 108.8 91
250 18-Aug-20 308.0 Site Wall C 16.4 112.3 93
251 18-Aug-20 305.5 Site Fill F 13.5 110.3 90
254 18-Aug-20 309.0 Building Pad C 15.2 111.4 92
255 18-Aug-20 306.5 Site Fill F 13.3 111.5 91
256 18-Aug-20 308.0 Site Wall C 16.1 112.9 93
257 18-Aug-20 309.0 Building Pad F 13.7 112.0 91
259 19-Aug-20 309.5 Building Pad D 13.9 116.4 93
260 19-Aug-20 309.5 Building Pad B 13.7 117.6 92
20M132- Harbor Day School Phase 1 -- Corona Del Mar, California Page 6
TABLE 1
SUMMARY OF FIELD DENSITY TESTS
Test No.Date Elev.Test Soil Moisture Dry Density Relative Comments
(ft)Location Type Content (pcf)Compaction
(%)(%)
261 19-Aug-20 308.0 Building Pad D 14.2 112.8 90
262 19-Aug-20 308.5 Building Pad C 16.4 111.0 92
263 19-Aug-20 308.5 Building Pad B 13.0 115.5 90
264 19-Aug-20 309.0 Building Pad D 14.9 113.8 91
265 19-Aug-20 308.5 Building Pad C 17.8 106.3 88 Fail: 90% Required
266 19-Aug-20 308.5 Building Pad C 16.9 108.5 90 Retest #265
268 19-Aug-20 309.0 Building Pad F 13.3 112.9 92
269 19-Aug-20 SG Pavement SG B 12.9 115.9 91
270 19-Aug-20 SG Pavement SG A 15.7 108.2 90
271 19-Aug-20 SG Pavement SG B 13.2 117.2 92
272 20-Aug-20 309.5 Building Pad D 14.3 114.8 91
273 20-Aug-20 309.5 Building Pad A 15.8 111.0 93
274 20-Aug-20 309.0 Building Pad D 14.1 115.5 92
275 20-Aug-20 SG Pavement SG B 13.0 118.5 93
276 20-Aug-20 309.5 Building Pad F 13.4 114.3 93
277 20-Aug-20 FP Building Pad A 15.2 111.4 93 Fail: 95% Required
278 20-Aug-20 FP Building Pad F 13.1 116.4 95
279 20-Aug-20 FP Building Pad A 15.1 115.3 96 Retest #277
280 20-Aug-20 FP Building Pad A 15.4 113.7 95
281 20-Aug-20 FP Building Pad C 15.2 114.6 95
287 21-Aug-20 FP Building Pad D 14.0 119.2 95
288 21-Aug-20 FP Building Pad A 15.7 114.2 95
289 21-Aug-20 FP Building Pad C 15.5 114.7 95
NOTES: Elevations Referenced To Grade Stakes Set In Field By Others
FP = Finished Pad Grade (Approximate El. = 309.6)
B.O.X. = Bottom of Overexcavation
Retests Performed After Recompaction
All Tests Performed By Nuclear Test Method (ASTM D-6938) Unless Otherwise Noted
20M132- Harbor Day School Phase 1 -- Corona Del Mar, California Page 7
TABLE 2
SUMMARY OF MOISTURE-DENSITY RELATIONSHIPS
Soil Type Soil Description Maximum Dry
Density (pcf)
Optimum
Moisture (%)
A Light Brown Clayey fine to coarse Sand, trace fine Gravel 120.0 13.0
B Brown fine to coarse Sandy Clay, trace fine to coarse Gravel 128.0 10.5
C Brown Silty Clay, little fine Sand 121.0 13.0
D Brown Clayey fine to medium Sand 125.5 11.0
E Light Gray Brown Silty fine Sand, little Clay 122.5 9.5
F Light Gray Brown Silty fine Sand, trace Clay 123.0 10.0
Note: All Moisture-Density Relationships determined per ASTM D-1557 (Modified Proctor)
20M132- Harbor Day School Phase 1 -- Corona Del Mar, California Page 8