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~eotechnics
Incorporated
Principals:
Anthony F. Belfast
Michael P. Imbriglio
W. Lee Vanderhurst
December 27, 1996
Bruce D. Wiegand, Inc.
1060 Wiegand Street
Olivenhain, California 92024
Project No. 0007-003-05
Document No. 6-0828
SUBJECT:
COMPACTION REPORT
Testing & Observation of Earthwork Construction
Copper Creek Estates, Lot 7
Encinitas, California
Gentlemen:
This report summarizes the results of the testing and observation services performed by
Geotechnics Incorporated during grading operations at Lot 7 of the Copper Creek Estates
Development. Grading for this phase of the project was conducted by Burt Simms. Our
geotechnical services were performed between December 3, 1996 and December 17, 1996.
1.0 PURPOSE AND SCOPE OF SERVICES
This report and the associated geotechnical services were performed in accordance with the
verbal authorization given by Mr. Bruce Wiegand on December 3, 1996. Field personnel were
provided for this project in order to test and observe site grading operations. These observations
and tests assisted us in developing professional opinions regarding whether or not earthwork was
conducted in accordance with the project specifications and geotechnical recommendations. Our
services did not include supervision or direction of the actual work of the contractor, his
employees, nor agents. Our services did include the following.
.
Performing suitable field and laboratory tests on fill to support geotechnical
recommendations and conclusions.
Preparation of daily field reports summarizing the day's activity with regard to earthwork,
and documenting hours spent in the field by our technicians.
9951 Business Park Ave., Ste. B . San Diego California. 92131
Phone (619) 536-1000 . Fax (619) 536-8311
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Bruce D. Wiegand, Inc.
December 27, 1996
Project No. 0007-003-05
Document No. 6-0828
Page 2
.
Preparation of this report which summarizes site preparation, field and laboratory test
results, and the compaction operations.
2.0 SITE DESCRIPTION
The subject site consists of Lot 7 of the Copper Creek Estates in the community of Olivenhain,
California. The site is bordered by Wiegand Street on the .north, developed residential lots on
the east and south, and an undeveloped lot to the west. A schematic layout of the site, including
the approximate location of the density tests taken by Geotechnics during this phase of the
project, is presented in the Site Plan, Figure 1.
3.0 GRADING OPERATIONS
Grading of the property was performed using typical techniques with heavy equipment. In areas
which received fill, topsoil and colluvial soils were removed to expose competent formational
material. Equipment used for these operations included two paddle-pull scrapers and a dozer.
The fill materials were moisture conditioned with a fire hose and compacted in lifts with a steel-
wheeled sheepsfoot compactor. Imported non-expansive materials were placed in the upper two
feet of the driveway subgrade.
The maximum densities and optimum moisture contents of selected fill materials are shown in
Figure B-1 of the appendix, "Laboratory Test Results". The maximum densities and optimum
moistures of the soils were determined in the laboratory by ASTM method D1557, (Modified
Proctor). The on-site fill soils generally consisted of a fine to medium grained clayey sand (SC).
The non-expansive import consisted of a fine to medium grained silty sand (SM).
In-place moisture and density tests were made in accordance with ASTM D 2922 and D 3017
(Nuclear Gauge Method). The results of these tests are tabulated in Figure C-1 in the appendix,
"Field Density Test Results". The actual test locations are shown on the Site Plan, Figure 1. The
locations and elevations indicated for the tests are based on field survey stakes and estimates
from the grading plan topography, and should only be considered rough estimates. The
estimated locations and elevations should not be utilized for the purpose of preparing cross
sections showing test locations, or in any case, for the purpose of after-the-fact evaluating of the
sequence of fill placement.
Geotechnics Incorporated
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Geotÿchnics
I Incorporated
SITE PLAN
Copper Creek, Lot 7
Bruce D. Wiegand, Inc.
PROJECT NO. 0007-003-05
DOCUMENT NO. 6-0828
Figure 1
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Bruce D. Wiegand, Inc.
December 27, 1996
Project No. 0007-003-05
Document No. 6-0828
Page 3
5.0 CONCLUSIONS
In our opinion, site preparation and compaction was performed in general accordance with the
intent of the project geotechnical recommendations, project specifications, and with the
requirements of the City of Encinitas. Based upon our observations and testing, it is our
professional opinion that fill soils were placed in substantial accordance with the compaction
criteria of 90 percent of the maximum density (ASn~ 01557). The conclusions and
recommendations contained herein are based on our observations and testing performed between
December 3, 1996 and December 17, 1996. No representations are made as to the quality and
extent of materials not observed.
6.0 LIMITATIONS
Our services were performed using the degree of care and skill ordinarily exercised, under similar
circumstances, by reputable soils engineers and geologists practicing in this or similar localities.
No other warranty, expressed or implied, is made as to the conclusions and professional advice
included in this report. The samples taken and used for testing, the observations made, and the
in-place field testing performed are believed representative of the project; however, soil and
geologic conditions can vary significantly between tested or observed locations.
The findings of this report are valid as of the present date. However, changes in the conditions
of a property can occur with the passage of time, whether they be due to natural processes or
the works of man on this or adjacent properties. In addition, changes in applicable or appropriate
standards may occur, whether they result from legislation or the broadening of knowledge.
Accordingly, the findings of this report may be invalidated wholly or partially by changes outside
our control. Therefore, this report is subject to review and should not be relied upon after a
period of three years.
GEOTECHNICS INCORPORATED
~2¿~
Anthony F. Belfast, P.E. 40333
Principal
AFB/maf/jcm
Distribution: (4) Addressee
Geotechnics Incorporated
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APPENDIX A
REFERENCES
American Society for Testing and Materials, 1992, Annual Book of ASTM Standards, Section 4.
Construction. Volume 04.08 Soil and Rock: Dimension Stone: Geosvnthetics, ASTM,
Philadelphia, PA, 1296 p.
Geotechnics Incorporated, December 1, 1995, As-Graded Getechnical Report, Testing and
Observation of Earthwork Construction, Copper Creek Estates, Lot 3, Encinitas, California,
Project No. 0007-003-04, Document No. 5-0610.
Santa Fe Soils, Inc., January 12, 1987, Geologic and soils engineering investigation, 25 acre
hillside parcel, Lone Jack Road, Encinitas, California, SF-661.
Geotechnics Incorporated
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APPENDIX 8
LABORATORY TESTING
Selected representative samples of soils encountered were tested using test methods of the
American Society for Testing and Materials, or other generally accepted standards. A brief
description of the tests performed follows:
Classificàtion: Soils were classified visually according to the Unified Soil Classification System.
Visual classification was supplemented by laboratory testing of selected samples and clas-
sification in acèordance with ASTM D2487.
Maximum Density Optimum Moisture: The maximum density and optimum moisture for
representative soil samples were determined by using test method ASTM D1557, modified
Proctor. The test results are summarized in Figure B-1.
Geotechnics Incorporated
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MAXIMUM DENSITY TEST RESULTS
(ASTM D1557)
Sample Description Max. Dry Moisture
No. Density Content
(pet) (%)
1 Dark brown fine to medium grained clayey sand (SC). 118.3 13.5
2 Reddish brown fine to medium arained siltv sand lSM). 125.0 10.0
Laboratory Test Results
Copper Creek Estates, Lot 7
Bruce D. Wiegand, Inc.
Project No. 0007-003-05
Document No. 6-0828
Figure B-1
Geotechnics
Incorporated
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APPENDIX C
FIELD TEST RESULTS
-Elevations and locations of field tests were determined by hand level and pacing relative to field
staking done by others.
-The precision of the field density test and the maximum dry density test is not exact and
variations should be expected. For example, the American Society for Testing and Materials has
recently researched the precision of ASTM Method No. D1557 and found the accuracy of the
maximum dry density to be plus or minus 4 percent of the mean value and the optimum moisture
content to be ~ccurate to plus or minus 15 percent of the mean value; the Society specifically
states the "acceptable range of test results expressed as a percent of mean value" is the range
stated above. In effect, an indicated relative compaction of 90 percent has an acceptable range
of 86.6 to 92.8 percent based on the maximum dry density determination. The precision of the
field density test ASTM D1556 has not yet been determined by the American Society for Testing
and Materials; however, it must be recognized that it also is subject to variations in accuracy.
Geotechnics Incorporated
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~ Geotechnics DENSITY TEST RESULTS Project No. 0007-003-05
Copper Creek, Lot 7 Document No. 6-0828
Incorporated Bruce D. Wiegand, Inc. FIGURE C-1
Test Test Elevation Location/ Soil Max. Dry Moisture Dry Relative Required Retest
No. Date [ft] Station Type Density Content Density Compaction Compaction Number
[pet] [%] [pet] [%] [%]
1 12/3/96 159 Lot 7 1 118.3 16.5 108.9 92 90
2 12/3/96 160 Lot 7 1 118.3 18.2 108.9 92 90
3 12/3/96 161 Lot 7 1 118.3 13.8 109.5 93 90
4 12/4/96 162 Lot 7 1 118.3 19.4 106.8 90 90
5 12/4/96 164 Lot 7 1 118.3 14.1 110.7 94 90
6 12/4/96 166 Lot 7 1 118.3 21.0 106.4 90 90
7 12/4/96 167 Lot 7 1 118.3 17.5 108.5 92 90
8 12/5/96 169 Lot 7 1 118.3 16.1 110.6 93 90
9 12/5/96 171 Lot 7 1 118,3 14.8 110.9 94 90
10 12/5/96 175 Lot 7 1 118.3 18.3 107.8 91 90
11 12/5/96 176 Lot 7 1 118.3 15.9 107.6 91 90
12 12/5/96 175 Lot 7 1 118.3 17.4 110.9 94 90
13 12/5/96 174 Lot 7 1 118.3 16.9 109.2 92 90
14 12/5/96 178 Lot 7 1 118.3 18,0 105.9 90 90
15 12/5/96 179 Lot 7 1 118.3 17.5 106.3 90 90
16 12/5/96 182 Lot 7 1 118.3 15.9 108.6 92 90
17 12/17/96 183 Lot 7 2 125.0 7,2 117.0 94 90
18 12/17/96 177 Lot 7 2 125.0 7.4 121,3 97 90
19 12/17/96 177 Lot 7 2 125.0 7.3 106.5 85 90 20
20 12/17/96 177 Lot 7 2 125.0 7.4 112.6 90 90