HomeMy WebLinkAbout12-734 :` _��_ CITY OF DIAMOND BAR
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DON SOILS ENGINEERING, CO
CONSULTING GEOTECHNICAL ENGINEERS
2225 S.LA BREA AVE., LOS ANGELES,CA90016 TEL.(323)936-6763 FAX.(323)936-6581
� July 18, 2012
Project No.: G-2060
Rin Chou
12421 Bella Pine Dr.
Diamond Bar, California
Subject: COMPACTION REPORT (Secondary Structural Fill)
Backfill Existing Swimming Pool
12421 Bella Pine Drive
Diamond Bar, California ;
INTRODUCTION
Submitted herewith is a summary of the observation and testing services provided
from July 10, 2012 through July 17, 2012 by Don Soils Engineering, Co., during grading
operations. These observations and tests were required in order to comply with the City
of Diamond Bar grading ordinances.
The purpose of the grading was to backfill existing swimming pool for
playground and landscape.
� SITE CONDITIONS
The existing swimming pool and was located at the north side of Bella Pine Dr. in
the City of Diamond Bar.
The approximate location of field density tests and limits of certified fill is shown
on Drawing A. ASTM D-1557 was used for the laboratory standard for maximum
density and ASTM D-1556 for field density test method.
GENERAL GRADING PROCEDURE
The following is a discussion of the grading operations as they were performed on the
subject site.
1. The concrete shell of existing swimming pool is remained. Existing gunite
perimeter wall approximate 24" from the top was removed off. There were three �I
holes on bottom of existing concrete shell for drainage, minimum 2' diameter at 8 I
feet on center.
2. Deleterious materials at the area to be graded, such as concrete debris, were
removed and disposed of off-site prior to backfilling.
3. The depth of compacted fill was 3.0 feet to 6.0 feet.
4. Fill, consisting of import materials, placed in lifts restricted to eight inches in
thickness, watered as required to achieve near optimum moisture conditions, and
compacted to a minimum relative compaction of 90 percent of the laboratory
standard. The soils were compacted mechanically by construction equipments
5. The approximate locations of all tests taken within the graded limits included in
this report and test results are shown on the enclosed Drawing A and Table II.
Field density test result for tests performed on the entire project is presented at the
end of this report in Table I.
This report pertains only to the grading and compaction within specified site as
described herein and is subject to review by the appropriate regulating agencies.
Qp,pFESSION
Very truly yours, ��QtiooNG�1YU,y�/�Fy�
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Donghyun Yim
Civil Engineer sTqr oF�� �Fo P ��,
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TABLE I I
LABORAT RY I
O TEST SUMMARY
� Soil Classification MaYimum Optimum Cohesion �
Type Dry Density Moisture (ps� (degree)
lbs./cub.ft % Dry Wt
I Sand, silty, slightly clayey, 12g � 8 �
(SM) gray brown '
TABLE II
RELATIVE COMPACTION SUMMARY
Test Date of Depth Soil Type Moisture Dry Unit Relative
No. Test Below Fin. Content Weight Compaction
Grade(ft.) (percent) (pounds
per cubic
foot)
1 7/16/12 5 I 7.6 115.4 90.2
� 2 7/16/12 4 I 8.7 115.6 90.3
3 7/17/12 2 I 10.1 116.2 90.8
4 7/17/12 2 I 7.7 119.0 93.0
5 7/17/12 1 I 7.9 121.0 94.5
6 7/17/12 On-grade I 8.8 119.2 93.1
7 7/17/12 On-grade I 9.2 118.9 92.9
� PLOT PLAN AND �EST LOCATIONS
Existing ��6 �.���i Q Scale 1 "=30 '
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Swimming Pool �
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� Existing
� Residence •
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Bella Pine Dr.
Legend
: the limit c�f compacted fill
� : the depth of compacted fill
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: test number and approximate Iocations
SWIMMING POOL BACKFILL pROJECT NO. G-2060
21421 BELLA PINE DRIVE
DIAMOND BAR, CALIFORNIA DRAWING q
DON SOILS ENGINEERING, CO.
CONSULTING FOUNDATION ENGINEERS & ENGINEERING GEOLOGIST
.
• , ,
CITY OF DIAMOND BAR
DEPARTMENT OF BUILDING AND SAFETY
ENGINEER'S CERTIFICATE OF COMPLIANCE FOR COMPACTED EARTH FILLS
LOCATION OF FILL: ASSESSOR'S ID: 8292-020-020
JOB ADDRESS: 21421 BELLA P1NE DRIVE, DIAMOND BAR
AGENCY: DON SOILS ENGINEERING, CO.
PROPERTY OWNER'S NAME: R1N CHOU
OWNER'S ADDRESS: 21421 BELLA PINE DRIVE, DIAMOND BAR
PER REPORTS ON OUR PROJECT NO. G-2060
DATE WORK STARTED ON PROJECT: JULY 10, 2012
DATE FILL WAS COMPLETED: JULY 17, 2012 ,
DATE OF THIS CERTIFICATE: JULY 18, 2012
TO THE SUPERINTENDENT OF BUILDING:
"I hereby certify that I have personally inspected and tested the placing of compacted
earth fill on the above described property, and on the basis of these inspections and tests
it is my opinion that the same was placed in co •�t ey�� e requirements of the Los
Angeles County Building Code. ,��,�'``oo�'GHru,y����'��
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• For the purpose of this Certificate, to "have personally inspected and tested" shall
include inspection and testing performed by any person responsible to the licensed
engineer signing this certificate. Where the inspection and testing of all or part of the
work above is delegated, full responsibility shall be assumed by the licensed engineer
whose signature affixed thereon.