HomeMy WebLinkAbout; Roesch Property; Final Report of Testing and Observation Services; 2003-03-26I
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FINAL REPORT OF TESTING
AND OBSERVATION SERVICES
PERFORMED DURING CONSTRUCTION
OF SITE IMPROVEMENTS
ROESCH PROPERTY
CARLSBAD, CALIFORNIA
PREPARED FOR
STANDARD PACIFIC HOMES
CARLSBAD, CALIFORNIA
MARCH 26, 2003
GEOCON
INCORPORATED
GEOTECHNICAL CONSULTANTS
ProjectNo. 06074-52-05
March 20, 2003
Standard Pacific Homes
5750 Fleet Street, Suite 200
Carlsbad, Califomia 92008
Attention: Mr. Tom Ferrar
Subject: ROESCH PROPERTY
CARLSBAD, CALIFORNIA
FINAL REPORT OF TESTING AND OBSERVATION SERVICES
PERFORMED DURING CONSTRUCTION OF SITE IMPROVEMENTS
Gentlemen:
In accordance with your request and our proposal dated September 28, 2001 (LG-01482), we have
provided compaction testing and observation services during the construction of improvements at the
subject site. Our services were performed during the period of October 24, 2001 through February 20,
2003. The scope of our services included the following:
• Providing testing and observation services during utility trench backfill operations including
joint trench, water main, water lateral, sewer main, sewer lateral and storm drain.
Additionally, in-place density tests were performed during the preparation of subgrade for
curb and gutter, streets, and sidewalk as well as during the placement of aggregate base and
asphalt concrete pavement.
• Performing laboratory tests on selected samples of soil, aggregate base and asphalt concrete.
• Providing geotechnical consulting services during the installation of site improvements.
• Preparing this final report of improvements.
To aid in preparing this report, we have reviewed the following reports and plans associated with the
project improvements:
• Final Report of Testing and Observation Services During Site Grading, Roesch Property,
Carlsbad, CaUfornia, prepared by Geocon Incorporated, dated December 19, 2001 (Project
No. 06074-52-04).
• Improvement Plans for: Roesch Property CT 98-19, prepared by Hunsaker & Associates,
dated September 12, 2001.
6960 Flanders Drive • San Diego, California 92121-2974 • Telephone (858) 558-6900 • Fox (858) 558-6159
During the construction of site improvements, placement and compaction procedures were observed
and in-place density tests were performed to evaluate the dry density and moisture content of the fill
material. In-place dry density tests for soil and aggregate base were performed using a nuclear density
gauge in accordance with ASTM Test Procedure D 2922-96. In-place density tests for asphalt
concrete were performed using a nuclear gauge in accordance with ASTM Test Procedure D 2950-96.
Laboratory tests were performed on representative samples of soil and aggregate base to evaluate
moisture-density relationships, optimum moisture content, and maximum dry density (ASTM D
1557-00). Laboratory tests on asphalt concrete samples were performed in accordance with ASTM
test procedures for Hveem Density (D2?26-96a); Theoretical Maximum Density (D 1560-92);
StabiHty (D 6307-98); and Sieve Analysis (C 136-96a). In general, the on-site and imported fill
materials consist of sand, silty sand, and sandy gravel.
Laboratory tests of asphalt concrete were performed to verify conformance with Standard
Specifications for PubHc Works Construction (Green Book). Our laboratory testing indicated that the
amoimt of aggregate passing the No. 4 sieve, for both asphalt concrete sample Nos. AC-2 and AC-3,
was slightly below the lower bound of the Green Book specification of 50%. Additionally, the
amount of aggregate passing the Vs-inch sieve for asphalt concrete sample No. AC-2 was 68%, which
is lower than the Green Book specified range of 74-100%. Upon completion of laboratory testing,
these results were provided to the site superintendent. It is our opinion that these slight deviations
from specification are minor and will likely not affect the long-term performance of the pavement
section. The results of our laboratory tests indicate that the asphalt concrete meets or exceeds the
required stability value of 35.
The results of the in-place density tests for soil, aggregate base and asphalt concrete are summarized
in Table I. Laboratory test results are summarized in Tables II through VI.
In general, the results of the in-place density tests indicate that the utility trench backflll materials
possess a dry density of at least 90 percent of the laboratory maximum dry density at the locations
tested. In-place density tests indicate that the curb and gutter subgrade, street subgrade, and aggregate
base materials possess a dry density of at least 95 percent of the laboratory maximum dry density at
the locations tested.
In-place density testing was performed during the placement and compaction of asphalt concrete. The
test results indicate that the relative compaction of 95 percent of the laboratory Hveem density was
achieved at the locations tested.
Based on observations and test results, it is the opinion of Geocon Incorporated that the installation of
site improvements, which is the subject ofthis report, has been performed in substantial conformance
with the recommendations ofthe previously referenced project geotechnical report.
Project No. 06074-52-05 - 2 - March 26, 2003
Any additional grading and/or improvement installation performed at the site should be accomplished
in conjunction with our observation and compaction testing services. All trench and wall backfill
should be compacted to a dry density of at least 90 percent of the laboratory maximum dry density.
This office should be notified at least 48 hours prior to commencing additional grading or backfill
operations.
Adequate drainage provisions are imperative. Under no circumstances should water be allowed to
pond adjacent to improvements. Finish grades should be established so that drainage water is directed
away from pavements, curb and gutters and sidewalks to controlled drainage devices. Irrigation of
landscape areas adjacent to pavements should be monitored to provide just enough water to support
plant hfe.
If there are questions regarding this report, or if we may be of further service, please contact the
undersigned at your convenience.
Very truly yours,
GEOCON INCORPORATED
AS:SR:dmc
(6) Addressee
Shane Rodacker
RCE 63291
ProjectNo. 06074-52-05 -3-March 26, 2003
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TABLE II
SUMMARY OF LABORATORY MAXIMUM DRY DENSITY
AND OPTIMUM MOISTURE CONTENT TEST RESULTS
ASTMD 1557-00
Sample
No. Description
Maximum
Dry Density
(pcf)
Optimum
Moisture Content
(% dry weight)
1 Dark brown, Silty, fine to medium SAND 122.5 10.4
2 Light brown, Silty, fme to coarse SAND 124.0 10.6
3 Light grayish brown, Silty, fme to medium
SAND 115.1 13.8
4 Yellowish brown, Silty, fine to coarse SAND 124.6 10.6
5 Light gray, fme to medium SAND 120.2 11.4
6 Olive brown, fme to coarse Sandy GRAVEL
(class 2 base) 141.7 6.9
TABLE III
SUMMARY OF LABORATORY ASPHALT CONCRETE TEST RESULTS
Sample
No.
Test Green Book
Specifications Sample
No. Aggregate
Size (in.)
Theoretical
Maximum Density
(pcO
Hveem
Maximum Density
(pcO
Stability Stability
AC-1 3/4 154.3 149.9 36 >35
AC-2 1/2 154.3 146.7 45 >35
AC-3 1/2 156.6 150.5 38 >35
ProjectNo. 06074-52-05 March 26. 2003
TABLE IV
SUMMARY OF LABORATORY ASPHALT CONCRETE GRADATION
AND ASPHALT CONTENT TEST RESULTS
ASTM C 136 AND D 6307
Test Type 3/4-Inch Aggregate
Sample No. AC-1
Green Book
Section 400-4.3
Specifications Class B3
Sieve Analysis ASTM D-422-63
(Sieve Size) (% passing) (% passing)
1 inch 100 100
3/4 inch 97 90-100
3/8 inch 68 60-84
No.4 53 40-60
No. 8 39 24-50
No. 30 20 11-29
No. 200 6 1-9
Oil Content (%)* 4.9 4.6-6.0
*Green Book refers to as "Asphalt %"
TABLE V
SUMMARY OF LABORATORY ASPHALT CONCRETE GRADATION
AND ASPHALT CONTENT TEST RESULTS
ASTM C 136 AND D 6307
1/2-Inch Aggregate Green Book
Test Type Sample
No. AC-2
Sample
No. AC-3
Section 400-4.3
Specifications
Type m Class C3
Sieve Analysis ASTM D^22-63
(Sieve Size) (% passing) (% passing) (% passing)
3/4 inch 100 100 100
1/2 inch 93 92 89-100
3/8 inch 68 79 74-100
No.4 49 49 50-78
No. 8 34 34 32-60
No. 30 17 18 14-38
No. 200 5 5 2-10
Oil Content (%)* 4.9 4.6 4.6-7.0
*Green Book refers to as "Asphalt %'
Project No. 06074-52-05 March 26, 2003