HomeMy WebLinkAboutCT 04-15; LA COSTA GREENS NEIGHBORHOOD 1.06 & 1.07; FINAL REPORT OF TESTING AND OBSERVATION SERVICES PERFORMED DURING PAD REGRADING; 2012-07-12-
CiOt4i
GEOCON
INCORPORATED I
GEOTECHNICAL ..EN.V..lRONMENTAL • MATE.RiA.1S
Project No. 06403-52-34A
-• July 12, 2012 -
WilliamLyons Homes, Inc..
4490 Von Karman Avenue
Newport Beach, California 92660
Attention: Ms. Faith Demotor -
'Subject: FINAL REPORT OF TESTING AND OBSERVATION
SERVICES PERFORMED DURINGPAD REGRADING 0
VILLAGES OF LA COSTA - THE GREENS; NEIGHBORHOOD 1.07
CARLSBAD;CALIFORNIA I '
Dear Ms. Demotor:
In accordance with your request and our proposal dated February 17, 2009, we have provided
compaction testing and observation services during building pad regrading operations at the subject
project We performed our services on an "on-call" basis during the period of March 29, 2010
through April 5, 2012. The scope Of our services included:,
Performing in-place density tests during minor pad regrading,
"Providing geotechnical consultation services during this phase of site development;
Preparin"g this final repori of pad regrading.
To aid in preparing thi§ report, we have reviewed the following reports and plans associated with the
project improvements: 0
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0 0
•0
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1. -Update Geotechnical Report, Villages of La Costa - The Greens, Phase 2, Neighborhood 1.07,
0 Ccirlsbàd, Calif prepared by Geocon Incorporated, dated January 25, 2010 (Project
0 No. 06403-52-34);
0 0 2. 0 Final Report of Testing and Obseatidn Seivices During Site Improvements,- 'Villages of La
Cost -. The Greens Phase 2; Neighborhood 1.07, Carlsbad, California,, prepared by Qeocomi '
Incorporated, dated April 28, 2008 (Project No. 06403-52-24). 0
During pad regrading operations, we observed compaction procedures and perforrred in place density
tests to evaluate the dry density and moisture content of the fill material The regrading operations
0 ' were limited to the upper 1 to 2 feet of the existing grade to reestablish the pad grades presented in
'the referenced report dated January 25,2010. We performed in-place density tests using a nubler
0 density gauge in accordance with ASTM Test Procedures D 6938. We performed laboratory tests in - •' 0
0 accordance with ASTM D 1557, Maximum Dry Density and Optimum Moisture Content. 0
0
6960 Flanders Dive • San Diego, California 92121-2974 • Telephone 858.558.6900 U, Fox, 858.558.6159 0
O 0 0•,
• ' .. / 0 -
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0
In general, the results of the in-place density, tests indicate that the tested materials possess a dry
density of at least 90 percent of the laboratory maximum dry density near to slightly above optimum
moisture content at the locations tested. The results of the in-place-density tests are summarized in
Table I and laboratory test results are summarized in Table II.
Based on our testing and observation results,, it is the opinion of Geocon Incorporated that the
processing and recompaction of the building pads, which is the subject of this report, has been
performed in substantial conformance with the recommendations of the project geotechnical report.
The recommendations presented in the referenced report dated January 25, 2010, remain applicable
for the design and construction of the planned improvements.
Additional grading and/or ithrovement installation performed at the site, should be.accomplished in
conjunction with our observation and testing services. Grading plans for any future grading should be
reviewed by Geocon Incorporated prior to finalizing. Trench and wall backfill and sidewalk subgrade
should be compacted to a dry density of at least 90 percent of the laboratory maximum,dry density
near to slightly above optimum moisture content: 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 foundations or 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 life.
4'.
Should you have any' questions regarding this report, or if we may be of further, service, please
contact the undersigned at your convenience.
Very truly yours,
GEOCON INCORPORATED.
AL - '
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Al
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"wFoy Weedon Sad SA NO2714
CEG 1778 CERTIFIED --I GE 2714 Exp. 3 rn
ENGINEERING 4 Z0,
GEOLOGIST
OF CAO~
(4) Addressee ()P CA0f
Project No 06403-52-34A 2 July 12 2012
•• •.. ' ' ' •.. ..,,. .•. ,-
- N.
TABLE I
SUMMARY OF FIELD DENSITY TEST RESULTS
Elev. Plus Field Field Field Reqd.
or 3/4' Dry Moist. Rel. Rel.
Depth Curve Rock Dens. Cont. Comp. Comp.
Test No. Date Location t) No. ( o) (pct) (%) ( o) ( o)
RG 1 03/29/10 Lot 1; PG 139 82 0 108.2 14.5 90 90
RG 2 03/29/10 Lot 2; PG 143 82 0 109.0 14.3 91 90
RG 3 03/29/10 Lot 3;FG 148 17 0 105.4 15.1 90 90
RG . 4 03/29/10 Lot 4; PG 152 17 0 106.0 13.2 91 90
RG 5 03/29/10 Lot 5; PG . 156 17 0 105.9 14.1 91 90
RG 6 03/29/10 Lot 6; PG 160 82 0 110.9 14.5 92 90
RG 7 03/29/10 Lot 7; PG 164 82 0 108.1 16.0 90 90
RG 8 03/30/10 Lot 8; FG 168 82 0 109.9 15.7 92 90
RG 9 03/30/10 Lot 9; PG ' 173 82 0 110.1 13.5 92 90
RG-------1003/30/10 Lot 71; PG ' , 177 17 0 108.6 14.7- 93 90
RG 11 03/30/10 Lot 70;PG '' 178 17 0, 107.5 15.3 92 90
RG 12, 03/30/10 Lot 69;PG . 179 17" 0 .105.1 16.2 . 90 90
RG 13 07/12/10 Lot 68;FG 179 90 0 102.9 . 18.1 91 90
RG 14 07/12/10 Lot 67 PG 179 90 0 1031 179 91 90
RG 15 07/12/10 Lot 66; PG 180 90 0 1029 180 91 90
RG 16 07/12/10 Lot 65; F& . . .180 90 0 ' 103.5 19.1 91 90
RG 17 , 07/12/10 Lot 64;FG ', . . 181 17 0 105.7 15.7 , 91 90
RG 18 . 07/12/10 Lot 63;FG , 181 17 0 104.8 17.3 90 90
RG - 19 07/12/10 Lot 62; PG 181 ' 17 0 104.9 17.9 90 90
RG 20 '07/12/10'Lot61;PG 180 17 0 105.5. 16.1 ' 91 90
RG 21 07/12/10 Lot 60; FG ' ' .178 , 17 0 108.5 13.6. 93 90
RG 22 07/12/10 Lot 59; PG ' ' 176 17 0 104.8 16.7 90 90
RG 23 07/12/10 Lot 58;FG 173 17 0' 105.2 17.3 :90, 90
'RG 24 07/12/10 Lot 57; PG ' ' ' ' ' 171 17 0 106.1 16.1 91 90
RG 25 03/07/11 Lot 28; FG 1154 23 , 0 105.3 20.6 92 . 90
RG 26 03/07/11 Lot 29; PG ' 150 23 0 106.9 19.5 94 90
RG 27 03/07/11 Lot 30; PG ', 146 23 0 108.0 19.8 95 90
RG 28 03/07/11 Lot 3l FG 142 77 0 1129 177 93 90
RG 29, 03/07/11 Lot 32; ' 138 77
,
0 113.7 14.6 94 90
RG 30 03/07/11 Lot 50; FG , ' 153 23 0 106.4 18.8 , 93 90
RG .31 03/07/11 Lot 51; PG ,' , ' . 159' 23 0 107.5 19.3 94 90
RG 32 03/07/11 Lot 52; FG ' ' 161 ' 23 ' . 0 108.4 16.4 95 90
RG . 33 03/07/11 Lot 53;PG . 163 23 0 108.1 17.3 95 90
RG 34 03/07/11 Lot 54; FG . . 165 23 0' .108.1 16.9 95 90
RG 35 03/07/1I Lot 55; PG ,. 167 23 0 105.6. 18.9 93 90
RG. 36 03/07/11 Lot 56; PG '
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169 23 0 .106.2 17.1 , 93 90
RG 37 07/01/11 Lot 22; PG 191 23 0 1072 169 94 90
RD 38 07/01/11 Lot 23; PG 190 23 0 1027 165 90 90
RG 39 07/05/11 Lot 26; PG ' 189 23 0 106.9 17.6 94 ' 90
RD 40 07/05/11 Lot 25; PG 189 23 0 1043 1,73, 91 90
RD 41 07/05/11 Lot 24;PG , , ' ' ' ' 190 ' 23 ' 11 '107.8 ' 16.7 94 90
RD , 42 07/05/11 Lot 21; PG , . 191' 23 ' 0 106.4 .16.6 ' 93 90
RG 43 07/07/11 Lot 20 PG 192 23 0 106.8 16.2 94 90
RG 44 07/07/11 Lot 19; FG ' ' . 193 23 0 103.8 18.9 91 , 90
RG 45 07/07/11 Lot 18; PG ' :194 23 , 0 103.1 17.9 90 90
Project No. 06403-52-34A ' ." ' ' July 12, 2012
p .
TABLE 1
SUMMARY OF FIELD DENSITY TEST RESULTS
Elev. Plus Field Field Field Reqd.
or 3/4" Dry Moist. Rel. Rel.
Depth Curve Rock Dens. Cont. Comp. Comp.
Test No. Date Location t) No. ( o) (pci) ( o) ( o) ( o)
RG 46 07/07/11 Lot 16; FG 194 23 0 109.3 17.4 96 90
RG 47 07/08/11 Lot 15; FG 194 23 0 106.0 16.4 93 90
RG 48 07/08/11 Lot 14; PG 191 23 0 109.0 16.6 96 90
RG 49 07/08/11 Lot 13; PG 191 - 23 0 104.4 17.7 91 90
RG------5007/08/11 Lot 12; FG 190 23 0 106.1 17.0 93 90
-
RG 51 07/08/11 Lot 11; FG . 189 23 0 105.7 17.3 93 90
RG 52 07/08/11 Lot 10; FG - 188 23 0 106.2 17.0 93 90
RG 53 07/08/11 Lot 27; FG 188 23 0 103.0 16.6 90' 90
RG 54 07/08/11 Lot 17; FG - 194 23 0 107.6 18.1 94 90
RG 55 03/09/12 Lot 38;FG 137 17 0 107.2 15.3 92 90
RG 56 . 03/09/12 Lot 39;FG .
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- 136 17 0 106.8 14.8 92 90
RG 57 03/09/12 Lot 40;FG 136 17, 0 106.1 14.1 91 90
RG 58 03/09/12 Lot 41;FG 135 90 0 106.8 15.8 94 90
RG 59 03/09/12 Lot 42; FG - 134 90 0 106.1 14.9 93 90
RG60 03/09/12 Lot 43; FG 132 17 0 111.0 13.5 95 90
RG 61 03/09/12 Lot 49;FG
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127 88 0 102.6 16.9 91 90
RG 62 03/09/12. Lot 48; PG -. 128 88 0 104.2 - 16.4 92 90
RG 63 03/09/12 Lot 47; FG 129 88 0 107.1 16.0 95 90
RG. 64 03/09/12 Lot 46; FG 130 90 0 102.4 - 14.1 90 90
RG 65 03/09/12 Lot 45; PG / . - . 130 90 0 103.1 16.0 91 90
RG 66 03/09/12 Lot 44; PG
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131 90 0 102.5 15.3 90 90
RG 67 04/02/12 Lot 36; FG 132 90 0 104.2 16.1 92 90
RG 68 04/04/12 Lot 36; PG 132 .90 0 1064 16.3 94 90
RG 69 04/05/12 Lot 37; FG - 132 90 0 108.6 16.4 - 96 90 -
RG 70 04/05/12 Lot 3.6; PG . 132 90 0- A06.9 15.3 94 90
Project No. 06403-52-34A JUly 12, 2012 .
4 '.. •
TABLE
EXPLANATION OF CODED TERMS
- TEST SUFFIX
A, B, C, . . : Retest of previous density test failure, followingmoisture conditioning and/or recompaction.
- STRIKE-OUT
Fill in areaof density test failure was removed and replaced with properly compacted fill soil.
- PREFIX CODE DESIGNATION FOR TEST NUMBERS
FG - FINISH GRADE RG - REGRADE
- CURVE NO. .
Corresponds to curve numbers listed in the summary of laboratory maximum dry density and optimum
moisture content test results table for selected fill soil samples encountered during testing and observation.
- ROCK CORRECTION .
For density tests with rock percentage greater than zero, laboratory maximum dry density and optimum
moisture content were adjusted for rock content: For tests with rock content equal to zero, laboratory
maximum dry density and optimum moisture, content values are unadjusted..
-T\PEOFTEST . S
SC: Sand Cone Test (ASTMD 1556)
NU: Nuclear Density Test (ASTM D 6938 and D 2950) 5
OT: Other - S
- ELEVATION/I3EPTH . •.: . . .
Test elevations/depths have been rounded to the nearest whole foot.
Project No. 06403-52-34A July12, 2012
TABLE II
SUMMARY OF LABORATORY MAXIMUM DRY DENSITY
AND OPTIMUM MOISTURE CONTENT TEST RESULTS
ASTMDI557
Sample
No Description .
Maximum
Dry Density
(pet)
Optimum
Moisture Content
(% dry weight)
17 Light yellowish brown, Silty, fine to medium SAND 116.5 13.3
23 Olive green to brown, Sandy CLAY • 114.1 16.4
77 . Olive gray, Sandy CLAY ' 120.8 13.1
82 Light olive brown, Sandy SILT 120.0, 13.2
88 Orange mottled yellowish brown, Silty to Clayey, fine SAND 113.2 15.9
90 Light yellowish brown Sandy SILT 113.7 14 2
1