HomeMy WebLinkAboutTract Map 21430 Lot 1-4 & 7 In Place Density Testingi .®m `MAI 2.1430
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September 12, 1997U 1997
1 Mr. John Gray
P.O. Box 8001
1 Newport Beach, California, 92658
(714) 376-6906 / FAX (714) 376-7906
1 Regarding: Geotechnical Report of In -Place Density Testing
Proposed Single Family Residential Community
Tract Map 21430, Lots 1-4 and 7 General Kearny Road
1 City of Murrieta, County of Riverside, California
Project Number: T1064 -C
1 References: 1. Soil Tech, Inc., May 23, 1987, Preliminary Geotechnical
Investigation, Tentative Tracts 21430 and 22627, Riverside County,
California, Project Number: T2211 -PS.
1 2. Soil Tech, Inc., October 17, 1995, Updated Geotechnical
Engineering Report, Proposed Single Family Residential
1 Community, Tract Map 21430-1, Lots 1-61, General Kearny Road,
City of Murrieta, Riverside County, California, Project Number:
T2211 -GS.
1 Gentlemen:
Representatives from EnGEN Corporation have conducted in-place density tests during
1 recompaction of near -surface earth materials within the limits of foundation demolition for
the above -referenced project site. The overexcavation and recompaction were performed
following demolition and removal of the concrete slabs and footings on each of the above -
referenced lots compacted. Fill materials placed for the proposed structure on each of
the subject lots have been tested by representatives of this firm.
1 In-place density and moisture content testing were performed in the proposed house pad
areas on each of the subject lots at depths of 1.0 to 2.0 -inches below finished pad
grades. The test results indicate that the soils meet a minimum relative compaction of 90
1 percent of maximum dry density and were within 2.0 percent of the optimum moisture
content for the material tested, based upon ASTM D1557-78(90) procedures. Results of
the in-place density testing are shown in the Appendix.
1
1 corporate Office
41607 Enterpnse Circle North, Suite 1
Temecula, CA 92590
(909)676-3095/Fax: 676-3294
1
Orange County Office
2615 Orange Avenue
Web -page address: w .engencorp.com Santa Ana. CA 92707
E-mail address: engencorp@pe.net (714) 546-00511 Fax: 5464052
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Mr. John Gray
Project No. TI 064-C
September 1997
Page 2
Recommendations for Desiqn and Construction
A wide range of expansive potential was encountered in the soils tested on the five lots.
As a result, each lot has been classified with respect to expansive soils potential, and
recommendations for design and construction are presented in the Appendix to this
report.
The opportunity to be of assistance is appreciated. Please direct any questions you may
have regarding this submittal to this office at your convenience.
Respectfully submitted,
EnGEN Corporation
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' DAENGE"EPORMCM064C Joh Gray Geo, Rpt. In -Placa Density
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EnGEN Corporation
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Mr. John Garay
Project No. T1064 -C
Appendix Page 1
t APPENDIX
TEST RESULTS
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' EnGEN Corporation
Mr. John Gray
Project No. T1064 -C
Appendix Page 2
SUMMARY OF FIELD IN-PLACE DENSITY TEST RESULTS
(Nuclear Gauge Test Method)
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TEST TEST
DEPTH or SOIL MAX. MOISTURE
DRY RELATIVE /REQUIRED
3
NO. DATE TEST LOCATION
ELEV. TYPE DENSITY CONTENT
DENSITY COMPACTION
91.2
(1997) (FT.)
(PCF) ("/o)
(PCF) (0A)
' 1 9-2 Lot 3 NE Comer -3.0 2 80.1 32.5 77.7 97.0 90
2 9-2 Lot NW Comer -2.0 2 80.1 35.2 77.6 96.9 90
3
9-2
Lot 4 SE Comer
-2.0
3
98.9
24.9
90.2
91.2
90
'
4
9-2
Lot 7 SE Comer
-2.0
3
98.9
26.5
88.3
89.3
90
5
9-2
Lot 7 NW Comer
-2.0
3
98.9
27.2
89.7
90.7
90
6
9-3
Lot 3 Center of pad
-1.0
5
89.5
29.4
84.5
94.4
90
'
7
9-3
Lot 3 North half
S.G.
5
89.5
28.2
80.8
90.2
90
8
9-3
Lot 4 Center of pad
-1.0
2
80.1
36.2
76.2
95.1
90
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' EnGEN Corporation
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9-3
Lot
S.G.
5
89.5
19.9
81.3
90.8
90
'
10
9-4
Retest of 4
-2.0
3
98.9
22.2
89.4
90.4
90
11
9-4
Lot 7
S.G.
3
98.9
11.8
94.6
95.7
90
12
9-4
Lot 2 Pad Center
-2.0
1
121.3
10.9
98.9
81.5
90
'
13
9-4
Retest of 12
S.G.
1
121.3
5.1
110.3
91.0
90
14
9-4
Lot 1 Pad Center
-2.0
1
121.3
12.2
115.1
94.9
90
15
9-4
lot 1 Pad Center
-2.0
1
121.3
4.2
113.3
93.4
90
'
16
9-5
Lot 2 SW Comer
-2.0
4
110.1
14.9
100.7
91.5
90
17
9-5
Lot 2 NE Comer
-2.0
4
110.1
19.3
102.8
93.4
90
18
9-5
Lot 1 Center
-2.0
4
110.1
18.4
101.2
91.9
90
'
19
9-8
Lot 2 Center
-1.0
4
110.1
17.0
100.2
91.0
90
20
9-9
Lot 2Center
S.G.
1
121.3
10.6
112.8
93.0
90
21
9-9
Lot 1 NW Comer
-1.0
1
121.3
8.6
112.6
92.8
90
'
22
9-9
Lot 1 E Side
-1.0
1
121.3
10.3
109.6
90.4
90
23
9-9
Lot 1 Center
S.G.
1
121.3
13.8
115.4
95.1
90
(S.G.)
Indicates Subgrade.
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Mr. John Gray
Project No. T1064 -C
Appendix Page 3
SUMMARY OF OPTIMUM MOISTURE CONTENT /
MAXIMUM DRY DENSITY RELATIONSHIP TEST RESULTS
ASTM D1557-91
Optimum
SUMMARY OF EXPANSION INDEX TEST RESULTS
Lot No. Surcharge Dry Density
(psf)
Soil
Maximum
Moisture
Soil
Description
Dry Density
Content
Type
(USCS Symbol)
(PCF)
(%)
24.4
Brown Silty Sand (SM)
121.3
10.6
1
125
7.9
18.4
2
Tan Silt (ML)
80.1
18.2
3
Tan Clayey Silt (ML)
98.9
19.5
4
Brown Sandy Silt (ML)
110.1
15.1
5
Tan Clayey Silt (ML)
89.5
18.9
SUMMARY OF EXPANSION INDEX TEST RESULTS
Lot No. Surcharge Dry Density
(psf)
(PCF)
3&4 144
70.4
7 144
102.5
1 & 2 144
118.3
Moisture
Moisture
Condition
Condition
Before Test (%)
After Test (%)
Expansion
Index
24.4
65.3
145
11.7
29.4
125
7.9
18.4
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EnGEN Corporation
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1 SUMMARY OF RECOMMENDATIONS FOR
CONVENTIONAL FOUNDATIONS AND SLABS
(Tract 21430)
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Mr. John Gray
Project No. T1064 -C
Appendix Page 4
Lot Numbers
1& 2
3&4
7
Expansion Index
58
125
145
Expansive Potential
Medium
High
Very High
Minimum Footing Depth Below Lowest
18"
24"
30"
Adjacent Finish Grade
Minimum Footing Width 1 and 2 Story
15"
15"
15"
Structures
Minimum Continuous Footing
1-#4 at Top
244 at Top
245 at Top
Reinforcement
144 at Bottom
244 at Bottom
245 at Bottom
Minimum Slab Reinforcement
#4 at 24" O.C.
#4 at 18" o.c.
#4 at 12" o.c.
Minimum Nominal Concrete Slab
N/A
N/A
N/A
Thickness for Wire Mesh
Minimum Concrete Slab Thickness for Re-
4'/i' Actual
5" Actual
5" Actual
Bars
Minimum Moisture Content of Subgrade
Optimum + 2%
Optimum + 4%
Optimum + 6%
Immediately Prior to Placing Moisture
To a depth of
To a depth of
To a depth of
Barrier or Pouring Concrete
18"
24"
24"
Visqueen Moisture Barrier
10 mil
10 mil
10 mil
1 Notes: " Top and bottom minimum of 5 inches of concrete cover.
"* Reinforcing slabs to be in both directions and tied into the foundation.
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