HomeMy WebLinkAboutParcel Map 13888 Parcel 2-4 Grading & Compaction Control
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CALIFORNIA GEO TEK, IrK.
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Soil Engineering. Civil Engineering. Geology. Testing
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GRADING AND COMPACTION CONTROL
PARCELS 2, 3 AND 4, PARCEL MAP 13888
RANCHO CALIFORNIA
RIVERSIDE COUNTY, CAlIFO~~IA
Project No. 8S3WRC-152
June 25, I95%~
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Prepared for:
Mr. Hike Peruchetti
30551 Pauba Road
Temecula, California 92390
Prepared by:
CALIFORNIA. GEO TEK, INCORPOP~TED
42030 Avenida Alvarado, Suite A
Rancho California, California 92390
(714) 676-2782
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CALIfORNIA GEO TEK, INC.
42030 Avenida Alvarado. Suite A . Rancho California. CA 92390. (714) 676-2782
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June 25, 1986
Project No. 8S3WRC-152
1 NTRODUCTION
The compacted fill on the subject parcels has been test,d for compliance
with applicable County specifications. The work was authorized by Mr. Mike
Peruchetti and included: (I) inspecting the clearing and stripping,
(2) inspecting the keyways, (3) inspecting and testing the compacted fills,
and (3) preparing this report presenting the findings, conclusions and
recommendations.
Plate 1 - Test Location Plan (not-to-scale)
Appendix A - t~axill1um Density Curve
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8S3WRC-152
Page 2
FINDINGS
Proposed Development
A single family residence is proposed for construction on each parcel.
Site Conditions
The site is located at the southwest corner of the intersection of Pauba and
Showalter Roads. The general terrain slopes to the southwest at an average
gradient of 30 percent. The slopes were covered with annual grasses. There is
an existing barn in the southern portion of Parcel 2.
Grad.iJlg
The reference for grading was a grading plan prepared by ToMac Engineering
(Temecula). The earthwork was perfor:ned by Marshall Tractor (Escondido) from
May 30 through June 6, 1986. The equipment used was a Caterpillar DSK dozer and
a scraper. The native grasses were removed and were not used in the fill
materials. A keyway, 18 feet wide and dipping into the natural slope at 2
percent, was excavated along the toe of each fill slope. The bench subgrade
soils were conditioned prior to backfill and fill placement. The fill on
Parcels 3 and 4 was placed as one unit and our tests represent the compactive
effort for that entire zone of fill.
The fill materials were obtained f~om the cut area of the pads. The soils are
silty sands and were placed in lifts of 6 to 8 inches in uncompacted thickness,
~roperly moistened and compacted. The max~mum fill depth is approximately 12
feet, with a ~aximum cut of approximately 12 feet.
The grading differed from the grading plan in that the southerly cut slope on
Parcel 4 was not graded. The fill portions of Parcels 3 and 4 are approximately
2 feet lower in elevation than the cut portions of those pads, and the fill toe
on Parcel 2 has been moved approximately 36 feet to the north. The actual field
conditions are shown on Plate I.
Co~caction Testinq
The tests were performed in accordance with ASTM D1556-82 and ASTM 02937-83 with
the ~aximum density determined in accordance with ASTM DI557-78. The test
locations are shown on Plate 1 and the results are summarized below:
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8S'3WRC-152
Page 3
Test Dry Density, pcf Moisture, % Relative
~ Deoth11 Field Max Field Opt Compaction. %
Parcel 2
621 10.0 BFG 116.7 128.5 9.6 9.0 91
7 1. 0 BFG 113 .0 128.5 6.5 9.0 88
7A31 0.8 BFG 119.6 128.5 12.5 9.0 93
8 4.0 BFG 116.2 128.5 7.8 9.0 90
9 7.5 BFG 117.2 128.5 6.5 9.0 91
Parcel 3
3 5.0 BFG 117.8 128.5 9.0 9.0 92
Parcel 4
121 . 10.0 BFG 121.8 128.5 10.0 9.0 95
2 8.0 BFG 116.5 128.5 10.8 9.0 91
4 4.0 BFG 105.8 128.5 8.0 9.0 82
.4,;31 4.0 BFG 118.0 128.5 9.0 9.0 92
5 I. 5 BFG 115.4 128.5 8.5 9.0 gO
II BFG - Below finish grade to center of test, feet
21 Keyway backfi 11
3/ Denotes a retest
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8S3WRC-152
Page 4
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CONCLUSIONS AND RECOMMENDATIONS
Conclusions'
1. The site was properly stripped prior to. the precompaction and fill
placement.
2. A keyway, 18 feet wide and ;dippi~g into the natural slope at 2 percent, was
excavated along th~ toe of each fill slope:
3. The vegetation was removed from the fill areas and was not used in the fill.
4. The fills have been compacted to a minimum relative compaction of 90 percent
on each parcel, based on ASTM Dl~57-78 (unweighted average = 91.4 percent OQ
Parcel 2 and 91.8 percent on Parcels 3 and 4).
5, The maximum fill thickness is approximately 12 feet in vertical dimension.
6. The maximum cut is approximately 12 feet in vertical dimension.
7. The pads are transition pads (i.e., cut and fill running through the pads).
8. The grading differed from the grading plan in that the southerly cut slope
on Parcel 4 was not graded, the fill portions of Parcels 3 and 4 are
approximately 2 feet lower in elevation than the cut portions of those pads,
and the fill toe on Parcel 2 has been moved approximately 35 feet to the
north.
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8S3WRC -152
Page 5
;Recommendations
2.
1. A soil bearing value of 1500 psf may be used for footings 12 inches in width
and 12 inches in depth, measured below the lowest adjacent compacted or firm
natural grade. This value may be increased to 1800 psf for footings 15
inches in width and 18 inches in depth, measured below the lowest adjacent
compacted or firm natural grade.
All perimeter footings shall incorporate one No.4 bar running continuously
through the footings. The bar'shall be lapped a minimum of 20 bar diameters
and shall be placed approximately 3 inches from the bottom.
3.
Slab-on-grade concrete construction should be 4 inches nominal thickness and
should incorporate 6 x 6 No. 10/No. 10 WWF. Where moisture sensitive floor
coverings are proposed a moisture barrier, such as 6 mil Visqueen should be
used. This membrane should be protected with one inch of sand placed above
and below.
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Respectfully submitted,
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Bruce R. Lee
RCE 23396
CE/tb
Distribution: Addressee (4)
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APPENDIX A
1785 Pr{ F '100/. /1tJ/JTtWE
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10 15 20 25
MOISTURE CCNTENT (% O!=- DR~' WEIGHT)
ZERO .4iR VOI:S C~..:R\'ES
2.70
2. E.D
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