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Home My WebLink AboutTract Map 21760 GeotechReportPreciseGrading(Oct.19,1995)Geotechnical • Geologic • Environmental t TQ Zt'I6 � ' OCT 24 1995 LING- ' ,T !C1N cR1,'o . GEOTECHNICAL REPORT OF PRECISE GRADING LOTS 6 THROUGH 9, 33, AND 34, TRACT 21760 TEMECULA, RIVERSIDE COUNTY, CALIFORNIA FOR TERRA NOVA CONSTRUCTION COMPANY ' P.O. BOX 612 CORONA DEL MAR, CALIFORNIA 92625 OCTOBER 19, 1995 W. 0. 589 -B -RC 1 '. GeoSoils, Inc. \ H 1 1 1 - Geotechnical • Geologic • Environmental 24890 Jefferson Avenue • Murrieta, California 92564 • (909) 677-9651 • Fax(909)677-9301 Mailing Address: P.O. Box 490 • Murrieta, California 92564 1 October 19, 1995 W.O. 589 -13 -RC Terra Nova Construction Company 1 P.O. Box 612 Corona del Mar, California 92625 1 Attention: Mr. Jim Rossman 1 Subject: Geotechnical Report of Precise Grading, Lots 6 through 9, 33, and 34, Tract 21760, Temecula, Riverside County, California 1 References: 1) "Geotechnical Evaluation of Hydroconsolidation and Settlement Potential, Tract 21760, Temecula, County of Riverside, California," W.O. 589 -A -RC, by GeoSoils, Inc., dated June 7, 1993. 1 2) "Summary of Existing Graded Lots Potentially Requiring Remedial Earthwork, Tract 21760, Temecula, County of Riverside, California," W.O. 1 589 -A -RC, by GeoSoils, Inc., dated March 5, 1993. In accordance with your request, this final geotechnical report of precise grading is 1 provided for lots 6 through 9, 33, and 34 in Tract 21760, in Temecula, Riverside County. The site was previously graded under the observation and testing services of Soil Tech, Inc. (1990). Precise grading within the subject project, under purview of this report, 1 began on October 9, 1995, and was completed on October 19, 1995. Unless superseded by recommendations presented herein, the recommendations contained in our previous referenced reports (GeoSoils, Inc., 1993) remain pertinent and applicable 1 and should be appropriately implemented. PREPARATION OF EXISTING GROUND 1 1. Major vegetation was stripped and cleared from the entire site prior to grading. 1 2. On lot 8: The pad areas and at least 5 feet beyond in each direction were overexcavated 36 inches; and the bottom was then scarified 12 inches, brought to at least optimum moisture content, then compacted to obtain a minimum 1 relative compaction of 90 percent of the laboratory standard ASTM D-1557. 1 V ' Terra Nova Construction Company W.O. 589 -B -RC Tract 21760, Temecula October 19, 1995 ' Lots 6-9, 33, 34 Page 2 ' 3. On lots 6, 7, 9, and 33: The pad area and at least 5 feet beyond in each direction was scarified to a depth of about 12 inches, brought to at least optimum moisture content, then compacted to a minimum relative compaction of 90 percent of the ' laboratory standard ASTM D-1557. 4. On lot 34: The pad areas and at least 5 feet beyond in each direction were overexcavated 6 feet; and the bottom was then scarified 12 inches, brought to at least optimum moisture content, then compacted to obtain a minimum relative compaction of 90 percent of the laboratory standard ASTM D-1557. Fill Placement ' Fills consisted of native onsite materials that were placed in thin 6- to 8 -inch lifts, brought to at least optimum moisture content, then compacted to obtain a minimum relative compaction of 90 percent of the laboratory standard. ' Field Testing 1. Field density tests were performed using nuclear densometer-methods ASTM D- 2922 and D-3017 and sand -cone method ASTM D-1556. The test results are presented in the enclosed Table I. The estimated locations of the field density tests are shown on the enclosed Field Density Test Location Map, Plate 1. ' 2. Field density tests were taken at periodic intervals and random locations to check the compactive effort provided by the contractor. Based upon the grading ' operations observed, the test results presented herein are considered representative of the compacted fill. 3. Visual classification of the soils in the field was the basis for determining which maximum dry density value to use for a given density test. ' 4. Only tests taken on the subject lots are presented herein on Table I. LABORATORY TESTING Maximum Density Testing ' The laboratory maximum dry density and optimum moisture content for the major soil types within this construction phase were determined in general accordance with ASTM test method D-1557. The following table presents the results: GeoSoiis, Inc. ' Terra Nova Construction Company W.O. 589 -13 -RC Tract 21760, Temecula October 19, 1995 ' Lots 6-9, 33, 34 Page 3 ' Maximum Dry Optimum Moisture Soil Tvoe Density ocf Content. % D - Silty Sand, Brown 124.0 12.5 Expansion Index ' Expansive soil conditions have been evaluated for each lot. Representative samples of ' the soils near pad grade were recovered for expansion index testing. Expansion Index tests were performed for the typical foundation soil types exposed at ' pad grade in general accordance with UBC Standard #29-2 as outlined in Section 2904(b) of the Uniform Building Code. These test results are shown below: ' Lots Expansion UBC Classification 6-9 25 Low '33,34 22 Low CONCLUSIONS AND RECOMMENDATIONS ' Recommendations for foundation design parameters, foundation construction, and utility trench backfill were presented in our referenced report, dated June 7, 1993. All findings, ' conclusions, and recommendations remain pertinent and applicable except as superseded herein. REGULATORY COMPLIANCE Processing of original/existing ground and placement of compacted fills under the ' purview of this report have been completed using the observation and selective testing services provided by representatives of GeoSoils, Inc. Earthwork was performed in general compliance with the Grading Code of City of Temecula, California. ' Our findings were made in conformance with generally accepted professional engineering practices, and no further warranty is implied or made. GeoSoils, Inc. ' assumes no responsibility or liability for work, testing, or recommendations performed or provided by others. This report is subject to review by the controlling authorities for ' this project. GeoSoils, Inc. Terra Nova Construction Company Tract 21760, Temecula Lots 6-9, 33, 34 W.O. 589 -13 -RC October 19, 1995 Page 4 We appreciate this opportunity to be of service. If you have any questions, please call us at (909) 677-9651. Respectfully submitted, QROFF.w•,� GeoSoils, Inc. y4��Fti /�®�/ ✓ll w Qa N0.476 �� l D. 6-30-97 / b Albert R. Kleist v - - �',. Civil Engineer, RCE 163,60 C —Ci q '- Geotechnical Engineer, GE - _p_ J44'n Sherry L. Eaton Project Manager SLE/ARK/sh Enclosures: Table I - Field Density Test Summary Plate 1 - Field Density Test Location Map Distribution: (6) Addressee GeoSoils, Inc. TABLE I FIELD DENSITY TEST SUMMARY WORK ORDER: 589 -B -RC TRACT 21160 ELEV TEST DATE LOCATION TEST NO OR CONT DEN REL METH LOT NO. DEPTH 1 PCF COMP 10-03-95 8 -3 2 10-09-95 6 ' 3 10-09-95 7 112.2 4 10-09-95 8 FG 5 10-09-95 9 ' 6 * 10-10-95 34 (Materials Removed) 113.0 6 A 10-10-95 34 (Materials Removed) FG 7 10-10-95 33 N ' 8 10-19-95 34 85.6 N 9 10-19-95 34 109.5 10 10-19-95 34 ' 13.7 11 10-19-95 34 D -5.5 LEGEND: * - Failing_ Test 91.5 N A - FG - Retest Finish Grade 12.6 112.6 N - Nuclear Densometer D -2.0 SC - Sand Cone WORK ORDER: 589 -B -RC TRACT 21160 ELEV MOIST DRY % TEST SOIL OR CONT DEN REL METH TYPE DEPTH % PCF COMP -3 12.6 111.8 90.2 N D FG 12.8 112.2 90.5 N D FG 12.7 114.3 92.2 SC D FG 13.1 113.0 91.1 N D FG 12.9 112.8 91.0 N D FG 21.1 106.1 85.6 N D -2 17.1 109.5 88.3 N D FG 13.7 112.1 90.4 N D -5.5 13.1 113.4 91.5 N D -3.0 12.6 112.6 90.8 SC D -2.0 12.5 114.3 92.2 N D FG 12.5 113.0 91.1 N D GeoSoils, Inc. Z,