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Home My WebLink About; Carlsbad Oaks Business Center Lot 8; Soils Report; 1987-09-23- - SAN DIEGO GEOTECHNICAL CONSULTANTS, INC. SOIL ENGINEERING 8 ENGINEERING GEOLOGY - September 23, 1987 - - - Kaiser Electronics Job No. 05-6807-001-02-10 2701 Orchard Parkway Log No. 7-2247 San Jose, California 95134 ~~~~.EERING DEPT. LIBRAR\ Attention: Mr. John Balkwill ,$ily of Carlsbad 2V5 Las Palmas Drive SUBJECT : SOILS COMPACTION REPORT &&bad CA92009-4859' Kaiser Electra-Optics Facility Carlsbad Oaks Business Center, Lot 8 Carlsbad, California - - - - - - - - - - References: San Diego Soils Engineering, "Geotechnical Investigation, Proposed Commercial Development, Lot 8, Carlsbad Oaks Business Center, Carlsbad, California". Job No. 05-6807-001-00-00, dated January 5, 1987 Gentlemen: Submitted herein is a report of observations and tests performed during placement and compaction of fill at the subject site. Field densitv tests are presented in Table I, "Results of Compaction Tests". Test locations are shown on the attached Site Plan, Plate 1. The Civil Engineer and grading contractor were Rick Engineering, Co., and Dunphy Construction, respectively. Mass grading was started and completed to finished grade during the period covered by this report, September 4 to September 17. 1987. 1 .o SCOPE OF WA“-. In-grading services consisted of the following items: a. Observation of site preparation. b. Observation and testing of fill placement. C. Preparation of this report. 6455 NANCY RIDGE DRIVE l SUITE 200 l SAN DIEGO, CALIFORNIA 92121 . (619) 567-0250 - - - .-. - - - - - - - - Kaiser Electronics September 23, 1987 Job No. 05-6807-001-02-10 Log No. 7-2247 Page 2 2.0 GRADING OPERATION Grading on this project was based upon the lines, grades, and layouts which are shown on "Grading Plan for Kaiser Electra-Optics" by Rick Engineering Company. Grading procedures were essentially as follows: a. Removals of surficial vegetation, trash, etc. b. Moisture conditioning, scarification, and recompaction of approximately 6 inches of exposed natural subgrade soils. C. Placement, moisture conditioning, and compaction of on-site soils in uniform lifts. 3.0 GEOLOGIC SETTING The geology of the site consists of Santiago Formation sandstone, and claystone. Groundwater was not encountered at the time of the preliminary investigation, or during grading. 4.0 SOIL TYPES On-site soils consisted primarily of gray to brown, silty sand, clayey sand and sandy clay. Table II presents a tabulation of the soil descriptions and relevant engineering properties. - - - - - - - - - - - - Kaiser Electronics September 23, 1987 Job No. 05-6807-001-02-10 Log No. 7-2247 Page 3 5.0 FILL PLACEMENT Fill was placed in 6 to g-inch lifts, brought to approxi- mately optimum moisture content, and compacted to a minimum of 90 percent of maximum dry density as determined by ASTM: D1557-78. The maximum fill depths were about 3 feet. Equipment used for compaction consisted of a bulldozer and scraper for spreading, and a sheepsfoot and blade for compaction and leveling. Grading operations were started and completed during the period covered by this report. Moisture and density tests were made in accordance with ASTM D1556-82 (Sand Cone Method) and ASTM D2922-81 and D3017-78 (Nuclear Method). Maximum Density and optimum moisture content determinations of the various soils are present in Table II, "Laboratory Test Results." 6.0 CONCLUSIONS Based on the results of the observations and testing noted herein, it is our opinion that the grading and compaction was performed in general accordance with our recom- mendations. The conditions at the site was found to be consistent with those indicated in the referenced qeotechnica~l evaluation. Therefore. the recommendations contained in the referenced report are valid and should be fully complied with. Utility trench and/or wall backfill consisting of the on-site material types should be placed by mechanical compaction to a minimum of 90 percent of maximum density (ASTM D1557). - - - - - - - - - - - - Kaiser Electronics September 23, 1987 Job No. 05-6807-001-02-10 Log No. 7-2247 Page 4 All foundation excavations should be observed by the Soils Engineer prior to placement of forms, reinforcement or to determine that soil bearing conditions are as anticipated. All excavations should be trimmed neat, level, and square. All loose or slough material should be removed prior to the placement of concrete. Materials from footing excavations should not be spread in slab-on-grade areas unless compacted to a minimum relative compaction of 90 percent (ASTM D1557). 7.0 LIMITATION OF INVESTIGATION Our description of grading operations, as well as observations and testing services herein, have been limited to those grading operations performed between September 4, and September 17, 1987. No representations are made as to the quality or extent of materials not observed, or for any subsequent changes made to this site. Elevations and test locations noted in the attached Table I are estimated from field surveys done by others. Based upon our observations and testing, it is our opinion, as afore- mentioned, that the work performed has been accomplished in accordance with our recommendations as well as the requirements of the regulating agencies. This report should be considered sub.ject to review by the controlling authorities. ~--' Professional judqements represented in this report are based partly on our evaluations of the technical information gathered, our understanding of the proposed construction, and our general experience in the geotechnical field. Our engineering work and judgements rendered meet or exceed the standard of care of our profession at this time. No other warranty, expressed or implied, is made as to the conclusions and professional advice included in this report. - - - - .- -. - - - - - - - - - - Kaiser Electronics September 23, 1987 Job No. 05-6807-001-02-10 Log No. 7-2247 Page 5 The opportunity to be of service is appreciated. If you have any questions, please call. Very truly yours, SAN DIEGO SOILS ENGINEERING, INC. Robert M. Pintner Staff Engineer Expiration Date: Chief Engineer RMP/AFB/pb Distribution: (6) Addressee Attachments: Tables I through II Site Plan, Plate 1 .__ - - - - - - - - -. TABLE I RESULTS OF COMPACTION TESTS ,sfiJ;6807-O01-02-~\ME: Kaiser Electra-Optics DATE: Sew 1987 MOISTURE UNIT DRY RELATIVE EST NO. DATE EL;;;;!&N COM:NT DENSITY COMPACTION “IL (PCF) (a) TYPE 1 9-9-87 382.0 17.7 94.0 781 2 See Test No. 3 2 9-9-87 381.0 14.0 108.0 90 2 3 9-10-87 382.0 19.0 96.5 ao* 2 See Test No. 9 4 g-10-87 382.0 20.8 100.3 84* 2 See Test No. 5 5 9-11-87 382.0 18.9 104.4 87" 2 See Test No. 8 6 9-11-87 382.5 20.0 108.5 30 2 7 9-11-87 382.5 13.8 109.0 91 2 a 9-12-87 382.0 21.4 99.5 83* 2 See Test No. 10 9 9-12-87 382.0 18.1 99.2 83" 2 See Test No. 11 10 9-14-87 382.0 19.1 102.3 85* 2 See Test No. 12 11 9-14-87 382.0 19.7 103.2 86 2 See Test No. 13 12 9-15-87 382.0 13.3 102.9 8a* 1 See Test No. 14 13 9-15-87 382.0 14.3 104.1 88 4 See Test No. 15 14 9-16-87 382.0 13.9 105.6 90 1 Retest of No. 12 15 9-16-87 382.0 11.1 107.8 91 4 Retest of No. 13 16 9-16-87 383.0 10.0 116.2 97 2 17 9-l 6-87 382.5 10.7 113.2 94 2 18 9-17-87 383.0 14.3 108.5 92 4 19 g-17-87 383.0 14.5 111.9 93 2 20 g-17-87 383.0 17.2 105.7 90 1 21 9-17-87 383.0 14.4 108.6 92 1 SEE PLAN FOR TEST LOCATIONS ‘SAND-CONE TEST. ALL OTHERS NUCLEAR DENSITY TESTS ‘TEST FAILED, SEE RETEST SAN nlFnn CzEnTccYUtCAI PrlUClll TbLITE IMC -.... -.--- ---.-- . . . . . --- -“..““-,-..I Y, . ..“. ., .~. .,._ -. - - - - - - -- ..- TABLE II LABORATORY TEST RESULTS 05-6807-001-02-10 OB NO.: NAME: Kaiser Electra-Optics SOIL TYPE CLASSIFICATION DATE: Sept 1987 MAXIMUM OPTIMUM “:E:’ MOISTURE (96) 1 Gray-white silty fine SAND 117.5 12.7 2 Light brown-yellow slightly clayey SAND 120.1 11.2 3 Gray SZLTSTONE with sand and orange stain 110.0 16.5 4 Yellow-brown sandy CLAY/clayey SAND 118.3 12.0 -- SAN DIEGO GEOTECHNICAL CONSULTANTS, INC :.