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June 20, 1988 <br />Lagerlof construction co. <br />1609-L East Edinger <br />santa Ana, california 92705 <br />Attention: Mr. Lagerlof <br />subj ect :Geotechnical Testing for <br />on-site Exterior Se$rer and water Trenches <br />and on and off-Site Exterior Conmon Electric <br />and Telephone Trenches <br />Xleen1ine Industrial Building <br />3220 South Fairview street <br />Santa Ana, cal i fornia <br />Dear 1,1r. Lagerlof : <br />This letter presents the results of density testing <br />perforrned by this firm in the backfill of the on-site <br />exterior se\^rer and water trenches and in the backfill of the <br />on and off-site exterior conmon etectric and telephone <br />trenches at the subject project. Please refer to our letter <br />dated April 26, 1,988 for prior interior sewer trench density <br />tests . <br />The sewer trench was reported to be 4 feet in depth. our <br />tests are linited to the upper 2 feet of the trench. <br />The water trench was reported <br />our tests are lirnited to the upper one <br />be <br />feet <br />to be 2 feet in depth. <br />foot of the trench. <br />The <br />3.5 <br />of <br />conmon electric and telephone trench r.ras reported to <br />feet in depth. our tests are limited to the upper 1,.5 <br />the trench. <br />The density of the soil was determined in accordance <br />with A.s.T.l,t. Test uethod D-2937. The results were compared <br />to the maxj,mum density as deterrnined in accordance with <br />A.S.T.l,t. Test llethod D-1.557. The results are presented on <br />the attached I'TabIe of Test Resultsrt with the approximate <br />test Locations shown on the attached plot plan. <br />Page 1 <br />GEOTECHN ICAL ENGIN EERING 17141 MURPHY AVENUE 1.714) 474.2001 <br />il <br />KENNETH G. OSBORNE & ASSOCIATES <br />Job No. 4871. <br />I <br />lr IBVINE. CALIFORN IA 92714