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Project No. A-645$2-19 <br />202 E Adrms Ave., Srntr rtrl' CA 92707 <br />Prge: 3 <br />Site Grading and Soil Excevetion <br />The gading was Derformed in accordance with proiect design and recommendations to rernove and <br />recompact a minimum of 4 feet below the existing grade. Soil density test s were provided during <br />the grading operation. <br />On-site clayey sand materials was used to backfill. A limited of borrowed materials were used <br />during the backfill. During the R& R operation stockpiled soils were mixed and controlled to have <br />an optimum moisture conteDt. <br />Field Testing <br />Field density testing was performed to veri& the relative degree of compaction using the nuclear <br />gauge P/BC 201l-28 deosity testing and sand cone tools. A total of 19 tests was conducted after <br />grading. A surnmary oflaboratory and compaction test results is 8ttached herewith. The approximate <br />locations offield density tess are shown on the Compaction Test l,ocation Plan (A-l-l). The fill <br />is considered as primary and structural fill. <br />Crading equipments were used to overexcavate the Droposed buildins area and 5 feet beyond <br />wherever was applicable. The bottom ofthe proposed pad was scarified to a minimum of8 inches. <br />The soil compaction tests indicated that tested fill materials where tested exhibiting more than 90olo <br />relative compaction and therefore are competent. <br />Lrboretory Testing <br />The laboratory maximum dry density and optimum moishre content of each major soil <br />encountcred during grading were daermined in accordance with ASTM Method D-I557-00 <br />results are shown in Table l. <br />t,?e <br />The <br />Table I <br />MAXIMUM DRY DENSITY OPTIMUM MOISTURE <br />Soil Description Cuwe Letter Maxrmum dry dens.Optrmum moishre <br />Sandy clay A 114 17.4 <br />Verification <br />Based on our field and laboratory testing, the building pad and the area compacted during the rough <br />grading appear uniformly compacted, exhibiting at least 90 percent relative compaction. On the <br />basis of the forgoing information together with data supplied in the referenc€d repon, it is the <br />opinion of this firm, that the observed soils have been properly compacted and are mnsidered <br />adequate to be capable of supporting the planned improvements.