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J. H.['%,LEI N FELDER & ASS&�'ETES GEOTECHNICAL CONSULTANTS • MATERIALS TESTING LAND & WATER RESOURCES 2825 EAST MYRTLE STREET STOCICTON,CA 95205.4794 (209)948.1345 File No. S-1773-9/8 March 7, 1985 19(9 M-A Diamond Lumber, Inc. 224 North Main Street Lodi, California 95241 MAR 1 3 Attention: Mr. Mark Morton ENvfhUMENTAL HEALTH PERMIT/SmIlm Subject: SOIL BORINGS AND GAS CONTENT TESTS DIAMOND LUMBER, INC. LODI, CALIFORNIA P.O. NOS. 8889 AND 8583 Gentlemen: In this letter are presented the results of soil borings and gas content tests performed to determine the extent of gasoline contamination in soils beneath recently removed gasoline tanks. Our services were performed in response to gasoline observed in the soils and a small leak discovered in one of the tanks during removal. Representatives of our firm drilled one test boring on February 19, 1985, adjacent to the open pit where tanks had recently been removed, and one boring in the pit on February 27, 1985. The test borings extended to maximum depths of 21 and 20 feet below existing ground surface. Soil samples were obtained in order to observe and test for gasoline content. Samples were obtained by driving a 2-inch inside diameter sampler into the soil using a 140-pound hammer falling approximately 30 inches. Soil samples were capped with aluminum foil and plastic caps, and kept cool until delivery to the laboratory for gasoline content testing. In general, the soil conditions encountered consisted of silty sands near the surface grading cleaner at depths of approximately 7 feet. Relatively clean sands extended to a depth of approximately 18 feet where very dense, partly cemented sandy clay and silt soils were encountered to the maximum depth explored at 21 feet. No gas odors were detected in soil samples obtained at 10, 15, and 20 feet adjacent to the pit. A strong gas odor was detected in the sample obtained at 13 feet and a slight gas odor was detected in the sample at 17 feet in the pit. No gas odor was detected in the sample obtained at 19 feet in the pit. No free groundwater was encountered in the test borings. More detailed descriptions of the soil conditions encountered in the test borings are pre- sented on Plates II and III. All soils have been classified according to the Unified Soil Classification System presented on Plate L OTHER OFFICES: L�►l Fairfield 0 Sacramento 0 Walnut Creefc • Fresno 0 Merced Reno 0 las Vegas 0 St. George. Utah