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I <br /> S <br /> r <br /> Jr <br /> Mr Bill Gard <br /> December 17, 1990 <br /> Page 2 <br /> Two soil samples were collected on January 17, 1990, (see figure) by Blaine Tech Services, Inc, from <br /> the north end of the former underground storage tank excavation. These samples contained 1,500 ppm <br /> total petroleum hydrocarbons (TPH) as diesel and 1,600 ppm TPH as let fuel (Sample NO 1) and <br /> 3,500 ppm TPH as diesel and 5,100 ppm TPH as let fuel (Sample No. 4) These two soil samples were <br /> collected at a depth of apprommately 2.75 feet below the concrete slab <br /> Only one of the three soil samples collected on October 24, 1990, contained measurable amounts of <br /> petroleum hydrocarbon constituents The sample collected from hand boring HB-3 at 5S feet below the <br /> concrete slab contained 11 ppm TPH as diesel and 14 ppm TPH as het fuel. <br /> Based on the most recent analytical results, it appears that concentrations of petroleum hydrocarbon <br /> constituents greater than 100 ppm TPH are present only to soils between approximately 2.5 and 5 feet <br /> below grade beneath the north side of the concrete slabs. <br /> If you have any questions regarding this matter, please contact me at (916) 638-2085. <br /> Sincerely, <br /> DELTA ENVIRONMENTAL CONSULTANTS, INC. <br /> Hal Hansen �. QED GHQ` <br /> HydrageologtstJProlect Manager �. VA/y4Q�j, <br /> Y--L I-� :.A <br /> Dale A. van Darn, R.G ;r NO. 4632 � <br /> California Registered <br /> Geologist #4632 <br /> HH DVD ecd GF CA1.���� <br /> Enclosures <br /> cc/enc- Mr Salomon Lee, Office of State Architect <br /> Ms. Eleanor Ratliff, San Joaquin County Environmental Health Division <br />