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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 jet fuel (Sample NO I) and <br /> ' 3,500 ppm TPH as diesel and 5,100 ppm TPH as Jet fuel (Sample No 4) These two soil samples were <br /> collected at a depth of approximately 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 5 5 feet below the <br /> concrete slab contained 11 ppm TPH as diesel and 14 ppm TPH as jet 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 in 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, lease contact _ <br /> p t me at (916) 638 2085 <br /> ' Sincerely, <br /> DELTA ENVIRONMENTAL CONSULTANTS, INC. <br /> Hat Hansen , BRED G�r� <br />' Hydrogeologist/Project Manager � VA <br /> 7r 4 <br />' Dale A. van Dam, R G � NO. 4632 <br /> California Registered >�k <br />' Geologist #4632 C�+� <br /> HH DVD eed �4Z <br /> Enclosures <br />' cc/enc- Mr Salomon Lee, Office of State Architect <br /> Ms Eleanor Ratliff, San Joaquin County Environmental Health Division <br /> I <br /> I <br />