Laserfiche WebLink
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. 1) 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. Al <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, please contact me at (916) 638-2085. <br />Sincerely, <br />DELTA ENVIRONMENTAL CONSULTANTS, INC. <br />molfllHal Hansen "I % . , � ® V/ <br />A <br />Hydrogeologist/Project Manager <br />j�VoQ <br />Dale A. van Dam, R.G. NO. 4632 <br />California Registered <br />Geologist #4632 ���� <br />HH:DVD:ecd P Qt.. eAt.`�� <br />Enclosures <br />cc/enc: Mr. Salomon Lee, Office of State Architect <br />Ms. Eleanor Ratliff, San Joaquin County Environmental Health Division <br />