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S <br /> September 21, 1987 Page 4 Project 195-1.1 <br /> Area ii. (DH-2/MW-2) no diesel was detected in the ground water sample or <br /> the soil sample taken at five feet below ground surface. Trace <br /> pa amounts of two trihalomethanes, chloroform and bromodichloro- <br /> I : methane, were detected in the ground water sample. These <br /> components were present in concentrations well below the <br /> �a established drinking water standard of 100 ppb combined <br /> concentration. These components were not detected in the soil <br /> sample from five foot depth. <br /> �Sn <br /> Area iii. (DH-3) oil at a concentration of 850 mg/kg or parts per million <br /> � * (ppm) w s detected in the soil sample taken at one foot below <br /> ground surface. The sample was taken from the oil stained soil <br /> and the analysis result therefore indicates the worst case <br /> concentration. The area of oil staining is limited in areal <br /> extent. If necessary, the affected soil can be excavated and <br /> �a removed. No volatile organic constituents were detected in the <br /> t soil sample. <br /> Area iv. (DH-4) oil. at a concentration of 76 mg/kg or parts per million <br /> (ppm) was detected in the soil sample taken at one foot below <br /> is ground surface. The sample was taken from the ail stained soil <br /> and the analysis result therefore indicates the worst case <br /> i i concentration. The area of oil staining is limited in areal <br /> jg extent. <br /> f� Conclusions. <br /> Based on the.above.results there does not appear to be any significant <br /> �e <br /> contamination of soil.or ground water at the site as a result of on-site <br /> activities, with the exception of oil found in a limited volume of shallow <br /> t soil`"adjacent to the oil and solvent storage area. <br /> 3� In accordance with your written authorization, a copy of this report is <br /> being sent to .the San Joaquin Local Health District. if you have any <br /> questions concerning the information presented, please call. <br /> � # Respectfully submitted, <br /> BETA ASSOCIATES Reviewed by: <br /> MzCollo h <br /> Andrew L. Wright <br /> �J�. ug <br /> --- - -- - Registered-Geologist-#1559- - - -- <br /> Certified Engineering Geologist 4905 <br /> cc: Mr. Harlan Knoll - San Joaquin Loml Health District <br /> j GBetar Associates_r__�._^ <br />