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I16 January 2001 <br /> • AGE-NC Project No 97-0290 <br /> Page 6 of 6 <br /> • Benzene was detected in wells MW-2 and MW-4 at concentrations exceeding the State of <br /> California - Department of Health Services maximum contaminant level (MCL) of 1 0 ,ug/I <br /> • Only one oxygenated compound (DIPE) was detected above laboratory reporting limits to <br /> any of the ground water samples analyzed <br /> • The extraction of approximately 440 gallons of hydrocarbons as gasoline and BTEX were <br /> documented during the quarter Continued operation of the SVE should anticipate <br /> diminishing recovery, signifying a reduction of the hydrocarbon impact to soil <br /> 50. RECOMMENDATIONS <br /> IBased on the findings of the environmental activities recounted in this report, <br />' 0 AGE recommends continued monthly SVE/JAS monitoring <br /> • AGE recommends the use of an oxygen release compound in wells MW-4 and possible <br />' MW-5, to stimulate microbial metabolism of petroleum hydrocarbons, which may reduce the <br /> off-site concentration of BTEX, specifically benzene in well MW-4 <br /> C AGE further recommends a reduction of the quarterly ground water monitoring for the site <br /> Ito only wells MW-1 through MW-6 Due to the consistent lack of fuel additive detection, <br /> AGE proposes only to sample and analyze for TPH-g and TPH-d along with BTEX The next <br /> sampling event should be scheduled for late January 2001 <br /> I <br /> I6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based upon <br /> analytical results provided by an independent laboratory Evaluation of the subsurface conditions at <br /> the site for the purpose of this investigation was made from review of a limited number of available <br /> data points (soil vapor and ground water samples) and subsurface conditions may vary away from <br /> these data points No other warranty, expressed or implied, is made as to the professional <br /> recommendations contained in this report <br /> • <br /> Advanced GeoEnvn onmental Inc <br /> I <br />