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I � <br /> I <br /> 16 28 February 1997 <br /> AGE-NC Project No 95-0144 <br /> ' Page 20 of 20 <br /> 4 � <br /> _ r <br /> Upon approval by the PHS-EHD, a Remedial Action Work Plan should be prepared for the <br /> ' recommended remedial alternatives y <br /> i <br /> 8.0 RECOMMENDATIONS FOR REMEDIATION OF HYDROCARBON- , <br /> IMPACTED GROUND WATER <br /> Ground water,znonitonng at the site indicates that MW-8 is the down-gradient well' The highest „ <br /> concentrations of dissolved hydrocarbons have been consistently detected in MW'1, near the former <br /> ' location of USTs No 3 through 6 Petroleum hydrocarbons have been detected in several other wells <br /> during past monitoring events However, hydrocarbon concentrations have remained relatively low <br /> 'Only benzene concentrations in MW-1 have been consistently above the State of California Division <br /> ' of Drinking Water Maximum Contaminant Levcl,(MCL) of 1 0 ppb The impacted ground water <br /> plume appears to be stable or decreasing and has not migrated ott-site Due to the low hydrocarbon, <br /> concentrations and stable ground water plume, we recommend natural attenuation as the remedial <br /> ' option for ground water at the site <br /> Ground water clean-up goals should correspond with State of California MCLS However, if a stable , <br /> or decreasing plume can be demonstrated, higher contaminant concentrations may be left in place <br /> Ground water remediation alternatives, estimated durations and associated costs for the site are <br /> ' summarized on Table 9 <br /> 9.0. 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 Evaluations of the geologic/hydrogeologic <br /> ` conditions at the site for the purpose of this investigation are made from a limited number of <br /> ' available data points (i a monitoring wells, soil borings) and subsurface conditions may vary away <br /> from these data points No other warranty, expressed or implied, is` made as to the professional <br /> ' recommendations contained in this report <br /> I I ' <br /> I t ' <br /> I <br />