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KEI-J86-084 <br /> September 12 , 1986 <br /> Page 4 <br /> RECOMMENDATIONS <br /> Although the concentrations of gasoline constituents exceed the <br /> Regional Water Quality Control Board guidelines and DOHS minimum <br /> standard for drinking water, we do not believe that a full scale <br /> clean up of the dissolved plume in the shallow ground water is <br /> necessary at this time . This opinion is based on the following <br /> facts : 1 ) No free product was observed in the monitoring wells ; <br /> 2) The shallow ground water in the vicinity of the site is not <br /> used for domestic purposes ; and 3) The deeper useable aquifer is <br /> well protected by an extensive layer of clay. <br /> In lieu of full scale shallow ground water clean up , KEI <br /> recommends the following: <br /> 1 ) Installation of three to four additional wells directly <br /> downgradient from the wells MW-3 and MW-4. Samples from <br /> these wells will indicate whether a significant contaminant <br /> plume exists beyond the property line. <br /> 2) Sampling private wells (down gradient) within a 1/2-mile <br /> radius . <br /> If the additional investigation indicates that ground water is <br /> free of hydrocarbon contamination, it is likely that the <br /> contamination plume has not spread significantly and it may be <br /> contained at the site. A proposal for further remedial action <br /> will be submitted after reviewing the result of additional wells <br /> installation and sampling . <br /> Should you have any questions, please do not hesitate to contact <br /> me at (415) 228-1882 or 372-5444. <br /> Sincerely, <br /> MARDO KAPREALIAN, P.E. <br /> President <br /> MK/ks <br /> Attachments : Location Map <br /> Boring Logs <br /> Laboratory Analyses <br /> cc : C. Galloway <br />