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CLEARWATER <br /> G .RO U- P, .'j: N C. <br /> 5.0 RECOMMENDATIONS f <br /> Results of.-anal analysis of groundwater samples collected during this hase of activi are <br /> Y �' P g P activity <br /> are <br /> with those of the previous sampling event. Gasoline constituents were <br /> not detected in any of thea samples analyzed, although samples .from. all three wells <br /> R contained TPHd. <br /> On the basis of available. information, Clearwater recommends. the following <br /> additional site assessment at-'the subject location: { <br /> = Investigate soil contamination in the vadose zone by drilling and sampling,an <br /> additional soil boring near.the.former. fuel dispensers; prior to submitting a <br /> workplan, Clearwater'will confirm the.location of.the former dispenser area with <br /> personnel from theCity of,Ripon corporation yard <br /> - Assess-thegroundwater- radient and ground, ater ualit3more rthoroughly by <br /> installing three.or four additional monitoring.wells; the wells will be placed in <br /> locations that willrovide additional iinform�tion ere ardin the size of the <br /> P .- g g <br /> - groundwater plume and,the local groundwater gradient: <br /> Clearwater requests that the.San Joaquin County PHS/,EHD review this conceptual <br /> approach to the continued investigation' of the site. �If the PHS/EHD concurs, a <br /> formai workplan will be submitted•by Clearwater-and implemented upon receiving <br /> approval.from-PHS/EHD. <br /> In addition, please provide Clearwater .with the current PHS/EHD -guidelines <br /> regarding TPHd concentrations in groundwater: We.,are aware or no State drinking <br /> -water action levels forTPHd,• however, the P S/EHD may have cleanup .goals for <br /> areas within their jurisdiction. <br />(' 6.0 ' CERTIFICATION <br /> This, report was prepared under the super vision, of a .professional 'registered. <br /> geologist at Clearwater. Group, , Inc. All statements, -conclusions and <br /> recommendations are based solely upon field observations and analyses performed. <br /> by'a state-certified laboratory related.to the work performed by Clearwater Group, <br /> Inc. Clearwater Group,.Inc. isnot responsible for laboratory errors. <br /> D-104 2Q95 3' July 14;1995: . <br />