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v - <br /> . A S S O C I A T E S I N C <br /> CONCLUSIONS <br /> Concentrations of petroleum hydrocarbon constituents decreased slightly in well MW-3 and <br /> remained at non-detect In well MW-6 It appears as though there is residual petroleum <br /> hydrocarbon contamination remaining in the soil <br /> The direction of groundwater flow and the magnitude of hydraulic gradient are generally <br /> consistent with previous quarters <br /> RECOMMENDATIONS <br /> Based on the results of the second quarter 1998 monitoring episode, we recommend the <br /> following <br /> o Conduct the Third Quarter 1998 groundwater monitoring and sampling of wells MW-1 <br /> through MW-6 <br /> o Continue to analyze the groundwater samples from well MW3 for MTBE <br /> • o Discontinue analyzing the groundwater samples from all wells for oxygenate fuel <br /> additives <br /> Please contact our office at (209) 579-2221 if you have any questions or comments <br /> Respectfully Submitted, ENVIRONMENTAL HEALTH DIVISION <br /> ATC Associates Inc 304 E Weber Ave Third Floor <br /> P O Box 388, Stockton CA 95201-0388 <br /> Approved <br /> V dam-- Denied ❑ <br /> 1_J/Conditions -_ <br /> Drew Van Allen <br /> fo by <br /> Staff Scientist G ESSlc�4 <br /> jLY <br /> r'n m4 <br /> Jeanne Homsey, '0, � � 110 <br /> CA Registered Civil Engineer No 47410 Exp — 1245!Z Z.e7Uft 11' 6)OV400h l <br /> cc Gerald Thiemann .�j G I V I L < q�\P VD b�� P W <br /> Elizabeth Thayer, RWQCB �' 0ff 5� I� <br /> W 1626051quart1y12gr-1998 doc 3 <br />