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Well MW-5, located crossgradient from the former USTs, was sampled once since sampling was <br /> reinitiated. Well MW-5 contained no detectable concentrations of petroleum hydrocarbons <br /> Well MW-6, located downgradient from the former USTs, contained no detectable <br /> concentrations of TPHg and TPHd during the last four sampling events MW-6 had one event <br /> t with detectable levels of benzene, toluene, and xylenes during the last foursampling events In <br /> March 1994, benzene was detected at 1 1 ppb, dust above the Maximum Contaminant Level <br /> (MCL) for drinking water of 10 ppb Toluene was detected at 0 59 ppb, well below the State <br /> Action Level for drinking water of 100 ppb Xylenes were detected at 0.71 ppb, well below the <br /> MCL of 1,750 ppb <br /> ' RECOMMENDATIONS <br /> Based upon the findings and conclusions of this and previous groundwater monitoring episodes, <br /> ' RESNA recommends that groundwater monitoring be discontinued and the wells be abandoned <br /> in accordance with SJCPHS approved methods <br /> SCHEDULE <br /> i <br /> ' The next groundwater monitoring event is scheduled for March 1995 Upon approval of <br /> groundwater closure by SJCPHS, monitoring will be discontinued, the appropriate well <br /> destruction permits will be obtained, and the wells will be abandoned <br /> DISTRIBUTION <br /> ' Copies of this report will be forwarded to the following regulatory agencies involved in this <br /> project: <br /> ' Ms Linda Turkatte, Environmental Health Specialist <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> ' P O. Box 2009 <br /> Stockton, California 95201 <br /> ' Ms Beth Thayer, Water Quality Engineer <br /> Regional Water Quality Control Board <br /> Central Valley Region <br /> ' 3443 Routier Road <br /> Sacramento, California 95827-3098 <br /> 1 <br /> 54W561QUARTLYI4QMR1994 FNL 4 <br /> Canonze E nv i r on menta l <br />