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mum <br /> f <br /> t 7-Eleven/Stockton <br /> February 1989 15 <br /> GROUNDWATER REMEDIATION SYSTEM <br /> I <br /> Groundwater is currently being extracted from pumping well 1 <br /> (PW-1) and recovery well. 1 (RW-1) , PW-1 is pumping at a rate of <br /> less than 0.5 gallons per minute (qpm) , and is incapable of <br /> sustaining this rate continuously. The pump in RW-1 is pumping <br /> at approximately 1.5 to 2.0 <br /> gpm continuously. A total of 98,039 <br /> gallons of groundwater was pumped and treated during this <br /> The areas that the period. <br /> Pumping is influencing are illustrated on the <br /> previously referenced groundwater gradient maps (Figures 3, 4, <br /> { and 5) . No free product has accumulated in the pumping or <br /> monitoring wells during this reporting period. Measurements of <br /> 11 the free product storage tank water and product levels are <br /> F � tabulated in Table 4 (Appendix I) , Product level measurements <br /> are recorded on each site visit to monitor the tank integrity. <br /> l..y <br /> Groundwater extracted from the pumping wells is treated <br /> through an air-stripping tower prior to discharge to the sanitary <br /> t3 <br /> sewer system. Every two weeks, laboratory analyses are conducted <br /> # on the influent-to and effluent-from the air-stripping tower for <br /> y"9 concentrations of BTEX and TPH4as-gasoline to verify compliance <br /> with requirements imposed by the Stockton Municipal Utilities <br /> .� District and the San Joaquin County Air Pollution control <br /> District. The influent and effluent concentrations of BTEX and <br /> k: TPH--as-gasoline are tabulated on Table 2 (Arpendix 1) and the <br /> laboratory results are included in Appendix IIT. The air- <br /> stripping tower effluent samples were below the laboratory MDL <br /> for BTEX and TPH-as-gasoline during each sampling interval <br /> k,s conducted during this reporting period. In addition to the BTEX <br /> and TPH-as-gasoline analyses, the air-stripping y � tower effluent is <br /> sampled every two weeks for total lead. The total lead results <br /> w <br /> -' GNU1:NIMATER <br /> TroemtoGj.hr. <br />