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4� <br /> a•�. SI <br /> • Mr. Jerry Moore Project 2520-100.001 <br /> April 14, 1995 <br /> Page 3 <br /> GROUNDWATER REMEDIATION SYSTEM <br /> The groundwater remediation system startup was conducted on January 23, 1995. <br /> Groundwater influent and effluent samples were collected on January 23 and February 14, 21, <br /> and 28, 1995, to illustrate compliance with Land Discharge Permit Order No. 91-25013. <br /> Table 3 presents the analytical results of the groundwater compliance sampling. As the <br /> analytical results of the four samples indicate less than detectable concentrations in effluent, <br /> EMCON proposes to switch to monthly sampling. Since system startup, a total of <br /> 76,000 gallons of groundwater have been treated. An estimated total of 1.52 pounds of total <br /> petroleum hydrocarbons as gasoline have been removed from the groundwater. Attachment C <br /> presents the field data sheets. Attachment D presents the analytical results of groundwater <br /> treatment system <br /> The system is currently off due to clogging of the filters. EMCON is currently working on <br /> solving the problem The treatment system will be brought on line as soon as the problem is <br /> resolved. <br /> GROUNDWATER REINJECTION WELL INSTALLATION <br /> As part of the groundwater remediation system, EMCON installed two groundwater <br /> reinjection wells. Before starting field activities, EMCON obtained the applicable drilling <br /> and well installation permits from the San Joaquin County Public Health Services <br /> Environmental Health Division (PHS-EHD). <br /> Exploratory soil borings RW-1 and RW-2 were each drilled to depths of 45 feet and <br /> converted to groundwater reinjection wells by installing 4-inch-diameter, flush-threaded, <br /> polyvinyl chloride (PVC) well casing having 0.020-inch machine-slotted screen. <br /> Exploratory boring logs and well construction details, and drilling and monitoring well <br /> installation procedures are presented in Attachment E and Attachment F, respectively. <br /> The wells were connected to the remediation system piping by installing a 4-inch-diameter <br /> PVC tee to the well casing at approximately 30 inches below ground surface. <br /> SA(NN,\PJZ\2520N25201000.I PS-94\11b;1 <br />