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Quarterly Report - Fourth Quarter 2004 <br /> RAINWATER CAR WASH <br /> 420 West Yosemite Avenue, Manteca, California <br /> 1.0. INTRODUCTION AND SCOPE OF WORK <br /> At the request of Mr Phil Elder, Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> quarterly report for 420 West Yosemite Avenue, Manteca, California (the site) The report <br /> documents procedures and results for ground water monitoring and interim groundwater remediation <br /> performed at the site between September 2004 and December 2004(fourth quarter) The site setting <br /> is illustrated on Figure 1, site structures and monitoring well locations are depicted on Figure 2 <br /> i ' The enclosed report was prepared in accordance with guidelines established by the Central Valley <br /> Regional Water Quality Control Board (CVRWQCB) for the investigation of underground storage <br /> tank(UST) sites Background information and a description of prior investigations at the site were <br /> ' included in Appendix A of Quarterly Report- Third Quarter 2002, dated 06 December 2002 <br /> The'objectives of the fourth quarter 2004 investigation was to characterize, assess, and monitor <br /> dissolved petroleum hydrocarbons and methyl tertiary-butyl ether(MTBE)concentrations in ground <br /> water,to characterize ground water flow direction and gradient,and to continue interim remediation <br /> through groundwater extraction and treatment at the site The following is a brief summary of fourth <br /> ' quarter monitoring and interim ground water remediation activities performed at the site <br /> • 15 September to 30 December 2004 - Continued pump-and-treat interim remediation <br /> utilizing on-site extraction well EW-1,discharged approximately 300,491 gallons of treated <br /> ground water into the City of Manteca sanitary sewer system <br /> ' • 19 October, 11 November, and 30 December 2004 - Monthly monitoring events at the <br /> ground water extraction and treatment remediation system, extraction well EW-1 was in <br /> operation <br /> 30 December 2004 - AGE performed a quarterly ground water monitoring event (fourth <br /> quarter 2004) at wells MW-1 through MW-13 <br /> 1 <br /> 2.0 GROUND WATER EXTRACTION-TREATMENT REMEDIATION SYSTEM <br /> ' Between 15 September and 30 December 2004,a ground water extraction and treatment system was <br /> in operation at the site for the purpose of ground water interim remediation The ground water <br /> treatment operation and maintenance procedures for the site were outlined in AGE's Interim <br /> Remediation Work Plan -June 2001, dated 21 June 2001 <br /> y S <br /> Advanced GeoE nviron mental,Inc <br />