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I <br /> I I . I <br /> Quarterly Report Fourth Quarter 2002 ,1 <br /> II I <br /> I� , ti I I � � I <br /> III RAINWATER CAR WASH ' , r <br /> `IF i ' Idl � k <br /> 420 West Yosemite Avenue, Manteca, California ; I <br /> II ' t I 11 ` � ` �jl• F k ''� I E I f <br /> 1.0. I INTRODUCTION AND SCOPE OF WORK <br /> S <br /> ' At the request;of,Mr �Phil Elder;'Advanced GeoEnvironmental, Inc (AGE) has 'prepared this <br /> quarterly report for 420 West 'Yosemite IAveriue (the site), Manteca, California The report I '' <br /> documents procedures and results for ground water monitonng and rntenm ground water remediation <br /> performed at tlie 'site between Se tember and December'2002 fourth quarter) The site setting is I <br /> 1 p {I p (fourth <br /> q ) r g it <br /> illustrated on Figure 1, site structures an&monitonng well locations are depicted on Figure 2 r ' <br /> The enclosed report'was prepared in accordance with guidelines established by the California <br /> Regional Water Quality Control Board (RWQCB) for investigation of underground storage tank <br /> II(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 /> E ' <br /> The objectives the of fourth quarter investigations were to charactenze,assess and monitor dissolved <br /> I ' petroleum hydrocarbons'and methyl tert-butyl ether (MTBE) concentrations in ground water; to <br /> characterize ground water flow direction and gradient and to continue ground water pump-and-treat, I ' <br /> I interim remediation at the site The following is a brief summary of fourth quarter site assessment <br /> ' and interim ground water remediation activities performed at the site <br /> I II �� <br /> ' I <br /> • Between 26 September and 12 December 2002 - Continued pump'and-treat' interim' ' fi <br /> ' Hremediation utihzing on-site extraction well EW-1, discharged approximately 278,640 <br /> gallons of extracted and treated ground water into City of Manteca sanitary sewer system <br /> t On 18'6ctober 2002-AGE performed a monthly monitoring event at the ground water pump- . <br /> and-treat remediation system <br />' E • ' 10, 11 and'12 November 2602 'AGE performed a quarterly,ground water monitoring event z <br /> (fourth quarter 2002)'at wells MW-1 through MW-13 and EW-1, monthly momtonng was <br /> performed at the pump-and-treat mfluent,'GAC-2 and effluent <br /> I I <br /> • 'On'12 December 2002 - AGE performed a monthly monitoring event at the ground water <br /> 'pump-and-treat remediation system ' <br />' w I On 02 January 2003 -The pump-and-treat system effluent was re-sampled and analyzed due <br /> to the presence of a low concentration of MTBE, at 9'micrograms per liter{ptg/l), detected ` <br /> t }in the December 2002 effluent sample, MTBE was not detected in the 02 January 2003 <br /> k, I <br /> sample <br /> I I ' <br /> I I I { II j It <br /> !� Advanced GeoEovironmental,Inc 1 a <br /> V <br /> II , hf I , III k <br /> 4 l k I �' I pl I'I Al jl <br /> I I <br /> 11, <br /> 1 ILL <br />