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1 <br /> `s BROWN AND <br /> C A L D W E L L <br /> May 31, 1996 <br /> Mr. Brian Cobb <br /> E-Z Serve Petroleum Marketing Company of Cahfonna <br /> 2550 N Loop West, Suite 600 <br /> Houston, Texas 77292-2021 11-3003-03 <br /> Subject- First Quarter 1996 Groundwater Monitoring Report <br /> Former E-Z Serve Station #100878 <br /> 1012 West Yosemite Avenue, Manteca, California <br /> Dear Mr Cobb: <br /> This letter report summarizes the first quarter groundwater monitoring activities conducted by <br /> Brown and Caldwell at 1012 West Yosemite Avenue, Manteca, California (Site), on <br /> February 22, 1996. The work performed at the Site included collecting depth-to-water <br /> measurements, purging and sampling eight wells, and submitting the groundwater samples to an <br /> analytical laboratory for analysis. Field work was performed following the procedures outlined <br /> in Attachment A. <br /> Field and Analytical Methods <br /> Initially, depth-to-water and free product measurements were collected from the eight wells by <br /> a Brown and Caldwell field technician using an ail-water interface probe. The wells were then <br /> purged of a minimum of three well volumes, or until evacuated, using a centrifugal pump. After <br /> purging, each monitoring well was sampled by the Brown and Caldwell field technician using <br /> a disposable bailer. Samples were then transferred to appropriate laboratory-supplied containers, <br /> placed in a cooler containing crushed ice, and submitted under appropriate chain of custody to <br /> CKY Incorporated (CKY) for analysis of total petroleum hydrocarbons as gasoline (TPHg) and <br /> benzene, toluene, ethylbenzene, and total xylenes (BTEX) following EPA Methods 8015 <br /> Modified and 8020, respectively. CKY is located m Torrance, California and is certified by the <br /> State of California Department of Health Services for analysis of hazardous materials <br /> Groundwater sample collection records and chain-of-custody documentation for this quarterly <br /> sampling event are included in Attachment A. <br /> I ' <br /> ' Eumis6s+n'rnyunioomis`r-imwPs <br /> { I II I Erv7rOnrnentEtiEng,neernnbRnd,Coosulhng Anal icatserv,ces I c 4 <br /> t <br /> P 0 Bu) 804 W%L\LT CRUS CA 94)96 7220 <br /> 3480 BLskIRk A4F\L L PLLas�\T HILL CA 94523-9342 � 1 <br /> 1 <br /> {�10i 937 9010 Fir { 101 9137 9026 ' <br /> ',I i <br /> l 1 €i I I l <br /> 1 E Ili lig II' I �'tll �'l l ti { 'l l� i° If I'!`I� ,I Ali 'lig �{ I <br /> 'I y� _ I i 1 I•. <br />