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BROWN AND <br /> C A L D W E L L <br /> May 9, 1997 <br /> Mr Brian Cobb <br /> E-Z Serve Petroleum Marketing Company of California <br /> 2550 N Loop West, Suite 600 <br /> Houston, Texas 77292-2021 41-5172-05 <br /> Subject First Quarter 1997 Groundwater Monitoring Report <br /> Former E-Z°Serve Station#100878 <br /> 1012 W 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 W Yosemite Avenue, Manteca, California (Site), on <br /> I <br /> April 15, 1997 The work performed at the Site included collecting depth,to-water <br /> measurements from eight groundwater monitoring,wells, purging and sampling tire-eight <br /> wells, and submitting the groundwater samples to an analytical laboratory for analysis. Field <br /> work was performed following the procedures outlined in Attachment A <br /> Field and Analytical Methods <br /> Initially, depth-to-water and free product measurements were collected from eight wells by a <br /> Brown and Caldwell field technician using an oil-water interface probe The wells were then <br /> purged of a minimum of three well volumes using a centrifugal pump Aftef,purging, each <br /> well was sampled by the Brown and Caldwell field,technician using a-dxspasable,bailer, <br /> Samples were transferred to appropriate laboratory-supplied containers, placed in I , cooler <br /> containing crushed ice, and submitted under appropriate chain of custody to V O.0 Analytical , <br /> Laboratories, Inc (V O C ) for analysis of total petroleum hydrocarbons as gasoline (TPHg) ' <br /> and benzene, toluene, ethylbenzene, and total xylenes (BTEX) following EPA Methods 8015 <br /> Modified and 8020, respectively V O C is located in Concord, California and,is certified by <br /> the Statc,of California'Department of Health Services for analysis of hazardous materials <br /> Gronndwateisample collection records and chain-of-custody documentation for this quarterly <br /> sampling event are included in Attachment A ; <br /> r <br /> I' <br /> I <br /> 11 Environmental Engineering And Consulting Analytical Services <br /> i I I P 0 8or 804) WAI NUT Ckei k CA 94596 1220 <br /> it I� iE' i I' i34i80 BushIieh'A�rNut IPLEASAINT HIL�[ 'CA 19a)23 4342 <br /> I <br /> !I F\LRE-617Ml72.O5�FRLYRPnIO097MIST 1997 0) 93 1 9 010 F x (�l 01) 9 3 7 9 0 26 l <br />