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1386 EAST BEAMER STREET <br /> ESTERN WOODLAND. CA 95695-9603 <br /> GFO ENGLNEERS FAX(916)662-0273 <br /> CALIF CON'1'RACTOtZ#513857 A CORPORATION <br /> (916) 668-5300 <br /> REGISTERED GEOLOGISTS <br /> APRIL 9, !491 <br /> MR. LARRY WILLIAMS <br /> ENV. CONTROL OFFICER II <br /> MUNICIPAL UTILITIES DEPT. <br /> 2500 NAVY DRIVE I <br /> STOCKTON, CA. 95206 <br /> (209) 9448722 <br /> FAX (209) 944-8708 <br /> RE: one time dump of ground water produced from installation and <br /> monitoring of wells located at 1448 E1 Dorado Street, Stockton, <br /> Califoria. <br /> Dear Mr. Williams: <br /> As to my conversation today with Frank in your department, I am <br /> enclosing the chemical results of the approximate 800 gallons of <br /> water being stored on site in 17 17H-55 gallon drums. The <br /> laboratory results are of a composite sample taken of these . drums <br /> on April 2, 1991 and is below the detection limits for. EPA methods <br /> 5030, TFH and 602, BTEX. We will use the clean out drain at the <br /> site to dispose of this Water after we have recieved permission <br /> from your department. <br /> _ SAMPLING PROCEEDURES <br /> On April 2, 1991, Western Geo-Engineers environmental engineer, <br /> Mr. Chuck Holder, was on site to sign over the manifest to have 4 <br /> activated charcoal drums transported to Cameron Yakima for re- <br /> juvination. During this visit, Mr. Holder obtained a composite <br /> sample of the 17 drums containing the.purged ground water from the <br /> on site monitoring wells. The composite sample was obtained by <br /> removing approximately 40 cc ofwater from each drum using a j <br /> steril disposable PVC bailer and placing this water into a clean 5 <br /> gallon plastic bucket for compositing. From the approximately 680 <br /> cc of water now stored in the plastic bucket, 160 cc was removed <br /> using the disposable bailer used in the initial compositing and <br /> - placed into 4 40cc VOA's with no headspace, capped with teflon- <br /> -septa-caps,--- <br /> eflon- <br /> -septa-caps,--labeled,. placed-in-_a_zip-lock_baggie_andrthen_cooled__ T_ <br /> to 40F by storage on ice in a cooler. The' sample was .designated <br /> "stored purged water" and chain of custody hand delivered , to <br /> Chemtech Laboratories (DHS#359) for analysis using EPA methods <br /> 5030/602 for Total Fuel Hydrocarbons with BTEX. The remaining <br /> water that was composited in .the plastic bucket was then . returned <br /> page <br />