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IA <br /> a GROUNDWATERE][:]E] <br /> SAL N� <br /> TECHNOLOGY, INC. `�v`' ` ��= <br /> l OIL RECOVERY SYSTEMS 1832 Tribute Road,Suite G,Sacramento,Callb(916)921-1800 <br /> February 17 , 1988 l <br /> Project Number 202/799-5027 <br /> Mr . Ted Knowles <br /> 1140 West Hammer Lane <br /> Stockton, CA 95209 <br /> RE: SAMPLING RESULTS <br /> KNOWLES GAS STATION <br /> 1140 WEST HAMMER LANE <br /> STOCKTON, CALIFORNIA <br /> Dear Mr . Knowles : <br /> This letter presents Groundwater Technology, Inc . ' s ( GTI ' s ) <br /> findings from an additional round of sampling conducted at the <br /> Knowles Gas Station, 1140 West Hammer Lane , Stockton, California. <br /> In addition to the sampling results are GTI ' s recommendations for <br /> additional work. GTI initiated work at the above referenced site <br /> following written authorization by Mr . Ted Knowles on February 1 , <br /> 1988 . The work steps consisted of purging and sampling the three <br /> existing monitoring we:'.ls and the submission of each sample for <br /> laboratory analysis . <br /> The three existing monitoring wells were purged and sampled on <br /> February 2 , 1988 ( See Figure 1 , Site Plan) . Each well was purged <br /> by hand bailing approximately 3 to 4 well volumes of water using <br /> a clean acrylic bailer . Each well was subsequently sampled with <br /> an EPA approved TeflonTM sampler used to transfer groundwater <br /> into 40 milliliter (ml ) Teflon TM capped vials . The sampler was <br /> cleaned with laboratory grade detergent and rinsed with distilled <br /> water before and after collection of each water sample. The <br /> samples were labeled , placed on ice and transported to <br /> Groundwater Technology Environmental Laboratory in Concord , <br /> California, accompanied by a Chain-of-Custody manifest . Water <br /> samples from all three wells were submitted for modified EPA <br /> Method 602 analysis ( includes xylene quantification) . <br /> A review of the laboratory analyses indicated benzene <br /> concentrations to be 3- art per billion ( ppb) , 2 ppb and wpb <br /> in monitoring wells 1 , ' 2 , and 3 , respectively ( see Attachment I , <br /> Laboratory Analyses ) . These values are substantially lower <br /> O(ices throughout the U.S., Canada and Overseas <br /> Western offices in: Tempe, AZ; Concord, CA; Sacramento, CA; San Diego, CA; <br /> Torrance, CA; Ventura, CA; Englewood, CO ; Renton, WA <br />