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- - - '"k,. � �„ ` �� "F1 '>':�� .:��,.� r W; ,�i •«P rw _��t a- <br /> v1 <br /> K <br /> k <br /> 3 <br /> � r <br /> t_ �� TECHNOLOGY, INC.' 1401 Hah.ud Qrise,Suite 140,West Sacramento,CA 9569;.1"]E1372-3700 <br /> _._. —�— rM916.i372.8781 <br /> December 11, 1991 Project No.02320 1940 <br /> Mr.R. R.Zielinski <br /> Texaco Environmental Services <br /> a 4 <br /> 108 Cutting Boulevard + <br /> Richmond, CA 94804w'ti..;�,a��: <br /> C E C 2 7 1991 <br /> RE: QUARTERLY STATUS REPORT(R-5 of 9.) F.yVIRO�I1�ENTA4.H ALTH <br /> TEXACO SERVICE STATION PERMIT/SERVICE <br /> 440 WEST CHARTER WAY <br /> STOCKTON,CALIFORNIA <br /> Dear Mr. Zielinski: <br /> This letter is presented as a quarterly report on groundwater conditions at the site referenced above <br /> for the quarter of September through November 1991, Groundwater mf, ;taring and sampling were <br /> conducted to determine water table elevation, the thickness of any zeparate-phase petrolsum <br /> hydrocarbons (SP), and the distribution of dissolved hydrocarbons in the 11 monitoring wells (MWS) <br /> at this site. Groundwater monitoring data and results of laboratory analyses of groundwater samples <br />' collected on November 6, 1991, are included. <br /> WORK PERFORMED <br /> GROUNDWATER MONITORING <br /> On November 6, 1991, water table elevations at the site were an average of 0.84 foot lower than <br /> levels reported the previous quarter. The estimated flow direction of the groundwater is divergent from <br /> MW-2 to the northeast. Figure 'i (Attachment A) is a potentiometric surface map constructed from <br /> the November 8, 1991 monitoring Data. Table 1 (Attachment B) presents a cumulative summary or <br /> the most recent and four preceding quarterly monitoring events. <br /> GROUNDWATER SAMPLING <br /> Prior to water-sampie collection, the groundwater monitoring wells were purged of 4-10 casing <br /> volumas and allowed to recharge with representative formation watt r. A U.S. Environmental <br /> Protection Agency (EPA)-approved Teflon'sampler,cleaned with an Industrial detergent and distilled <br /> water, was used for the groundwater sampling. The water samples were than transferred to 40- <br /> milliliter plass vials with Teflon'-septum caps,preserved on ire,and transported to GTEL Environmental <br /> Laboratories, Inc. (GTEL), in Concord, California,accompanied by a chain-af-custody manifest. <br /> !)!!trey 1hm+ughaud f.4e U. Canada and Oroseas <br />