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GF x <br /> z.� ;:: <br /> ". sr�."3a '" ,i(1""yk. .+amµ' Il s• `, .. zwmg.,r.n-c <br /> L -mss_ - a" .n-•. , ,p ..x -y 'tt7?� . s �„ ``'^Ors - ,a.. +.eny <br /> '. <br />.sewf •u �, - •• '0-w <br /> 2. <br /> .. I� t�r►ri <br /> BROWN AND CALDWELL <br /> CONSULTING ENGINEERS kr�4f <br /> 44ii�� v� <br /> January 5, 1989 JAN 2 7 X989 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Mr. Kyle Christie <br /> ARCO Products Company <br /> 2000 Alameda de. las Pulgas <br /> San Mateo, Califontia 94403 017-3173-30/I <br /> Subject: Quarterly Sampling Results, ARCO Station 2133, <br /> 2908 Benjamin Holt Drive, Stockton, California <br /> Dear Mr. Christie: <br /> On November 28 and 29, 1988, Brown and Caldwell collected groundwater samples from <br /> ten selected monitoring wells at the subject site. Brown and Caldwell also collected one <br /> water sample (R-1) from the recovery system. <br /> . i <br /> Quarterly Sampling <br /> Prior to sampling wells PR-1, PR-2, BHD-1, E-2, E-5, E-8, E-9, E-10, E-.l, and E-12, a <br /> i - pump (supplied by Armour Petroleum Services) was used to purge approximately three well <br /> casing volumes of water from each. Each well was then sampled with, a Teflon bailer <br /> equipped with a bottom-emptying valve. The sample was then .drained directly from the <br /> bottom valve into two 40-milliliter glass bottles with Teflon-lined septa. Sample R-1 was <br /> collected directly from the discharge valve between the pump and the separator tank. A <br /> I-liter amber glass bottle and two 40-milliliter glass tottles were used to sore Sample R-1. <br /> The samples were stored on ice from the time of collection through delivery to Eureka <br /> Laboratories. All of the samples were analyzed for benzene, ethylbenzene, toluene, :and 1 y <br /> xylene (BETX) by U.S. Environmental Protection Agency (EPA) Method 602. Sample R-i <br /> was aisc analyzed for total petroleum fuel hydrocarbons (TPH) by EPA Method 8015, <br /> modified. Results are summarized in Table 1. The complete laboratory reports are <br /> enclosed. All groundwater produced during well sainpling was removed from the site by <br /> Armour Petroleum Services, <br /> Constituents in the groundwater sample from well PR-2 are below detection limits. 'The <br /> sample from monitoring well PRA has detectable levels of BETX. BETX constituents are <br /> detectable it tite samples from wells BHD-1, E-2, E-5, E-8, E-9, E-10, E-11, and E-12. .In <br /> all saniples, except PR-2, the benzene concentration exceeds Ctali ornla Department of <br /> 1-lealth Services (DMS) Drinking Nater Action Levels. <br /> MSSTR££T SACTWENTO.GµIFORNIA95al4-7M-(9�6i444a123 <br />