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<br /> BROWN ANU CAL-DWELL
<br /> CONSULTING ENGINEEP,S
<br /> � ,,� - ---
<br /> October 13, 1988
<br /> Mr. Kyle Christie
<br /> AJrRCO Products Company
<br /> 2000 Alameda de las Pulgas ;:{t
<br /> Post Office Box 5811 -
<br /> San Mateo, California 94403
<br /> 017-3173-54/1
<br /> Subject: Second Quarter 1989 Sampling Results ARCO Station 2133,
<br /> 2908 Benjamin Holt Drive, Stockton, California
<br /> Dear Mr. Christie:
<br /> On August 22, 23, and 24, 1989, Brown and Caldwell collected groundwater samples from
<br /> 13 selected monitoring wells at the subject site. The samples represent the second quarterly
<br /> sampling event of 1989 for the site. Wells E-3 and E-6 were not sampled because E-3 was
<br /> dry and E-6 did not recover sufficiently to sample after it was purged for sampling.
<br /> Quarterly Sampling
<br /> Prior to sampling wells PR-1, PR-2, BHD-1, BHD-2, E-2, E-4, E-5, E-7, E-S, E-9, E-10,
<br /> E-1I, and E-12, a diaphragm pump (supplied by Armour Petroleum Services) was used to
<br /> purge approximately three well casing volumes of water ttom each. Each well was then
<br /> sampled with a Teflon bailer equipped with a bottom-emptying valve. The sample was then
<br /> drained directly from the bottom valve into two 40-milliliter glass bottles with l'cllon-lined
<br /> septa.
<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 xylene Tpf{ ?
<br /> (BETX) by U.S. Environmental Protection Agency (EPA) Method 602. Results are
<br /> summarized in Table 1. The complete laboratory reports are enclosed: All groundwater
<br /> produced during the sampling activity was removed from the site by Armour Petroleum
<br /> Services.
<br /> All sampling equipment',was decontaminated before samp.'irg each well. Equipment was
<br /> washed with laboratory-grade detergent and rinscd with to .
<br /> completed using deionized water. p waterA fins[ rinse was
<br /> Constituents in the groundwater samples from wells PR-1, PR-2, and BHD-2 are below
<br /> detection limits. BETX constituents are detectable in the samples from wells BHD-1, E-2,
<br /> E-4, E-5, E-7, E-8, E-9, E-10,E-11,and E-12. In all samples except PR-1,PR-2, and BHD-2,
<br /> the benze:;c concentration exceeds California C)HS MCLS.
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<br /> 72TngTREET SACR"ENTq CALIFORNIA 956147092.19161444.0127
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