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D06LOS
<br /> Environmental, Inc
<br /> r
<br /> Telephone (916) 990-033
<br /> P O Box 259 Oran ovale. CA 95 2,
<br /> 662 / FAX 916) 990-0332
<br /> August 22, 2002
<br /> Joseph Aldridge
<br /> Ultramar, Inc
<br /> 685 W Third Street
<br /> Hanford, CA 93230
<br /> Subject Supplement Letter for Request For Site Closure Report
<br /> Former Beacon Station #610, 3300 Waterloo Road, Stockton, CA
<br /> Dear Mr Aldridge
<br /> Doulos Environmental, Inc (Doulos), has been authorized by Ultramar, Inc (Ultramar)
<br /> to produce a supplemental closure document for the site located at 3300 Waterloo
<br /> Road, Stockton, California (Figures 1 and 2) In a phone conversation between Harlin
<br /> Knk&Land yourself, a list of other information was needed prior to evaluating the site for
<br /> closure This included hydrocarbon mass balance calculations, an updated well survey,
<br /> and all historical data to be tabulated This letter is intended to supplement the Acton
<br /> Mickelson van Dam's (AMVs) January 24, 1995 Request for Site Closure Report
<br /> (Appendix A)
<br /> SITE HISTORY UPDATE FROM 1995 TO PRESENT
<br /> Since 1995 the environmental work has been limited to two ground water monitoring
<br /> events dated March 25, 1999 and September 1, 1999 Groundwater samples were
<br /> analyzed for BTEX, TPHg and TPkd, methyl-t-butyl ether (MTBE), diisopropyl ether
<br /> (DIPS), ethyl-t-butyl ether (ETBE), Tert-amyl methyl ether (TAME), tert-butanol (TBA),
<br /> methanol, ethanol, 1,2-dichloroethane (1,2-DCA), and 1,2-dibromoethane (1,2-EDB)
<br /> Cumulative ground water analytical results are summarized in Table 1
<br /> During the March 25, 1999 sampling event, of the above referenced constituents, only
<br /> MTBE was detected in monitoring wells MW-4, MW-5 and MW-6 at concentrations of
<br /> 1 1, 1 6, and 2 2 ppb, respectively The September 1, 1999 Analytical results from
<br /> monitoring wells MW-1 through MW-7 indicated MTBE, DIPS, ETBE, TAME, TBA,
<br /> methanol, ethanol, 1,2-DCA, and 1,2-EDB were not detected in any of the wells
<br /> sampled Only one well, MW-5, had measurable amounts of petroleum hydrocarbon
<br /> constituents at 66 ppb of TPHd
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