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Fust Quarter 1999 Groundwater Mon►tonng Report <br /> 3300 Waterloo Rd,Stockton CaUornia July 15, 1999 <br /> Former Beacon Station 4610 <br /> GROUND-WATER SAMPLING AND ANALYSES <br /> Ground-water samples were collected from all seven wells All samples were analyzed for <br /> concentrations of <br /> • TPH as gasoline and diesel, modified EPA Method 8015, <br /> • BTEX and MTBE by EPA Method 602 <br /> • MTBE,DIPE, ETBE, TAME, Tert-Butanol, Methanol, and Ethanol by EPA Method 8260 <br /> Analytical results from May, 1988 to-date are summarized in the Table The laboratory report and <br /> chain-of-custody form for the current sampling event are attached Benzene was not detected in <br /> ground-water samples collected from MWA, thru MW-7 MTBE was detected in groundwater <br /> samples collected from monitoring wells MW-4, MW-5, and MW-6 at 1 1, 1 6, and 2 2 micrograms <br /> per liter respectively TPHd was detected in the groundwater sample collected from MW-1 at 64 <br /> micrograms per liter <br /> A copy of this monitoring report should be forwarded to the following party <br /> San Joaquin County Environmental Health Department <br /> Attn Harlin Knoll <br /> 304 E Webber St <br /> Stockton, CA 95201 <br /> The interpretations and/or conclusions that may be contained within this report represent our <br /> Professional opinions These opinions are based on currently available information Other than this, <br /> no warranty 1s implied or intended This report has been prepared solely for the use of Ultramar Inc <br /> Any reliance on this report by third parties shall be at such parties' sole risk This report was prepared <br /> under the review and supervision of the professional geologist, registered with the State of California, <br /> whose signature appears below <br /> If you have any questions or comments, please contact us at (9I 6) 782-9054 <br /> Sincerely, <br /> DOULOS ENVIRONMENTAL COMPANY <br /> 2� 4 <br /> Hal Hansen, Geologist, R G #6697 <br /> • HAL E. 14AIVSEN <br /> >k <br /> Attachments Na 6897(P, <br /> 2 0F CA�-,F <br />