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1704 West Hammer Lane <br /> Page 2 <br /> For your information, PHS/EHD has directed ARCO to complete the definition of the extent of <br /> petroleum hydrocarbon groundwater contamination related to the operation of underground <br /> storage tanks. Based on the most recent groundwater sampling results Fourth Quarter 1996, <br /> the locations of proposed monitoring wells, as described in the "Authorization to Install Three <br /> Monitoring Wells" dated November 28, 1995 and January 31, 1996, submitted on behalf of <br /> ARCO, should provide sufficient information to define the hydrocarbon plume. ARCO has <br /> begun analyzing groundwater samples for methyl tertiary butyl ether (MTBE) which is much <br /> more mobile than petroleum hydrocarbons and up to 2,400 ppb was detected in the sample <br /> collected from vapor extraction well, VW3, which is located in the southern area of the station <br /> property. Additional monitoring wells may be necessary to define the extent of MTBE <br /> contamination. For your information, PHS/EHD has enclosed a site map and a table <br /> summarizing the Fourth Quarter 1996 groundwater sample results. <br /> In order for ARCO to investigate the contamination associated with the underground storage <br /> tanks located at 1612 Hammer Lane, it will be necessary to obtain access to the Parkwoods <br /> Shopping Center. Should ARCO be unable to access your property, Sims-Grupe as the <br /> property owner will assume responsibility for any remaining contamination of Parkwoods <br /> property. PHS/EHD suggests that you work in cooperation with ARCO. <br /> If you have any questions or wish to discuss the site further, please contact Mary Meays at <br /> (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> � <br /> Mary Meays, Senior REHS Margaro, REHS <br /> Site Mitigation Unit Supervisor <br /> MM/1704HAM/MS <br /> enclosures: <br /> EMCON and Harza work plan site maps, ARCO #548 site map, and sample results <br /> cc: Elizabeth Thayer, CVRWQCB <br /> Paul Supple, ARCO <br /> Jay Johnson, EMCON <br /> LOP file <br />