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i <br /> 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 /> Additional monitoring wells may be necessary to define the <br /> property. 9 Y rY 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 /> Mary Meays , Senior REHS Margare`t'Lagorio , 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 /> ay Johnson , EMCON <br /> LOP file <br />