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1 <br /> r <br /> URS <br /> �3 AM g:58 <br /> July 12, 2005 2405 SUL ��Efri�Y <br /> NYIvkok f�?'R�M� <br /> ANT <br /> Mr Harlan Knoll 11194 <br /> San Joaquin County 06 a3 <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95201 <br /> RE: Workplan for Additional Assessment <br /> Former BP Retail Site No. 11194 <br /> 2375 N. Tracy Boulevard <br /> Tracy, California <br /> Dear Mr Knoll <br /> URS Corporation Americas (URS), on behalf of Atlantic Richfield Company (ARCO - a BP <br /> affiliated company) has prepared this workplan to conduct an additional assessment at former BP <br /> Retai l Site No 11194 located at 2375 N Tracy Boulevard in Tracy,California(site) This workplan <br />'�A* has been prepared to investigate the lateral and vertical extent of groundwater contamination as <br /> requested in the San Joaquin County Environmental Health Department(SJCEHD)letter dated May <br /> 27, 2005 (Appendix A) <br /> • One deep monitoring well (MW-9) will be installed on-site in the downgradient <br /> groundwater flow direction to assess vertical extent and monitor hydrocarbon impacts in <br /> deep groundwater <br /> • One dual completion monitoring well (MW-10S/MW-10D) will be installed off-site <br /> downgradient of MW-7 to assess lateral and vertical extent and monitor MtBE impacts <br /> in groundwater <br /> BACKGROUND <br /> The site is located at the northwest corner of the intersection of N Tracy Boulevard and Grant Line <br /> Road in Tracy,California(Figure 1) The site formerly operated as a Mobile retail gasoline station <br /> Currently, the site is operating as a Seventy-Six (76) retail gasoline station <br /> In August 1986, four gasoline USTs were removed and replaced Site investigations have been <br /> ongoing since 1986 A total of 14 groundwater monitoring wells (MW-1 through MW-8, and <br /> AMW-1 through AMW-6) have been installed at the site Well locations are shown in Figure 1 <br /> URS Corporation ' <br /> Crown Corporate Center <br /> 2810 Gateway Oaks Drive Suite 300 <br /> Sacramento CA 95833 <br /> Tel 916 679 2000 K 1Wprocess05 BP ARCOU 1 194\2005 Well lnstall111194 Well Install WP 05 doc <br /> Fax 916 679 2900 <br />