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i - U 11 W19 ENVIRONMENTAL HEALTH DEPA "mr °u'" SAN JOAQUIN COUNTY 13Y------------0I/'0-4 � coG Unit Supervisors ��_ 2 Donna K Heran,R E H S 304 East Weber Avenue, Third Floor Carl Bgins,R, R� , s � Director Mike Huggins,R E H S ,R D I Al Olsen,R E H S Stockton, California 95202-270$ Douglas W Wilson,R E H S o a�P Program iWanager Telephone (209) 468-3420 Margaret Lagono,R E H S ac'Fob Laurie A Cotulla,R E H S Robert McClellon,R E H S Program Manager FaX (209) 464-013$ Mark Barcellos,R E H S �^� U MAY 0 8 2003 EDWARD RALSTON HARDEV & AMARJIT KHINDA ETAL TOSCO MARKETING COMPANY 27000 S LEEWARD 13BO LEAD HILL RD STE 120 TRACY CA 95304 ROSEVILLE CA 95661 RE Circle K / TOSCO-Service Station #1205 SITE CODE 507198 16470 Cambridge St RO# 0000138 Lathrop, CA , 95330 San Joaquin County Environmental Health Department (EHD) has reviewed Work Plan for Off-Site Assessment dated April 7, 2003 as submitted by Secor International Inc (Secor) on April 10, 2003 and Results of Additional Site . Assessment dated February 12, 2003 by Secor and has the following comments The work plan proposes the Installation of one groundwater monitoring well offsite and down gradient of the existing monitoring wells Installed November 2002 MtBE was detected In the groundwater sample collected from the most down gradient well, MW-12, on November 21, 2002 at 1,300 µg/l The proposed monitoring well is for the continued Investigation to delineate the extent of MtBE in the groundwater The work plan is approved with additional requirements noted below. In evaluating the work plan and proposed monitoring well offsite location, EHD discovered that Station #1205 has changed ownership. San Joaquin County Assessor records indicate that the new owner noted above had the property transferred and recorded on October 10, 2002 As a result of this change in ownership of the contaminated property, EHD has submitted paperwork to the State Water Resources Control Board (SWRCB) that will list the new landowners as additional responsible parties EHD was not notified of this transfer of ownership and reminds TOSCO that SWRCB requests that responsible parties notify EHD of changes In ownership within 20 days Please review your files and notify EHD of any other changes in ownership to TOSCO-Circle K-Unocal-76 sites in San Joaquin County • Included in the site assessment report for monitoring well installations (MW-10 to MW-15) was a receptor survey for wells within a 2000-foot radius The survey identified three irrigation wells located down gradient of the site The closest Irrigation well should be investigated and times and periods of its operation should be determined