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ENVIROI'�MENTAL HEALTH DEPARTMENT <br /> PauiN <br /> °= c° SAN JOAQUIN COUNTY <br /> Supervisors <br /> Donna K lieran,1t F H S Unit.Su P <br /> Director 301 East Weber Avenue Third Floor Carl Borgman,R E it S <br /> Al Olsen,R E H S Stockton California 95202-2708 Mike Huggins, R E 11 S, R D I <br /> Program Mrrnrrgcr Douglas W Wilson R E H S <br /> �7F0 1,a Laurie Cotolla,R E H 5 Telephone (209) 468-3420 Margaret Lagorro,R E N S <br /> Fax (209) 464-0138 Robert Nl(Clellon,RE H S <br /> f rogratir tifartager Mark $arcellos,R E H S <br /> OLYMPIAN JUL 13 2005 <br /> 2000 ALAMEDA DE LAS PULGAS <br /> SUITE 242 <br /> SAN MATEO CA 94403 <br /> RE Jimco Truck Plaza SITE CODE 1604 <br /> 1022 Frontage Road (Formerly 22502 S Highway 99) <br /> Ripon, California <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Work Plan <br /> for Additional Site Assessment, and Feasibility Testing Work Plan, both dated May 18, <br /> 2005, and prepared by Cambria Environmental Technology, Inc (Cambna) on your <br /> behalf <br /> EHD comments on Work Plan for Additional Site Assessinent as follows <br /> Cambna proposes to install one groundwater monitoring well (MW-10) to a total depth <br /> of 35 feet below ground surface (bgs) with a screen interval between 15 and 35 feet bgs <br /> No specific reason is given for the proposed well location approximately 130 feet west of <br /> monitoring well MW-8 near the southwest corner of the property line EHD approves the <br /> installation of MW-10, however, EHD recommends that the monitoring well be relocated <br /> west of MW-9 and approximately midway between Cambria's proposed location for <br /> MW-10 and MW-3 In April 2005 two monitoring wells were installed in the Frontage <br /> Road for the Ripon Farm Service site These two wells, each screened between 15 and <br /> 35 feet bsg, are located near Cambria's proposed well location for MW-10 and EHD <br /> believes these two wells will provide lateral assessment of impacted groundwater to the <br /> southwest of the former underground storage tank (UST) location Also, since <br /> groundwater flow direction west of the former UST's varies from northwest, west, and <br /> southwest, EHD believes a well installed due west of MW-9 will provide information to <br /> assess the lateral extent of impacted groundwater west of the former USTs EHD also <br /> recommends that the boring be continuously cored to provide a more comprehensive <br /> lithological evaluation instead of collecting soil samples at five-foot intervals <br /> EHD approves the advancement of one soil boring, B-18, to be advanced approximately <br /> 10 feet west of the former USTs for vertical assessment of impacted groundwater In <br /> addition to collecting grab groundwater samples at depths of approximately 30, 45, and <br />