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3 <br /> \ ti- <br /> ENVIRONMENTAL HEALTIrDEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> w < Donna K.Heran,R.E.H.S. Unit Supervisors <br /> Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> P Pro ram Mana er Douglas W.Wilson,R.E.H.S. <br /> g g Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> q�/PORN Laurie A.Cotulla,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,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. (Cambria) on your <br /> behalf. <br /> EHD comments on Work Plan for Additional Site Assessment as follows: <br /> Cambria 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, 13-18, 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 />