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PUBLIC H?ALTH SERVI(ItS <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION ,. <br /> Karen Furst, M.D., M.P.H., Health Officer .._ P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> PAUL SUPPLE <br /> ARCO PRODUCTS COMPANY <br /> P 0 BOX 6549 <br /> MORAGA CA 94570 <br /> RE: ARCO# 6100 <br /> 25775 Patterson Pass <br /> Tracy,CA <br /> WORKPLAN: Wor splan for an Additional Subsurface Investigation DATED: 5/22/01 <br /> PREPARED BY: Delta Environmental Consultants,Inc. <br /> APPROVED X Discussed with Central Valley Regional Water Quality Control Board <br /> DISAPPROVED ❑ <br /> ADDENDUM ❑ Submit by: <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN(1-1&S 25299.37,subd.(c)(3).): <br /> 1. Advancement of four on site borings to depths of 120 to 140 feet below ground surface(bgs)with <br /> continuous soil sampling using mud rotary drilling and conductance of wireline geophysical logging within <br /> the four borings. <br /> 2. Laboratory analysis of soil and water samples for total petroleum hydrocarbons,BTEX,methanol,MTBE <br /> ETBE,TAME,TBA,DIPE, 1,2 DCA,ethanol and EDB. <br /> 3. Installation of four on site monitoring wells using air-rotary drilling. <br /> 4. Advancement of two on site borings to a depth of 100 feet bgs using hollow stem auger drilling. <br /> 5. Develop,sample,and survey the new wells. <br /> COMMENTS AND CONDITIONS: <br /> 1. Completion of the off site borings and installation of the off site wells should be contingent on the <br /> information from the on site work Please continue efforts to secure the off site access agreement. <br /> Information from the on site work may provide further evidence that the off site work is required. <br /> 2. Obtain well permit(s)from EHD and notify EHD at least 48 hours prior to the proposed scheduled work <br /> dates. <br /> REASONS FORDISAPPROVAL OF THE WORKPLAN(II&S 25299.37,subd.(Q(3).): <br /> DATED <br /> c: CVRWQCB—Marty Hartzell <br /> Delta Environmental Consultants <br /> A Division of San Joaquin County Health Care Services <br />