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i <br /> $EkVICES <br /> PUBLIC:, HEALTH <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue,Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> JIM PARKINSON <br /> PARKINSON'S ARCO <br /> 3250 W HAMMER LN <br /> STOCKTON CA 95209 <br /> RE: Parkinson's ARCO <br /> 3250 W.Hammer Ln. <br /> Stockton,CA <br /> WORKPLAN: Work Plan for 5-Day Dual Phase Extraction Event Installation of Two Down Gradient <br /> Wells.and One Deep Soil Boring DATED: 12/12/01 <br /> PREPARED BY: IT Corporation <br /> APPROVED X <br /> DISAPPROVED ❑ <br /> ADDENDUM ❑ Submit by: <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S 25299.37,subd.(c)(3).): <br /> 1. Installation of 2 groundwater monitoring wells in the access easement road between the ARCO and the <br /> neighboring 76 Station. <br /> 2. Advancement of one,on-site,continuous core soil boring to a total depth of approximately 80 feet below <br /> surface grade for vertical definition of contamination. <br /> 3. Conduct a 5-day,dual phase extraction(DPE) feasibility test using a mobil DPE system. <br /> COMMENTS AND CONDITIONS: <br /> 1. DPE system will run continuous 24 hrs.per day for the 5 days. <br /> '2. In order to achieve the proposed draw down of 10 feet,groundwater may need to be extracted at a higher <br /> rate. Extra storage for extracted groundwater may be needed. <br /> 3. Laboratory analysis of vapor and groundwater samples for total petroleum hydrocarbons,BTEX,and fuel <br /> oxygenating compounds. <br /> 4. Notify PHS/EHD at least 48 hours prior to the proposed scheduled work dates. <br /> DATED 1Z BY <br /> Sam Savig E <br /> LOP/Site Mitigation Unit IV <br /> Cc: CVRWQCB—Marty Hartzell <br /> Mike Sgourakis—IT Corporation <br /> i <br /> A Division of San Joaquin County Health Care Services <br />