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� . 08/01,/2001 10 44 2094683433 FIFTH FLDDR PAGE 62 <br /> PUBLIC HELTH SERVICES 4 �'A1�.F <br /> • SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Frust,M D.,M.PH , Health Officer <br /> 304 East Weber Avenue, Third FIoor -Stockton, CA 95202 <br /> 2091468-34E20 <br /> ED RALSTON <br /> TOSCO MARKETING COMPANY <br /> 1380 LEAD HILL RD STE 120 <br /> ROSEVILLE CA 95662 <br /> RE Tosco (former Unocal) Service Station #4409 Site Code 508431 <br /> 1502 N EI Dorado St RO#:0000664 <br /> Stockton, CA , 95204. <br /> WORK PLAN Groundwater Assessment Work Plan" <br /> DATED July 6. 2001 <br /> PREPARED BY The IT Group — Mark Capps, RG <br /> APPROVED (with changes) [X] <br /> DISAPPROVED <br /> ADDENDUM NEEDED Submit by, n/a <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN fH&S <br /> 25299 37 subd c 3 <br /> • Install three (3) deep monitoring wells with 10' of screen onsite to 80' bgs and <br /> collect and analyze selected soil samples for evaluation of the lower section <br /> (vertical delineation) of the aquifer, <br /> • Analyze selected soil samples for TPHg (8015m), BTEX (8020) and MtBE by <br /> 8260 <br /> • Well-head elevation survey, <br /> • Report of findings <br /> COMMENTS AND CONDITIONS <br /> • Soil samples for MtBE proposed to be analyzed by EPA Method 8020 MtBE <br /> by EPA 8260 only <br /> • Groundwater samples proposed to be collected and analyzed during <br /> monitoring well installation process Groundwater samples to be collected <br /> during quarterly monitoring and sampling events with other seven (7) <br /> monitoring wells, <br /> • DIPS, ETRE, TAME, TBA, 1,2 dichloroethane, EDB, Methanol and Ethanol <br /> not proposed to be analyzed for Selected (groundwater-saturated) soil <br /> samples with highest PID and/or odors and bottom sample to have these <br /> constituents analyzed for by EPA 8260 (MeOH by 8015m) <br /> A Division of Sart]oaquin County Hcalth Care Services <br /> I� DD <br />