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oJi�- LUU4 1.J JL Lg74b6s4,33 <br /> r D- I H F Luuk PAGE 01 <br /> f <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN" JOAQUIN COUNTY <br /> (� 1 WI Donna 9.Hera.",RE]ECS UnrtSuperv�sars <br /> Director 304 East Weber Avenue, Third Floor Cart Sorgmsn,RE H 5 <br /> Al Olsen,R E R 5 Stockton,California 95202-2708 Mike Huggins,R11 H S,RD I <br /> r� ` P Program Manager Douglas W Wilson,kr H S <br /> c,�ogN Ukurie A.Cotulla,R E HS Telephone (209)468-3420 Margaret Lagono,8.1;14 S <br /> Program Manager Fax (209)464-0138 Robert McClellon,M 14 S <br /> Mark Baroeilos,Ct E 14 S <br /> 8D RALSTON <br /> CONOCOPHILLTPS <br /> 76 BROADWAY <br /> SACRAMENTO CA, 95812 <br /> RE' Tosco (former Unocal) Service Station #4409 Site Code, 508431 <br /> 1502 N. El Dorado St RO#0000084 <br /> Stockton, CA., 95204 <br /> WQK PLAN "Addendum to Work Plan for Vertical Assessment" <br /> DATEDi March 18, 2004 <br /> PREPARED BY-, Secor International Inc-w Gavan Heinrich, R.G. <br /> STATUS. APPROVED <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN rHgS <br /> 25299 37 subd c 3 <br /> • Install two onsite, deep, Sonic borings (dual hole)to 120' bgs for <br /> continued vertical assessment and future monitoring well <br /> installation (separate work plan) and, <br /> • Collect soil samples starting at 80' bgs and continuing to 120' bgs <br /> at 10-foot Intervals and analyze soil and grab ground water <br /> samples for TPHg, BTEX, five fuel oxygenates, EDB, ethanol, and <br /> 1,2-DCA by EPA Method 8260, single run and, <br /> • Submit a report of findings to END in the format of an updated <br /> Site Conceptual Model (SCM), <br /> COMMENTS AND CONDITIONS <br /> • This addendum is the result of previous conversations between <br /> EHD, Secor, and ConocoPhillips and addresses EHD concerns <br /> noted after a review of the original work plan dated February 27, <br /> 2004. <br /> REASONS FOR DISAPPRQVAL OF THE WORK PLAN fH&5 25299.37, <br /> subd(c)(3)1 <br /> • None <br /> BY <br /> Michael 1&n5# 5649 209 468-3454 <br /> Faxed to consultant �X] 3rZ5-t3 <br />