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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> _ Donna K Heran,R E H S Bo <br /> 304 East Weber Avenue, Third Floor Carl <br /> Supervisors <br /> Huggins, <br /> ,R E H S <br /> R <br /> Director Mike Huggins,R E H S,R D I <br /> Al Olsen,R E N S Stockton, California 95202-2708 Douglas W Wilson,R E H S <br /> oq=�r�oRa�P Program Manager Telephone (209) 468-3420 Margaret Lagono,R E H S <br /> Laurie A Cotulla,R E H S Fax (209) 464-0138 Robert McClellon,R E H S <br /> Program Manager Mark Barcellos,R E H S <br /> PAUL SUPPLE <br /> ATLANTIC RICHFIELD COMPANY <br /> P O BOX 6549 <br /> MORAGA CA 94570 <br /> RE ARCO Service Station No .2186 <br /> 3212 North California Street <br /> Stockton,California 94570 <br /> WORKPLAN Work Plan Addendum for Air S12arMg Well Installation <br /> DATED Al2n16.2004 <br /> PREPARED BY URS Corporation <br /> APPROVED X <br /> DISAPPROVED ❑ <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN [Health& Safety Code <br /> (H&S) Secuon 25299 37(c)(3)] <br /> 1 Installation of one air-sparging well,AW-1,to a depth of 65 feet below ground surface(bgs) for <br /> the purpose of conducting an insitu air-sparging pilot test The screen interval will be set at <br /> approximately 60 to 65 feet bgs Soil samples will be collected at 5-foot intervals for lithological <br /> description and at least one soil sample will be submitted for chemical analysis <br /> 2 Selected soil samples will be analyzed for <br /> • Total petroleum hydrocarbons as gasoline (TPH-g) by United States Environmental <br /> Protection Agency(EPA) SSV-846 Method 8015% <br /> • Benzene,toluene, ethyl benzene,and total xylenes (BTEX),methyl tertiary-butyl ether <br /> (MTBE),tertiary butyl alcohol(TBA),di-isopropyl ether(DIPE),ethyl ternary-butyl ether <br /> (ETBE),tertiary amyl methyl ether(TAME),ethylene dibromide (EDB), <br /> 1,2-dichloroethane (1,2-DCA),methanol,and ethanol by EPA SW-846 Method 8260B <br /> COMMENTS AND CONDITIONS <br /> 1 URS Corporation will produce a pilot test work plan with site hydrocarbon mass calculations <br /> following installation of the air-sparging well <br /> DATED &j:tZj.201 "& BY d <br /> cc CVRWQCB—James L L Barton <br /> URS Corporation—Jeff Brooks <br />