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ENVIRONMENTAL HEALT14DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. 304 East Weber Avenue Third Floor Carl Borgman,R.E.H.S. <br /> Director ' <br /> Ai Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,Wilson, <br /> S., H.S. <br /> Douglas W.Wilson,R.E.ii.S. <br /> Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Lf�oe� Laurie A.Cotulla,R.E.H.S. <br /> Fax: (209) 464-07 38 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 /> NVORKPLAN: Work Plan Addendum for Air Sparng Well Installation <br /> DATED:April 6,2004 <br /> PREPARED BY: URS Co orae n <br /> APPROVED X <br /> DISAPPROVED ❑ <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN [Health &Safety Code <br /> (H&S) Section 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(ITH-g) by United States Environmental <br /> Protection Agency(EPA) SW-846 Method 8015B; <br /> + Benzene, toluene,ethyl benzene,and total xylenes (BTEX),methyl tertiary-butyl ether <br /> (MTBE),tertiary butyl alcohol(TBA),di-isopropyl ether^(DIPE),ethyl tertiary-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 ��. �4 _ BY <br /> ' a <br /> CC; CVRWQCB—James L.L. Barton <br /> URS Corporation—Jeff Brooks <br />