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ENVIRON'4 MENTAL HEUl <br /> ALTH EPARTMENT j <br /> SAN.JOAQUIN COUNTY <br /> 2i Donna K. Heran, R.E.H.S. Unit Supervisors <br /> Director 304 East Weber Avenue,Third Floor Carl Borgman,R.EH.S. <br /> •':w Al Olsen, R.E.H.S. Stockton,California;95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> ~ 'P • <br /> Program Manager Douglas W.Wilson, R.E.H.S. ' <br /> 8 g Telephone: (209)468-3420 <br /> Laurie A. Cotulla, R.E.H.S. Margaret Lagorio,R.E.H.S. <br /> �ikaa <br /> Program Manager Fax: (209)464-0138 Robert McClellon, R.E.H.S. <br /> Website:www.sjgov.org/ehcl/ Jeff Carruesco, R.E.H.S. <br /> JIM PARKINSON <br /> PARKINSON' S ARCO <br /> 3250 W HAMMER LANE <br /> STOCKTON CA 95209 <br /> RE: Parkinson's ARCO ! <br /> 3250 W Hammer 'Lane <br /> Stockton, CA 95209 <br /> WORKPLAN: Work Plan for Monitoring Well Installation <br /> DATED: September 6, 2005 <br /> PREPARED BY: Shaw Environmental, Inc. <br /> APPROVED X <br /> DISAPPROVED ❑ <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN [Health& Safety <br /> Code (H&S) Section 25296.10(c)(3)]: <br /> 1. Installation of one monitoring well MW-6 located adjacent to cone penetrometer test <br /> boring CPT-3. MW-6 will be screened at approximately 55 and 60 feet below <br /> ground surface (bgs) to assess vertical and lateral extent of contamination. The well <br /> construction will include a conductor casing to approximately 51 feet bgs. <br /> 2. Soil samples will be collected to characterize the lithology and samples collected at <br /> approximately 16, 27, 35,42, 51, 56, and 60 feet bgs will be analyzed for total <br /> petroleum hydrocarbons as gasoline (TPH-g);benzene, toluene, ethyl benzene, total <br /> xylenes (BTEX); 1,2-dichloroethane (1,2-DCA),.1,2-dibromoethane (EDB),methyl <br /> tertiary-butyl ether (MTBE), diisopropyl ether (RIPE), tertiary-amyl methyl ether <br /> (TAME), ethyl tertiary-butyl ether (ETBE), and tertiary-butyl alcohol (TBA). <br /> 3. Groundwater samples will be analyzed..for',TPH-g, BTEX, 1;2-DCA, EDB, MTBE, <br /> DIPS, TAME, ETBE, and TBA. <br /> 4 <br />