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�a a dfI64SIon Of �1 ENVIRONMENTAL SOLUTIONS iN7 it Eta `8 J11L (= P11 12 4 2 July 21, 1998 Project 20805-142 008 Ms Margaret Lagorio San Joaquin County Public Health Services Environmental Health Division 304 East Weber, Third Floor Stockton, California 95201 Re Letter Report of Off-site Vapor Extraction Well Decommissioning, ARCO Station No 760, 225 South Cherokee Lane, Lodi, California Dear Ms Lagono On behalf of ARCO Products Company, Pinnacle Environmental Solutions (Pinnacle), a division of EMCON, is submitting this vapor extraction' Ywell decommissioning report for the ARCO Station 760 located at 225 South Cherokee Lane, Lodi, California A California licensed drilling contractor performed decommissioning of wells VW-6,- VW-12, and VW-13 under the supervision of Pinnacle and San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) personnel on July 2, 1998 Decommissioning activities were conducted consistent with the provisions of PHS/EHD Permit Numbers 016136, 016137, and 016138, and Pinnacle's May 18, 1998, Monitoring Well Destruction Workplan Well construction i�sprnmarized below. Well `Depth Borehole Well Diameter Screen Interval Slot Size Diameter VW-6 26 ft 8-inch 4-inch Sch 40 PVC 23 to 26 ft 0 10 inch VW-12 44 £t 10-inch 4-inch Sch 40 PVC 19 9 to 44 ft 0 10 inch VW-13 44 2 ft 10-inch 4-inch Sch 40 PVC 2(31 to 44 2 ft 0 10 inch Prior to conducting well decommissioning activities, Pinnacle obtained an encroachment permit for decommissioning VW-6 from the City of Lodi and notified owners of the properties where wells VW-12 and VW-13 werer'located that the wells would be decommissioned under the provisions of the existing access agreements SAC\N\YI010805108051420 SAS-981pzusmer 1 Rev 0,7/21/98 3939 Cambridge Road Suite 220 Cameron Park California 95682 (530)676 6884 (530)676 6885 Fax r