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Atlantic Richfield Company 3 ARCO 595 6100 North Highway 99 Stockton,California September 13 2002 . Rancho Motel, Weinerschnitzel, Auto Factory, and Denny Boy Restaurant) and one residential property (8100 North Highway 99) The returned survey form from Weinerschnitzel indicated the presence of a domestic well (well 6/DW-1), which supplies the restaurant The well was constructed of 6-inch steel casing, however, the total depth of the well could not be verified, though the manager of Weinerschnitzel estimated its depth to be approximately 170 feet In addition to dispersing survey forms, SECOR conducted a physical search of the area During the site visit, a domestic well (well 7/DW-2) was identified on the northern portion of the Auto Factory property, and a well (well 8/DW-3) was found in a fenced compound west of the Auto Factory property Conversations with a Denny Boy Restaurant employee revealed that the well on the Auto Factory property (well 7/DW-2) served both the Auto Factory and the Denny Boy Restaurant Well 8/DW-3 was located in an unmarked fenced compound Details of its well construction are known, however, the well is most likely an irrigation well As indicated in SJCEHD letter dated October 26, 2000, no public water is distributed along the Highway 99 East Frontage Road (SECOR's Site Assessment Report, dated December 11, 2001) In March 2002, four 1,000-pound granular activated carbon (GAC) vessels were installed near the wellhead of DW-1 to treat the groundwater supply to the nearby Weinerschnitzel business A groundwater extraction (GWE) system was activated on April 8, 2002 Extracted groundwater from DW-1 is routed through two cartridge filters, two GAC vessels plumbed in series, and a particulate filter The treated groundwater is routed to the Weinerschnitzel main water supply line at a maximum capacity of 30 gallons per minute (gpm) The GWE system is checked on a weekly basis, and water samples are collected monthly at the influent, midpoint, and effluent sampling ports within the GWE system As of June 2002, approximately 19,000 gallons of water have been treated ASSESSMENT ACTIVITIES AND FINDINGS Prior to beginning site assessment activities, SECOR obtained well permits from the SJCEHD, and encroachment permits for the installation of three off-site wells in the city's right-of-way (DMW-3, MW-8, and MW-10) from the CSJDPW SECOR also obtained written authorization from the property owner to access the nearby Weinerschnitzel property for the installation of well MW-9 (Figure 2) Well construction permits are included in Attachment B Two deep on-site groundwater monitoring wells (DMW-1 and DMW-2), one deep off- site groundwater monitoring well (DMW-3), and three shallow off-site groundwater monitoring wells (MW-8 through MW-10) were installed by Cascade Drilling, Inc (Cascade) of Rancho Cordova, California under SECOR supervision between June 24 and 27, 2002 Deep wells DMW-1, DMW-2, and DMW-3 were installed at depths of . 1015 feet, 102 feet, and 102 5 feet below ground surface (bgs), respectively Deep wells DMW-1 through DMW-3 were completed with 5-foot screens extending from 95 feet to 100 feet bgs, 96 feet to 101 feet bgs, and 97 feet to 102 feet bgs, respectively Shallow I%ARC0105951Reports1well install3 doc