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FARR ASSOCIATES 24 Wells in Site Vicinity Figure 6 shows the locations of water supply wells within approximately 2000 feet of the former Union Ice facility A list of these wells, with their addresses and distances from the Site, is included as Table 2 These wells were identified by review of files at the State Department of Water Resources (DWR) and the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) 3.0 SITE OPERATIONS AND INVESTIGATIONS 3 1 Former Site Operations The Union Ice Company (Union Ice) owned and operated an ice manufacturing plant on the site for over 100 years In 1989, Arctic Ice purchased the facility from Union Ice During the 100 year operational period, Union Ice utilized petroleum products to fuel ice delivery vehicles There may have been some fuel oil used to power refrigeration during the early equipment roperations, although no records exists to confirm this Four single-wall steel underground storage tanks, designate T ks #1 through# 4, were located on the site (Figure 7) 4 anks#1 and #2, located in the northwest orner of the Site, were 10,000- gallon fuel tanks that reportedly contained gasoline Tank was a 500-gallon tank, which contained both gasoline and fuel oil or d,.est i prior to its reported decommissioning in the late 1940s (WHF, 1991) Tank 44 was a 250-gallon waste oil tank for used motor and compressor oils (WHF, 1990) 32 Contaminants of Potential Concern Based on the reported use of the four underground storage tanks at the Site, the following could be considered as potential contarntriants of concern benzene, toluene, ethylbenzene, and total xylenes (BTEX), and total petroleum hydrocarbons as gasoline, diesel and motor oil (TPH-g, TPH-d. TPH-k, TPH-o), organic lead and certain volatile organic compounds (VOCs) that are sometimes found in association with waste oil tanks No fuel oxygenates have ever been reported to have been stored in the tanks on Site, and the recent groundwater quality data (Section 3 4 4) show that fuel oxygenates have not impacted groundwater quality at the Site 3 3 Summary of Site Investigations Site investigation activities were initiated when the four underground storage tanks were removed in 1989, and soil contamination was observed beneath Tanks 3 and 4 Investigation activities have included drilling and soil sampling from soil borings, construction of groundwater monitoring wells, soil gas sampling, and monitoring of on-site groundwater monitoring wells The results of these numerous investigations aie summari-red below and have been documented in reports, as listed in Section 10 of this report In addition, Farr Associates conducted a final • groundwater monitoring event at t.-,e Site in September 1998. as described in Section 3 3 4 below L IM Fdes\Annclw wm1 rn ects%unionNClosurcR t ! 2