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1 ' 20 January 2005 . AGE-NC Project No 97-0343 ' Page 2 of 21 ' (Basin 5-22) This basin is drained primarily by the San Joaquin River The nearest surface water feature in the vicinity of the property is the Stockton Diverting Canal located approximately 300 feet north of the site The Stockton Diverting Canal usually contains little water and has not appeared to ' have a significant effect upon ground water depth or flow direction in the area, however the canal could be the cause of the significant fluctuation in ground water flow direction and depth at the site Ground water in the area of the site is considered to be of beneficial use 1 2 2 GROUND WATER DEPTH AND FLOW DIRECTION ' Based on ground water monitoring events recorded at the site between February2000 and September 2004,depth to ground water measurements have fluctuated between a high of 33 feet below the top ' of the well casings (bloc) and 62 feet btoc The inferred ground water flow direction generally has been towards the northwest (nine times) at gradients ranging between 0 001 ft/ft and 0 008 ft/ft, ' ground water flow was towards the south four times at gradients between 0 01 ft/ft and 0 05 ft/ft,and twice towards the east or northeast at gradients between 0 001 ft/ft and 0 04 ft/ft Depth to ground water and ground water elevation data are summarized in Table 1 M 23 RECEPTOR SURVEY rAGE conducted a well survey during First Quarter 2000 to identify municipal,domestic,industrial, irrigation and monitoring wells located within a 2,000-foot radius of the site (Table 2) The survey did not identify any municipal wells within the 2000-foot search radius, the nearest municipal well was located approximately 3,600 feet northwest of the site(Figure 3) Eleven domestic/agricultural wells were identified within 2000 feet of the subject site,the nearest well was located approximately 900 feet west of the site, and the nearest domestic well down-gradient from the site was approximately 1,250 feet south of the site Six sites with ground water monitoring wells were identified within 2000 feet of the site One site is the former Canteen Corporation site at 1500 Shaw Road 2 4 UNDERGROUND STORAGE TANK REMOVAL Two 550-gallon USTs were removed from the site on 03 October 1986 by Stockton Service Station Equipment Company According to correspondence from the EHD,both USTs were reportedly used I to store gasoline Upon removal of the USTs, one soil sample was collected from the floor of the excavation The sample was analyzed by California Water Labs, Inc , a state-certified analytical . laboratory, for total petroleum hydrocarbons quantified as diesel (TPH-d), benzene, toluene and Advanced CeoEnvironmental,Inc