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1 - Aquifer Testing Work Plan • <br /> Former PureGm <br /> Broadway <br /> Facility <br /> Stockton, <br /> North Broadway Avenue - <br /> Stockton,California <br /> Siena-Pacific Project No. 94.055.05 <br /> ' 4.0 PROPOSED AQUIFER TESTING PROGRAM <br /> ' The proposed PureGro Stockton site aquifer testing program will consist of a series of well installations, <br /> ' tests, and analyses. Major elements of the testing program may be adjusted, modified, or even <br /> eliminated as geologic and empirical data is developed. The body of accumulated scientific data will <br /> ' allow Sierra-Pacific to design an efficient remediation system based on accurate hydrogeologic <br /> information. The following program tasks are listed in the order in which they must be considered or <br /> ' completed. <br /> ' 4.1 Site Development and Construction <br /> The extraction well and new observation wells will be constructed west of the former unlined pond at <br /> ' the northwest corner of the facility, on the rear portion of the Giglio property (Figure 3). The Giglio <br /> property must be fenced and gated. Building materials,wood,brush,and debris must be removed from <br /> ' the site. There is enough brush and debris to justify bringing a transfer container to the site. A storm <br /> water drainage ditch follows Report Avenue. Approximately 600 linear feet of 6-foot chain-link fence <br /> ' with overhead spirals of razor-wire will be installed. The fence will be constructed with a 4-foot-wide <br /> gate on the west side of the fenced area, and a 10-foot-wide truck-gate on the east side of the enclosure. <br /> ' Gates will be locked. <br /> With approval from the San Joaquin County Public Works Department, a culvert and a wooden plank <br /> bridge will be constructed on the Report Avenue (east) side of the Giglio property to provide truck <br /> ' access to the drill sites and proposed pilot pump-and-treat system. The bridge planks will be founded <br /> with concrete footings. <br /> ' 4.2 Select Sites and Drill Soil Borines <br /> ' Three new wells will be sited at the Giglio property,one extraction well and two observation wells. The <br /> observation wells may consist of nested multiple wells at each location shown on Figure 7. Existing <br /> ' monitoring wells MW-2 and MW-8 will also be used as observation wells during the aquifer tests. The <br /> two new observation wells can also be utilized in future as monitoring wells for vertical contaminant <br /> ' SIERRA-PACIFIC GROUP 5 <br /> 1 <br />