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TRACY WWTP—TOS MONITORING WELL INSTALLATION REPORT <br /> TABLE 2 <br /> Monitoring Well Construction Detailsa <br /> City of Tracy WWTP TSD Monitoring Well Installation Report <br /> Date Borehole Screened Sand Pack Bentonite SurfaceSeal <br /> Well ID Installed Depth Intervalb Intervalb Intervalb intervalb'` Comments <br /> WWTP-MW1 10/10/1990 25.5 5 to 25 3.5 to 25.5 d 0 to 3.5 Upgradient of the holding ponds but is not considered by the <br /> CVRWQCB to be'background'because of its proximity to <br /> the holding ponds. Is not routinely sampled. <br /> WWfP-MW2 10/12/1990 28 7.5 to 27.5 6 to 30.5 d 0 to 6 Downgradient of Pond 4. <br /> WWfP-MW3 10/11/1990 29 8.5 to 28.5 6 to 30.5 d 0 to 6 Downgradient of Pond 3, adjacent to Sugar Cut. <br /> WWTP-MW4 10/11/1990 30.5 10 to 30 8 to 30.5 d 0 to 8 On west side of Pond 2,adjacent to ditch feeding Sugar Cut. <br /> WWfP-MW5 10/10/1994 40 18 to 38 13.2 to 40 10.8 to 13.2 0 to 10.8 Background well. <br /> WWTP.-MW6 01/03/2008 35 15 to 35 1.1.5 to 358 9.6 to 11.5. 0 to 11.5 Background well.. <br /> WWfP-MW7 01/03/2008 35 15 to 35 11.5 to 358 . 9.5 to 11.5 0 to 9.5 Downgradient of sludge drying beds and the biosolids <br /> storage area. <br /> WWTP-MW8 01/18/2008 25f 13 to 23. 10 to 23.58 8 to 10 0 to 8 Downgradient of biosolids storage area and the pretreatment <br /> lagoons. <br /> Notes: <br /> a Wells are each installed with Schedule 40 PVC casing and screen(0.020 inch machined slots). No centralizers were used. <br /> b As measured from ground surface. Determined during drilling and well installation. <br /> c Includes concrete pad. <br /> d The monitoring well installation report indicates 2 feet of bentonite pellets were installed for each well. However, specific intervals were not recorded. <br /> e Includes fine sand(#60). <br /> f Bentonite chips were installed between 23.5 and 25 feet below grade. <br /> April 15,2008 10 <br />