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K L E I N FELDER EXPECT MORE Five wells are proposed in the southeast portion of the site. Two wells are proposed in application Area C and three in the larger application Area B. One well will be located up and down-gradient of Area C. One well will be located up-gradient and two wells will be located down-gradient of Area B. A total of four wells are also proposed in the western portion of application Area A and near proposed holding Ponds 2 and 4. Three of the four wells are proposed around Ponds 2 and 4. Because of the proximity of these two ponds, Kleinfelder is treating these two ponds as effectively one pond in terms of monitoring. Therefore 1 well is located upgradient in this area and two downgradient, assuming a west by northwest groundwater gradient. A single well has been sited downgradient of approximately three quarters of application Area A. A single well is proposed in Area A, due to the irregular shape of Area A and since background and upgradient monitoring locations are covered by the existing monitoring well network (MW- 5 through MW-7). Monitoring well MW-5 is sited such that it appears this well can continue to monitor upgradient conditions of both proposed holding Pond 1 and application Area A in the near future. As noted earlier, the proposed monitoring locations are based on groundwater flow directions noted from the existing monitoring well network (MW-5 through MW-7 only) and historical groundwater flow directions. Groundwater flow directions derived from monitoring wells MW-1 through MW-4 are not being considered at this time, since the groundwater flow in this area (WWTP), is estimated to be strongly influenced by former pumping of Oakwood Lake and it is presently assumed the groundwater flow in the WWTP area will change directions at least seasonally from northeast to northwest. In addition, the WWTP wells are not located in the near vicinity of the proposed well locations. 1.4 SITE MAPS AND NEARBY FEATURES Kleinfelder has included a copy of the site area from a US Geological Survey 7.5 Minute topographic map dated 1952 and photorevised 1987 (Plate 2) and a site map (Plate 1). These two maps depict one or more of the following: site features, surface topography, nearby surface water bodies, onsite wells, proposed well locations, surface water bodies, proposed application areas etc. The site is shown as relatively flat at an elevation of approximately 15 feet above mean sea level (msl). A slight regional slope is noted towards the northwest. The site is bordered by surface water bodies to the west (San Joaquin River) and the south (Walthall Slough). 48093.E01/ST07R052/CJC/Iv Page 4 of 15 ©2007 Kleinfelder, Inc January 26, 2007