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ATTACHMENT B:MAP OF WELLS/AREA OF REVIEW included on the water well drillers reports. Additionally, some residences appear in aerial photographs for which well records were not identified. It is possible that a single domestic well supplies water for more than one residence. The majority of the domestic supply wells within the AOR are located to the east of I-5. The shallowest domestic well identified within the AOR was 51 feet deep. The deepest domestic well identified was 220 feet deep. Irrigation Supply Wells Surface water is available throughout the AOR delivered through drains, ditches,and canals,but groundwater is used to supplement surface water supplies to the east of I-5. The only irrigation well within the AOR located west of 1-5 is at the golf course on 8-Mile Road. Approximately 35 irrigation wells were identified within the AOR. Like the domestic well inventory, the exact number of irrigation wells is uncertain because water well completion reports are not available for each well, and records for some locations were uncertain or incomplete. Irrigation wells generally tend to be deeper than domestic wells. The shallowest irrigation wells within the AOR were 68 feet deep. Shallow irrigation wells in the area are possible because groundwater is so shallow. Irrigation wells up to 450 feet deep occur within the AOR. Monitoring Wells Monitoring wells occur in several locations within the AOR, associated with three investigations. These are: • The WPCP percolation ponds • Groundwater investigation along Banner Street in the Flag City area • Groundwater investigation at the Three B's Truck Plaza The monitoring wells installed along Banner Street and surrounding the WPCP are generally 50 feet deep or shallower. The truck plaza monitoring wells are 150 feet deep and contain multiple monitoring intervals. Because the Banner Street and truck plaza investigations are located at the northern edge of the AOR and are very limited in aerial extent,they are not discussed further. A series of 22 shallow monitoring wells have been installed near the WPCP. These wells, which extend approximately 20 feet bgs,have been installed to monitor conditions upgradient and downgradient of the percolation ponds at the WPCP. Oil and Gas Wells There are four natural gas fields located near the STIG-LEC facility: Harte Gas to the Southeast,Lodi Airport Gas to the East,King Island Gas to the West,and East Islands Gas to the Northwest (see Figure B-5). Of these four, King Island is the only natural gas field with active wells,while the Harte, Lodi Airport,and East Islands fields have all been abandoned. The King Island Gas field has three active wells, one of which is located within the AOR for this project. This well,Piacentine 1-27,is the only well in production in the AOR. The DOGGR online well database also identified seven dry holes in the AOR. B4 SAG371322I082550015(ATTACHMENT-B.DOC)