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I Mr Harlan Knoll August 9, 2001 • Page 5 of 7 I4.0 SENSITIVE RECEPTOR SURVEY ' On May 10, 2001, field reconnaissance was performed in order to identify and confirm the locations of potential sensitive receptors, including domestic wells, surface-water bodies, ' churches, and schools, within a 2000-foot radius of the subject site Tabulated data and source information are included in Table 4 Receptor locations are identified on Figure 5 Well logs obtained by the California Department of Water Resources (DWR) are included in Attachment D ' Results of the sensitive receptor survey are summarized below Wells ' Based on information obtained from the California Department of Water Resources (DWR), United States Geological Survey (USGS), and a physical reconnaissance of the area, as many as seventeen water supply wells may be located within 2,000 feet of the subject site However, ' based upon the documented groundwater flow direction beneath the site (to the southwest), none of the wells are located within downgradient of the subject site Specific information on the identified wells is as follows ' "Wells A-E and G-L" These wells were visually identified during the site reconnaissance and no specific information regarding construction is available The nearest of these wells is ' located approximately 280 feet west of the subject site Wells B and E, located approximately 520 feet east and 1,540 feet southeast, respectively, of the site are reportedly a water supply wells maintained and operated by San Joaquin County Public ' Works According to Mr Ron Raul of Public Works, all residences and businesses in Thornton are hooked up to the County water system Refer to Table 4 and Figure 5 for specific locations of identified wells ' "Well F" According to DWR records, this well is (or was) located approximately 1640 feet east of the subject site The well was reportedly constructed in October 1956, and was ' completed to a depth of 68 feet bgs Casing consisted of 8-inch diameter welded steel to 56 feet bgs, apparently with open hole between 56 feet and 68 feet bgs This well could not be located during reconnaissance of the area ' Well NT' According to DWR records this well is (or was) located approximately 2,000 feet west of the subject site The well was reportedly constructed in February 1956, and was ' completed to a depth of 86 feet bgs Eight-inch casing was installed to a depth of 78 feet bgs, apparently with open hole between 78 feet and 86 feet bgs This well could not be located during physical reconnaissance of the area ' "Wells N-T" These wells were identified through DWR records and may be located within 2,000 feet of the subject site, based on standard naming of wells by township, range, and section These wells could not be accurately located on Figure 5, however due to inadequate information on exact location (lack of sketch, etc) 1 ' G 1Data1GROUNDZE\Barnyard-ManserlReports\WELLRPT doc