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• S ECOR - _ w <br /> Mrs. Kristi Shelton <br /> April 17, 2008 <br /> Page 3 <br /> test pit adjacent to the loader underground piping. No detectable benzene or toluene was <br /> reported in the 27 samples collected from the test pits. STLC lead was analyzed in four <br /> samples, and was detected in at concentrations ranging from 0.21 to 0.26 ppm. <br /> Groundwater monitoring and sampling was performed at the site on a quarterly basis from 1991 <br /> through 1994. From 1995 through 1999, semi-annual groundwater monitoring and sampling <br /> was performed. It appears that groundwater monitoring was ceased during 2000, 2001, 2002, <br /> and 2003. Sampling of the wells was conducted once in 2004 and once in 2005. Quarterly <br /> groundwater monitoring and sampling was re-initiated during the first quarter 2006 and <br /> continued for one year. The last quarterly report submitted was for the first quarter of 2007. <br /> Since the fourth quarter of 2004, the groundwater gradient has been predominantly toward the <br /> northwest. <br /> SENSITIVE RECEPTORS <br /> In May 2005, ATC performed a field receptor survey to locate private wells or other receptors <br /> within 1,000 feet of the site. A domestic groundwater supply well (WSW-1) was located on the <br /> site property itself. This well was reportedly 1,136 feet deep and used for non-potable <br /> sanitation purposes. Two nearby domestic wells were identified. One domestic well was <br /> located at 8197 East 11th Street approximately 130 feet southeast of the Site. Another well was <br /> observed at 8188 East 11th Street approximately 370 feet south-southeast of the Site. ATC <br /> was unable to reach the owners of these two wells. A concrete lined irrigation canal running <br /> east to west between 11th Street and the Site was also observed during the field receptor <br /> survey. The canal emerged from underground just west of the site. <br /> In October 2005, ATC Associates, Inc. subcontracted GeoSearch to conduct a '/2-mile radius <br /> sensitive receptor survey. Two wells were identified in this search. In addition to the on-site <br /> water supply well, an unidentified well located approximately 2,500 feet to the west-northwest of <br /> the site, drilled to 850 feet bgs, was also identified. <br /> SECOR International Incorporated <br />