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08/21/97 THU 09:07 FAX 909 335 6120 SECOR REDLANDS 2003 <br /> Groundwater samples from the four wells purged were submitted to Del Mar Analytical to <br /> be analyzed for volatile fuel hydrocarbons(Wlis), reported as gasoline,and extractable fuel <br /> hydrocarbons (EFHs), reported as diesel, by EPA Test Method 8015 (Modified), benzene, <br /> toluene, ethylbenzene, total xylenes (BTEX) and methyl tert-butyl ether (MTBE) by EPA <br /> Test Method 8020 and volatile organic compounds(VOCs)by EPA Test Method 8240. The <br /> laboratory data sheets are attached to this report as Appendix C. <br /> Summary of Field Results <br /> June 24, 1997 <br /> Groundwater depths in the four wells purged and sampled ranged from 8.25 to 9.50 feet <br /> below top of well casing. The data collected indicated a decline in groundwater depths of <br /> approximately 0.2 feet from those obtained by SECOR in May 1997. A summary of the data <br /> obtained is presented in Table 1. <br /> Using the data obtained, the groundwater gradient beneath the facility was determined to <br /> be approximately 0.004 feet per foot, or roughly 20.1 feet per mile. The groundwater flow <br /> direction was to the northwest. Figure 1 is a contour map for the groundwater surface <br /> beneath the property using the June 24, 1997, data. <br /> July 9, 1997 <br /> Groundwater depths in the three wells purged and sampled ranged from 8.36 to 9.61 feet <br /> below top of well casing. The data collected indicated a decline in groundwater depths of <br /> approximately 0.1 foot from those obtained by SECOR in June 1997. A summary of the data <br /> obtained is presented in Table 1. <br /> Using the data obtained, the groundwater gradient beneath the facility was determined to <br /> be approximately 0.005 feet per,foot, or roughly 23.9 feet per mile. The groundwater flow <br /> direction was to the west. Figure 2 is a contour map for the groundwater surface beneath <br /> the property using the July 9, 1997, data. <br /> Summary of Analytical Results <br /> June 24, 1997 <br /> Except for ethylbenzene at 5.7 micrograms per Liter (µg/L) in MW-4, dissolved phase <br /> petroleum hydrocarbons, BTEX, MTBE and VOC s were not reported by the laboratory <br /> above MDU in the groundwater samples collected from the four monitoring wells purged <br /> and sampled. A summary of the analytical results obtained is presented in Table 1 and <br /> Table 2. <br /> JN 40007-1301 <br /> TRACY.Rrr 2 <br />