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TABLE 5-1 <br /> GROUNDWATER ANALYTICAL RESULTS <br /> October 1, 2001 <br /> Well Collection TPH-D Benzene Ethyl- Toluene Total MTBE <br /> Number Date (ug/L) (ng/L) benzene OWL) Xylenes <br /> (ug/L) <br /> MW3 12/18/00 ND ND ND ND ND ND <br /> 3128101 150 ND ND ND ND ND <br />' 6/28/01 ND ND ND ND ND ND <br /> 1011/01 ND ND ND ND ND ND <br /> jLaboratory -- 50 0 50 0 50 0 50 050 5 0 <br /> Reporting <br /> Limits <br /> ugll, micrograms per liter <br /> ND Not detected at or above the indicated laboratory reporting Imut <br /> TPH-D Total Petroleum Hydrocarbons-Diesel <br /> MTBE Methyl tent butyl ether <br /> 6.0 CONCLUSIONS <br /> AT&T performed the fourth quarter of monitoring on three groundwater quality monitoring wells at the subject <br /> AT&T, riucrowave relay facility Groundwater samples collected from these wells were found to have no <br /> detected concentrations of TPH-D,BTEX,or MTBE This represents no change from the previous quarter <br /> The groundwater elevations for wells MW 1 through MW3 measured at the time of this sampling event)Indicated <br /> that the groundwater flow direction is to the southwest, as illustrated on Figure 2, at a gradient of approximately <br /> 0 004 The groundwater gradient was calculated by geometric methods,i e,a this-point problem <br /> ATC has hued four of groundwater monitoring and sampling at the site No further monitoring of <br /> camp quarters <br /> sac wells is planned Analytical testing of water samples collected throughout these four rounds has found no <br /> detected concentrations of BTEX or MTBE TPH-D was detected once at a concentration of 150 ug/L in well <br /> MW3 All other waxer samples were found to have no detected concentrations of TPH-D Based upon these <br /> analytical results, ATC requests closure of this UST removal site from the Public Health Services San Joaquin <br />' County, Environmental Health Division and froth the Central Valley Regional Water Quality Control Board <br /> AT&T—Lodi,Quarterly Groundwater Monitoring Report No I <br /> 0 <br /> MATC ATC Project No 75 75128 0001 <br /> November 14,2001 <br /> Page 6 of 7 <br />