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4.3 ANALYTICAL METHODS <br /> The following chemical analyses were performed by Kiff Analytical LLC (State Certification No 2236) on the <br /> groundwater samples <br /> • Total Petroleum Hydmcarboris—Diesel Fuel(FPH-D)(EPA Method 8015 Modified), <br /> • Benzene,toluene,ethylbenzese and total xylenes(BTEX)(EPA Method 6260B),and <br /> • Mdhyl Cert butyl ether(MTBE) (EPA Method 6260B) <br /> 5.0 INVESTIGATION RESULTS <br /> 5.1 GROUNDWATER FIELD OBSERVATIONS <br /> Groundwater was encountered in three wells m the study area at depths ranging from approximately 29 9 to 30 1 <br /> feet bgs Figure 2 is a groundwater contour map This map shows the groundwater surface to slope in a <br /> southwesterly direction at a gradient of about 0 004 ft/ft <br /> Groundwater initially removed from each monitoring well was clear with no floating product, no sheen, and no <br /> hydrocarbon odor With continued bailing of the wells, suspended clays and silts were observed in the water <br /> throughout removal of the three well volumes prior to sampling <br /> 5.2 LABORATORY ANALYTICAL.RESULTS <br /> M A summary of the groundwater sample chemical test results are presented in Table 5-1 Laboratory reports <br /> for all tests are included m Appendix C A total of three groundwater samples were collected on October 1, <br /> 2001 and submitted for laboratory analysis The groundwater samples had no detectable concentrations of TPH- <br /> D,BTEX,or MTBE <br /> TABLE 5-1 <br /> GROUNDWATER ANALYTICAL RESULTS <br /> October 1, 2001 <br /> Well Collection TPH-D Benzene Etbyl- Toluene Total MTBE <br /> Number Date (ug/L} OWL) benzene (ug/L} Xylenes OWL) <br /> OWL) (ug/L) <br />' MW 1 12/18/00 ND ND ND ND ND ND <br /> 3/28101 ND ND ND ND ND ND <br /> 6128101 ND ND ND ND ND ND <br /> 10/1/01 ND ND ND ND ND ND <br /> MW2 12/18/00 ND ND ND ND ND ND <br /> 3/28/01 ND ND ND ND ND ND <br /> 6/28/01 ND ND ND ND ND ND <br /> 10/1/01 ND ND ND ND I ND ND <br /> AT&T—Lodi,Quarterly Groundwater Momtonng Report No I <br /> NATC ATC Project No 75 75128 0001 <br /> November 14,2001 <br /> Page 5 of 7 <br />