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Geological Teckaks Inc Page 5 <br /> Groundwater Monitonng Report <br /> Project No 723 2 <br /> June 15,2004 <br />' 1.3 Laboratory Analyses <br />' The groundwater samples collected on March 21 and 23, 2004, were delivered to California <br /> Laboratory Services of Rancho Cordova, Calitomia (certification #1233) for analyses of <br /> v Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX) by EPA method 8260B <br />' ❑ Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 8015(M) <br /> ❑ Oxygenated Fuel Compounds (MTBE, DIPS, ETBE, TAME & TBA) by method <br />' 8260B <br /> ❑ 1,2 DCA & EDB by EPA method 8260B <br /> ❑ Ethanol by EPA method 8015 <br />' The detection limits for the above analyses are listed in Table 2 of Appendix A, while the <br /> lab analytical results are presented in Appendix B <br /> As required under AB2886, groundwater elevation and laboratory data were submitted <br /> electronically to GeoTracker on May 10, 2004 - confirmation numbers 1345407366 & <br />' 8570606827, respectively <br /> 2.0 FINDINGS AND DISCUSSION <br /> Groundwater samples were obtained from the existing wells and from three screened <br />' intervals in each of the new CMT7m wells The wells were grouped according to the aquifer <br /> interval that the screened section intercepted (see Figure 14 for well screen intervals) <br /> Shallow Wells (screened 35 —45 feet bgs) MW-4, 5, 6, 7, 8 & 9 <br /> Intermediate Wells (screened 43 — 70 feet bgs) MW-1, 2, & 3 and MW-107, 108 & 109 <br />' Deep Wells (screened 76 —92 feet bgs) MW-101 and MW-207, 208 & 209 <br /> The results of the groundwater sample analyses indicate the following <br />' Wells MW-9, MW-101, MW-109, MW-207 and MW-209 did not contain petroleum <br /> hydrocarbon contaminants above the laboratory reporting limits <br /> 1 TPH-G <br /> • The shallow wells contained TPH-G concentrations ranging <50 - 24,000 ug/l <br />' o The highest level of TPH-G was detected in well MW-5 that is located cross <br /> gradient of the former dispenser island <br /> o Well MW-9 is clean and defines the up gradient extent of the plume <br />' o Down gradient well MW-8 contained 580 ug/l TPH-G <br /> • The intermediate wells contained TPH-G concentrations ranging <50 - 110,000 <br /> ug/l r <br /> i <br />