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' C1M4) &al Teckxfa 1M r. Page ge 5 <br /> Groundwater Moratonng Report <br /> Project No 723 2 <br /> February 28,2005 <br /> ' The detection limits for the above analyses are listed in Table 2 of Appendix A, while the lab <br /> analytical results are presented in Appendix B <br /> ' As required under AB2886, laboratory and groundwater elevation data were submitted <br /> electronically to GeoTracker on February 8, 2005 - confirmation numbers 5493812680 & <br /> ' 1092390298, 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 CMTTM wells (except as noted above) The wells were grouped <br /> according to the aquifer interval that the screened section intercepted (see Figure 14 for well <br /> ' screen intervals) <br /> Shallow Wells (screened 35 —45 feet bgs) MW4, 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 and MW-107 did not contain petroleum hydrocarbon contaminants above the <br /> ' laboratory reporting limits <br /> 1 TPH-GBTEX <br /> ' • The shallow wells contained TPH-G concentrations ranging<50—26,300 ugA <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 shallow plume <br /> o Down gradient well MW-8 was dry for the event but has consistently <br /> contained TPH-G <br /> ' • The intermediate wells contained TPH-G concentrations ranging <50 - 142,000 <br /> ug/l <br /> ' o The highest level of TPH-G was detected in well MW-3 that is located in the <br /> vicinity of the former dispenser island <br /> o Well MW-109 contained 0 5 ug/l xylene, the first detection since its <br /> ' installation This well usually defines the up gradient extent of the plume <br /> o Down gradient well NIW-108 contained 1,300 ug/1 TPH-G <br /> • The deep wells contained TPH-G concentrations ranging<50—4,020 ug/1 <br /> ' o The highest level of TPH-G was detected in well MW-208 that is located <br /> down gradient of the former dispenser island <br /> o Well MW-201 contained trace BTEX (0 4 — 10 ug/1) and has previously <br /> ' contained trace contaznination <br /> 1 <br />