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Geologkoll TCCh k$!nc Page 6 <br /> ' Groundwater Monitoring Report <br /> Project No 723 2 <br /> October 25, 2005 <br /> ' As required under AB2886, groundwater elevation and laboratory data were submitted <br /> electronically to GeoTracker on October 24, 2005 - confirmation numbers 6385406315 & <br /> ' 1338044166, respectively <br /> ' 2.0 FINDINGS AND DISCUSSION <br /> Groundwater samples were obtained from the existing wells and from the top three screened <br /> ' intervals in each of the CMTrm wells (except as noted above) <br /> ' The results of the groundwater sample analyses indicate the following <br /> Well MW-201 did not contain petroleum hydrocarbon contaminants above the laboratory <br /> ' reporting limits <br /> 1 TPH-G <br /> • The shallow wells contained TPH-G concentrations ranging 55 5 — 23,300 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 Up gradient well MW-9 contained 90 5 ug/1 TPH-G and this is the first <br /> detection of this contaminant in this well since its installation <br /> o Down gradient well MW-8 was dry for the event <br /> ' • The intermediate wells contained TPH-G concentrations ranging 71 5 - 117,000 <br /> ug/1 <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 Up gradient well MW-109 contained 76 5 ug/l TPH-G and this is the first <br /> detection this constituent since the wells installation <br /> ' o Down gradient well MW-108 contained 2360 ug/1 TPH-G <br /> • The deep wells contained TPH-G concentrations ranging 56 7 —5500 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-207 contained TPH-G for the fourth consecutive event This well <br /> ' previously defined the northerly extent of the plume <br /> o Up gradient well MW-209 contained 56 7 ug/l TPH-G and this is the first <br /> detection of this constituent in this well <br /> ' • Deep well MW-101 contained 241 ug/1 TPH-G <br /> 2 MTBE <br /> • None of the wells sampled contained MTBE above the laboratory reporting limits <br /> ' • EPA Method 8260B was utilized for this event <br /> 3 Benzene <br /> • The shallow wells contained benzene concentrations ranging c0 5 - 285 ug/1 <br />