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1 <br /> GeolagtralTeck�clCslac Page 5 <br /> Groundwater Monitoring Report <br /> Project No 723 2 <br /> August 31,2004 <br /> ' TPH-G concentration (6010 ug/l) than the intermediate MW-108 sample (724 ug/L) and this <br /> situation is the reverse of the initial March 2004 event <br /> ' As required under AB2886, laboratory and g migroundwater elevation data were submitted <br /> electronically to GeoTracker on June 18 and July 14, 2004 - confirmation numbers <br /> ' 1683212816 & 8954167008, 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 CMTrm 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-7, MW-9, MW-107, MW-109, MW-201, MW-207 and MW-209 did not contain <br /> petroleum hydrocarbon contaminants above the laboratory reporting limits <br /> 1 TPH-G <br /> • The shallow wells contained TPH-G concentrations ranging <50—35,200 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 1350 ug/1 TPH-G <br /> • The intermediate wells contained TPH-G concentrations ranging <50 - 147,000 <br /> ' ug/l <br /> o The highest level of TPH-G was detected in well MW-3 that is located <br /> adjacent to the former dispenser island <br />' o Well MW-109 is clean and defines the up gradient extent of the plume <br /> o Down gradient well MW-108 contained 6010 ug/l TPH-G <br /> • The deep wells contained TPH-G concentrations ranging<50 - 724 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-209 is clean and defines the up gradient extent of the plume <br /> o Well MW-101 contained 76 5 ug/1 TPH-G This well intermittently contains <br /> contaminants <br /> 1 <br />