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the groundwater samples collected from boring CPT-21, northeast and . crossgradient of boring CPT-18 This boring defines the eastern extent of contamination downgradient of the site Groundwater samples collected from boring CPT-17, southwest of boring CPT-18, contained 1 2 ppb MTBE at a depth of 38-feet bgs No MTBE, or any other compound, was detected in the groundwater samples collected from 16-feet bgs, 63-feet bgs or 92-feet bgs Similar MTBE concentrations recently were detected for the first time in groundwater samples collected from domestic wells located on the west side of 17933 Airport Way and 17971 Airport Way, both of which are very close to this boring This boring does not define the full extent of MTBE to the west, but it does define the extent of MTBE to a relatively low concentration of 1 2 ppb in this down/cross gradient location Since MTBE was only recently detected in the domestic wells near this location, this boring appears to roughly define the extent of MTBE in this direction No MTBE was detected in groundwater samples collected from boring CPT-22, the next downgradient boring from CPT-18 The only compounds detected in groundwater samples collected from boring CPT-22 were 0 51 ppb 1,2-DCA and 0 97 ppb 1,2-DCP from the sample collected from 158- feet bgs None of the groundwater samples collected from any of the • shallower zones contained detectable concentrations of any of the compounds analyzed The domestic well located on this property has never contained concentrations of any compound analyzed The bottom of this domestic well is apparently 70-feet bgs, based on information written on the tank at the well head In addition, no MTBE or any other compound analyzed was detected in groundwater samples collected from boring CPT-25, in the rear portion of this property, and near the domestic well located at 17793 Airport Way These borings appear to define the extent of MTBE to the northwest, although a trace MTBE concentration was previously detected in groundwater samples collected from the domestic well located at 17737 Airport Way No MTBE was detected in groundwater samples collected from boring CPT-19, crossgradient of boring CPT-22, however, 22 ppb TBA was detected in the groundwater sample collected from 15-feet bgs No TBA or MTBE has been detected in any of the domestic wells in this area except the well located at 2 3 8 Airport Way, north of this boring It is possible that there may b e another source of MTBE in this area, and it was previously noted that the pump on the well located at 238 Airport Way was gasoline powered with the tank adjacent to the open (uncovered) well The only compound detected in groundwater samples collected from the • line of borings furthest from the site (borings CPT-20, CPT-23 or CPT-24) Franks One Stop Report -- March 2001 -20-