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. 15 July 2002 AGE -NC Project No 96-0232 Page 20 of 21 8.0 RECOMMENDATIONS Based upon data collected from the site, AGE recommends • Continued quarterly ground water monitoring and sampling of monitoring wells MW -1 through MW -13 • Continued coordinated quarterly ground water monitoring and sampling events with Three B's Truck Plaza • Continued ground water extraction from wells EW -4 and EW -5, extraction wells EW -7, EW -8, EW -9 and EW -10 should be alternated Into the ground water extraction system • Upon UST Cleanup Fund pre -approval, additional assessment shall be performed In First Zone, Second Zone and Rocky's Upper Zone in the area of MW -8 • Silica gel cleanup of future ground water samples by the analytical laboratory to eliminate possibility of biological Interference in TPH-d chromatograrns is AGE believes that the existing quarterly ground water monitoring program at this stage of the investigation is no longer cost effective Therefore, AGE is proposing the following changes (reductions) to the existing ground water monitoring program to supplement the ongoing Investigation • Reduce quarterly monitoring of San Joaquin County municipal wells CSA -1 and CSA -2 to annual monitoring events AGE believes that the location of well MW -10 is sufficiently located to protect the interests of wells CSA -1 and CSA -2 • Due to two separate Investigations between the Three B's Truck Plaza and Flag City Chevron, AGE proposes to transfer the responsibility of monitoring domestic water well DW -1 and Flag City Chevron monitoring well MW -13 over to the Three B's Truck Plaza ground water investigation since the wells are located on the Three B's Truck Plaza property • By transferring responsibility of monitoring well MW -13 to the Three B's Truck Plaza, EDB and 1,2 -DCA can be eliminated from the ground water monitoring program for the Flag City Chevron site since neither constituent has been detected by laboratory analysis in any other wells during the investigation • Reduce the testing frequency for the constituents methanol and ethanol from quarterly monitoring to annual monitoring events since neither constituent has been detected for 8 consecutive sampling events, AGE suspects the previous detection of ethanol was due to the ethanol -coated bentonite during well installations Advanced GeoEnvironmental, Inc.