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Proiect Number 1804BK04 March 22 2007 MW-14BB: This well is located along South Washington Street, between East Oak and east Walnut Streets. This well has been sampled quarterly from January 2004 through September 2006. PCE has been detected intermittently at concentrations ranging from 1.0 µg/L to 1.8 µg/l_ during this time period. Detected concentrations of PCE in this well are low. In addition, PCE has been reported as non-detect in this well since December 2004. As it is likely that PCE will continue to be reported as non-detect in this well, it is proposed that this well be sampled on an annual basis instead of a quarterly basis. MW-15BB: This well is located along South Sacramento Street, just south of West Lodi Avenue. This well has been sampled quarterly from January 2004 through September 2006. PCE has been reported as non-detect during this time period. As it is likely that PCE will continue to be reported as non-detect in this well, it is proposed that this well be sampled on an annual basis instead of a quarterly basis. MW-16BB: This well is located south of the southern end of the PCE plume core along South Main Street. This well has been sampled quarterly from January 2004 through September 2006. PCE has been detected at concentrations ranging from 2.7 µg/L to 5.0 µg/L during this time period. As this well monitors the area south of the PCE plume core, it should continue to be monitored on a quarterly basis. MW-17BB: This well is located along South Stockton Street, south of West Lodi Avenue. This well has been sampled quarterly from January 2004 through September 2006. PCE has been reported as non-detect during this time period. As it is likely that PCE will continue to be reported as non-detect in this well, it is proposed that this well be sampled on an annual basis instead of a quarterly basis. MW-18BB: This well is the southern-most groundwater monitoring well, located along South Main Street near East Flora Street. This well has been sampled quarterly from September 2005 through September 2006. PCE has been reported as non-detect during this time period. It is likely that PCE will continue to be reported as non-detect in this well. However, this well is the most downgradient well in the monitoring well network. As such, it is proposed that this well be sampled on a semi-annual basis instead of a quarterly basis. MW-19BB: This well is located along North Main Street between East Pine and East Oak Streets. This well has been sampled quarterly from September 2005 through September 2006. PCE has been detected at concentrations ranging from 21 pg/L to 290 pg/L during this time period. As this well monitors a portion of the PCE plume core, it should continue to be monitored on a quarterly basis. DW-1 BB: This deeper well is located along East Pine Street adjacent to wells MW-1 BB and MW-7BB, which monitor the northern portion of the PCE plume core. This well has been sampled quarterly from January 2004 through September 2006. PCE has been reported as non-detect during this time period. As it is likely that PCE will continue to be reported as non- detect in this well and because it monitors deeper groundwater beneath the northern plume core area, it is proposed that this well be sampled on a semi-annual basis instead of a quarterly basis. EZC Remediation 4