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y <br /> Chronology <br /> 8960 Walnut Grove Rd. <br /> Pg. 2 <br /> 05-17-01 4 MWs were installed: one in the former UST area and 3 outside the <br /> excavation. All wells were screened from 4 feet to 24 feet bgs. <br /> 08-09-01 Completion date of Ground Zero's Ground Water Monitoring Well <br /> Installation Report which contained soil and ground water analytical <br /> results. <br /> 05-23-02 Additional MWs were required by.EHD. <br /> 09.05-02 EHD approved Ground Zero 8-8-02 WP for 3 additional MWs- <br /> 10-30-02 3 additional MWs installed down gradient of source area. <br /> 01-08-03 Completion date of Ground Zero's Ground Water Monitoring Well <br /> Installation Report. Three MWs installed with screen intervals from 4-19 <br /> feet bgs. <br /> 09-04-03 Ground Zero prepared and submitted the Site Closure Documents report <br /> requesting"No Further Action". MW 3 located approximately 75 ft. west <br /> of the former UST area is the only MW with MTBE above'5 ppb. MTBE <br /> in MW 3 is 100 ppb and concentrations are declining over time. An <br /> additional sample will be collected and analyzed to confirm this declining <br /> trend. <br /> 12-23-03 3`d Quarter 2003 Monitoring Report received and reviewed. All MWs are <br /> below 5 ppb MTBE with the exception of MW#3. MW#3�continues to <br /> decline and is currently 86 ppb MTBE. Thirty-day closure concurrence <br /> letter will be sent to the CVRWQCB. <br /> Hkchron8960walnutgrove <br />