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Page 1 of 2 <br /> Harlin Knoll [EH] <br /> From: Capps, Mark[Mark.Cap ps@aecom.com] <br /> Sent: Tuesday, September 29, 2009 9:36 AM F <br /> To: Harlin Knoll [EH] <br /> Subject: RE: 1240 Navy <br /> Hi Harlin <br /> Yes, there were two phases of well installation and the original 3 wells were destroyed by overdriling (MW-1 and <br /> 3)and pressure grouting (MW-2). Chronology and brief summary are provided below: <br /> r <br /> • May 1989 installation of MW-1, MW-2 and MW-3 by EMCON. <br /> • January 19, 1993 Mark Group submittal of Work Plan for Supplemental Soil and Groundwater Investigation <br /> and Soil Remediation to County EHD <br /> • January 23, 1993 EHD approval of Work Plan' <br /> • February 3, 1993 destruction and sealing of MW-1, MW-2, and MW-3 by the Mark Group <br /> • January, June and July 1993 Phases of soil excavation <br /> • .February 1, 1993 Mark Group submittal Abandonment of Monitoring Wells MW-1, MW-2 and MW-3 <br /> outlining destruction methods. <br /> • May 1993 installation of new MW-1, MW-2, and MW-3 by the Mark Group <br /> • October 1993 installation of MW-4 by the Mark Group <br /> I don't have the original EMCON well installation report, and it was.not available when we obtained County files or <br /> reviewed CVWB files. <br /> February 1, 1993 Mark Group Letter Re:Abandonment of Monitoring Wells MW-1, MW-2 and MW-3 outlines the <br /> well abandonment methods that will be used - MW-1 and 3 were proposed to be overdrilled and grouted; MW-2 <br /> was to be pressure grouted because it was within tli6 overexcavation area. <br /> The Mark Group June 17, 1994 Preliminary Closure Report(page 1-3 and page 4-1) references destruction and <br /> sealing of three pre-existing monitoring wells" No additional details are provided <br /> These other reports were obtained during EHD file review. <br /> Let me know if you need any additional information <br /> Mark Capps, PG <br /> Senior Project Manager <br /> AECOM Environment <br /> D: NOTE NEW TEMPORARY DIRECT LINE (916) 8304355 <br /> this number will be in effect until mid October <br /> C: (916)207-1290 <br /> rnark.capps@aecom._com- <br /> AECOM <br /> 10461 Old Placerville Rd Suite 170 <br /> Sacramento, CA 95827 <br /> T: (916) 362-7100 <br /> F: (916) 362-8100 <br /> www.aecom.com <br /> 9/29/2009 <br />