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. • Margaret Lagorio [EH] Page 1 of 1 From: Margaret Lagorio [EH] Sent: Friday, July 24, 2009 11:59 AM To: 'Brian.Westhoff@stantec.com' Cc: 'Jim Barton' Subject: Well destructions for 225 Cherokee, Lodi Brian, This is to document the telephone conversation we had this morning. The work plan for well destruction for 225 Cherokee, Lodi, states that MW4, MW7, MW9,VP3, VW1 through VW5 and VW7 through VW11 will be pressure grouted (describes method required by San Joaquin County)and that MW1 through MW3, MW5, MW6, MW8, VP2 and VP4 will be overdrilled and the borehole grouted. There is no explanation for the decision on how the wells will be destroyed. The Central Valley Regional Water Quality Control Board letter dated May 29, 2009, advised you that our agency would issue the well destruction permits and to obtain concurrence from our agency on the proposed methods for well destruction. San Joaquin County Well Standards require that a well located in an area of contamination be destroyed by removing all the material in the origianal borehole (overdrill)and fill the hole with appropriate sealing material. Vapor wells 4, 5 and 9 had significant concentrations of contamination in the soil samples collected when they were drilled so San Joaquin County requires that these wells be overdrilled and grouted. Vapor probes VP2, VP3, and VP4 were all constructed with 1/4" tubing so VP3 cannot be pressure grouted and must be overdrilled as well. Monitoring wells MW5, MW6 and MW8 can be pressure grouted if you would like to change their proposed method for destruction from overdrilling to pressure grouting. Margaret Margaret Lagorio, REHS Program Coordinator Unit IV San Joaquin County Environmental Health Department 600 E. Main Street Stockton, CA 95202 Phone:(209)468-3449 Fax: (209)468-3433 E-mail: mlagorio@sjcehd.com