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. • Page 1 of 1 <br /> Frank Girardi [EH] <br /> From: Frank Girardi [EH] <br /> Sent: Friday, May 30, 2008 5:33 PM <br /> To: 'Roger.Lucich@CH2M.com' <br /> Cc: Margaret Lagorio [EH] <br /> Subject: Cook Road destruction of deeper wells N-21, N-22,& N-23 <br /> Roger, <br /> In follow up to our conversation, EHD requests that you submit a work plan (w/engineer stamp and signature)to <br /> describe that the pressure grouting method to destroy the deeper wells N-21, N-22, and N-23 will not cause a <br /> cross contamination problem now or in the future with Regional Board approval. Also, the WP should also <br /> describe the procedure for the well destruction to be in compliance with the SJC code. The pressure grouting <br /> shall be done by excavating a hole at least 1' larger than the diameter of the originally drilled hole to a depth of a <br /> min. of 3' bsg (this shall include the conductor casing). Then cut the conductor casing and PVC casing 6"from the <br /> bottom of the hole. Then pressure grout and allow the grout to cap/spill over 1' greater than the diameter of the <br /> casing. The exposed casing shall be covered with at least 6"of grout and backfilled with native soil. <br /> The wording for the SJC code for pressure grouting is noted below: <br /> For the protection of the seal, and to facilitate the future use of the land site, a hole at least one foot <br /> larger in diameter than the originally drilled hole shall be excavated around the outside of the well <br /> casing to a depth not less than three feet below the ground surface. The well casing shall then be cut <br /> off six inches above the bottom of this excavation and removed. During the sealing operation, the grout <br /> used to fill the well shall be allowed to spill over into the excavation and fill it for a thickness of one foot <br /> and form a cap which has a diameter of at least on foot greater than the diameter of the originally drilled <br /> hole. This procedure should result in the exposed edge of the casing being covered with six inches of <br /> grout. After the sealing operation and the sealing material have set, the excavation shall be back filled <br /> with clean native soil. <br /> Please contact me if you have any questions. <br /> Frank Girardi, Senior REHS <br /> 600 E. Main Street <br /> Stockton, CA 95202 <br /> (209)953-7868 (Office) <br /> (209)468-0341 (Fax) <br /> e-mail: fgirard,i@sjceh,d.com <br /> 5/30/2008 <br />