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• Page 1 of 2 • Frank Girardi [EH] From: Roger.Lucich@CH2M.com Sent: Monday, June 02, 2008 1:34 PM To: Frank Girardi [EH] Subject: RE: Cook Road destruction of deeper wells N-21, N-22,& N-23 Importance: High Attachments: Holt—Work_Plan_Addendum.pdf; final_revised_Well_destruction permit_appl_barber_prop_6- 2-08.pdf Hi Frank; Attached you will find a new well destruction permit application for wells N-21, N-22, and N-23 for the Whiskey Slough Road property, Holt, California. I will be submitting payment when I complete this e-mail. Thank you for your help and I look forward to hearing from you regarding this project. Thanks, Roger From: Frank Girardi [EH] [mailto:fgirardi@sjcehd.com] Sent: Friday, May 30, 2008 5:33 PM To: Lucich, Roger/BAO Cc: Margaret Lagorio [EH] Subject: Cook Road destruction of deeper wells N-21, N-22,& N-23 Roger, In follow up to our conversation, EHD requests that you submit a work plan (w/engineer stamp and signature)to describe that the pressure grouting method to destroy the deeper wells N-21, N-22, and N-23 will not cause a cross contamination problem now or in the future with Regional Board approval. Also, the WP should also describe the procedure for the well destruction to be in compliance with the SJC code. The pressure grouting shall be done by excavating a hole at least 1' larger than the diameter of the originally drilled hole to a depth of a min. of 3' bsg (this shall include the conductor casing). Then cut the conductor casing and PVC casing 6"from the bottom of the hole. Then pressure grout and allow the grout to cap/spill over 1' greater than the diameter of the casing. The exposed casing shall be covered with at least 6"of grout and backfilled with native soil. The wording for the SJC code for pressure grouting is noted below: For the protection of the seal, and to facilitate the future use of the land site, a hole at least one foot larger in diameter than the originally drilled hole shall be excavated around the outside of the well casing to a depth not less than three feet below the ground surface. The well casing shall then be cut off six inches above the bottom of this excavation and removed. During the sealing operation, the grout used to fill the well shall be allowed to spill over into the excavation and fill it for a thickness of one foot and form a cap which has a diameter of at least on foot greater than the diameter of the originally drilled hole. This procedure should result in the exposed edge of the casing being covered with six inches of grout. After the sealing operation and the sealing material have set, the excavation shall be back filled with clean native soil. Please contact me if you have any questions. 6/3/2008