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RPR-21-1595 15: 13 M3NTGOMERY IMTSON 510 975 3412 P.01iO4 Alike MOMTGOME tY VIATSON 365 Lennon Lane �1W Walnut Creek,California 94598 Tel: (510)975-3400 Date: April 21, 1995 Fax: (510)975-3412 To: Steve Light Fax No: 205/895-1602 CEHND From: Nancy Barnes Reference: 1587.1579 Subject: Well Abandonment No.of Pages: ?� AG-3 (including cover) Dear Steve: This letter is to confirm the abandonment and demolition task which will be undertaken at well AG-3 at DDRW-Tracy,California. The abandonment methods were discussed with the regulatory agencies at the November 30, 1994,RPM meeting. Because of observations made during a recent site visit with Layne-Western Company,some revisions to the original procedures have been recommended. Well AG-3 Our original recommendations for abandonment of AG-3,initially outlined in our memo to you dated September 30, 1994,and revised based on regulatory comments are summarized below: 1. Attempt to spear the column pipe using a modified fishing tool near the top of the bowls to pull it loose. As discussed previously,the column pipe is currently broken off at about 30 feet bgs. H the attempt to pull it loose is not successful,we will cut off the column pipe at the top of the pump bowls and remove the column pipe from the well. Sections of the column pipe would be disposed as clean metal waste. 2. If the pump does not drop within the casing to a depth greater than 300 feet bgs,we will use a milling bit to clear the bowls from the casing. The condition of the well can be assessed using the video camera as described in the work plan if the well is clear below the bowls. Following discussions with the abandonment subcontractor,Layne-Western Company,during mobilization for the current effort,the site supervisor believes that additional pulling/fishing would not be effective since a significant length of the bawls and column pipe wem sand-locked in place;otherwise previous pulling attempts would have been effective. It was therefore decided that we would attempt to determine the depth of the sand-lock before proceeding further.