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• MS To: Mr. Jarel Starling, CEHNC-IS-FS MEMORANDUM From: Dick Van Dyke, URS Group, Inc.ffl U r Copy: Steve Nohrstedt, CEHNC Morgan Ruther(CEHNC) l John Guzman, DDJC-FA 'IT 1 0 2001 Marcus Pierce, RWQCB Harlin Knoll, San Joaquin County L�VII't' +' =?u j h ALTh Graham Sharpe, URS Group, Inc. pl" vil!''SE,RVICET S Project File (602238) Date: 10 October 2001 Subject: Responses to Regulatory Comments, DDJC-Sharpe SHAD Well 2 Abandonment Work Plan and Downhole Video (Contract No. DACiA87-95- D-0001/1`0038-038) The purpose of this memorandum is to respond to comments received in December 1999 on the Final Well 2 Abandonment Work Plan (dated 9 September 1999) and the 20 October 1999 . submission of the downhole well video from Marcus Pierce of the Regional Water Quality Control Board (RWQCB) and Harlin Knoll of the San Joaquin County Environmental Health Division (SJCEHD). Since that time, the effort to implement the abandonment of Sharpe Army Depot (SHAD)Well 2 has been suspended due to funding limitations. Because a contract modificatioi to complete this effort was recently finalized, we are now following up with responses to those comments. The tentative schedule for completion of the abandonment is in late 2001. Copies of the work plan and video submittal memorandum are attached to this memorandum for reference. Comments received from Marcus Pierce [followed by responses] are as follows: • RWQCB Comment#1: How did you come up with the perforated intervals? These interval do not span the entire coarse sand intervals noted on the well log. Your October 20, 1999 mem suggests that you determined these intervals from the video,but I found the casing very diff cult to see below a depth of about 60 feet because of all the scale and floating debris. [Perforate intervals were identified by the Layne Christiansen field supervisor during the recording of rhe downhole video in October 1999.1 • RWQCB Comment#2: There was no map provided with the work plan, so where is SHAD Well 2 located? Is this well actually PW-039 as the Water Management Report indicates? If not, fer me to a figure in our files that shows the location. [SHAD Well 2 is not PW-039, as shown ir, the Water Management Report, but is located approximately 600 feet southwest of PW-039 near the south edge of the North Balloon; a map showing the well location has been included with this memorandum.] • RWQCB Comment#3: The Work Plan does not specify how long you will maintain pressure on the grout to allow the cement mixture to set in the filter pack/formation outside the well scre n (see DWR Bulletin 74-81, Page 56, Item#6). [As stated in DWR Bulletin 74-81, "pressure shall be maintained for a length of time sufficient for the cementing mixture to set." For a specify