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Pagel of 2 r r Harlin Knoll [EH] From: Robert Ellgas [rellgas@msegrp.com] Sent: Thursday, May 28, 2009 6:23 PM To: Harlin Knoll [EH] Cc: Anne Conner; Tyrone Evans Subject: PG&E McDonald Island Well Decommissioning Attachments: PG&E McDonald Island RWQCB WDR Rescission Letter.pdf; PG&E McDonald Island 2008 Annual Report Table 2-1 Final.xls Harlin, Thank you for taking the time to speak with me today about the County's requirements for the subject project. This information will help MSE, on behalf of PG&E, to prepare the drillers' RFB and to assure that the work is done to County standards. As we discussed, I would appreciate you e-mailing me the link to the County's bulletin on well standards and the well decommissioning schematic you have prepared so that I can review these materials and provide them to the drillers as part of the RFB package. As I explained to you, RWQCB has rescinded the Waste Discharge Requirements for the site because Pond 3 was clean closed in 1994 and evaluation of 15 years of monitoring results indicates that the site soil and groundwater are no longer contaminated. Attached is the WDR rescission letter(sent to Robert McClellon of SJCEHD). Based on the site now being uncontaminated,we understand that the County will approve well decommissioning by pressure grouting rather than by overdrilling, with certain near surface completion features as we discussed and that will be shown on the schematic you provide to me. In addition,we discussed that you would perform a records search on several of the wells so that MSE can provide accurate information to the drillers for preparing bids. Because a number of the monitoring wells were installed as early as 1986 and several water supply wells were likely installed before then (possibly long before then), available records on the wells are limited. MSE would appreciate you attempting to locate records on the following wells for APN 12908009 (PG&E McDonald Island): • P-6A(surface riser was allegedly destroyed by a farmer in 1999; probably 2" PVC; could not be located during a recent site reconnaissance; attached Table 2-1 indicates the piezometer"was destroyed in 1999") • WP-1 (installed on Whiskey Slough embankment; 1.5" steel casing; could not be located during reconnaissance; construction details needed) • ZFD-1 (likely a water supply well into at least the third water-bearing zone; WLs never measured; appeared during reconnaissance to be part of a cluster of farm irrigation wells; likely not a PG&E well and might not be on APN 12908009) • TCD-1 (likely a water supply well into at least the third water-bearing zone; WLs measured from 4/94 through 5/95; no survey data nor other information; not found on any available site figures; might not be on APN 12908009) MSE will attempt to locate P-6A and WP-1 by clearing and scraping the surface around their approximate locations and looking for evidence of the wells. Assuming they are found, then the wells will be cleaned out before pressure grouting. ZFD-1 was not installed by PG&E and is likely owned by one of the farmers on the island; PG&E will attempt to confirm this. TCD-1 is not known to have been installed by PG&E, and considering its WL measurement period it is assumed to have been destroyed. Unless you find records indicating that TCD-1 still exists then no further action will be taken regarding this well. The remaining 24 wells that will be decommissioned were found during the reconnaissance and are shown on site figures. These wells are MW-1 RD, MW-2 through MW-11, P-1 A, P-1 B, P-2A, P-3A, P-313, P-4A, P-5A, PJA, and 5/29/2009