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<br /> EDMVNDQ.BROWN JP.
<br /> GOYFPNOR
<br /> MATTHEW ODRIOUEZ
<br /> F
<br /> C A l I F 0 a N I• SECRETAPY OR
<br /> ENy1RONMENTAI.FPOTECTION
<br /> Water Boards
<br /> Central Valley Regional Water Quality Control Board
<br /> 30 September 2013
<br /> Mark Schell
<br /> Diamond Pet Food Processors of Ripon, LLC
<br /> P.O. Box 156
<br /> Meta, MO 65058
<br /> MONITORING WELL DESTRUCTION WORKPLAN APPROVAL, DIAMOND PET FOOD
<br /> PRODUCERS OF RIPON LLC AND RIPON COGENERATION LLC, SAN JOAQUIN
<br /> COUNTY
<br /> I have reviewed the Monitoring Well Destruction Work Plan, dated 26 April 2013. The
<br /> workplan was submitted on behalf of Diamond Pet Food Processors of Ripon, LLC (Diamond)
<br /> and Ripon Cogeneration, LLC (Cogen) by Lawrence & Associates (L&A). The workplan
<br /> proposes the abandonment and destruction of 16 existing groundwater monitoring wells
<br /> associated with the Diamond Pet Food facility in Ripon, California. The workplan was
<br /> submitted in accordance with Provision H.1.b of Waste Discharge Requirements (WDRs)
<br /> Order R5-2012-0105, which was adopted on 4 October 2012.
<br /> Attachment D of R5-2012-0105 provided a list of 29 monitoring wells that are no longer
<br /> needed for ongoing groundwater monitoring at the site. The workplan proposes to abandon
<br /> sixteen wells (OB-3, OB-6, OB-10, OB-12, OB-13, OB-14, OB-15, OB-16, OB-18, OB-20,
<br /> OB-27, TH-2, TH-3, TH-4, TH-5, and TH-6) from that list. However, the workplan specified
<br /> that twelve monitoring wells listed in Attachment D of R5-2012-0105 (MW-7-A, MW-7-B,
<br /> M-11-A, M-11-B, M-11-C, M-19-C, TH-1, TH-7, TH-8, TH-9, TH-10, and TH-11)will not be
<br /> decommissioned at this time. These twelve monitoring wells will not be decommissioned at
<br /> this time because they are currently included under a Monitoring and Reporting Program for
<br /> Order R5-2010-0810, which was issued by the Executive Officer on 15 April 2010 for a
<br /> neighboring facility operated by Nestle USA, Inc. (Nestle). Nestle currently operates a
<br /> groundwater treatment system to remediate contaminant plumes under the Central Valley
<br /> Water Quality Control Board's Site Assessment& Cleanup Program. Additionally, OB-19 will
<br /> not be abandoned because it is the only monitoring location of a semi-perched interval in the
<br /> middle of the northwest quadrant of the facility.
<br /> The workplan follows applicable well abandonment and sealing requirements outlined in two
<br /> California Department of Water Resources Water Well Standards (Bulletin 74-81, dated
<br /> December 1981, and Bulletin 74-90 dated June 1991), and San Joaquin County Well
<br /> Standards (Ordinance Code Section 9-1115.6), dated February 2005. Well sealing and
<br /> grouting procedures must follow San Joaquin County Environmental Health Department
<br /> permitting guidelines and effectively seal the shallow groundwater interval from deeper water-
<br /> bearing zones. All public street encroachment activities to abandon OB-27 must be
<br /> coordinated with the City of Ripon.
<br /> KARL E.LONGLEY SCO, P.E.,CHAIR 1 PAMELA C.CREEDON P.E.,BCEE,EXECUTIVE OFFICER
<br /> 11020 Sun Center Drlva#200.Rancho Cordova,CA 95870 1 WWW,WetwboarAa.ca.9ov/eentralvaOey
<br /> 0 mc,Y F.FAPFP
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