Laserfiche WebLink
EOMUNO G.BROWN JR. <br /> GOVERN OR <br /> G!L I P O R N l e METARY FORORIOUEZ <br /> WaterBoards ENVIRONMENTAL PROTECTIOA <br /> Central Valley Regional Water Quality Control Board <br /> I <br /> 7 April 2017 <br /> Mr. Brian Duggan <br /> Environmental Manager <br /> Crop Production Services, Inc. <br /> 3005 Rocky Mountain Ave. <br /> Loveland, Colorado 80538-9001 <br /> CONCEPTUAL CONCURRENCE WITH PILOT TEST WORKPLAN, MONITORING WELL <br /> INSTALLATION, AND MONITORING WELL DESTRUCTION, CROP PRODUCTION <br /> SERVICES STOCKTON, 1905 N. BROADWAYAVE., STOCKTON, SAN JOAQUIN COUNTY <br /> Crop Production Services (CPS) is monitoring the groundwater effects that appear to be <br /> originating from a former disposal pond operated by its predecessor at the 1905 North <br /> Broadway facility in Stockton. CPS is proposing an interim groundwater remediation as <br /> described in the 5 April 2017 Pilot Test Work Plan prepared by its consultant, Rubik <br /> Environmental. Th remediation plan proposes to treat nitrate, ammonium, 1,2,3-trichloro- <br /> propane, 1,2-dichloropropane, 2,3-dibromo-3-chloropropane, and ethylene dibromide in the first- <br /> encountered groundwater zone (A-zone) adjacent to the former north pond and at the south <br /> tank farm load pad. California Regional Water Quality Control Board, Central Valley Region <br /> (Central Valley Water Board) staff have reviewed the Pilot Test Work Plan, which includes a <br /> well installation plan and a well destruction plan for monitoring wells that are no longer serving a <br /> monitoring purpose. <br /> Because the density of pollutants is greatest in the soil beneath the former north pond, in the <br /> j A-zone groundwater beneath the former north pond, and at the south tank farm load pad, <br /> Central Valley Water Board staff conceptually concur with CPS regarding the proposed pilot test <br /> injections beneath the former pond and load pad. <br /> i <br /> Pilot Test Work Plan <br /> CPS proposes to inject two compounds into 12 injection points at the former north pond, and <br /> into 5 points at the load pad of the south tank farm. All injections will target the A-zone, <br /> between about 45 and 65 feet below ground surface (bgs). One injectant is 3-D Microemulsion <br /> (3DME), which contains time-release organic acids that serve as electron donors to promote <br /> anaerobic biological degradation of the contaminants. The other injectant is Chemical Reducing <br /> Solution (CRS), which provides ferrous iron. The ferrous iron forms reduced iron sulfides and <br /> iron oxyhydroxides that can abiotically destroy chlorinated organic pollutants. <br /> KARL E. LONGLEV SCD, P.E.,CHAIR I PAMELA C. CREEDON P.E., BCEE, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200,Rancho Cordova,CA 95570 1 www.waterboards.ca.gov/centralval lay <br /> ea Ht CYCLeu PA <br />