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Californiegional Water Quality Co of Board <br /> Central Valley Region ' <br /> Katherine Hart, Chair <br /> 11020 Sun Center Drive,#200,Rancho Cordova,Cali fomia 95670-6114 <br /> Matthew Rodriquez (916)464-3291 •FAX(916)4644645 Edmund C.Brown Jr. <br /> Secretaryfor http://www.waterboards.ca.gov/centmlvalley Governor <br /> Environmental Protection <br /> RECEIVED <br /> E® <br /> 3 October 2011 T 0 4 ?.011 <br /> MENVIRONMENTALHEALTH <br /> Mr. Robert Jackson <br /> PERMITISERVICES <br /> Environmental Manager <br /> Crop Production Services, Inc. <br /> 3005 Rocky Mountain Ave. <br /> Loveland, Colorado 80538 <br /> REVIEW OF 2011 SOIL INVESTIGATION REPORT, CROP PRODUCTION SERVICES <br /> STOCKTON FACILITY, 1905 N. BROADWAY, SAN JOAQUIN COUNTY <br /> Staff of the California Regional Water Quality Control Board, Central Valley Region (Central <br /> Valley Water Board) have reviewed the 4 August 2011 2011 Soil Investigation Report, <br /> prepared by Rubik Environmental, Inc. for the agricultural chemical distribution facility at 1905 <br /> North Broadway Avenue in Stockton (Site). The distribution facility is the source of <br /> groundwater pollution containing primarily 1,2-dichloropropane (1,2-DCP), 1,2,3-trichloro- <br /> propane (1,2,3-TCP), and ammonium. In March 2011, Crop Production Services conducted <br /> an extensive on-site soil investigation to identify if on-site source areas were contributing to the <br /> groundwater pollution. <br /> Soil data was compiled from 47 soil borings, with six samples obtained from each boring from <br /> depths between 5 and 48 feet below ground surface (bgs). The data clearly shows that <br /> significant source areas of 1,2-DCP and 1,2,3-TCP exist beneath the former north pond, the <br /> north tank farm, and the south tank farm load area. These source areas extend vertically into <br /> the first water-bearing zone, which is found at about 45 feet bgs. While these contaminants <br /> were not found at significant concentrations at the former south pond, ammonium is present at <br /> high concentrations that extend into the water table at this pond and the former north pond. <br /> Ammonium is also present at high concentrations in shallow soils (above 20 feet bgs) at the <br /> north tank farm. <br /> The soil investigation also included analyzing 13 cone penetrometer borings to help delineate <br /> subsurface geology, 20 samples for soil physical properties, and three samples for <br /> contaminant leachability using the synthetic precipitation leaching procedure. <br /> The Soil Investigation Report identifies significant source areas that are on-going sources to <br /> groundwater pollution, and recommends developing a Remedial Action Plan to reduce <br /> pollutants in groundwater. Central Valley Water Board staff concur with the proposal. Please <br /> submit the Remedial Action Plan by 28 October 2011. <br /> California Environmental Protection Agency <br /> ea Recycled Paper <br />