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� - California Regional Water Quality Control Board Go,". <br /> ��W; Central Valley RegionKarl E. Longley,ScD,P.E.,Chair <br /> Linda S.Adams Arnold <br /> Secretaryfor 11020 Sun Center Drive N200,Rancho Cordova,California 95670-6114 Schwarzene <br /> Environments! Phone(916)464-3291 •FAX(916)464-4645 Governor g <br /> htip://www.waterboaTds.ca.gov/centralvalley _ <br /> Protection ' �\ <br /> OC-f 1 2008 <br /> 17 October 2008 ENVIR0Ni'-Y1'EN_` ISE 1��T <br /> Mr. Allan Fetters Mr. Bud denOuden <br /> RF Land, Inc. Ripon Farm Service, LLC <br /> 3705 Portsmouth Circle North PO Box 806 <br /> Stockton, CA 95219-3842 Ripon, CA 95366-0806 <br /> SITE CHARACTERIZATION WORK PLAN, RIPON FARM SERVICE, 938 FRONTAGE <br /> ROAD, RIPON, SAN JOAQUIN COUNTY <br /> Ripon Farm Service Inc. (also referred to as RF Land Inc.) has been a past operator of <br /> the retail fertilizer distribution facility at 938 Frontage Road, and Ripon Farm Service <br /> LLC is the current operator. Ripon Farm Service Inc. has provided a 12 September <br /> 2008 Site Characterization Work Plan, Phase // (Phase II Work Plan) prepared by <br /> Genesis Engineering & Redevelopment, LLC. In the Phase II Work Plan, Ripon Farm <br /> Service Inc. proposes 13 exploratory borings from which soil samples will be obtained <br /> every five feet from the surface to the water table, about 25 feet below ground surface <br /> (bgs). Five of these borings will be extended below the water surface and developed <br /> into monitoring wells. One of these borings, near the batch plant, with be extended to <br /> obtain depth discrete groundwater samples to a depth of about 200 feet and will be <br /> developed into a deep monitoring well. <br /> The proposed locations of the soil borings and groundwater monitoring wells are well <br /> situated to measure what impact, if any, operations at the site have contributed nitrate <br /> to soil and to shallow groundwater through the soil profile. Since the concrete-lined <br /> ponds and an associated sump located at the far eastern property boundary are also <br /> potential source areas for nitrate, one additional soil boring is needed in this vicinity. <br /> Please provide an updated Figure 3 showing the proposed location of this additional <br /> soil boring before commencing field work. The figure may be submitted electronically. <br /> Soil and groundwater samples are proposed to be analyzed for nitrate using EPA <br /> Method 300.1. Since microbial activity can transform ammonium to nitrate and vice <br /> versus, all soil and groundwater samples should also be analyzed for ammonium. <br /> The monitoring wells need to be sampled quarterly for nitrate and ammonium. <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />