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N • • h <br /> EDMVNO B. BROWN JR. <br /> .j, OVPRNOR <br /> 11iDR N11 MATTHEW ROORIDUEZ <br /> rCAETARYAOA <br /> Water Boards ENVIRONMENTAL PROTECT..l <br /> Central Valley Regional Water Quality Control Board <br /> 26 February 2016 <br /> Ms. Beverly Garcia <br /> Raymond Investments <br /> 817 South Center Street <br /> Stockton, CA 95206 <br /> APPROVAL OF THE SITE INVESTIGATION WORK PLAN, FORMER HELENA CHEMICAL <br /> FACILITY, 2245 WEST CHARTER WAY, STOCKTON, SAN JOAQUIN COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board (Central Valley Water Board) <br /> have reviewed the December 2015 Site Investigation Work Plan-Second Revision, Former <br /> Helena Chemical Facility, 2245 West Charter Way, Stockton, California (Work Plan), submitted <br /> on your behalf by Condor Earth Technologies, Inc. (Condor) on 3 February 2016. The Work <br /> Plan was revised to address our 10 September 2015 review comments. <br /> Previous site activities associated with the storage and distribution of agricultural supplies <br /> (chemicals, fertilizers, and pesticides) resulted in the release of contaminants, including Total <br /> Kjeldahl Nitrogen (TKN), ammonia, and nitrate, to soil and groundwater. The Work Plan is being <br /> submitted to describe activities proposed to characterize soil and groundwater at the site for <br /> TKN, ammonia, nitrate, pesticides, petroleum hydrocarbons, and LUFT 5 heavy metals, and to <br /> delineate the extent of impacted soil and groundwater. The Work Plan proposes to advance 14 <br /> soil borings to collect soil and groundwater samples for laboratory analysis and to install three <br /> groundwater monitoring wells. In addition, a soil/stormwater sample will be collected from the <br /> stormwater retention basin located on the southeast portion of the site and analyzed for TKN, <br /> ammonia, nitrate, pesticides, and LUFT 5 heavy metals. The Work Plan also proposes to collect <br /> soil from one boring for analysis of hydraulic conductivity. <br /> The Work Plan is acceptable to Central Valley Water Board staff. You may proceed with <br /> scheduling the field investigations. Please notify this office at least 48 hours prior to initiation of <br /> field activities in the event that staff elect to be present to observe the work. <br /> The site investigation report should be submitted to this office no later than 1 August 2016. <br /> The report should be prepared in general accordance with Items to be Included in a Site <br /> Assessment Report, which is attached for your reference. <br /> KARL E. LONOLEV SCD, P.E., CHAIR I PAMELA C. CREEOON P.E., BCEE, EXECUTIVE OFFICER <br /> 11020 Sun Center ONVe#200,Rancho COrdOVa.CA 95570 1 www.waterooaros.ca.goVtcentralValley <br /> �^p x crc Leu vIVLR <br /> P�csrac-a-xTmmr*..rvc..eas rcm_. . _ _.- <br />