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E.. G. Baowry Jn. <br /> ...massa flEcENE® MC EPAr oo°amoez <br /> Water Boards I.VI.ONMEHT1 <br /> Ute <br /> Central Valley Regional Water Quality Control Board <br /> ENVPERMITISEMl CELTH <br /> HEALT" <br /> 9 December 2013 <br /> Mr. Robert C. Brod <br /> One John Deere Place <br /> John Deere Landscapes <br /> Moline, IL 61265-8010 <br /> REVIEW OF SEPTEMBER 2013 GROUNDWATER MONITORING REPORT, FORMER <br /> LESCO FACILITY, 2829 W. WASHINGTON BLVD., STOCKTON, SAN JOAQUIN <br /> COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Central Valley <br /> Water Board) reviewed the 18 September 2013 Groundwater Monitoring Report (Monitoring <br /> Report) prepared by ERM for John Deere Landscapes, Inc. In 2007, John Deere <br /> Landscapes purchased the former fertilizer manufacturing and distribution facility site at <br /> 2829 and 2835 West Washington Blvd, which has been operated by Tri-Delta Fertilizers, <br /> and then as Lesco Inc. John Deere demolished most of the structures in 2010, excavated <br /> and removed about 10,800 tons of soil that contained nitrate and ammonium in 2011, and <br /> conducted three quarters of groundwater monitoring in 2012 and 2013. The results of the <br /> groundwater monitoring is presented in the Monitoring Report. <br /> During the soil excavation work, monitoring well MW-1 was destroyed, and the remaining <br /> three monitoring wells, MW-2, MW-3, and MW-4, are currently used to establish a . <br /> groundwater gradient. Since the destruction of MW-1, the gradient appears to be <br /> consistently southeasterly. However, when MW-1 was also used to gauge gradient <br /> direction, the gradient has been mapped to the south, east, northeast and southwest. <br /> Therefore, the appearance of a stable gradient direction does not correlate with the <br /> historical gradient directions. <br /> The post-excavation groundwater monitoring data shows mixed results. One year after <br /> excavation, the northernmost well, MW-2, showed a dramatic decline in nitrate, but in the <br /> next two quarters the concentration increased to about 200 mg/I (NO3-N) which is greater <br /> than pre-excavation concentrations. One year after excavation, the well that is about 120 <br /> feet south of the excavation increased in nitrate concentrations above pre-excavation <br /> conditions, and has gradually declined to be about equal with pre-excavation <br /> concentrations. Nitrate concentration has not changed significantly in MW-4, which is about <br /> 10 feet south of the excavation. MW-4 also contains arsenic, vanadium, and sulfate, which <br /> remain within the historical range of observed concentrations. <br /> KARL E. LONGLEY SCD, P.E., CHAIR I PAMELA C. CREEDON P.E., BCEE, EXECUTIVE OFFICER <br /> 11020 Sun Canter Drive#200,Rancho Cordova.CA 95670 I www,waterboard$.ca.gov/contralvaligy <br /> E�MktYGIIY Y.kYIX <br />