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Eanuxc G.Bnowx J. <br /> ovenxar <br /> M "Ew ROORIOVES <br /> Water Boards oxMex,..Pxa,.[RR <br /> Central Valley Regional Water Quality Control Board <br /> 11 May 2017 RECEIVED <br /> Ted Wells R MAY 15 2017 <br /> Compliance Manager <br /> Sutter Home Winery, Inc. ENVIRONMENTAL HEALTH <br /> 18667 Jacob Brack Road PERMITISERVICES <br /> Lodi, Ca 95242 <br /> REVIEW OF TECHNICAL REPORT, GROUNDWATER QUALITY AT MONITORING WELLS <br /> GW-1 AND GW-21, SUTTER HOME WINERY, SAN JOAQUIN COUNTY <br /> The discharge of waste from the Sutter Home Winery in Lodi is regulated by Waste Discharge <br /> Requirements Order R5-2015-0085. Sutter Home Winery (Discharger) owns the facility and the <br /> land application areas. <br /> Regional Board staff has reviewed the 27 April 2017, technical report titled, "Groundwater Quality <br /> at Monitoring Wells GW-1 and GW-21". The report was submitted in accordance with Monitoring <br /> and Reporting Program (MRP) R5-2015-0085, which requires the Discharger to submit a technical <br /> evaluation of the reasons for the concentration increase of Nitrate as Nitrogen in the facility's <br /> groundwater compliance monitoring wells. <br /> During 2016 the Discharger reported that the concentration of Nitrate as Nitrogen exceeded the <br /> trigger concentration of 8 milligrams per liter (mg/1) in Groundwater Monitoring Wells GW-1 and <br /> GW-21, as shown in the table below, <br /> Sample Date GW-1 Nitrate Concentration GW-21 Nitrate Concentration <br /> (m /I) (m /I <br /> 2-23-16 8.3 13 <br /> 5-17-16 33 15 <br /> 8-30-16 34 14 <br /> 11-29-16 39 14 <br /> The report concludes that the increase in nitrate observed in well GW-1 is not due to the <br /> Discharger's land application of wastewater, as evidenced by low nitrate concentrations (3 mg/1) in <br /> nearby monitoring well GW-26. Rather the nitrate increase in GW-1 is due to off-site influences, <br /> which include a nearby dairy, poultry farm, domestic leach field and irrigation canal. <br /> The Discharger contends that the nitrate concentrations observed in well GW-21 are similar to pre- <br /> discharge concentrations and the fluctuations in water quality observed in the well are due to the <br /> influence of the unlined irrigation ditch adjacent to the well. The Discharger recommends ongoing <br /> monitoring during 2017 to further evaluate water quality trends. <br /> KARL E. Lo.CLEv SCD, P.E., CHAIR I PAMELA C. CREEDON P.E., BCEE, E%EOOTIVr orrlarn <br /> 11020 San Canter Drive 0200,Renclro Cordova,CA 95670 1www.weteiboartls.ca.gov/cenhalvaYey <br /> �)neCYCL[D PPP[P <br />