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EDMDND G.8Powx Jx. <br /> �k. cOVENxOP <br /> ManP�r 1°nonlgUEz <br /> Water Boards <br /> Central Valley Regional Water Quality Control Board pp <br /> ECEIVED <br /> 12 September 2016 SEP 12 2016 <br /> ENVIRONMENTAL HEALTH <br /> Justin McManis PERMIRSEROCES <br /> 18700 East River Road <br /> Ripon, CA 95366 <br /> CONDITIONAL APPROVAL OF MONITORING WELL INSTALLATION WORK PLAN, <br /> MCMANIS FAMILY VINEYARDS, SAN JOAQUIN COUNTY <br /> I have reviewed the Monitoring Well Installation Work Plan (hereafter "Work Plan") prepared by <br /> Kennedy/Jenks Consultants for the McManis Family Vineyards (hereafter"Discharger"), dated <br /> 24 August 2016. The facility is permitted under existing Waste Discharge Requirements <br /> (WDRs) Order 5-00-021 which was adopted on 28 January 2000. New WDRs are currently <br /> being drafted to incorporate a proposed facility expansion, addition of a land application area <br /> (LAA), and upgrades to the wastewater treatment system. Groundwater monitoring wells are <br /> required around the new LAA to monitor potential impacts to groundwater from the application <br /> of wastewater. The Work Plan describes the procedures for well construction and development <br /> and presents the locations for three new groundwater monitoring wells. The proposed <br /> groundwater monitoring wells are necessary to: <br /> • Determine the pre-discharge groundwater quality beneath a proposed 16 acre LAA prior <br /> to the application of wastewater on the LAA; <br /> • Characterize the groundwater flow direction and conditions; and <br /> • Monitor potential impacts to shallow groundwater from the application of the facility's <br /> treated wastewater to the new LAA after the new WDRs are adopted. <br /> The Work Plan proposes installing three new groundwater monitoring wells around the <br /> perimeter of the 16 acre IAA. Based on the 2016 Report of Waste Discharge Addendum, dated <br /> 27 May 2016, data collected between 2001 and 2014 indicate a general groundwater flow <br /> direction ranging from west-northwest to south-southeast. Based on this data, two of the <br /> proposed wells will be located down gradient from the LAA and one well will be located <br /> upgradient. <br /> The Work plan adequately presents the procedures and well construction requirements in <br /> accordance with Requirements for Monitoring Well Installation Workplans and Monitoring Well <br /> Installation Reports (attached). However, there is some uncertainty in the proposed location of <br /> the upgradient well with respect to the current understanding of the groundwater flow direction. <br /> It appears the well should be located farther east, near the southeastern corner of the LAA to <br /> better characterize up-gradient background groundwater conditions. This issue was discussed <br /> in an email from Kennedy/Jenks Consultants, dated 2 September 2016, which explained that <br /> the proposed location of the upgradient well will be determined in the field by a geologist based <br /> on site conditions. The well should be located in an area that will not be affected by the <br /> operation of the existing agricultural well located along the southern boundary of the LAA and in <br /> KARL E. LoNaiEv SCD, P.E.,CHAIR I PAMELA C. CPEEDON P.E.,BCEE,E%ECUTIVE OFFICER <br /> 11020 Sun Centnr 01v0 0200.RancaO C°racva,CA 85870 www.wetartwarea.ca.gov/centralvallay <br /> 0 P crcu°noon <br />