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w <br /> Mr. Paul Lambert - 3 - 26 November 2014 <br /> background value, the cleanup goal for nitrogen in groundwater is 45 mg/L nitrate as <br /> nitrate and 1.5 mg/L ammonium. <br /> In regards to reaching a remediation endpoint, Central Valley Water Board recognize <br /> that groundwater extraction has reached its effective endpoint when concentrations <br /> appear to be unchanging, but do not concur that unchanging concentrations represent <br /> the end of site remediation. Central Valley Water Board staff can recommend no further <br /> action for a site when the following have been achieved: <br /> • Soil source areas have been remediated and are not threatening surface or <br /> groundwater quality. <br /> • All affected water-bearing zones have been identified and addressed. <br /> • In the absence of active remediation, declining concentrations are observed in <br /> monitoring wells such that water quality objectives are expected to be met within a <br /> reasonable period of time. <br /> When these elements are met, Ripon Farm Service should prepare a Closure Report for <br /> Central Valley Water Board staff review. <br /> Conditional Concurrence <br /> Central Valley Water Board staff conditionally concur with the Extraction Work Plan <br /> provided Ripon Farm Service implement the following changes. <br /> • Groundwater remediation is considered complete water quality objectives will be met <br /> in a reasonable amount of time, or background concentrations are met, if background <br /> concentrations are greater than the water quality objectives. <br /> • Through the end of the equilibrium period, provide monthly data submittals including <br /> nitrate and ammonium concentrations, TDS, and flow rate from extraction wells, the <br /> blending tank, and the non-potable water supply input point. This data may be <br /> submitted electronically. <br /> • By 16 January 2015, provide an extraction well installation report. <br /> Central Valley Water Board staff applaud Ripon Farm Service and City of Ripon for <br /> working together to find suitable uses for the extracted groundwater. <br /> If you have any questions, you may contact me by telephone at (916) 464-4680 or by <br /> ema l at amy,�errell@waterboards.ca.gov. <br /> AMY TERRELL, P.E. <br /> Federal and Private Sites Cleanup Unit <br /> cc: Mr. Kevin Werner, City of Ripon, Ripon <br /> Mr. Nuel Henderson, San Joaquin County Environmental Health Dept., Stockton <br /> Mr. Dave Isola, Isola Law Group, Lodi <br />