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Mr. Jeffrey D. Wingfield - 3 - � 29 July 2011 <br /> Port of Stockton California <br /> Port in 2007 and 2008. Central Valley Water Board staff believes that the concentration of <br /> arsenic in this well is the result of leaching from Site 47 soil. Also, it is possible that the <br /> increasing concentration trend in Monitoring Well W280 is the result of the soil disturbance <br /> created by the recent roadway relocation project. <br /> Response #4: The Port must monitor and sample Monitoring Well W280 on a quarterly basis, <br /> beginning with the third quarter of 2011. <br /> Comment #5: The Port has not conducted routine monitoring, sampling, and reporting on <br /> Site 47 monitoring wells. Furthermore, the Port has not developed a groundwater monitoring <br /> plan for Site 47. <br /> Response #5: The Port must propose a Groundwater Monitoring and Sampling Plan for <br /> Site 47 in the Final RI. All existing and new Site 47 monitoring wells required in this letter must <br /> be proposed in the plan and initially monitored and sampled on a quarterly basis. Also, <br /> quarterly reporting of results must be included in the plan. <br /> The Port can submit the Final RI as soon as possible, provided the Final RI includes the <br /> Groundwater Monitoring and Sampling Plan and other work outlined in this letter, and provided <br /> it addresses issues presented by DTSC. <br /> If you have any questions, please contact me at (916) 464-4675, or by email at <br /> brownell@waterboards.ca.gov. <br /> ?JIMES4R. BROWNELL, P.G. <br /> Engineering Geologist <br /> Federal Facilities Unit <br /> cc: Jose Salcedo, Department of Toxic Substances Control, Sacramento <br /> Harlin Knoll, San Joaquin Environmental Health Department, Stockton <br /> Mark O'Brien, Environmental Risk Services Corporation, Walnut Creek <br />