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URS <br /> Mr. Ross Atkinson <br /> Regional Water Quality Control Board—Central Valley Region <br /> May 20, 2011 Page 9 of 10 <br /> public by community water systems. Although barium was found to be above the MCL, it was not found <br /> to be above the MCL down-gradient of the former landfill and the barium results found within the <br /> down-gradient well were relatively consistent, indicating that the barium plume is likely limited to the <br /> former landfill area and the results support that this plume is not increasing. Although barium within the <br /> former landfill is above the MCL,should the groundwater from the site be utilized for drinking water, <br /> treatment is needed before it can be supplied to the public by community water systems.Nickel <br /> concentrations were the highest within the former landfill.The highest nickel concentration of <br /> 0.0236 mg/L was approximately one quarter of the MCL of 0.1 mg/L. URS recommends no further <br /> action at this site based on the above conclusions, and request your concurrence of site closure. <br /> REFERENCES <br /> California Regional Water Quality Control Board—Central Valley Region, 2009. The Water Quality <br /> Control Plan(Basin Plan), Fourth Edition. September. <br /> Radian International,LLC, 1997. Defense Distribution Region West Sharpe Annual Progress Report: <br /> January 1996 through December 1996. April. <br /> Saracino-Kirby, Inc. 2000. Arsenic Occurrence and Conjunctive Management in California. September. <br /> URS Corporation Americas(URS), 2006a. Groundwater Monitoring Well Installation Report and <br /> Quarterly Monitoring Report for World Enterprises Site, Second Quarter 2006. July. <br /> URS, 2006b. Passive Soil Vapor Extraction Trench Installation Report and Quarterly Monitoring Report <br /> for World Enterprises Site, Third Quarter 2006. October. <br /> URS, 2007a. Quarterly Monitoring Report and Tank Removal Report for World Enterprises Site,Fourth <br /> Quarter 2006. January. <br /> URS, 2007b. Quarterly Monitoring Report for World Enterprises Site,First Quarter 2007. April. <br /> URS, 2007c. Quarterly Monitoring Report for World Enterprises Site, Second Quarter 2007. July. <br /> URS, 2007d. Quarterly Monitoring Report for World Enterprises Site, Third Quarter 2007. October. <br /> URS, 2008a. Quarterly Monitoring Report for World Enterprises Site,Fourth Quarter 2007. January. <br /> URS, 2008b. Quarterly Monitoring Report for World Enterprises Site, First Quarter 2008. April. <br /> URS, 2008c. Quarterly Monitoring Report for World Enterprises Site, Second Quarter 2008. July. <br /> URS, 2008d. Quarterly Monitoring Report for World Enterprises Site, Third Quarter 2008. October. <br /> URS, 2009a. Quarterly Monitoring Report for World Enterprises Site, Fourth Quarter 2008. January. <br /> URS, 2009b.Quarterly Monitoring Report for World Enterprises Site,First Quarter 2009. April. <br /> H:\Wprocess\25532\WorldEnterprise\Closure\0520(1.doc <br />