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URS Mr.Ross Atkinson May 15, 2007 Page 3 Work Plan To date,we have collected and analyzed two quarters of groundwater samples for general mineral (total dissolved solids)and metals. Following the first set of groundwater samples,the RWQCB identified eight constituents of concern.For the second set of groundwater samples,none of these samples was found to be above the reporting limit of the analyses for two of the eight constituents of concern: aluminum and lead.At a site located approximately 4 miles south of the World Enterprises site,Defense Distribution Depot San Joaquin California, Sharpe Site,the highest background arsenic concentration of 0.7640 milligrams per liter(mg/L) is over one order of magnitude greater than the highest arsenic concentration of 0.0358 mg/L found at the World Enterprises site.Based on the discussions in our meeting, it is our understanding that the RWQCB has the most concern with lead and arsenic.Because lead and arsenic do not appear to be an issue at the World Enterprises site,the implementation of a field investigation to assess the horizontal and vertical extent of groundwater impacts does not appear to be an urgent need. To date, four quarters of groundwater level data have been collected. Based on these data,during three of the four quarters,the groundwater flow direction was generally from the southwest to northeast. During the remaining quarter, September 2006,the groundwater flow direction was from the northeast to the southwest. Due to the variation in the groundwater flow direction during the past year, we would like to collect additional groundwater level data prior to selecting the location of additional groundwater monitoring wells. Site Groundwater Investigation Report We plan to submit a Site Groundwater Investigation Report following the field activities to investigate the horizontal and vertical extent of groundwater impacts. Groundwater Monitoring Plan We are currently required by SJCEHD to submit quarterly monitoring reports for the World Enterprises site.These reports summarize groundwater monitoring activities and presents the results of these activities during the quarter. These reports have been submitted to the RWQCB and we plan to continue to submit them until they are no longer required. Currently;these reports are submitted one month after the end of a quarter(e.g.,this coming quarter will end on June 30,2007;the quarterly report will be submitted by July 31,2007). SCHEDULE The following three subsections provide the proposed schedule to the RWQCB's three requirements identified in your February 20, 2007 letter. Work Plan We plan to submit a work plan to the RWQCB by November 15,2007. K:\Wprocess\25532\WorldEnterprise\Misc.Correspondence\051507.doc