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Ms. Amy Terrell <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> August 13, 2007 <br /> Page 3 <br /> technology used in the first phase of groundwater sampling and therefore are contemplating <br /> using other drilling methods. <br /> Based on the groundwater data collected under Tasks 1 and 2,we also plan to collect soil vapor <br /> samples from beneath the site for analysis of VOCs. The soil vapor results will be used to <br /> further define the potential source(s) and transport pathway(s) for VOCs at the site. <br /> REVISED SCHEDULE <br /> The expansion of the scope of this investigation will necessitate revisions to the estimated <br /> schedule presented in the June 2007 email to Ms. Montgomery due to the time it will take to <br /> obtain the permits for the additional sampling locations. Also, contractor availability will dictate <br /> when we can do the work. <br /> The revised schedule is as follows: <br /> Task 1 —Groundwater Sampling from the Existing On-Site Wells: Completed <br /> Task 2 (Expanded)—Downgradient Groundwater and On-Site Soil Vapor Sampling: by <br /> November 15, 2007 <br /> Task 3 —Additional Monitoring Well Installation: by November 15, 2007 <br /> Task 4—Evaluation of Potential Sources: by November 15, 2007 <br /> Task 5 —Quarterly Groundwater Monitoring(four quarters, includes newly installed <br /> wells): by November 15, 2007; January 30, 2008; April 30, 2008; and July 31, <br /> 2008 <br /> Task 6—Groundwater Investigation Report: by December 31, 2007 <br /> Task 7—Groundwater Monitoring Reports: by December 31, 2007 (included with the <br /> groundwater investigation report); March 31, 2008; June 30,2008; and <br /> September 30, 2008 <br /> CADocuments and Settings\minfutna\Local SettingsUemporary Internet Fi1es\0LKI\13290-04.doc <br />