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Mr. Wes Johnson -2- 2 September 1999 <br /> 3. What is the depth of the deep landfill gas probe and what is the elevation of the sample in gas <br /> well GW-2 in comparison to the groundwater elevation at groundwater monitoring well MW-5? <br /> 4. Waste Discharge Requirements (WDRs) Order No. 94-259 and the associated Monitoring and <br /> Reporting Program(MRP)regulate groundwater monitoring for the Corral Hollow Sanitary <br /> Landfill. Monitoring wells MW-1, MW-2 and MW-3 are included in the MRP as required <br /> monitoring points for the deeper flow zone. These wells have been reported as dry since 1991 <br /> The shallow flow zone does not extend fully beneath the landfill; therefore the deeper now zone <br /> is the"first" aquifer that would be encountered beneath the southwestern half of the landfill. <br /> Additionally, contaminants within the shallow flow zone could be transported to the deeper flow <br /> zone if groundwater migrates from the shallow to the deeper zone. A workplan to install deeper <br /> groundwater monitoring wells to allow for detection monitoring of the deeper flow zone is due to <br /> this staff by 29 October 1999. <br /> If you have any questions regarding my comments please telephone me at (916) 255-3140. <br /> Wendy W. Arano <br /> Associate Engineering Geologist <br /> WWA <br /> CC. Robert Mc Clellon,R.E.H.S., Public Health Services, Environmental Health Division <br /> C:\mydocuments\sanjoaquin\corralhollow\gwpincmt <br />