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Corral Hollow Sanitary Landfill 'gration Monitoring Wells Page 5 of 6 <br /> W 0 <br /> I have a few questions regarding this site and maybe you can help. <br /> 1. The probes at all of our sites seem to produce a sample with <br /> different efficiencies (some are slow producers and others seem to be <br /> fine) . Is there a standard for what constitutes a plugged probe? Is <br /> there an approved methodology for determining this? <br /> 2. The sampling of the entire site is being done quarterly by SCS, is it <br /> necessary as part of our inspection to sample all the probes quarterly, <br /> or just the probes that have been a problem in the past? If you would <br /> like the EHD to sample all of the probe then we will make it a part of <br /> the quarterly. Please let me know. <br /> 3. Have you had a chance to review Public Works last proposal to <br /> determine the extent of the waste outside of the closure cap? <br /> 4. Probe #1 Deep as you know the screened interval is submersed in H2O. <br /> This probe will require relocation. There are two options regarding <br /> this. One install the probe in the closest location near the original <br /> location that is not subject to the perched water. Or two raise the <br /> screened interval to just above the perched water. <br /> Please let me know what you are thinking regarding the sampling. Thanks <br /> 1 Robert <br /> t Robert D. McClellon, Program Coordinator, REHS San Joaquin County <br /> I Environmental Health Department <br /> 304 E. Weber Ave, Third Floor <br /> Stockton, CA 95202 <br /> (209) 468-0332 <br /> -----Original Message----- <br /> 3/28/2007 <br />