Laserfiche WebLink
Corral Hollow Sanitary Landfill Ugration Monitoring Wells Page 2 of 6 <br /> Voice: 209-468-8504 <br /> Fax: 209-468-3078 <br /> -----Original Message----- <br /> From: Robert McClellon [EH] [mailto:RMcClellon@sjcehd.com] <br /> Sent: Wednesday, March 28, 2007 8:37 AM <br /> To: Natalia Subbotnikova [EH] <br /> Cc: Michael Carroll <br /> Subject: FW: Corral Hollow Sanitary Landfill inspection <br /> FYI <br /> -----Original Message----- <br /> From: Todd Del Frate [mailto:TDelFrate@waterboards.ca.gov] <br /> Sent: Wednesday, March 28, 2007 8:01 AM <br /> To: GYekta@CIWMB.ca.gov; Robert McClellon [EH] <br /> Cc: mwochnic@CIWMB.ca.gov; Todd Del Frate; Victor Izzo <br /> Subject: RE: Corral Hollow Sanitary Landfill inspection <br /> Gino and others, I am concerned that the CHSL has larger LFG issues than what is <br /> being discussed in the quarterly reports. I required SJC to move from corrective <br /> action into an evaluation monitoring program that will encompass additional wells <br /> in the vicinity of GW-2 and GW-6 along with a boring program to delineate LFG <br /> northwest, northeast, and southeast of the CHSL. SJC has submitted a plan, but <br /> was required to amend the plan to investigate further. <br /> I am concerned about plugged probes and lack of readings presented in the reports. <br /> Apparently, there are several probes plugged with water, GW-1 and GW-2 that are <br /> known for sure. The reports SJC submits to the board does not include field data <br /> sheets for monitoring of gas wells, so I am not sure what SCS is doing. I am <br /> concerned that other probes could have water in them and whether or not groundwater <br /> has risen into the waste. Do we know what the probe depths are relative to the <br /> extraction wells? If similar can we assume the extraction wells located in the <br /> northeast portion of the landfill might have water in them, hence water in the <br /> waste? Are the probes open to the atmosphere and can DTW be checked? If not,how <br /> do we know water is in the probe? I have not recommended this yet, but any probes <br /> with water west of the northeast boundary where GW-1 is located be left in place <br /> and that DTW measurements and groundwater samples be collected from them. Until <br /> additonal GW wells are installed I would like to have those points for backup. <br /> As far as the phase II plan SJC has proposed, I have made several recommendations <br /> to further investigate the areas of concern and extend the cover where needed. We <br /> will make a final detemination of the performed activities following completion. <br /> Gino, the May lst 2007 timeline is OK with me to fix the ponding issues. <br /> Todd A. Del Frate P.G. <br /> Engineering Geologist <br /> 3/28/2007 <br />