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From: Macanas,John [mailto:JMacanas@CIWMB.ca.gov] <br /> Sent:Wednesday, November 10, 2004 9:00 AM <br /> To: Robert McClellon [EH]; Frank Girardi [EH];Ted Tasiopoulos [EH] <br /> Subject: FW: Sting Resistivity Survey for Landfill Delineation <br /> Robert and Frank, <br /> The email below is from Patrick Lehrmann,who is a principal for Southwest Geophysics, Inc. He had email this info to us <br /> as a matter of FYI.Anyway, I think in some cases a nonintrusive technique such as this for investigating a landfill might <br /> be effective assisting to determine what type of wastes might be present(see the fourth graphic depicted). Maybe this <br /> technique could be useful in investigating the World Enterprise Site to determine if something other than inert, C&D <br /> wastes are present. <br /> Maybe there are local companies that utilize this type of investigation. <br /> Mac <br /> CIWMB/CIA Section <br /> (916)341-6722 <br /> From: Patrick Lehrmann [mailto:plehrmann@southwestgeophysics.com] <br /> Sent:Thursday,September 16, 2004 5:12 PM <br /> To: Martinez-Centeno,Abel; Owen, Dawn; Macanas,John;Young, Glenn <br /> Subject:Sting Resistivity Survey for Landfill Delineation <br /> Hi Guys, <br /> Hans van de Vrugt and I just started our own geophysical firm called Southwest Geophysics. We are still working closely <br /> with Ninyo& Moore, however,this gives us the freedom to focus on strictly geophysics. I just wanted to let you know <br /> the news, and send you our latest technical email. <br /> Hope you are all doing well. Is Glen back in the States? <br /> Cheers, <br /> Patrick <br /> Recently,we were asked to conduct a high resolution resistivity survey to determine depth to bottom of fill and landfill <br /> areas at a huge Brownfield project in Arizona. Profiles were conducted at areas of suspected debris landfills and areas of <br /> uncompacted fills to compliment proposed environmental and geotechnical drill sites. The native formation at the site <br /> was an electrically resistive conglomerate. <br /> This profile was conducted as a baseline study,since historical records indicated that it had not been disturbed. As you <br /> can see,there is a fairly shallow layer of fill (five feet)over the more resistive native. <br /> This profile was conducted in an area of suspected buried trash. As you can see, large bull's-eye areas of high <br /> conductivity exist. These areas are interpreted to be metal and other conductive land fill debris and are up to depths of <br /> more than 16 meters. <br /> This profile was conducted along a river bank in an area where a cut bank was reportedly filled, but not compacted. As <br /> it turned out,the fill was more conductive then the native soil and the cut bank is easy to recognize. <br /> 2 <br />