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s Page 2 of 4 <br /> Justin, <br /> I'll take a look at the Lancaster data. Will let you know my findings. <br /> Grace <br /> From: Sobieraj, Justin J. [mailto:JUSTIN_J.SOBIERAJ@saic.com] <br /> Sent: Thursday, March 29, 2007 3:48 PM <br /> To: Chen, Grace (GRAQ <br /> Cc: Hurd, Michael T. <br /> Subject: CVX Mountain House #1 Analytical Results <br /> Grace, <br /> During April 2006, Lancaster analyzed groundwater samples collected from the CVX Mountain House <br /> Neighborhood #1 site. Five of the samples had extremely high TPHg and TPHd concentrations. A question has <br /> come up whether the results are accurate or may be a result of interference from TPHc. Can you please look at <br /> the chromatographs (see attached file)for the samples listed below to determine if the extremely high TPHd and <br /> TPHg results may be a result of interference from high concentrations of TPHc in the samples? The samples <br /> have been bookmarked in the PDF, which may make it easier to navigate around. <br /> Sample ID Lancaster Sample ID <br /> M H 1-1 4260718 <br /> M H 1-3 4258432 <br /> MH1-10 4261113 <br /> MH1-19 4258382 <br /> M H 1-24 4263934 <br /> 1 asked Lancaster to analyze the chromatograms (see below) and their response was slightly inconclusive. Please <br /> let me know if you have any questions or need additional information. <br /> Thanks, <br /> Justin Sobieraj <br /> Geologist <br /> SAIL <br /> 1000 Broadway, Suite 675 <br /> Oakland, CA 94607 <br /> Main: 510.433.0835 <br /> Direct: 510.466.7119 <br /> Fax: 510.446.7919 <br /> sobieraj@saic.com <br /> From: Teresa L. Cunningham [mailto:TCunningham@iancasterlabs.com] <br /> Sent: Monday, March 12, 2007 10:52 AM <br /> To: Sobieraj, Justin 1. <br /> Cc: Hurd, Michael T. ; Kathy Klinefelter <br /> Subject: FW: CVX Mountain House #1 Analytical Results <br /> Justin. <br /> As we discussed on Friday, Bob Brown, a principal chemist in our extractables department, reviewed the samples <br /> in question from Mountain House Neighborhood #1. . All samples have similar profiles. It is entirely possible that <br /> the product(s) present in these samples is crude oil (TPHc). The c-grams contain two distinct regions. The first <br /> elutes approximately from C8 through C20 and the second picks up right after that and continues beyond our <br /> acquisition (from C20 past C40). This broad elution range would be typical of crude oil; however, without having a <br /> reference of crude (and there are many different types of crude oil) on this system we cannot definitively state <br /> that the product present in the samples is indeed crude oil. It does appear that the two distinct regions are two <br /> file:/!N:\Chevron Sites and Projects\HPP Project Sites\\/Iounta.`.n 14nuse Site # 1 ��o recpon 5/150007 <br />