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1 <br /> ARCADIS Brian Taylor, P.G. <br /> February 2, 2009 <br /> 1 <br /> Data Evaluation <br /> The analytical results from all three passive sampling techniques will be compared <br /> using a 95% upper confidence limit(UCL[a=0.05=5%])to the analytical results <br /> from the standard sampling technique(e.g. purge 3 well volumes then sample <br /> collection)on a well by well basis. If approved by the RWQCB the evaluation will be <br /> 1 conducted during the second quarter 2009 with results and recommendations <br /> presented within the second quarter 2009 groundwater monitoring report. <br /> 1 Comment#3 <br /> By 2 February 2009, Chevron needs to submit an explanation detailing why DO <br /> 1 sampling at perimeter monitoring wells was not performed as requested by <br /> Regional Water Board staff. By 1 May 2009, Chevron must submit results of the <br /> requested DO sampling. <br /> Perimeter monitoring wells were installed during the fourth quarter 2008(October 1 <br /> and December 8, 2008),therefore, could not be sampled during the third quarter <br /> 1 2008 monitoring and sampling event. Dissolved oxygen(DO) results for perimeter <br /> wells were submitted within ARCADIS Fourth Quarter/Annual 2009 Groundwater <br /> Monitoring Report, dated January 30, 2009. <br /> 1 If you have any questions or comments regarding the contents of this letter, please <br /> contact either David Lay at 315.671.9197 or by e-mail at David.Lay@arcadis-us.com <br /> or David Evans at 916.985.2079 ext. 12 or by e-mail at David.Evans@arcadis- <br /> us.com. <br /> Sincerely, <br /> 1O c <br /> ARCADIS �---�i (� a DAVID LAY <br /> No.8545 ' <br /> 1 <br /> David . Evans David al Lay, C.P.G. 9� <br /> Senior roject Manager Principal Geologist OFCAt t <br /> 1 Enclosures: <br /> Attachment 1 Construction Drawings <br /> 1 Attachment 2 Implementation Schedule <br /> 1 <br /> 1 Page: <br /> 4/5 <br /> INrobwb�YL4amen�oGlk''M1CY£N10A11 W I fitM bFadln\WVI P W eY1M fiTPbmntlUPnNM limkrtanu9m flepon_]]9310350 Ox <br /> 1 <br />