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Joe Lentini • - 2 - • 5 March 2008 <br /> also be screened in the field (through visual or olfactory indications, sample vapor headspace <br /> monitoring, or other means) and additional soil samples selected for chemical analysis if <br /> screening indicates potential impacts. Furthermore, it should be noted that because of the <br /> discrete nature of the previously observed contaminant flow paths, a program of soil borings <br /> may not completely characterize the extent of remaining contamination since soil boring <br /> locations may not coincide with all preferential pathway locations. <br /> If you have any questions regarding this letter, you may contact me at (916) 464-4665 or <br /> ncasebeer@waterboards.ca.gov. <br /> )9t'-C <br /> / /� <br /> Nathan Casebeer, P.G. <br /> Engineering Geologist <br /> Private Sites Cleanup Unit <br /> cc: Mr. Ray Von Flue, San Joaquin County Environmental Health Department, Stockton <br /> Ms. Michelle Rogow, U.S. Environmental Protection Agency, San Francisco <br /> Mr. Jeff Gaarder, Conestoga-Rovers & Associates, Sonoma <br /> Ms. Deb Greenleaf, Shell Oil Products US, Carson <br /> Mr. Brian Hoffman, Granite Construction Company, Stockton <br /> NEC/W:\slic—dod\AustinStafRNathan\Shell Bird Rd.Pipeline Spill\2-22-08 Shell Hwy 580 Bird Rd Work Plan.doc <br />