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Stantec <br /> Mr.Michael Infuma <br /> August 13,2009 <br /> Page 2 of 2 <br /> hydrated bentonite installed in six inch lifts to a depth of approximately 3 feet bgs.The remaining- <br /> annular <br /> emainingannular space will be backfilled with neat cement grout, and the top of the borehole will be secured <br /> with a flush-mounted vault box. <br /> The soil gas sample probes will be allowed to equilibrate for at least 48 hours before sample <br /> collection. Stantec anticipates leaving the soil gas sample probes for a period of approximately 6 to <br /> 8 weeks. Following collection of samples and receipt and review of chemical data,the soil gas <br /> sample probes will be abandoned by overdrilling to total depth of installation using 5.5-inch-," <br /> diameter hollow-stem augers. The boreholes will be backfilled with neat cement grout. <br /> If you have any questions or concerns regarding this.proposed scope of work, please contact me at <br /> (916)384-0722. <br /> Sincerely, <br /> Stantec Consulting Corporation <br /> NAL <br /> a� NEIL H: <br /> DORAN <br /> * No.8503 <br /> Neil Doran, P.G. <br /> Senior Geologist <br /> Attachments: Proposed Soil Boring and Soil Vapor Probe Locations, <br />