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r. Starrlbec <br /> September 29,2009_ <br /> Page 3 of 3 <br /> Reference: Well Permit Application Packet <br /> centered within a one-foot thick sand filter pack. The filter back will be followed by one-foot <br /> unhydrated Volclay bentonite, then sealed to the next interval or to the surface using hydrated Voiclay <br /> bentonite. A one-foot section of six-inch-diameter schedule 40 PVC casing will be installed within a <br /> concrete seal at the surface to allow for subsequent use of a `small shroud' vapor sampling system. <br /> The soil vapor probes will be covered with flush-mounted well box.-- <br /> Soil <br /> ox.-Soil gas samples will be collected using the shut-in test and helium leak testing methods recently <br /> promulgated as `best practices' by California EPA Soil gas samples will be.analyzed for VOCs and <br /> naphthalene using EPA Method TO-15, and for naphthalene using EPA Method TO-17. Following <br /> sample collection, the soil gas probes will be left in place in case additional soil gas samples may <br /> be needed. Once it is determined that no additonal soil gas samples are needed, Stantec will <br /> submit the necessary well destruction permits and destroy the vapor points in accordance to .San <br /> Joaquin Environmental Health Department requirements. <br /> If you have any questions or concerns regarding this permit application package, please feel free to <br /> contact the undersigned at(916) 384-0752- <br /> Sincerely, <br /> Stantec Consulting Corporation <br /> Bryan Rorie <br /> Project Scientist <br /> Attachments: <br /> Well Permit Application (for up to five soil borings) <br />