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Mr Harlan Knoll 6 July 24, 1992 <br /> If the completed wells are dry, the wells will be vapor extraction tested rather than <br /> developed and sampled. A portable vacuum extraction system that is capable of <br /> producing six inches of mercury in vacuum will be used for testing. This unit will be <br /> transported to each site on the back of a flatbed pickup truck along with a generator <br /> capable of producing three-phase power Each well to be tested will have been <br /> completed with a threaded end at the surface to facilitate connections to the vacuum <br /> pump <br /> Because the vacuum test is of short duration an operation permit is not required, <br /> however a letter describing the setup and operation will be sent to the local air board. <br /> Portable carbon vessels will be used to treat extracted soil vapors as required by the <br /> local air board. Any carbon used will be disposed of properly <br /> The vacuum extraction system will be attached to each dry well and will operate until <br /> a minimum of three well volumes of soil vapor have been withdrawn. During vapor <br /> extraction testing, fluctuations in gasoline vapor concentrations as determined using <br /> a PID/or portable gas chromatograph (GC) will be recorded as will vacuum pressure <br /> responses in adjacent wells. If the portable GC is not used, a final vapor sample from <br /> each vapor extraction well will be taken using a Tedlar bag, or equivalent, and <br /> analyzed for TPH-G and BTEX by a laboratory. <br /> Following completion of Phase 11 activities, a Site Assessment Report will be prepared <br /> to summarize data collected during the site assessment activities. The Site <br /> Assessment Report will also address cleanup options and propose methods for <br /> achieving final remediation of the site <br /> If you have any questions concerning the proposed scope of work presented in this <br /> Site Assessment Work Plan, please contact me or Gina Morrison at 510-463-9117. <br /> Very truly yours, <br /> Chris Young, P E <br /> Project Engineer <br /> CY/pm <br /> cc: A Duarte, Time Oil Co. <br /> D. Poole, Canonie Environmental Services Corp. <br /> G. Morrison, Canonie Environmental Services Corp. <br /> PL191-6341REPORTSILOCKEFOR RPT Wuly 22, 19921 CanonleEnvlronmental <br />