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Jim Pinasco <br /> August 15, 1994 <br /> Page 2 <br /> GENERAL COMMENTS AND RECOMMENDATIONS <br /> 1. Logging of Trenches <br /> The work plan states that one trench will be excavated at <br /> Solid Waste Management Unit (SWMU) 14 . The Field Sampling Plan <br /> does not state the trench will be logged. <br /> Recommendations <br /> GSU recommends that all trenches excavated during the Phase <br /> II site characterization be logged. The trench log should be <br /> included in the site characterization report. <br /> 2 . Standard Operating Procedure and Quality Control <br /> Requirements for Soil Gas Survey <br /> Appendix A states that the standard operating procedures and <br /> analytical quality control requirements for the soil gas survey <br /> will be submitted to Montgomery Watson for review and approval <br /> prior to mobilization of the soil gas subcontractor. Review of <br /> standard operating procedure and quality control requirements <br /> prior to implementing the soil gas survey will help ensure <br /> quality data is obtained by using appropriate techniques <br /> including using gas standards and proper analytical instrument <br /> calibrations. <br /> Recommendations <br /> The standard operating procedures and analytical quality <br /> control requirements for the soil gas survey should be submitted <br /> to Department of Toxic Substances Control for review prior to <br /> conducting the field work. <br /> 3 . Use of Centralizers in Monitoring Wells <br /> Appendix A states centralizers will be used for all wells <br /> greater than 50 feet deep. Centralizers ensure the well casing <br /> is centered in the borehole which allows filter pack to be placed <br /> around the entire screen and reduces the potential of bridging of <br /> filter pack and sealant materials placed in the annular space. <br /> MSAI <br /> MS43.0M/10C <br />