SITE INFORMATION AND CORRESPONDENCE_1993-1996

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• Lincoln Center May 31 , 1996 Work Plan Page 2 2.4 Delineation of Hazardous Substance Release Areas The underground storage tank that was located at Norge Cleaners was first noted as a potential source without reference to its history. Later (2.4.2 Dry Cleaning Facilities) it was stated that the tank was unused between 1976 and 1985, when it was abandoned. Please include a more thorough evaluation of the tanks use and closure procedures. 2.6.4 Groundwater and Surface Water Quality Summary On page 14, it was stated that LVMD #1, #2, and #6 wells were destroyed in 1992 by pressure grouting with a sand/cement slurry and with neat cement. Reference in this section to the destruction of LVMD#4 was unclear since it still exists, although it is located off site and is not currently in use. 3.2 Overview of the Proposed RI Field Activities Discussion regarding the survey and assessment of existing monitoring wells is unclear whether the survey and assessment will include the wells associated with the Chevron and Wickland investigations. 3.2.2 Meet-And-Confer Sessions While PHS/EHD is aware that the CVRWQCB is the lead regulatory agency, it will be necessary to confer with PHS/EHD regarding changes in the scope of work and scheduling of specific tasks to be performed for the subsequent sequence as related to activities identified within the San Joaquin County Development Code. 3.5 Source Investigation The statement that "such releases" are no longer occurring should be based on an evaluation of the current operations. In similar investigations, particularly in the Lodi area, CaIEPA's contractor noted that operations which one might have assumed were no longer discharging hazardous wastes, continued to discharge the wastes either knowingly or inadvertently. Periodic sampling of sewer effluent may provide data to demonstrate that releases are no longer occurring. 6.5 TS Implementation, Additional Work Plans, and Report Preparation Please note that it may be necessary to obtain approval from the San Joaquin Valley Unified Air Pollution Control District to perform pilot-scale studies that involve potential discharges of contaminants to the atmosphere. Volume I - Appendix A• Site Access Plan The field activities that propose either subsurface penetration or well destruction require PHS/EHD permitting. Permits for drilling or subsurface penetration ($89 fee) are issued to the drilling contractor and are valid throughout the phase of work, on one parcel, and for up to one year. Permits for well destruction ($60 fee) are also issued to the drilling contractor and for work on one parcel, for up to one year.