SITE INFORMATION AND CORRESPONDENCE_1993-2003

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NFA Sites • -2- • 29 October 1993 DDRW, Sharpe The enclosed Table 1 presents the list of sites for which we have continuing concerns. The list is divided into the three following categories: CATEGORY I SITES The sites in Category I, Table 1, are those that the Board believes are appropriate to consider for no further action. Category I sites must be confirmed to be appropriate for no further action, using historical aerial photographs to verify that there is no significant visual evidence of past disposal practices. Placement of sites in Category I is based on limited information, including some technical data and operational practices, using best professional judgement. CATEGORY II SITES The sites listed in Category II, Table 1, are those that the Board continues to have concerns because these sites have been inadequately documented, there may be existing data which has not been presented in a comprehensive fashion or not reported. Placement of sites in Category II is based on concerns described in comments to the Draft Soils FS Report (June, 1993), Draft Soils FS Report and Appendix A - Problem Assessment Report for Underground Storage Tanks (February, 1992), and Work Plan Addendum (July, 1992). It is DDRW, Sharpe's responsibility to assemble and present all existing information on individual l Category II sites (see Table 1). Sites may be grouped together where location and operations are (/ similar. All existing information should be reviewed and summarized such as historical aerial photographs, technical data of soil, soil gas, and ground water sampling relevant to the site, to assess if substances and activities at the site could threaten ground water. This information then provides the basis for making a NFA decision, or for identifying the need for more work in order to make any decision, NFA or remediation. At a minimum, the following written information must presented for each site or group of sites: 1. Summary tables of existing data (soils boring samples, soil gas data, ground water data up and down gradient of site, etc.) 2. Maps with locations of borings, wells, soil gas probes, direction of ground water flow, etc. 3. Sample evaluation table (see attached example, IRP Data Summary, Mather AFB, July 1993). 4. Discussion of the analytical data, aerial photographs and any other qualitative information. As we further discuss the NFA documentation needs, other relevant information may have to be included. In addition, there may be several Category II sites that may qualify for NFA status with minor clarifications. This will be further discussed at the upcoming RPM meeting.