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` make sure that hazardous materials are not allowed to leach into groundwater or surface water. 3.0 Purpose of Investigation The purpose of this investigation is to determine the extent of contamination, if any, from used sand from sandblasting operations, which has been placed on the ground in several small piles, generally as shown in Figure 2, and to define cleanup activities necessary to ensure that contamination does not reach groundwater or surface water adjacent to the site. 4.0 Discussion The operation at TNBR which produced the used sand in question is sandblasting boat bottoms. This process is normally used with metal hulled boats which have been coated ` with coal tar epoxy. Neither coal tar epoxy or sandblasting sand contain copper or other heavy metals (see MSDS in Appendix 1). Therefore, used sand contaminated with copper should be quite rare. However, the fact that it does occur, even infrequently, requires imposition of procedures to prevent contamination of the ground, groundwater or surface water, adjacent to the site. This involves both cleanup of the existing used sand from the site, and establishment of procedures to handle used sand in future, to provide the r required protection. Analytical results obtained to date are listed in Table 1 below: Table 1. Analytical Results for Used Sand Copper Zinc Date By TTLC STLC STLC-DI TTLC (mg/kg) (mgd-) (mgR-) (mg/kg) 10/7/2003 CEPA 3040 78.4 N/A 591 .. 10/7/2003 TNBR 829 68.5 0.17 84 Two samples of used sand were taken on 10/7/03. One of these samples was taken for analysis by the DTSC, and one was left at the site. The first results shown in Table 1 are for the sample taken by the DTSC, the second for the sample retained at the site and - 2 -