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subsequently sent for analysis by TNBR. Sample 1 was hazardous for copper on the basis of both the TTLC and STLC results. Sample 2 was hazardous for copper on the basis of ` the STLC result only. Reports from the respective analytical laboratories are included Appendix 2. �- The STLC-DI result shown for sample 2 used DI water extract instead of the 0.20 M Citrate Buffer solution. This was done to provide guidance as to whether to expect that rain water would extract copper from the used sand and carry it to the soil and ultimately to groundwater. The result would suggest that little or no leaching will occur from rain water falling on the used sand. This is to be expected, since all of the coatings used on boat bottoms, which form the source of the copper contamination, have been formulated ` for durability while immersed in water. The removal by sandblasting is through ablation, not dissolution. Thus the copper contaminants will be coating particulates, which should ` exhibit similar properties with respect to solubility as the original coatings. 5.0 Cleanup Procedure Used sand has been spread on the ground north of the office building in several small, low piles, generally as shown in Figure 2. This used sand will be picked up and placed on a plastic sheet remote from the area of possible contamination. The center of each area where used sand was deposited on the ground will be marked by a wooden stake driven into the ground. r When all of the used sand has been picked up and placed on the plastic sheet, a number of samples will be taken as follows: The pile will be divided into quarters. Two samples will be taken from each quarter, one from the top 2 inches, and 1 from the the bottom 4 inches, making a total of eight separate samples. These will be sent to a State of California approved laboratory under chain of custody. The laboratory will be asked to composite the eight individual samples into a single sample for analysis for copper on a total basis (TTLC analysis using EPA methods 3050B and 6010B to extract and analyze the sample respectively). The laboratory will be requested to save the sample in case additional analyses are required. - 3 -