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v A S S d C 1 A T E S I N C 3.0 BENCH SCALE LABORATORY TESTING Following receipt of the soil samples by PRIMA, baseline analyses were conducted on the three ' samples collected from SB10 to select the appropriate sample for bench scale testing and evaluation of reductants for in-situ stabilization of hexavalent chromium The baseline analyses performed on the soil and groundwater samples are summarized to Sections 3 1 and 3 2, ' respectively ' 3.1 Baseline Sod Sample Analyses and Characterization The three samples collected from SB 10 were analyzed for alkalinity by EPA Method 310 1, aminoma by Standard Method 4500, nitrate by EPA Method 300, total organic carbon (TOC) by ASTM D2974, CrVI by EPA Method 7199, volatile organic compounds by EPA Method 8260B, and arsenic, total chromium, copper, total iron, total manganese, and zinc by EPA Method 6020 ' The three soil samples collected fiom SBI1 were analyzed for CrVI and total chromium A summary of the baseline soil analytical results is presented in Tables 3-1 and 3-2 Table 3-1 Summary of Baseline Soil Sample Analytical Results Excluding VOCs Anal to Units Sam le ID SB-10-1 SBA 0-2 SB-10-3 SB-11 SBA 1 SBA 1 15-175 25-27 35-375 Hexavalent chromium mg/kg 0 002 0 002 0 006 < 0 001 0 002 0 006 ' Chromium, Total mg/kg 45 65 60 25 46 44 Manganese, Totat mg/kg 940 490 700 n a n a n a Iron, Total mg/kg 27,000 32,000 33,000 n a n a n a ' Copper mg/kg 28 43 45 n a n a n a Zinc mg/kg 56 72 70 n a n a n a Arsenic -mg/kg 36 3 53 n a n a n a ' Alkalinity mg/L 1,200 3,800 12,000 n a n a n a CaCO3 Ammonia mq/kq m /kN 086 < 02 < 02 n n na ' Nitrate m Ikq N < 2 5 < 2 5 57 n a n a n a TOC % 289 435 476 n a n a n a n a =not analyzed ' The soil sample collected from 33 4 --37 3 feet bgs (51310-3) contained the highest concentiation of CiVI, and was therefore selected for use in the bench scale testing conducted by PRIMA ' Refer to PRIMA's Evaluation of Reductants foi the In Situ Stabilization of Hexavalenl Chromium included in Appendix B for detailed information s\environmental\62583\reports\bench test rpt doc 5