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r <br /> 2.0 EXPERIMENTAL PROCEDURES <br /> Batch tests were performed on site soil and water to meet the objectives itemized in <br /> Section 13 <br /> r' 2.1 Sample Preparation and Characterization <br /> Four soils were received for preliminary evaluation SB-10-1, SB-10-2, SB-10-3, and <br /> SB-11 Each soil consisted of multiple brass sleeves Prior to testing, the sleeves <br /> comprising SB-10-1 were composited, the sleeves comprising SB-10-2 were composited, <br /> and the sleeves comprising SB-10-3 were composited as follows the contents of the <br /> brass sleeves were sieved to remove particles > 4 mesh (2mm) then mixed by hand to <br /> obtain a visually homogeneous sample <br /> rSample SB-11 consisted of 13 sleeves, which were sub-divided into three samples as <br /> follows <br /> - SB 11-15-17.5 consisted of sleeves SB-11-15-15 5, SB-11-15 5-16, SB-11-16- <br /> 16 5, and SB-11-17-17 5 <br /> - SB-11-25-27 consisted of sleeves SB-11-25-25 5, SB-11-25 5-26, SB-11-26-26 5, <br /> and SB-11-26 5-27 <br /> - SB-11-35-37.5 consisted of sleeves SB-11-35-35 5, SB-11-35 5-36, SB-11-36- <br /> 36 5, SB-11-36 5-37, and SB-11-37-37 5 <br /> The three SB-11 sub-samples were composited in the same manner as the SB-10 samples <br /> Two 5-gallon buckets of MW-3 groundwater were received The two containers were <br /> treated as identical samples A 5-gallon bucket of site tap water was also received <br /> r� <br /> Untreated groundwater was analyzed for alkalinity, total ammonia, arsenic, chromium <br /> (total and hexavalent), copper, dissolved oxygen, iron (total and dissolved), manganese <br /> (total and dissolved), methane, nitrate, oxidation-reduction potential (ORP), pH, sulfate, <br /> total organic carbon (TOC), and zinc <br />' Untreated, homogenized soils were analyzed for total chromium and hexavalent <br /> chromium Based on the results, soil SB-10-3 was selected for bench-scale testing <br /> The analytes measured, the procedures used, and the laboratory that performed the <br /> analysis are summarized in Table 1 <br /> r2.2 Soil and Water Buffering Curves <br /> Because the reducing agents being evaluated can affect the pH of the soil and <br /> groundwater, buffering curves were generated to determine how much reagent could be <br /> added without causing long-term effects Soil SB-10-3 was combined with dilute sulfuric <br /> rPRIMA Environmental 3 Eva1 of Reductants <br /> January 19 2005 ATC-Diamond Walnut <br /> r <br />