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(VYATC • A S a O C i A T E 'a i N C filtered and analyzed for total and hexavalent chronuum, alkahnity, ammonium/ammonia, arsenic, total organic carbon, copper, dissolved and total iron, dissolved and total manganese, methane, nitrate, dissolved oxygen, oxidation-reduction potential, pH, sulfate, and zinc It should be noted that analyses of the slurry leachate for total metals in the water phase will be of little value since the water phase will have some soil particulates in it resulting from the mixed slurry For the ferrous iron test, the amount of reducing agent remaining will be the amount of ferrous iron (as opposed to total dissolved iron) For Cascade, absorbance will be measured - Cascade`s is yellow and typically converts to elemental sulfur that tends to precipitate onto glassware and suck there The conditions of each test are summarized in Table 1 Unfiltered treated samples of the "groundwater-only" matrices will be analyzed for Total Filterable Solids (total suspended and settleable solids) as a qualitative measure of the aquifer plugging potential of the two treatment methods Table 1. Dose Requirement Test Conditions. Test Matrix Amount FeII Amount Cascade 1 Control A GW None None 2 Control B GW+soil None None 3 GW 1 5X Stoich dose None 4 GW 3X Stoich dose None 5 GW+soil 1 5X Stoich dose None 6 GW+soil 3X Stoich dose None i7 GW None 1 5X Stoich dose 8 GW None 3X Stoich dose 9 GW+soil None 1 5X Stoich dose 10 GW+soil None 3X Stoich dose An additional control using site soil and groundwater not impacted by CrVl will be conducted to evaluate the amount of reducing agent consumed by non-impacted soil and groundwater This control will be conducted by creating a series of replicates containing soil and reductant and groundwater and reductant, then measuring reductant over time Dissolved iron will be measured for ferrous iron, and absorbance will be measured for Cascade® This procedure will give an indication of how long each reductant will persist, as much of the loss of reductant is expected to be due to decomposition (Cascade) or precipitation as pH increase (Fe) rather than reaction of the reductant with something in soil The non CrVI impacted soil sample will be obtained by advancing a soil boring in the northern porton of the site in the vicinity of MW-7 and beyond the known extent of CrVI impacted soil A soil sample will be collected from a depth anticipated to be from between 15 to 37 feet This boring will be advance following completion of the angle borings below Vault 8 so as to insure by visual observation, that the non CrVI impacted soil sample is of the same soil type as those collected from below Vault 8 The non CrVI impacted groundwater sample will be collected from the facility well (if the well has not been destroyed) or from monitoring well MW-1 Sample volumes of soil and groundwater will be based on laboratory requirements I I slenvironmentaM25831reportslRevtsedWKP-Bench test doe 6 i