The FY 2003 risk assessment (RA) (Mann et al. 2003) of bulk vitrification (BV) waste packages used 0.3 wt% of the technetium (Tc) inventory as a leachable salt and found it sufficient to create a significant peak in the groundwater concentration in a 100-meter down-gradient well. Although this peak met regulatory limits, considering uncertainty in the actual Tc salt fraction, peak concentrations could exceed the maximum concentration limit (MCL) under some scenarios so reducing the leachable salt inventory is desirable.

This report presents the inorganic, organic and radioisotopic analytical results for a composite sample obtained from tank 241-AP-101 (AR 101). This work was conducted in response to a request by BNFL? The results of the analyses are used to assess the waste composition relative to the contract limits defined in Specification 7 for envelope A. Hanford waste tank 241-AP-101 was sampled on February 8,2000 from Riser 002 at depths of 10, 100, 190,290, and 400 inches from the tank bottom, collecting nominally 130 mL per sample! These samples were received under chain-of-custody by the Radiochemical Processing Laboratory Shielded Analytical Laboratory. All samples were clear yellow with no visible settled or suspended solids. The AP-1 01 grab samples were mixed to form one large composite sample according to Test Plan BNFL-TP-29953-083. Sub-samples from this homogenized AP-101 composite sample were then delivered to various laboratories for specific analyses as defined in the analytical service request (ASR) 5778. The sample was given an internal tracking number of 00-1701. All analyses were run in triplicate. The PNNL standards based management system (SBMS) quality assurance plan was used in support of all analytical operations and is in compliance with HASQARD. The inorganic, radioisotopic, and organic analytes of interest, recommended methods, detection limits, and quality assurance parameters were defined by BNFL. The quality requirements were included in ASR 5778. Analyte determinations were performed according to project-approved procedures. This report presents the physical observations from AP-101 and individual density measurements from the various tank depths sampled. Precipitate production was evaluated at 10"C for seven days on a composite subsample. Also presented are the inorganic, radioisotopic, and organic analytical results for the triplicate AP-101 composite samples. Analyte results are compared to Specification 7 Envelope A limits, where applicable. Data limitations are also described. Quality control, detection limits, and other quality control indicators are discussed relevant to the reporting method. Revision 1 includes addition of PCB results as well as minor editorial corrections. 1.1

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