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As a result of the latest meeting with PG&E over the greater than 500 ppm PCB liquids collection at the PGE Topock C/S filter separator (F/S), presented below is a summary of the deconning and sampling activity which occurred 6/29/00. Vector was instructed to use a high caustic detergent (Cimclean) as the cleaning agent for removing PCB's from the Topock F/S (50:50 Cimclean:water mixture). Diesel was not used in the deconning process. The only equipment cleaned by Vector was the PG&E F/S. Transwestern's filters in its separator were replaced, but no cleaning or deconning was perfromed to this unit. The filters were also replaced in the PG&E separator. The following samples were collected during this project: On the Transwestern side: 1. Wipes (3) of the interrior body of our filter separator after the filters were removed. Large areas were wiped to determine presence/absence of PCB's. (Not 100 sq. cm. sample) 2. A composite sample of a used filter removed from the upstream separator at the Selexol Plant. The filters appeared to be exceptionally clean 3. Composite sample of the fine powdery rust which had collected in the bottom of the F/S. Approximte volume one cup. 4. Composite sample of the used filters from the F/S. Visible appearance of the filters removed from this vessel showed them to be clean and virtually unstained. A small discoloration was present on the ends of each filter confirming that the filters were sealed properly in the F/S. 5. A sample of an unused clean stocked filter. This was a control sample. On the PG&E side: 1. A liquids sample of the residual in the upstream leg of the Topock filter separator prior to deconning. Approx. volume one cup 2. Sample of the solids (fine, blackened, powder) which had collected in the F/S. An estimate of the volume of this material removed form the F/S prior to deconning was approximately one gallon. 3. Wipe samples (3) of the interrior of the F/S prior to deconning (not 100 cm sq. wipe) 4. Used filter media from the F/S. The operation of the F/S filters are designed to be a twice pass through of the same filter. Composite samples were collected of the upstream and downstream portions of the filters. 5. Wipes (3) of the deconned filter separator interrior walls. The only inconsistency observed during the cleaning and inspection process was the volume and buildup of the black fine powdery hydrcarbon material which was present in the F/S at the Topock C/S and conspicuously small amount of rust colored material which was present in Transwestern's F/S . As previously mentioned, samples were collected of both materials. The only difference between the two locations was the color of the materials and the volume. It is suspected that the deconning activity conducted in August of 99 loosened hydrocarbon solids present in the 1850 feet of pipe which had over time moved and collected in the PG&E F/S. The small amount of rust materials observed in the Transwestern F/S is the result of the pigging activity from the Selexol Plant into the Transwestern F/S. I will have reprensentataive samples of both materials. Photographs were also taken of the cleaning and inspection activities and will be available for review at the forthcoming meeting in Flagstaff with PG&E. on the 13th of July. Analytical results will also be completed at this time.

Subject Line:
Latest deconning Activity-Topock Lateral