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RL83 Work Plan Addendum
SWMU B-23A, May 2000
Soils: Tarrant Association (gently undulating).
Known: Trench identified in the 1966 aerial photograph. Approximately 0.10 acres in size, SWMU B-23A is located south of SWMU B-23, west of RMU-5 and SWMU B-20 in the North Pasture.
Previous Investigations: Under Order 71, SWMU B-23A was observed to consist of a trench containing, on the surface, glass ampoules filled with liquid material(s) of different colors.
Under Order 67, a geophysical survey was conducted in March 1995. No anomalies were detected.
Under RL17, a work plan for SWMU B-23A was submitted to TNRCC in February 1996. In August 1996, a soil gas survey was performed. Toluene was detected in one sample. No other VOCs were detected.
Data Needs: Phase I RFI is needed. Analytical data for liquid in ampoules, and analytical data for surface soils. The analytical suite for surface soil will be based on the findings of ampoule analyses.
Rationale for Analytical Program: Based on prior identification of the site as a trench filled with soil that had glass ampoules laying on the surface, chemicals of potential concern will be based on the analytical findings of the ampoule contents.
Closure Activities: The following activities constitute an additional investigation at SWMU B-23A.
Facilitate communication and coordination with the chemical warfare experts from the DOD regarding analysis of ampoule contents. No field work will be completed by Parsons ES until the military has conducted a thorough investigation of the ampoule contents.
After completion of the ampoule analyses results show thatindicates it is appropriate to proceed with a non-hazardous investigation, collect three grab surface soil samples (6 inches below ground surface) around the area containing, or that contained, ampoules. Approximate locations of the surface soil samples are shown on Figure B23A-1. Each sample will be analyzed for analytes detected in the ampoules. QA/QC samples will be collected as described in Section 2.4 of the FSP.
The locations of the surface soil samples will be recorded using a GPS unit.
IDW will be handled as specified in the FSP.
If the results of the above work indicate that the site can be closed under RRS1 without any further remediation, a technical/closure report will be prepared in accordance with TNRCC closure requirements.