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I <br /> Petroleum hydrocarbons have been detected in the groundwater around the dry well pad area <br /> iāœ“ at concentrations exceeding 1000 ppm (LLNL, 1994). Based on LLNL correspondence, no <br /> petroleum compounds have been detected from the debris burial trenches or from off-site <br /> investigations. LLNL has successfully petitioned regulatory agencies to waive requirements to <br /> analyze groundwater samples for BTEX compounds (LLNL, 1995). <br /> Since June 1991, a groundwater treatment system has been in operation to remediate <br /> groundwater in the area of the debris burial trenches. Contaminated groundwater is pumped <br /> (at ā€”30 gpm), treated with an air sparger and discharged into Corral Hollow streambed. In <br /> March 1992, a groundwater and soil vapor extraction and treatment system was also installed <br /> at the former dry well pad. As of June 1994, the system was undergoing testing and <br /> debugging (LLNL, 19%). <br /> TETRA TECH:Castle Rock Forest Fire Station,Preliminary Site Assessment Report Page 6 <br />