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3 2 Action Levels Action levels as identified in the permit are as follows <br /> Benzene 5 0 µg/L <br /> Carbon Tetrachloride 5 0 µg/L <br /> Chloroethane <br /> 13 pg/L <br /> Chloroform <br /> 0 5 µg/L <br /> Chromium 50 0 µg/L <br /> I,1-Dichloroethane 170 0 µg/L <br /> 1,1-Dichloroethene 7 0 pg/L <br /> 1,2-Dichloroethane 0 2 pg/L <br /> 1,2-Dlchloropropane 1 4 µg/L <br /> Ethylbenzene 1 0 pg/l, <br /> Methylene Chloride 5 0 µg/L <br /> Tetrachloroethane 0 3 µg/L <br /> 1,1,1-Trichloroethane 45 0 µg/L <br /> Trichloroethene 5 0 µg/L <br /> Toluene <br /> 45 0 µg/L <br /> Xylenes <br /> 3 2 pg/L <br /> 3 3 Potential Future Changes in System Objectives The Installation and USACE are currently <br /> evaluating alternative remediation system objectives The risk posed by the ground water contamination <br /> is currently being re-evaluated, and alternate clean up standards of 20 ppb or 50 ppb of TCE are being <br /> considered <br /> 4 Site Visit and Data Analysis Summary and Recommendations <br /> 4 1 Findings In general, the RSE team found the system to be well maintained, and operating as <br /> intended The design appears to have been appropriate given what was known about the site at the time <br /> of construction The observations and recommendations given below are not intended to imply a <br /> deficiency in the work of either the designers or operators, but are offered as constructive suggestions in <br /> the best interest of the Department of Defense and public These recommendations obviously have the <br /> benefit of the operational data unavailable to the original designers <br /> 4 1 1 T reaiment System P t'r1UrrI1dI1C.0 T 11C Sy5LC111 11d5 e1Lt�eeded LhG r UgU11 ullent Ikil the Plallt LV <br /> continuously treat water from all active extraction wells at least 95% of the time The system has been <br /> up and running about 98% of the time Most of the 2% downtime has been due to events not under the <br /> Contractors control (e g , power disruptions) <br /> 4 12 Subsurface Performance and Response — Water Levels The water levels for both shallow <br /> and deep zones from March of 1997 were contoured by hand to determine if the existing system as <br /> currently operated is successfully containing the plume It appears that the system is successfully <br /> 06/07/99 <br /> Page 5 of 14 <br />