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LOW WATER LEVEL TURNS OFF RECIRCULATING PUMP AT FLOAT SWITCH IN AERATION TANK PREVENTING PUMP FROM AERATION TANK IS GETTING TOO HOT. WILL NOT RESTART ACTIVATED RECIRCULATING PUMP UNTIL LOW LEVEL FLOAT SWITH IS NO LONGER ACTIVE, HIGH WATER LEVEL TURNS OFF CONTROLLER FOR GROUNDWATER FLOAT SWITCH IN PUMP MWIO. PREVENTING ADDITIONAL AERATION TANK IS WATER ENTERING AERATION TANK AND ACTIVATED OVERFILLING AERATION TANK. CONTROLLER FOR GROUNDWATER PUMPS WILL NOT START AGAIN UNTIL HIGH LEVEL SWITCH IS NO LONGER ACTIVE. LEL IN ALARM AT 10% TURNS OFF PUMPS AND PREVENTS ADDITIONAL DISCHARGE TO SEWER. MANUAL INSPECTION AND RESET IS NECESSARY TO REACTIVATE SYSTEM. Maintenance: Due to the operation of a chart recorded for the LEL sensor, weekly chart change out is required. Monitoring of the remediation system will be performed weekly. During the weekly visits the following monitoring and maintenance is performed. • Change out LEL chart. • Inspect water phase carbons for leaks and or suspect conditions: shut down treatment system if carbon unit(s) is leaking and/or looks unsafe, remove suspect carbon unit from system. Check pressure gauges and record pressure readings. o Inspect pumps for operation, and any fouling, clean pumps as necessary. o Check auto shut down devices to verify they are functional • High level float switch in dump tank. Shuts down recirculating pump from aeration tank—prevents discharge to Carbon units 3, 4, 5 and dump tank. • High level float switch in aeration tank. Shuts off pump in MWIO to prevent overfilling aeration tank. o Low level float switch in aeration tank. Shuts off recirculating pump in aeration tank to prevent pump from running dry, thereby getting too hot. o LEL 10% alarm, shuts of all pumps preventing additional discharge to sewer. Has to be manually reset after inspection of system. • inspect all discharge lines for leakage. Shut down system and repair as needed. o Sample between water carbons 3 and 4 weekly for TBA. o Check sediment level in aeration tank. If sediment is in access of 12 inches, schedule a pump truck to remove fluids and sediments from aeration tank. o Check discharge-totaling meter with calibrated 5-gallon bucket to insure meter operating properly. Remove from system and clean-- inspect as necessary. o Measure recovery wells MW10 output by recording discharge into 5 gallon calibrated bucket for 0.5 minutes. Adjust as needed to keep discharge at or below 10 gallon per minute. 3 WATER TREATMENT modification May 2005