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ti Metropolitan Waste Control Commission Mears Park Centre, 230 East Fifth Street, St. Paul, Minnesota 55101 December 20, 1988 A.D. Johnson Williams Pipe Line Company 2500 39th Avenue NE #246 St. Anthony, MN 55421 612 222 -8423 RE: Approval for Contaminated Groundwater Generated During Cleanup Operations at Williams Pipe Line Viking Drive, Little Canada, Minnesota, Mr, Johnson: The Metropolitan Waste Control Commission (MWCC) hereby approves the discharge of contaminated groundwater to the Metropolitan Disposal System (MDS). The discharge is to occur at the location of 435 Viking Drive, Little Canada. The approval is conditional based on the following: 1. The approval to discharge becomes effective on January 1, 1989 and expires on December 31, 1989. 2. The discharge rate and location shall continue to be approved by the City of Little Canada. 3. The discharge volume shall be measured and reported on a quarterly basis to both the MWCC and City of Little Canada. Billing for sewer use shall be arranged with the City of Little Canada. 4. The contaminated groundwater shall pass through an oil /water separator with a detention time of not less than 30 minutes prior to disposal to the sanitary sewer. The separation tank shall be vented in such a manner to prevent vapors from entering the sanitary sewer. Solids or liquids retained by the separator shall not be disposed of into the MDS. 5. Samples of the discharge shall be taken monthly. The samples shall be analyzed for the following parameters: Benzene, Toluene and Xylenes and Total Hydrocarbons expressed as gasoline. Analytical methods shall meet EPA protocol (Code of Federal Regulations Part 136). 6. The discharge shall be regulated so no single toxic organic in the discharge is present in a concentration greater than 5 mg /1 and no combination of toxic organics shall exceed 15 mg /1. Total hydrocarbons expressed as gasoline shall not be greater than 100 mg /1. PLEASE NOTE OUR NEW ADDRESS CHANGE