CC RES 01-029 A RESOLUTION APPROVING URS -BRW, INC. TO COMPLETE PHASE II INVESTIGATION IN CONJUNCTION WITH THE REDEVELOPMENT OF CENTRAL PARK

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URS • BRW, Inc. Jay Hartman January 17,2001 Page 3 Test Trenches and Test Pits Five test trenches will be conducted to attempt to better characterize the nature and extent of the dump materials at the site. The trenches will be advanced along the toe of the slope of the sliding hill below the parking lot. The trenches will be spaced at roughly 100-foot intervals. Trench dimensions will be up to 40 feet long, three feet wide and ten feet deep. Detailed logs of the trenches will be prepared to document the nature of the fill materials encountered. Photographs will also be taken of each trench. Samples of the dump material will be collected from the trenches for field screening and laboratory analysis. The samples will be screened for volatile organic compounds (VOCs) with a photoionization detector (PID) and for methane with a combustible gas meter. Selected samples will be submitted for laboratory analysis. The samples will be analyzed for a combination of the following parameters: • VOCs-Minnesota Department of Health(MDH)Method 466A; • Diesel Range Organics (DRO) - Modified Wisconsin Department of Natural Resources (WDNR) DRO Method; • Gasoline Range Organics(GRO)-Modified WDNR GRO Method; • • RCRA Metals (arsenic, barium, cadmium, chromium, lead, mercury, selenium and silver) - USEPA Method SW-846 -7000 Series; • Polychlorinated Biphenyls(PCBs) -USEPA Method 8082; and • Polynuclear Aromatic Hydrocarbons(PAHs) -USEPA Method 8270. For cost estimating purposes, we assume that two samples from each trench (ten samples) will be analyzed for each of the above parameters. Soil Borings and Temporary Monitoring Wells Eleven soil borings will be advanced at the site to characterize the nature and define the extent of the identified release to ground water at the site, and to assist in determining the extent of dump materials, and to evaluate the type and thickness of cover soils over the dump materials. Each boring will be approximately 20 feet deep. Samples will be collected from the borings at continuous two-foot intervals. Samples of the fill material will be collected for field screening and laboratory analysis. The samples will be screened for VOCs with a PID and for methane with a combustible gas meter. Selected samples will be submitted for laboratory analysis. The fill samples will be analyzed for a combination of the following parameters: • VOCs-MDH Method 466A; • DRO -Modified WDNR DRO Method; • GRO -Modified WDNR GRO Method; • RCRA Metals (arsenic, barium, cadmium, chromium, lead, mercury, selenium and silver) - USEPA Method SW-846-7000 Series; • • PCBs -USEPA Method 8082; and • PAHs -USEPA Method 8270.