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Patten Steel Company Phase H Soil Resampling Page: 2 moisture, plasticity (if applicable), consistency of the earth materials, blow counts, pertinent soil or bedrock characteristics, and any evidence of contamination will be noted. All water- bearing zones and the depths at which they were encountered will be noted on these logs. All borings will be drilled in such a manner as to prevent cross contamination between strata. Exploratory soil borings within the unsaturated zone will be backfilled with a concrete slurry mixture. Borings into the saturated zone will be drilled to a maximum of 20 feet beneath the top of the aquifer being explored. Any perching layers encountered will be investigated to a maximum thickness of 5 feet and will be backfilled with concrete slurry, after a bentonite seal has been placed. If a deeper aquifer is to be investigated, conductor casing will first be grouted into place to seal off the upper aquifer(s), in series if L necessary and drilling will proceed through the conductor casing after the grout has been allowed to set properly. If evidence of contamination is noted during the drilling, the drilling will be halted until the responsible professional determines the advisability of deeper drilling. Upon termination, the boring into the saturated zone will be completed as monitoring wells and backfilled with concrete grout, after a bentonite seal has been placed. The boring for the monitoring well will be of a diameter at least 4 inches greater than the 2 inch diameter of the well casing to be used. The cuttings from the drilling operation will be containerized on-site during drilling for proper disposition. The proper method of disposal will be dependent upon results of laboratory analysis. this disposal will be the responsibility of the client unless other arrangements have been made. 3.0 LABORATORY ANALYSIS We are proposing to test for the following analytes in soil. Total Petroleum Hydrocarbons as gasoline by EPA Method 5030/modified 8015 and as diesel by EPA Methods 35501 modified 8015, benzene, toluene, xylene, and ethyl benzene by EPA Method 8020, and organic lead by WET extraction EPA Method 7421. The detection limits for these analytes analyzed by the above mentioned methods will be gasoline 2.5 mg/kg, diesel 5.0 mg/kg, BTX&E 5.0 µg/kg, and organic lead 1.0 µg/kg.