10-03-1988 Planning Packet - Laserfiche WebLink

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f thref gallons per e pump. The pump lats will maintain a I pump will route r dissolved volatile and two 200 gallon ximately 350 cubic nd and receives an be directed to the obtained prior to ked wood security, We anticipate that a (r the initial month. 01 begins operation, ts are returned and r approval has been md effluent will be »d for EPA 601/602 will be less than one mpling of discharge. -l.MW-2,MW-2D. ion. All other wells at rarded to the MWCC PCA for review and i V f\ 4PiiiP •0-J ■ .4 l4% - k . -tt. i .* . r comiBenL < 6 Sail »«i SannnM We propose to thinspreakl contaminated soil eaavated during the trench installation. An ideal ar«i for thinspreading b along the southern edge of the proposed trench (Figure 4). There are no residential buildings or industrial buUdings within 200 feet of thb area. In addition, the prevailing winds are westerly across thb area and there are no downwind dwellings or structures for approximately 2,500 feet. We anticipate that approximately 500 to 700 yards of contaminated soil will be excavated during the installation process. The soil will be stockpUed on-site and covered with plastic immediately after excavation. Samples will be collected and forwarded to PACE Laboratories for analysb (EPA 601 /602). The sod will be spread along the southern edge of the trench approximately six inches thick. The soil will be aerated with a field dbc or comparable equipment one time each month until it becomes froien. Aeration tillage would resume again the following spring. Soil samples will be collected 30 days after thinspreading has beer completed. After the initial month, we propose sampling quarterly. Samples will be analyzed for EPA 601/602 parameters. After the first year the sampling schedule wiU be reevaluated. All analytical and operational reports will be forwarded to the MPCA for review. 6.0 METHODS ANT) PROCEDURES ^■1 Sail Samcllna SoU sampling was done in accordance with ASTM:D 1586-84. Using this procedure, a 2 inch O.D. split barrel sampler b driven into the soil by a 140 pound weight falling 30 inches. After an initial set of 6 inches, the number of blows required to drive the sampler an additional 12 inches b known as the penetration resbtance, or the "N- value. The -N" value b an index of the relaUve density of cohesionless soib and the consbtcncy of cohesive soib. 6.1 Soil aassincaUttii As the samples were obtained in the field, they were vbually and manually classified by the crew chief in accordance with ASTM:D 2488-84. Represenative portions of the samples were then returned to the laboratory for further examination and for verification of the field classification. Logs of the borings indicating the depth and identification of the various strata, the N value, water level information and pertinent information regarding the method of maintaining and advancing the drill hole were made. i ■■ Charts iUustrati boring logs wei 6.3 Water Lei! All ground wa indicates when lowering the d< measuring the recorded to the 0.04 foot. ^,4 Wmter Sai All monitorini following pron Step 1: Step 2. Step 3: Step 4: Step 5: Upon complet: records includ' hazard, sampli containers, an: The chain of laboratory, the identification turned over tc