COMPLIANCE INFO_CASE 1 - Laserfiche WebLink

Home Browse Search

locator may be employed, as necessary, to identify private utility services not located by USA. It is not anticipated that any permitting will be required. 11.3 Insitu Treatment The selected treatment cements the soils in such a way that liquids cannot flow through in sufficient quantities to leach out the metal of concern. Additionally, the solubility of the lead is reduced chemically as the lime/fly ash mixture raises the pH of the treated soil.The treatment contractor will spread the treatment materials over the subject area, will mechanically mix them with the soil, will add water to the optimum moisture content for solidification, and will compact the mixture in place. It is expected that the maximum amendment of treatment materials will consist of 6% lime and 6% fly ash. Material blending and compaction will occur to a depth of 18 inches. The area to be treated is depicted on Figure 3. 11.4 Grading and Drainage Controls The addition of lime and fly ash to the treated soil will result in an increase in volume and therefore the elevation of the treated area. Consequently, it will be necessary to slope the treated area in such a manner that surface runoff is directed away from the shop building and towards Miner Avenue. Grading will need to be accomplished before the treated soil has hardened. This will be accomplished according to the contractor's specifications. 11.5 Paving The treated area will be capped with a multimedia layer consisting of a commercial mix of asphaltic concrete and a polypropylene fabric ("Petromat" or equivalent). The fabric is specifically designed to prolong the service life and enhance the structural integrity of flexible pavements by reducing cracking and preventing infiltration of surface water into subgrade material. The fabric is impregnated with liquid asphalt making it less permeable and creating a flexible bond between asphalt layers. Laboratory test results indicate that a multimedia cap consisting of two 1'/2 inch layers of asphalt separated by the fabric should achieve a permeability of 10-6 cm/sec or less. The multimedia cap would be constructed according to the manufacturer's specifications. The ground surface will first be sprayed with paving oil. Then an initial 11/2-inch lift of asphalt will be applied to the ground surface. The surface will be prepped for placement of the fabric. The layer of fabric will be placed and sprayed with liquid asphalt as specified by the manufacturer. The second lift of asphalt, 11/2-inch in thickness, is then installed for a total cap thickness of 3 inches. The surface will be sloped to direct surface drainage away from the building and towards Miner St. The area to be capped is depicted on Figure 3. roysWeporukraw.ipt 11