Laserfiche WebLink
-L •* - •n4. <br />r <br />**' i*I;' ■ ‘.V <br />}V <br />f r ■h' <br />■■:i <br />1^ ■- <br />fr* <br />I ’{ <br />beiiiiitiabi <br />9 2 - •; ' . 0 3 <br />PROJECT DESCRIPTION <br />Hennepin County, Minnesota proposes to pave a portion of <br />Pioneer Trail in the City of Corcoran, Minnesota between County <br />Transportation Highway (CTH) 19 and the Corcoran/ Greenfield city <br />limit using a mixture of conventional natural aggregate and a <br />synthetic aggregate produced by Municipal Services Corporation <br />(MSC). MSC is a subsidiary of USPCI and the Union Pacific <br />Corporation. The synthetic aggregate, or treated ash product <br />("TAP”), is made using combined fly ash and bottom ash from <br />Hennepin County's HERC Waste-to-Energy Facility and a proprietary <br />mixture of other ingredients. <br />The main objective of this Demonstration Project is to <br />demonstrate the environmental safety of this material, as well as <br />its physical roadbuilding properties. The entire 1/2 mile length <br />of Pioneer Trail between CTH 19 and the Corcoran city limit (see <br />Figure 1) will be paved by Hennepin County. A "test section" of <br />approximately 750 feet will contain the TAP. Portions of the <br />balance will serve as experimental control. <br />The Demonstration Project will be conducted under the strict <br />conditions of a permit to be issued by the Minnesota Pollution <br />Control Agency (MPCA). The site will be inspected and monitored <br />on a regular basis over a period of 5 years. Samples of the <br />pavement will be analyzed for physical and chemical changes, and <br />samples of the air, soils, and water in the vicinity of the test <br />section will be tested for their chemical composition. <br />HEALTH RISK ASSESSMENT (HRA) <br />Rationale <br />Prior to initiating the Demonstration Project, existing <br />laboratory analytical data regarding the chemical composition of <br />TAP, conventional natural aggregate road building material, and <br />unpaved roadway soils as they currently exist were utilized to <br />assess the relative potential health risks and environmental <br />impacts of the following three alternatives: <br />Leaving the existing road unpaved <br />Paving the road with conventional asphalt material using <br />100 percent natural aggregate <br />Paving the road with asphalt (Test Section) in which <br />30 percent of the conventional natural aggregate has been <br />replaced with TAP aggregate