2009-16 PROHIBITING THE USE OF GROUNDWATER AS A POTABLE WATER SUPPLY

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From Sprinqfield Reqional Office � � ��e�� March 27, 2009 ,� �nVlr'onmental City of Decatur 1 Gary K. Anderson Plaza Decatur, Illinois 62523 Attention: Matt Newell, City Engineer Re: Ordinance Prohibiting Groundwater Use Fonner Johnson Oil Lahniers Site 1298 West Eldorado Street, Decatur, Illinois Leaking UST Incident No. 20040352 � American Enviromnental Project Number: J-237074 Dear Mr. Newell: On behalf of Johnson Oil Company (Johnson Oil), the former owner of the above-referenced property, and Tony Romano, the current owner of the property, Ainerican Envirorunental Corporation (American Envirorunental) is currently remediating an underground storage tank (UST) release at this property. However, in order to expediently obtain a No Further Remediation letter for this property, and subsequently return the currently-vacant property to beneficial corrunercial use, the parties above request that the City of Decatur enact a Groundwater Use Ordinance (GUO) to prohibit the potable use of groundwater within a certain area surrounding the above-referenced property. According to the Groundwater Ordinance Status Chart inaintained by the Illinois Environmental Protection Agency's ("IEPA's") Division of Public Water Supply, the City of Decatur has already enacted six GUOs for discrete areas across the City. The purpose of the existing GUOs, as defined by the City of Decatur, is "...to liinit potential threats to human health from groundwater contamination while facilitating the redevelopment and productive use of properties that are at or around the source of chemical constituents." The proposed area for a GUO for the above-referenced site is defined as the inaximum modeled extent of groundwater impacts related to the gasoline release, as detennined using risk-based calculations under the IEPA's Tiered Approach to Corrective Action Objectives (TACO). The inaxiinum inodeled extent of iinpacted groundwater exceeding default reinediation objectives is 994 feet. Therefore, the proposed extent of the requested GUO is 1,000 feet in all directions around the above-referenced site. The attached Figure 1 depicts the proposed extent for the GUO. Calculations to detennine the maximum modeled extent of groundwater impacts are docuinented in the attached March 13, 2009 Amended Corrective Action Plan. American Envirorunental completed a water well survey as part of Site Investigation for the UST release at the site. A Site Investigation Coinpletion Report (SICR) subinitted to the IEPA on September 3, 2008 included maps showing the locations of water wells listed in databases maintained by the Illinois State Geologic Survey, Illinois State Water Survey, and the Agency's Corporate Office Regional Office Regional Office Regional Office 8500 Georgetown Road 3700 W. Grand Ave. Suite A 410 Production Court 4305 Muhlhauser Road, Suite 3 Indianapolis, IN 46268-1647 Springfield, IL 62711 Louisville, KY 40299 Cincinnati, OH 45014 317-871-4090 217-585-9517 502-491-0144 513-874-7740 317-871-4094 Fax 217-585-9518 Fax 502-491-9271 Fax 513-874-7756 Fax