DISCLAIMER The full text of certain NPDES permits and the asso ciated fact sheets has been made available to provide online access to this public information. EPA is making permits and fact sheets available electronically to provide convenient access for inte rested public parties and as a reference for permit writers. The ownership of these documents lies with the permitting authority, typically a State with an authorized NPDES program. While EPA makes every effort to ensure that this web site remains current and contains the final version of the active permit, we cannot guarantee it is so. For example, there may be some delay in posting modifications made after a permit is i ssued. Also note that not all active permits are currently available electronically. Only permits and fact sheets for which the full text has been provided to Headquarters by the permitting authoritymay be made available. Headquarters has requested the full text only for permits as they are issued or reissued, beginning November 1, 2002. Please contact the appropriate permitting authority (either a State or EPA Regional office) prior to acting on this information to ensure you have th e most up-to-date permit and/or fact sheet. EPA recognizes the official version of a permit or fact sheet to be the version designated as such and appropriately stored by the respective permitting authority. The documents are gathered from all permitting authorities, and all documents thus obtained are made available electronically, with no screening for completeness or quality. Thus, availability on the website does not constitute endorsement by EPA.Permit No. MI0001368 FACT SHEET

PERMITTEE/FACILITY NAME : U.S. Silica Company / U.S. Silica Company COUNTY : Wayne DESCRIPTION OF EXISTING WASTEWATER TREATMENT FACILITIES : The sand slurry is pumped by pipeline to a st orage pile. The wet sand is fed through wet processing and then to dry processing. Contaminated process waters are fed through a series of settling ponds. Finish water from these ponds is reused in the plant. Overflow from the final pond is discharged. The sand mine dewatering water and limestone mine dewatering water flow through settling basins prior to discharge.

Facility Planar Coordinates : MAP OF DISCHARGE LOCATION : SE1/4, NE1/4, Section 15, Town 5 S, Range 10E Berlin Township, WAYNE COUNTY

Outfall 001 Outfall 002

Outfall 003US Silica Co Fact Sheet Page 2

RECEIVING WATER : The Huron River and Silver Creek are protected for agricultural uses, navigation, industrial water supply, public water supply at the point of water intake, warm-water fish, other indigenous aquatic life and wildlife, partial body contact recreation, and total body contact recreation (May through October). The receiving stream flow for the Huron River used to develop effluent limitations is a 95 percent exceedance flow of 84 cfs. The receiving stream flow for Silver Creek used to develop effluent limitations is a 95 percent exceedance flow of 0.3 cfs. MIXING ZONE : For toxic pollutants, the volume of the Huron River for Outfall 001 or Silver Creek for Outfalls 002 and 003 used in assuring that effluent limitations are sufficiently stringent to meet Water Quality Standards is 25 percent of the applicable design flow of the receiving stream. For other pollutants, the volume of the Huron River for Outfall 001 or Silver Creek for Outfalls 002 and 003 used in assuring that effluent limitations are sufficiently stringent to meet Water Quality Standards is the applicable design flow of the receiving stream. EXISTING EFFLUENT QUALITY : (from application received on August 13, 1999, and DMR data from January 1, 1993, to December 31, 1998)
Minimum Maximum Maximum Parameter DailyMonthlyDailyUnits Outfall 001 Flow – No discharge since 1990 Total Suspended Solids 12 mg/l Hydrogen Sulfide 2 μg/l pH 7.8 7.8 standard units Dissolved Oxygen 7.6 mg/l Outfall 002 Flow 11.5 MGD Total Suspended Solids 22 mg/l Hydrogen Sulfide 96 μg/l pH 6.6 8.1 standard units Dissolved Oxygen 5.7 mg/l Outfall 003 Flow 0.82 MGD Total Suspended Solids 13 mg/l Hydrogen Sulfide 57 μg/l pH 6.6 7.7 standard units Dissolved Oxygen 3.1 mg/lUS Silica Co Fact Sheet Page 3

The previous information is from the fact sheet published August 6, 2000. The DMR data from March 1, 2004, through April 30, 2005, contains the following information.
Minimum Maximum Maximum Parameter DailyMonthlyDailyUnits Outfall 001 – No discharge during this period Outfall 002 Flow 7.44 7.44 MGD Total Suspended Solids 24 52 mg/l 1323 2815 lbs/day Hydrogen Sulfide <30 μg/l pH 7.3 8.0 standard units Dissolved Oxygen 8.0 mg/l Outfall 003– No Discharge during this period
PROPOSED EFFLUENT LIMITATIONS: (see draft permit)

BASIS FOR PROPOSED EFFLUENT LIMITATIONS : Based on this facility's application for an NPDES discharge permit, the Michigan Department of Environmental Quality proposes to issue the applicant a permit to discharge, subject to effluent limitations and certain other conditions within the permit. Effluent limitations and/or monitoring requirements for hydrogen sulfide, dissolved sulf ides, temperature, conductivity, dissolved oxygen, pH, total dissolved solids, chronic toxicity , acute toxicity, total strontium, total lithium, chlorides, sulfate, and outfall observation are based on water quality. Effluent limitations for total suspended solids are based on treatment technology and antibacksliding. Flow monitoring is based on permit writer’s judgment.

ADDITIONAL INFORMATION : The draft permit is the result of negotiations on the permit issued September 27, 2000, that has been withdrawn. The draft permit contains negotiated permit requirements and permit language.

REGISTER OF INTERESTED PERSONS Any person interested in a particular application or group of applications, may leave his/her name, address, and telephone number as part of the file for an application. The list of names will be maintained as a means for persons with an interest in an application to contact others with similar interests.US Silica Co Fact Sheet Page 4

PUBLIC COMMENT Comments or objections to the draft permit received between August 19, 2005, and September 19, 2005 , will be considered in the final decision to issue the permit. If submitted comments indicate significant public interest in the application or if useful information may be produced, the Michigan Department of Environmental Quality, at its discretion, may hold a public hearing on the application. Any person may request the Michigan Department of Environmental Quality to hold a public hearing on the application. The request should include specific reasons for the request, indicating which portions of the application or draft permit constitutes the need for a hearing. Public notice of a hearing will be provided at leas t thirty (30) days in advance. The hearing will normally be held in the vicinity of the discharge. The Michigan Department of Environmental Quality will consider comments made at the hearing when making its final determinations on the permit. Further information regarding the draft permit, and procedures for commenting or requesting a public hearing may be obtained by contacting Jude Woodcock, Permits Section, Water Bureau, Department of Environmental Quality, P.O. Box 30273, Lansing, Michigan, 48909, telephone: 517-373-1329 email: woodcocj@michigan.gov.