Sunday, July 28, 2013

Martin Marietta Materials, Inc.

State Water Quality Officials Approve Vanceboro Quarry Discharge Permit


 RALEIGH – The N.C. Division of Water Quality issued permission for to discharge up to 12 million gallons per day of comingled stormwater and groundwater from a proposed mine near Vanceboro into tributaries of Blounts Creek in Beaufort County.

Martin Marietta is also seeking a water withdrawal permit from the N.C. Division of Water Resources. A public hearing on the Division of Water Resources’ permit is scheduled for 6 p.m. July 30 atBeaufort County Community College in Washington.

The quarry operation is to be located on 1,664 acres within a 90,000 acre tract owned by Weyerhaeuser Company, and is anticipated to include a 649-acre open pit aggregate mine when fully developed. The mine will extract crushed limestone for use in the construction industry.

The N.C. Division of Water Quality held a public hearing on the proposed National Pollutant Discharge Elimination System, or NPDES, permit in March. As a result of comments gathered at that hearing and during the comment period, several changes were made to the draft NPDES permit before it was finalized. The changes included:

· Adding a monthly average effluent limit for iron of 1.0 milligram per liter. The limit is based on the state action level for the protection of aquatic life.
· Adding a requirement that within the first year of discharge, the company must submit a site-specific analysis of the effluent following requirements from the Environmental Protection Agency.

· Adding monthly effluent nutrient and temperature monitoring.

· Adding monthly in-stream monitoring for pH, salinity, temperature and turbidity (silt and soils suspended in the water column) at two downstream locations.

· Modifying the flow limits from a monthly average of 4.5 million gallons per day to a daily maximum of 6 million gallons per day at each of two discharge outfalls.

· Modifying the requirement to submit a plan for monitoring aquatic insect life so it must be approved by the Division of Water Quality before sampling begins.

· Reducing of the effluent pH limit range from 6.0-9.0 to 5.5-8.5.

A copy of the NPDES final permit #NC0089168, fact sheet and hearing officer’s report can be found on the N.C. Division of Water Quality’s website, www.ncwaterquality.org, under Hot Topics.

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