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Home My WebLink AboutNC0000361_Fact Sheet_19860702 N. C. DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES ENVIRONMENTAL MANAGEMENT COMMISSION FACT SHEET APPLICATION FOR NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM PERMIT TO DISCHARGE TREATED WASTEWATER Application Number NC0000361 Date 1. SYNOPSIS OF APPLICATION a. Name and Address of Applicant Unimin Corporation - Mica Operation Post Office Box 628 Spruce Pine, North Carolina 28777 b. Description of Applicant' s Operation Production of clay, feldspar, mica, quartz and sand. c. Production Capacity of Facility 1250 tons/day of raw ore - Discharge 001 515 tons/day of raw ore - Discharge 002 d. Applicant' s Receiving Waters North Toe River Classification - "WS III - Trout" For a sketch showing the location of the discharge(s) , see Attachment A. e. Description of Existing Pollution Abatement Facilities The existing wastewater treatment system consists of an influent lift station, screw classifier, two hydrocyclones, three inorganic solids settling basins operated in series, continuous pH recorder, automatic effluent pH control system with control units on the lime and sulfuric acid feed systems, baffled flume to improve mixing and flow measuring and totalizing equipment. f. Description of Discharges (as reported by applicant) • Discharge 001 - Non-Fluoride Bearing Wastewater Pollutants which are present in significant quantities or which are subject to effluent limitation are as follows: Effluent Characteristic Reported Load (Specify Units) Average Maximum Flow 0. 81 MGD 1.83 MGD Total Suspended Solids 7 . 32 mg/1 26. 1 mg/1 Fluorides 0. 27 mg/1 0.48 mg/1 pH min . 6.0 s.u. max 9.0 s.u. Turbidity 8.0 NTU 18 NTU Settleable Matter <0. 1 m1/1 Effluent monitoring data reported by Unimin Corporation during September 1, 1990 - August 31, 1991 . Discharge 002 - Fluoride Bearing Wastewater. No discharge has occurred from this discharge point. No data is available. 2B. PROPOSED FINAL EFFLUENT LIMITATIONS Effluent Characteristic Discharge Limitation LlbsJday). Other Limitations Daily Daily (Specify Units) Average Maximum Average Maximum Discharge 001 Flow 2 . 16 MGD Total Suspended Solids 20 mg/1 30 mg/1 Fluorides Settleable Solids Turbidity (See below) pH 6.0 su 10.0 su Temperature (See below) Chronic Toxicity Pass/Fail at 5. 2% - See Attachment B This discharge shall not increase turbidity in the receiving water more than 10 NTU. If the turbidity exceeds 10 NTU due to natural conditions, the discharge shall not cause any increase in turbidity. The temperature of the effluent shall be such as not to cause an increase in the temperature of the receiving stream of more than 0. 5 degrees C and in no case cause the ambient water temperature to exceed 20 degrees C. Discharge 002 Flow 0. 300 MGD Total Suspended Solids 707 1414 Fluorides 103 206 Settleable Solids Turbidity (See below) pH 6.0 su 10.0 su Chronic Toxicity Pass/Fail at 5 . 2% - See Attachment C This discharge shall not increase turbidity in the receiving water more than 10 NTU. If the turbidity exceeds 10 NTU due to natural conditions, the discharge shall not cause any increase in turbidity. TTNTT"IT"T CO.RPO I;TION—MICA ATTACHMEI T A 4 n /%-Gree ley Ch _ 1 `a ax 1. `� • '.-�% � ..�,:;- �. `�, V .'1. 000, \ ! _ ` � •� . - _ �-�� ' ---� -, Wit` � --- - �ri8 `_ - a � � • ,�i�'� � � ` � _-,z � c ,�� Aga--�:.- ]• a j- .re Park �•I 1 / y /'`. +,, - � "µl � � %� � _r--r V �� r • �f J / / �,,� ` A l «,/�- n� •. C/.` ^ ilk` ' (��\ ; tom• - � , �� ` r �,��' % �/ � ..'1�,: � �� . - � -- ��"/,'per.=r� ��%.` 1\✓•; �/� � - .�v-�•�' �� /� ,d ��- 1 � r ��-� � �, l - r 1 H .• .` ' �� 1 1 � �, _ _ • �., : � `'`1 11`� bye. v n r� , ATTACHMENT B Chronic Toxicity Testing Requirement Discharge 001 The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in: 1 . The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic Bioassay Procedures - Revised *February, 1987 ) or subsequent versions. The effluent concentration at which there,..-may be no observable inhibition of reproduction or significant mortality is 5.2% (defined as treatment two in the. North Carolina procedure document) . The permit holder shall perform quarterly monitoring using this procedure to establish compliance with permit condition. The first test will he performed within thirty days from issuance of this permit during t-.ije months of February, May, August, and November. Effluent sampl.iHg for this testing shall be performed at the NPDES permitted final effauent discharge below all treatment processes. All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Form (MR-1) for the month in which it was performed, using the appropriate parameter code TGP3B. Additionally;` DEM Form AT-1 (original) is to be sent to the following address: Environmental Sciences Branch North Carolina Division of Environmental Management 4401 Reedy Creek Road Raleigh, North Carolina 27607 Test data shall be complete and accurate and include all sypporting chemical/physical measurements performed in association tg th the toxicity tests, as well as a1.1 dose/response data. Total residual chlorine of the effluent toxicity must be measured and reported if chlorine is employed foi disinfection of the waste stream. Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Environmental Management indicate potential impacts to the receiving stream, this permit may be reopened and modified to include alternate monitoring requirements or limitations . Note: Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival and appropriate environmental controls, shall constitute an invalid tests and will require immediate retesting (within 30 days of initial monitoring event) . Failure to submit suitable test results will constitute non-compliance with monitoring requirements. ATTACHMENT C Chronic Toxicity Testing Requirement Discharge 002 • The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in: 1 . The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic Bioassay Procedures - Revised *February, 1987) or subsequent versions. The effluent concentration at which there may be no observable inhibition of reproduction or s'ignif_icaht mortality is 5.2% (defined as treatment two in the North Carolina procedure document) . The permit holder shall perform quarterly monitoring using this procedure to establish compliance with permit condition. The first test will be performed within thirty days from issuance of this permit during the months of February, May, August, and November. Effluent sampl.i\kg --for this testing shall be performed at the NPDES permitted final effiluent discharge below all treatment processes. All toxicity testing results required. as part of this permit condition will be entered on the Effluent Discharge Monitoring Form (MR-i) for the month in which it was performed, using the appropriate parameter code TGP3B. Additionally DEM Form AT-1 (original) is to be sent to the following address: Environmental Sciences Branch North Carolina Division of Environmental Management 4401 Reedy Creek Road Raleigh, North Carolina 27607 Test data shall be complete and accurate and include all supporting chemical/physical measurements performed in association ith the toxicity tests, as well as all dose/response data. Total esidual chlorine of the effluent toxicity must be measured and reported if chlorine is employed for disinfection of the waste • 'stream. Should any test data from this monitoring requirement or tests performed by the North Carolina ni.-7ision of Environmental Management indicate potential impacts to the receiving stream, this permit may be reopened and modified to include alternate monitoring requirements or limitations . Note: Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival and appropriate environmental controls, shall constitute an invalid tests and will require immediate ^4^ct.ing (within 30 days of initial monitoring event) . Failure to submit suitable test results will constitute non-compliance with monitoring requirements.