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HomeMy WebLinkAboutNC0000272_Annual Progress Color Report_20130701 evergreen,Mr/ Canton Office packaging 1 75 Main Street• Canton, NC 28716 NMM 44-13 July 1,2013 CERTIFIED MAIL RETURN RECEIPT REQUESTED 7009 3220 0007 0371 4286 Chuck Cranford Regional Supervisor Division of Water Quality, Surface Water Protection North Carolina Department of Environment and Natural Resources Asheville Regional Office 2090 U.S. Highway 70 Swannanoa,North Carolina 28778 Re: Annual Progress Report on Color NPDES Permit No.NC0000272 Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton Mill Dear Mr. Cranford— Enclosed is the Annual Progress Report on Color required by Part I A.(8.) item 8 of the May 26,2010 NPDES permit. This report covers the second year of the permit(July 2012 through June 2013). Very truly yours, BLUE RIDGE PAPER PRODUCTS INC. DOING BUSINESS AS EVERGREEN PACKAGING By: Nick McCracken Water Compliance Coordinator 828-646-2874 nick.mccrackenkeverpack.com Enclosure: July 2013 Annual Progress Report on Color cc: NC DWQ—Complex NPDES Permitting Unit, Raleigh Billy Clarke, Roberts and Stevens Internal distribution fresh by design. EOHS\Share\Water\Color Reports 2010 Prmt Doing Business in California as Evergreen Beverage Packaging July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 I. Introduction Part I A.(8.) item 8 of the May 2010 NPDES permit states — The facility will provide annual progress reports to the Division on the color reduction efforts. This report fulfills the requirement of Part I A.(8.) item 8 for the third year of the permit , July 2012 through June 2013, with emphasis on the mill's Best Management Practices (BMP) program refinements and the Color Perception Study on the Pigeon River. Color-related reports previously submitted to the NC Division of Water Quality (DWQ) under terms of the May 2010 NPDES permit include the following: o July 2011 Annual Progress Report on Color [Evergreen 2011] o February 2012 Update to the Color Reduction Implementation Plan [Evergreen 2012a] o July 2012 Annual Progress Report on Color [Evergreen 2012d] These reports are incorporated by reference. II. BacklZround Levels of color in the wastewater effluent from the Canton Mill are among the best of Kraft pulp and paper mills in the world [EKONO 2005,NCASI 2006]. This high level of color performance is achieved by in-process controls and BMP's. The Canton Mill continues to operate the controls and practices proven successful for color prevention. These controls and practices go well beyond the requirements of the EPA Cluster Rule Page 1 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 for Pulp and Paper (40 CFR 430, Subpart B). Many, such as the Bleach Filtrate Recycling ProcessTM, are unique to the Canton Mill. The May 2010 NPDES permit includes a daily maximum effluent true color limit of 105,250 lbs per day. The permit also specifies a monthly average true color limit of 52,000 lbs per day and an annual average (calendar year) true color limit of 38,020 lbs per day. Compliance with these effluent limits requires significant management of mill operations related to color. Prevention of wastewater effluent color is a priority for mill operations every day. III. Color Performance Figure 1 illustrates the color performance of the Canton Mill since 1997. Annual average effluent true color in Figure 1 is presented in units of 1000 lbs per day. The calculation of effluent color as a daily mass (lbs) is defined in Part I A.(8.) items 2&3 of the permit: color (lbs/day) = effluent flow (mgd) x effluent true color (platinum cobalt units) x 8.34. Effluent true color is measured using NCASI method 253 (1971). Page 2 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 ------------------------- Figure 1 - Annual Average Effluent Color Blue Ridge Paper Canton Mill, 1988 thru 2012 65 62.2 �60 ca -0 55 c 50 47.8 44.6 45 . 41.1 41.2 O 40 39.137.9 5 37.1 36.1 36.5 35.9 35.3 34.8 035 M 30 W 111411 '�9g6 1�999 `ZJpO Zip" 'Ozrl Zdp'3 2SjpDl 101116 2011 6 10111 Zdp6 2Sjp0 �0 2O11 I-PN2 The best color performance for the Canton Mill occurs during normal, or full, production. At full production, the internal recycling and recovery of process filtrates, pulping liquors and other process wastewaters is balanced. Color materials are contained within the Kraft pulping process at efficiency greater than 99 percent. Color performance is affected by process variability. Color materials can be lost during startup and shutdown associated with a process upset, production curtailment or unplanned outage. The Canton Mill has an environmental and economic incentive to maintain process reliability and operate at full production. Effluent color performance in 2012 was excellent and demonstrated an improvement over the prior year's color performance. The increased outage schedule for the lower end of Page 3 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 the mill helped with reliability. The associated shortened Recovery Boiler cyclone washes allowed pulp mill operations to continue to run with reduced unscheduled downtime. Other opportunities were discovered within the Evaporator area, which allowed an increase in throughput and a more reliable startup without carryover. These changes and improvements contributed to improved color performance in 2012. IV. Color Proiects and Refinements to Best Management Practices The Canton Mill has a standing Color Team that meets regularly to review color performance. The Color Team members include managers, supervisors and engineers involved with production, maintenance, wastewater treatment and regulatory affairs. The Color Team's scope includes: • Monitoring color performance and the effectiveness of mill systems to prevent effluent color • Identifying and tracking corrective actions related to Cluster Rule BMP color events • Planning and reviewing process trials related to effluent color • Planning and reviewing the effectiveness of capital and expense projects related to effluent color • Reviewing production and wastewater treatment issues that may affect operating reliability and effluent color. Page 4 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 --------------------------------------------------------------- The Color Team evaluates projects, trials and process initiatives. Not all are successful. The July 2012 Color Progress Report [Evergreen 2012d] documented significant Color Team activities between May 2006 and May 2012. Significant activities since 2010 are outlined in Tables 1 and 2. Capital projects in Table 1 are identified by Capital Improvement Project (CIP) number. Other projects were completed on operations and maintenance expense. Direct spending on Color Team related projects, trials and initiatives identified in Tables 1 and 2 during the period May 2010 through May 2013 exceeded $3.5 MM. These costs are in addition to the on-going cost to operate and maintain color prevention systems at the Canton Mill. Table 1 Color Team Capital and Maintenance Projects 2010 - Forward Year Project Description and Cost Information for Capital Projects 2010 East Heavy/Tall Oil Sump transfer line repair. This was a proactive measure to prevent color material losses from this transfer line. BMP sustaining measure. o Completed August 2010, cnsd* Replaced decant line from Turpentine loading to 4A manhole. This was a proactive measure to prevent losses from this transfer line. BMP sustaining measure. o Completed 2010 o CIP—315223 o Cost- $275,000 Repair and recoating of west side of Camp Branch compound. Project to maintain integrity of spill containment. BMP sustaining measure. o Completed 2010 o CIP—315588 o Cost- $235,000 Page 5 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 Table 1 Color Team Capital and Maintenance Projects 2010 - Forward Year Project Description and Cost Information for Capital Projects 2010 Several black liquor transfer line replacements including East Heavy storage tank and West GB Discharge. BMP sustaining measure. o Completed 2010, cnsd* Replaced conductivity and level switches in East Heavy compound with new, more reliable type. BMP improvement. o Completed 3Q 2010, cnsd* Relocation of sewer conductivity meter below Digester Area sumps. BMP optimization in this area. o Completed November 2010, cnsd* West Heavy Liquor(former Red Liquor Tank) shell replacement/repairs. BMP sustaining measure. o Completed May 2010 o CIP— 266446 o Cost— $265,000 Mini-Hoods on No. 11 Smelt Dissolving Tank(SMDT). Allows substitution of weak wash for clean water in SMDT demister creating more process demand for weak wash and reducing high pH material discharged to sewer. Related to the weak wash purge strategy(Table 2) and TRW Recommendations regarding prevention of sewer-generated color—high pH. o Completed 3Q 2010, cnsd* Installation of spray bar on the 5th effect of the Swenson evaporator set. Spray allows the 5th effect chevrons to be cleaned on the run reducing the amount of carryover color in the condensate system during normal operation between evaporator outages. Color material carry over from evaporators into condensates is related to TRW Recommendations to prevent sewer-generated color. o Completed October 2010, cnsd* Page 6 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 Table 1 Color Team Capital and Maintenance Projects 2010 - Forward Year Project Description and Cost Information for Capital Projects 2010 North White Liquor Tank shell replacement/repairs. BMP sustaining measure and project related to TRW Recommendations regarding prevention of sewer-generated color—high pH white liquor. o Completed Dec 2010 o CIP—322435 o Cost— $724,000 2011 Process lines to allow front-end boil out of West GB evaporator set. Allows more frequent, less intense evaporator cleaning. BMP improvement for process reliability to avoid carryover of color material into condensate systems. Reduces the volume of color material generated by evaporator boil out during outages. Color material carry over from evaporators into condensates is related to TRW Recommendations to prevent sewer-generated color. o Completed May 2011, cnsd* Repaired drain valves on No. 2 and 3 Primary Clarifiers. Allows reliable isolation of one of these larger volume clarifiers as the spare clarifier for high color material diversion during semi-annual outages. BMP sustaining measure. o Completed March 2011, cnsd* Pine Weak Liquor Tank shell replacement/repairs. BMP sustaining measure. o Completed May 2011 o CIP—331985 o Cost— $349,000 Page 7 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 Table 1 Color Team Capital and Maintenance Projects 2010 - Forward Year Project Description and Cost Information for Capital Projects 2011 Installed soft start on motors for the hardwood weak black liquor transfer pumps and hardwood blow tower dilution pumps. Project reduces pump start water hammer in pipes containing black liquor and reduces risk of gasket failure, valve failure and/or pipe hanger failure from water hammer pipe movement. Project was identified by a water hammer valve failure in May 2011 that was contained within the process and did not reach the wastewater plant. o Completed May 201 Ion hardwood blow tower dilution pumps o Completed Jul 2011 on hardwood weak black transfer pumps o 4 soft starts at $7540 each,project cost of$30,160 plus installation cost on maintenance expense 2012 Installation of new Oramac shower bars on the East Decker at the Hardwood Fiberline. These shower bars help improve washing efficiency and reduced carry-over of sodium compounds into the bleach plant,which in turn, will reduce D 1 stage C102 demand and effluent color from the bleach plant. o Completed April 2012 o Cost-—$40,000 Replaced shower bars on hardwood East Decker with improved design matching shower bars previously installed on hardwood brownstock washers. These shower bars improve washing and reduce carryover of color materials into the bleach plant. Liebergott Recommendation. o Completed during May 2012 hardwood semi-annual outage as part of larger East Decker vat repair project o CIP—358168 o Cost— $32,000 for shower bar portion of project Replaced level controls on condensate flash tanks on the West GB evaporator set. The new controls are more reliable and less prone to plugging and false level indication that can cause color material carryover into the combined condensate system, which contributes to sewer generated color. Related to TRW Recommendations regarding prevention of sewer generated color. o Completed during May 2012 semi-annual outage o 2 capillary level elements and isolation valves at $9500 each,project cost of$ 29,000 including installation on maintenance expense Page 8 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 Table 1 Color Team Capital and Maintenance Projects 2010 - Forward Year Project Description and Cost Information for Capital Projects 2012 West GB Skim Tank cleaning and repair of leaks. BMP sustaining measures. o Completed July 2012 o Cost- $125,000 West Heavy Liquor Tank compound sealing and lining. BMP sustaining measure. o Completed August 2012 o Cost- $150,000 Replacement of floor drain piping in Hardwood fiberline. Floor drains carry spill material directly to the Hardwood Spill Tank. This replacement minimized losses to the mill sewer system. o Completed Fall 2012, cnsd* Sealing and lining of the West Unoxidized Black Liquor compound. BMP sustaining measure to reduce potential leakage of high pH material and to reinstate the integrity of the containment and sump. o Completed August 2012 Cost- $150,000 West GB Feed Tank cleaning and repair of leaks. BMP sustaining measures. o Completed September 2012 o Cost- $75,000 Replacement of floor drains on#10 Recovery Boiler. BMP sustaining measure. o Completed October 2012 o Cost- $150,000 Wash Water line replacement(phase II). Project identified to improve line integrity and prevent potential elevated color losses from reaching the mill sewer system. o Completed December 2012 o CIP - 371577 o Cost- $99,333 Page 9 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 Table 1 Color Team Capital and Maintenance Projects 2010 - Forward Year Project Description and Cost Information for Capital Projects 2013 Relocation of#5B Sewer conductivity meter and sampler. BMP improvement measure related to TRW Recommendations to further improve leak detection and process monitoring. o Completed January 2013, cnsd* South Green Liquor Clarifier shell replacement/repairs. BMP sustaining measure and project related to TRW Recommendations regarding prevention of sewer-generated color—high pH green liquor. o Completed February 2013 o CIP - 370243 o Cost- $581,442 Installation of an additional a-drain located on the north side of the Hardwood Blow Tower. This drain will allow the capture and redirection of weak black liquor material from around the blow tower to the mill sump system. o Completed March 2013 o Cost- $36,641 West Green Liquor Clarifier shell replacement/repairs. BMP sustaining measure and project related to TRW Recommendations regarding prevention of sewer-generated color—high pH green liquor. o Completed March 2013 o CIP - 370243 o Cost- $122,000 Installation of new Oramac shower bars on the West Decker at the Hardwood Fiberline. These shower bars help improve washing efficiency and reduced carry-over of sodium compounds into the bleach plant, which in turn, will reduce D 1 stage C102 demand and effluent color from the bleach plant. o Completed April 2013 o Cost-—$40,000 Page 10 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 Table 1 Color Team Capital and Maintenance Projects 2010 - Forward Year Project Description and Cost Information for Capital Projects 2013 West White Liquor Storage Tank shell replacement/repairs. BMP sustaining measure and project related to TRW Recommendations regarding prevention of sewer-generated color—high pH white liquor. o Completed April 2013 o Cost- $122,000 West GB 2nd Effect pump upgrade. Obsolete pump replaced with different style to increase reliability and reduce downtime which in some cases can be attributed to increase color loading to the mill sewer system. o Completed April 2013 o Cost- $72,869 Mini-Hoods on No. 10 Smelt Dissolving Tank(SMDT). Allows substitution of weak wash for clean water in SMDT demister creating more process demand for weak wash and reducing high pH material discharged to sewer. Related to the weak wash purge strategy(Table 2) and TRW Recommendations regarding prevention of sewer-generated color—high pH. o Completed May 2013, cnsd* * cnsd—cost not separately determined, completed on operations and maintenance expense Table 2 Color Team BMP Refinements, Trials and Process Improvements 2010 forward Year(s) Refinement, Trial and/or Improvement 2010 Weak wash purge strategy to minimize potential sewer-generated color on-going during process upset, outage or reduced pulp mill production when demand for weak wash is out of balance with supply in causticizing. 2011 When both fiberlines are down,process contents of one of the spill tanks through the evaporators to free up spill tank volume before starting up. Was used successfully during and after the May 2011 cold mill outage to minimize loss of dilute color material to the WWTP. Page 11 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 ------------------------- Table 2 Color Team BMP Refinements, Trials and Process Improvements 2010 forward Year(s) Refinement, Trial and/or Improvement 2011 Alternative polymer study by Chemtreat at WWTP. Compared against current polyamine polymer in use for batch treatment of black color materials. No difference in color performance. Existing batch treatment polyamine polymer was retained. 2011 West GB Evaporator partial boil out strategy. Ability to clean process during on-going short outages as opportunity arises. Improves process reliability and reduces volume of color material to recover during outages. 2012 Reliability focus - 7 to 8 week planned maintenance outage cycle for on-going recovery furnaces and fiberlines. Prior to 2012,planned outage cycle was 10 to 12 weeks and additional unplanned outages were often necessary. Mill experience is that more frequent planned outages result in more reliable process operation between outages and lower color. Color associated with planned outages is also generally lower than color associated with an unplanned outage. 2012 Color prevention MOC/pre-task review process for outage and maintenance on-going tasks associated with black liquor. This is in addition to the permit-required review of modifications to systems managing black liquor,turpentine and soap. In 2012 and in 2013, the Color Team has focused on the reliability of the Recovery Furnaces and Fiberlines. When the mill experiences a process upset, and in particular an upset requiring an unplanned outage to correct, effluent color is not as good. The team targeted planned maintenance outages every seven to eight weeks. The frequency of outage work allows mill operations to stay ahead of potential issues that could necessitate an unplanned outage. Fewer unplanned outages and shorter periods of downtime help the mill maintain steady operations leading to better color performance. Page 12 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 --------------------------------------------------------------- V. TRW Recommendations The Canton Mill continues to evaluate and improve existing BMPs and reduce opportunities for sewer generated color, which historically, has been associated with high alkali material mixing with acidic materials. In 2012, the mill focused on removing contributions of white and green liquors from the mill sewer system through repairs to the West White, West Green and South Green Liquor Tanks. This included taking the tanks out of service, cleaning them and then proceeding with repairs that could not be done during normal operation. The West Green Liquor Tank is located inside the West Unoxidized Black Liquor Compound. As part of the BMP sustaining measures, the compound was cleaned, sealed and lined to reinstate the integrity of the containment and sump preventing losses of both green and black liquors. A practice put into place in 2010 included a weak wash purge strategy reducing the amount sent to the mill sewer system by installation of mini-hoods on the#11 Recovery Boiler smelt dissolving tank. This practice allowed operators to substitute weak wash for clean water in the dissolving tank demister. This created more process demand for weak wash material and reduced the amount discharged to the mill sewer. During the spring semi-annual outage, the#10 Recovery Boiler smelt dissolving tank hoods were replaced increasing the demand and further reducing the amount purged to the mill sewer system. Page 13 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 Reduction in black liquors to the mill sewer remains a priority. Two black liquor tank repair projects were initiated in the fall of 2012. The West GB Feed Tank and Skim Tank were taken out of service, cleaned and repaired. The floor drains in the #10 Recovery Boiler were also replaced. The replacement of these drains allowed black liquor material to be transferred to spill collection tanks instead of the mill sewer system. Although, the material would have ultimately been processed through the area sump system,by allowing the material to be transferred through piping it prevents dilution prior to reaching the sump. Improvements to the mill sewer monitoring system included the relocation of the#513 sewer conductivity meter and sampler. Previous monitoring results indicated that the location received high amounts of solids which periodically would block the flow to the probe. By relocating the probe upstream, this improved BMP monitoring and collection of daily samples for analysis. VI. Color Perception Study on the PilZeon River In July 2010, Cocke County, Tennessee and a coalition of environmental groups, represented by the Southern Environmental Law Center (SELC), filed a Petition for Contested Case in the NC Office of Administrative Hearings (OAH) — 10 EHR 4341, challenging color and temperature limits in the May 2010 NPDES permit. The Petitioners also filed a second Petition for Contested Case challenging the revised Color Page 14 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 Variance for the Canton Mill — 10 EHR 4982. The two cases were consolidated in October 2010. Discovery in the Contested Cases was conducted from October 2010 through June 2011. Dispositive motions were filed in July 2011. A hearing on dispositive motions was held in Haywood County, North Carolina on September 30, 2011. Following that hearing, Adminstrative Law Judge (ALJ) Randall May entered an order dismissing all but one of the Tennessee Petitioners. The Contested Cases where scheduled for administrative hearing in April 2012. Discussions between Evergreen legal counsel and legal counsel for the NC DWQ and the SELC began in January 2012 and resulted in a Partial Settlement [OAH 2O12] to the Constested Cases on April 24, 2012. A copy of the agreement is attached in Appendix C. In the Partial Settlement, Evergreen Packaging agreed to fund a Color Perception Study on the Pigeon River in North Carolina, as outlined in the EPA letter of February 22, 2010 objecting to the December 2009 Draft NPDES permit proposed by the NC DWQ for the Canton Mill. Evergreen Packaging, the NC DWQ and the petitioners agreed to stay the hearing on color issues in the Contested Cases until 2013 after completion of the Color Perception Study.. Page 15 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 --------------------------------------------------------------- On February 20, 2012 Evergreen Packaging submitted a Color Perception Study Plan to the NC DWQ. The DWQ coordinated review of the plan with the EPA. After several rounds of comments and revisions, the plan was approved. The Color Perception Study Plan revision dated April 17, 2012 [Evergreen 2012c] was approved by the DWQ on June 1, 2012. A copy of the approved study plan is attached in Appendix D. The cost to complete the approved Color Preception Study is on the order of approximately $200,000 USD. The study took place during the months of June, September and November, 2012. The study was conducted by Dr. Albert Prestrude and Dr. Don Cherry of Virginia Tech University. Approximately 30 observers were recruited for each event in the study. Each participant was asked to give an opinion, in the form of ratings for color, clarity, scenic beauty and secondary recreation, for both upstream and downstream. The observers, for all events, were first taken to the North Carolina / Tennessee stateline where they began their observations and then ended at a point above the Canton Mill. There were a total of eight observation sites along the river. A report of the Study was submitted to DWQ in January, 2013. In response to DWQ comments, the report was amended and supplemented in March. Evergreen and Drs. Cherry and Prestrude are working on a final revision of the report in response to additional DWQ comments. The report should be submitted to DWQ in early July, 2013. Page 16 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 --------------------------------------------------------------- VII. Summary Prevention of effluent color is a priority for Canton Mill operations every day. The Canton Mill's focus on process reliability and uptime has resulted in the mill's best annual color performance to date. The Canton Mill will continue to utilize the processes and practices proven successful for wastewater effluent color prevention. Page 17 July 2013 — Annual Progress Report on Color Blue Ridge Paper Products Inc. dba Evergreen Packaging Canton,North Carolina NPDES Permit No. NC0000272 --------------------------------------------------------------- REFERENCES EKONO 2005 — Environmental Performance, Regulations and Technologies in the Pulp and Paper Industry, EKONO Inc, August 2005. Evergreen 2011 — Annual Progress Report on Color, submitted to NC DWQ to meet requirements of Part I A.(8) item 8 of the May 2010 NPDES Permit, Evergreen Packaging, July 1, 2011. Evergreen 2012a — February 2012 Update to the Color Reduction Implementation Plan, submitted to NC DWQ to meet requirements of Part I A.(8) item 11 of the May 2010 NPDES Permit, Evergreen Packaging, February 20, 2012. Evergreen 2012b — Response to EPA Comments dated 22 March 2012 concerning February 2012 Update to the Color Reduction Implementation Plan, letter to NC DWQ Complex NPDES Permitting Unit from Evergreen Packaging dated April 10, 2012. Evergreen 2012c — April 2012 Color Perception Study Plan and Response to EPA Comments dated 28 March 2012 concerning the March 2012 Revised Color Perception Study Plan, submitted to NC DWQ Complex NPDES Permitting Unit by Evergreen Packaging on April 17, 2012. Evergreen 2012d — Annual Progress Report on Color, submitted to NC DWQ to meet requirements of Part I A.(8) item 8 of the May 2010 NPDES Permit, Evergreen Packaging, July 1, 2012. NC OAH 2O12 — Partial Settlement Agreement and Joint Stipulation to Stay, 10 EHR 4341 and 10 EHR 4982, North Carolina Office of Administrative Hearings, April 24, 2012. NCASI 2006—Technical Bulletin No. 919 —Review of Color Control Technologies and Their Applicability to Modern Kraft Pulp and Paper Mill, National Council for Air and Stream Improvement, August 2006. Page 18