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HomeMy WebLinkAboutNC0088226_Permit Modification_20100204North Carolina Beverly Eaves Perdue Governor Mr. Roger Smith ECS Carolinas, LLP 8702 Red Oak Boulevard, Suite A Charlotte, North Carolina 28217 Dear Mr. Smith: M doc' 61� ��,� NCDENR Department of Environment and Natural Resources Division of Water Quality Coleen H. Sullins Director Dee Freeman Secretary February 4, 2010 Subject: Final Permit Modification NPDES Permit NCO088226 Wachovia Tryon Street Mecklenburg County Division personnel have reviewed and approved your request (dated December 2, 2009) to modify the subject permit. Accordingly, we are forwarding the attached NPDES discharge permit. This permit is issued pursuant to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North Carolina and the U.S. Environmental Protection Agency dated October 15, 2007 (or as subsequently amended). This modified permit includes the following changes from your current permit: Re -Route of Wastewater from NCO086886 (The Green at Wachovia) to NCO088226 (Wachovia Tryon Street). Wachovia Tryon will serve as a combined discharge for the two groundwater/dewater systems. Per your submission, the combined treated wastewater will be used for on -site needs such as cooling towers, and when the site is fully occupied and operational, the system will be designed to use up to 100% of the treated groundwater captured from both sites with little to no discharge to the outfall. However, in the short-term it is anticipated that there will be excess water which will require intermittent discharge to surface waters. Per our phone discussion, the proposed treatment system will include RO units, but any RO reject will be sent to the Charlotte -Mecklenburg Utilities (CMU) sanitary sewer, since Division permitting policies do not allow for discharge of RO reject to freshwaters given the likely toxicity. The subject NPDES permit will retain Effluent Sheet A.1 for the existing discharge, and a new Effluent Sheet A.2 has been added for the combined discharge. Contaminants of concern for each discharge have been combined into the A.2 Effluent Sheet for the combined discharge. Effluent limitations have also been updated to reflect changes to EPA surface water quality criteria and/or North Carolina water quality standards. Authorization to Construct Permit. You will need to obtain an Authorization to Construct (ATC) permit from DWQ/Construction Grants and Loans prior to constructing the proposed groundwater 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Location: 512 N, Salisbury St. Raleigh, North Carolina 27604 One Phone: 919-807-63001 FAX: 919-807-64921 Customer Service: 1-877-623-6748 NorthCarolina Internet: www.ncwaterquality.org Natmally An Equal Oppertunily � aRnnarmafive Action Employe - A 1 treatment system. Effluent Sheet A.2 for the combined discharge will become effective after an Engineer's Certificate for completion of the treatment system construction is submitted. Miscellaneous. Following project completion, you should request rescission of permit NCO086886 (The Green at Wachovia), otherwise you will be subject to annual fees and reporting requirements for that permit. Please note that permit renewal applications for both permits are due no later than January 1, 2010, and a renewal letter was already mailed to the permittee on October 21, 2009. Failure to renew by this date may result in civil penalty assessments. Finally, if you achieve 100% reuse in the future with no further need for an NPDES discharge permit, you might want to evaluate conversion to a DWQ recycle permit, which is issued by Aquifer Protection/Land Application Unit. If any parts, measurement frequencies or sampling requirements contained in this modification are unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty (30) days following receipt of this letter. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699- 6714). Unless such demand is made, this decision shall be final and binding. Please note that this permit is not transferable except after notice to the Division. The Division may require modification or revocation and reissuance of the permit. This permit does not affect the legal requirements to obtain other permits which may be required by the Division or permits required by the Division of Land Resources, the Coastal Area Management Act or any other Federal or Local governmental permit that may be required. If you have any questions concerning this permit, please contact me at (919) 807-6390. 5erelWnic Be Supervisor, NPDES West Program Hardcopy: NPDES File NCO088226 Central File NCO088226 Mr. Allen Holloway, Wachovia Bank, 301 South College Street, Suite 2800, Charlotte NC 28202 DWQ/MRO SWP Email copy: Mecklenburg County DWQ Aquatic Toxicology 1617 Mail Service Center, Ralegh, North Carolina 27699-1617 Location: 512 N. Salisbury St. Ralegh, North Carolina 27604 One Phone: 919-807-63001 FAX: 919-80764921 Customer Service: 1-877623-6748 NorthCarc lina Internet: pporUnxaterqualtiveAc Naturallrf An Equal OpDonunily 1 Affirmative Action Employer Pemit NCO088226 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards and regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the Federal Water Pollution Control Act, as amended, Wachovia Bank, N.A. is hereby authorized to discharge wastewater from a facility located at Wachovia Tryon Street 500 Block of South Tryon Street Charlotte, North Carolina Mecklenburg County to receiving waters designated as an unnamed tributary to Little Sugar Creek in the Catawba River Basin in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III and IV hereof. This permit shall become effective March 1, 2010. This permit and authorization to discharge shall expire at midnight on June 30, 2010. Signed this day February 4, 2010. 4(�M een H. Sullins, Director Division of Water Quality By Authority of the Environmental Management Commission Permit NCO088226 W L SUPPLEMENT TO PERMIT COVER SHEET All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked. As of this permit issuance, any previously issued permit bearing this number is no longer effective. Therefore, the exclusive authority to operate and discharge from this facility arises under the permit conditions, requirements, terms, and provisions included herein. Wachovia Bank, N.A. is hereby authorized to: 1. Discharge dewatering water from a project located at 500 Block of South Tryon Street, Charlotte, Mecklenburg County. 2. After receiving an Authorization to Construct permit, re-route wastewater from The Green at Wachovia (formerly permitted separately under NPDES permit NC0086886) and construct and operate a 0.087 MGD combined groundwater treatment system. 3. Discharge from said treatment works at the location specified on the attached map into an unnamed tributary to Little Sugar Creek, currently classified C waters in subbasin 03-08-34 of the Catawba River Basin. Permit NCO088226 A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS During the period beginning on the effective date of the permit and lasting until expiration or receipt of Engineer's Certificate for a combined discharge treatment system, the Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: PARAMETER LIMITS MONITORING REQUIREMENTS Monthly Average Daily Maximum Measurement Frequency Sample Type Sample Location' Flow Monthly Meter Effluent Total Suspended Solids- 30.0 mg/L Monthly Grab Effluent Oil and Grease2 Monthly Grab Effluent Benzene 51 µg/L Monthly Grab Effluent Toluene 11.0 µg/L Monthly Grab Effluent Ethylbenzene 520 µg/L Monthly Grab Effluent Total Xylenes 780 µg/L Monthly Grab Effluent Methyl Tert Butyl Ether MTBE Monthly Grab Effluent Lead3 Monthly Grab Effluent 1,2 Dichloroethane4 Monthly Grab Effluent Napthalene4 78 µg/L Monthly Grab Effluent n-Butylbenzene 3 µg/L Monthly Grab Effluent Chronic Toxicitys Quarterly Grab Effluent Notes: 1. All "effluent" samples shall be collected after the point of convergence of all dewatering streams and prior to the point of connection with the storm sewer. 2. The grab sample for oil and grease should be skimmed from the surface in a quiescent zone, such as a holding tank, if possible. 3. If lead is detected at 25 µg/L or lower during the first eight sampling events, lead monitoring is no longer required and may be discontinued for the remainder of the permit term. If lead is detected at > 25.0 µg/L during any of the first eight sampling events, lead monitoring must be continued for the remainder of the permit term. 4. If this pollutant is not detected above method detection limits during the first eight sampling events, then monitoring is no longer required and may be discontinued for the remainder of the permit term. If the pollutant is detected during any of the first eight sampling events, monitoring must continue for the remainder of the permit term. 5. Chronic Toxicity (Ceriodaphida) P/F at 90%; March, June, September, and December [see A. (3)]. There shall be no discharge of floating solids or foam visible in other than trace amounts. Permit NCO088226 A. (2) EFFLUENT LIMITATIONS AND MONITORING. REQUIREMENTS . During the period beginning upon receipt of Engineer's Certificate for completion of a combined discharge treatment system and lasting until permit expiration, the Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: PARAMETER LIMITS MONITORING REQUIREMENTS Monthly Average Daily Maximum Measurement Frequency Sample Type Sample Location' Flow 0.087 MGD Continuous2 Meter Effluent Total Suspended Solids 30.0 mg/L Monthly Grab Effluent Oil and Grease3 Monthly Grab Effluent Benzene 51 µg/L Monthly Grab Effluent Toluene 11.0 µg/L Monthly Grab Effluent Ethylbenzene 520 µg/L Monthly Grab Effluent Total Xylenes 780 µg/L Monthly Grab Effluent Methyl Tert-Butyl Ether MTBE Monthly Grab Effluent Lead4 25 ug/l Monthly Grab Effluent 1,2 Dichloroethane4 37 ug/1 Monthly Grab Effluent Napthalene4 78 µg/L Monthly Grab Effluent n-Buhylbenzene 3 µg/L Monthly Grab Effluent Chloroform Monthly Grab Effluent Tetrachloroethene Monthly Grab Effluent Trichloroethene Monthly Grab Effluent Zinc Monthly Grab Effluent Chronic Toxicitys Quarterly Grab Effluent Notes: 1. All "effluent" samples shall be collected after the point of convergence of all dewatering streams and prior to the point of connection with the storm sewer. 2. If discharge is not continuous, flow may be monitored weekly by an instantaneous flow estimate. 3. The grab sample for oil and grease should be skimmed from the surface in a quiescent zone, such as a holding tank, if possible. 4. If this pollutant is not detected above method detection limits during the first eight sampling events, then monitoring is no Ionger required and may be discontinued for the remainder of the permit term. If the pollutant is detected during any of the first eight sampling events, monitoring must continue for the remainder of the permit term. 5. Chronic Toxicity (Ceriodaphnia) P/F at 90%; March, June, September, and December [see A. (3)]. Permit NCO088226 . A. (3) CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QUARTERLY) The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia dubia at an effluent concentration of 90%. The permit holder shall perform at a minimum, uag rterlt monitoring using test procedures outlined in the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. The tests will be performed during the months March, June, September, and December. Effluent sampling for this testing shall be performed at the NPDES permitted final effluent discharge below all treatment processes. If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit limit, then multiple -concentration testing shall be performed at a minimum, in each of the two following months as described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. The chronic value for multiple concentration tests will be determined using the geometric mean of the highest concentration having no detectable impairment of reproduction or survival and the lowest concentration that does have a detectable impairment of reproduction or survival. The definition of "detectable impairment," collection methods, exposure regimes, and further statistical methods are specified in the "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Form (MR-1) for the months in which tests were performed, using the parameter code TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the following address: Attention: North Carolina Division of Water Quality Environmental Sciences Section 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Section no later than 30 days after the end of the reporting period for which the report is made. Test data shall be complete, accurate, include all supporting chemical/physical measurements and all concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream. Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility name, permit number, pipe number, county, and the month/year of the report with the notation of "No Flow" in the comment area of the form. The report shaII be submitted to the Environmental Sciences Section at the address cited above. Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be required during the following month. Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water Quality indicate potential impacts to the receiving stream, this permit may be re -opened and modified to include alternate monitoring requirements -or limits. If the Permittee monitors any pollutant more frequently then required by this permit, the results of such monitoring shall be included in the calculation & reporting of the data submitted on the DMR & all AT Forms submitted. NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an invalid test and will require immediate follow-up testing to be completed no later than the last day of the month following the month of the initial monitoring. Belnick, Tom From: McCulloch, John [John.McCulloch@mecklenburgcountync.gov] Sent: Monday, December 14, 2009 2:12 PM To: Belnick, Tom; Moore, Meredith Cc: Krebs, Rob; Allocco, Marcia; Robertson, Seth Subject: RE: NCO088226 Permit Mod- Wachovia Tryon Tom, I reviewed the draft and spoke with our inspector about the modifications. We are CK with the modifications and the inspector (Jeff Mitchell) said it should be an improvement. John McCulloch Environmental Supervisor Mecklenburg County Water and Land Resources 70o North Tryon Street, Charlotte, NC 28202 Phone: 704-336-5455 Fax: 7o4-336-439L From: Belnick, Tom [mailto:tom.belnick@ncdenr.gov] Sent: Monday, December 14, 2009 12:11 PM To: Moore, Meredith; McCulloch, John Cc: Krebs, Rob; Allocco, Marcia; Robertson, Seth Subject: NCO088226 Permit Mod- Wachovia Tryon Meredith/John- I've attached a proposed NPDES permit mod for the subject permit located in Mecklenburg County. The modification proposes a combining of two outfalls into a single discharge of treated groundwater. Please provide any comments by 1/16/2010. Seth -This modification will ultimately come to CG&Lfor an ATC permit for the proposed groundwater treatment system. Rob/Marcia- fyi. Send me any comments. Tom Belnick Supervisor, NPDES West Program NC DENR/Division of Water Quality 1617 Mail Service Center, Raleigh, NC 27699-1617 (919) 807-6390; fax (919)807-6495 E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. The Charlotte Observer Publishing Co. Charlotte, NC North Caro Lina } ss Affidavit of Publication MeckLenburg County} THE CHARLOTTE OBSERVER DINA SPRINKLE NCDENR/DWQ/POINT SOURCE BRANCH 1617 MAIL SERVICE CENTER RALEIGH NC 27699 REFERENCE: 30063432 6420688 multi -permit request Before the undersigned, a Notary PubLic of said County and State, duly authorized to administer oaths affirmations, etc., personally appeared, being du Ly sworn or affirmed according to Law, doth depose and say that he/she is a representative of The Charlotte Observer Publishing Company, a corporation organized and doing business under the laws of the State of DeLaware, and pubLishing a newspaper known as The Charlotte Observer in the city of Charlotte, County of MeckLenburg, and State of North Carolina and that as such he/she is familiar with the books, records, files, and business of said Corporation and by reference to the files of said publication, the attached advertisement was inserted. The following is correctly copied from the books and files of the aforesaid Corporation and Publication. I Public Nolte Noah Caroline Environmental Maaagement CommesionlNPCEs Unit 1617 Mail Service Canter ' Raleigh, NC P7699,1617 ,. Notice of Initial to Issue a NPOES weetayater Parmt The Noah Carolina Emiionmenlel Management Commission proposes to is9ue a NPOES waaa.1.1 Eivenarge ,ernft to the Panatela) Wool tops.; n PUBLISHED ON: 12/18 AD SPACE: 96 LINE FILED ON:M 12/25/09 NAME: /"/K10�Q]L� '� TITLE: G �! DATE: In Testimony Whereof I have hereunto set my hand and affixed my seal, the day and'y r aforesaid.% Notary y Commission Expires: My Commission Expires May 27, 2011 renewal Of perms NC6078 1 Wn P in Uncoln county; tlomesl p wa9leweler m Romey of NCDENR North Carolina Department of Environment and Natural Resources Division of Water Quality Beverly Eaves Perdue Governor Mr. Roger Smith ECS Carolinas, LLP 8702 Red Oak Boulevard, Suite A Charlotte, North Carolina 28217 Dear Mr. Smith: Coleen H. Sullins Director December 16, 2009 Subject: Draft Permit Modification NPDES Permit NCO088226 Wachovia Tryon Street Mecklenburg County Dee Freeman Secretary On behalf of Wachovia Bank, N.A., you submitted a request for permit modification (dated December 2, 2009) for the subject NPDES permit. Enclosed with this letter is a copy of the draft modified pages of your current NPDES permit. This draft permit modification includes the following highlights: Re -Route of Wastewater from NCO086886 (The Green at Wachovia) to NCO098226 (Wachovia Tryon Street). Wachovia Tryon will serve as a combined discharge for the two groundwater/dewater systems. Per your submission, the combined treated wastewater will be used for on -site needs such as cooling towers, and when the site is fully occupied and operational, the system will be designed to use up to 100% of the treated groundwater captured from both sites with little to no discharge to the outfall. However, in the short-term it is anticipated that there will be excess water which will require intermittent discharge to surface waters. Per our phone discussion, the proposed treatment system will include RO units, but any RO reject will be sent to the Charlotte -Mecklenburg Utilities (CMU) sanitary sewer, since Division permitting policies do not allow for discharge of RO reject to freshwaters given the likely toxicity. The subject NPDES permit will retain Effluent Sheet A.1 for the existing discharge, and a new Effluent Sheet A.2 has been added for the combined discharge. Contaminants of concern for each discharge have been combined into the A.2 Effluent Sheet for the combined discharge. Effluent limitations have also been updated to reflect changes to EPA surface water quality criteria and/or North Carolina water quality standards. Authorization to Construct Permit. You will need to obtain an Authorization to Construct (ATC) permit from DWQ/Construction Grants and Loans prior to constructing the proposed groundwater treatment system. Effluent Sheet A.2 for the combined discharge will become effective after an Engineer's Certificate for completion of the treatment system construction is submitted. 1617 Mail Service Center, Raleigh, Noith Carolina 27699-1617 Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 One Phone: 919-807-63001 FAX: 9IM07-64921 Customer Service: 1-877-623 6748 NofthCarohna Internet: www.ncwateryuality.org NaturalM / An Equal OpF*rtunity 1 Affirmative Action Employer Miscellaneous. Following project completion, you should request rescission of permit NCO086886 (The Green at Wachovia), otherwise you will be subject to annual fees and reporting requirements for that permit. Please note that permit renewal applications for both permits are due no later than January 1, 2010, and a renewal letter was already mailed to the permittee on October 21, 2009. Failure to renew by this date may result in civil penalty assessments. Finally, if you achieve 100% reuse in the future with no further need for an NPDES discharge pen -nit, you might want to evaluate conversion to a DWQ recycle permit, which is issued by Aquifer Protection/Land Application Unit. Please submit any comments to me no later than thirty days following your receipt of this draft permit modification. This draft permit modification will also be noticed in a public newspaper with a 30 day public comment period. If you have any questions about the NPDES permit process, please contact me at 919-807-6390 or via email at tom.belnick@ncdenr.gov. Si erely, T m Bel ick upervisor, NPDES West Program Hardcopy: NPDES File NCO088226 Mr. Allen Holloway, Wachovia Bank, 301 South College Street, Suite 2800, Charlotte NC 28202 Email copy: Mecklenburg County DWQ/MRO SWPS DWQ/CG&L 1617 Mail Service Center, Ralegh, North Carolina 27699-1617 Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 One Phone: 91M07-63001 FAX: 919-807-64921 Customer Service: 1-877-623-6748 NorthCarolina Internet! wvnN.nnity eA r ality.o c Nationally 1► a tiNry l y An Equal ppporlunily9 Affirmative Action Employer li/ �/ l l {1�" Permit NCO088226 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY PERMIT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards and regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the Federal Water Pollution Control Act, as amended, Wachovia Bank, N.A. is hereby authorized to discharge wastewater from a facility located at Wachovia Tryon Street 500 Block of South Tryon Street Charlotte, North Carolina Mecklenburg County to receiving waters designated as an unnamed tributary to Little Sugar Creek in the Catawba River Basin in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III and IV hereof. This permit shall become effective Month xx, xxxx. This permit and authorization to discharge shall expire at midnight on June 30, 2010. Signed this day Month xx, xxxx. DRAFT Coleen H. Sullins, Director Division of Water Quality By Authority of the Environmental Management Commission Permit NCO088226 SUPPLEMENT TO PERMIT COVER SHEET All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked. As of this permit issuance, any previously issued permit bearing this number is no longer effective. Therefore, the exclusive authority to operate and discharge from this facility arises under the permit conditions, requirements, terms, and provisions included herein. Wachovia Bank, N.A. is hereby authorized to: 1. Discharge dewatering water from a project located at 500 Block of South Tryon Street, Charlotte, Mecklenburg County. 2. After receiving an Authorization to Construct permit, re-route wastewater from The Green at Wachovia (formerly permitted separately under NPDES permit NC0086886) and construct and operate a 0.087 MGD combined groundwater treatment system. 3. Discharge from said treatment works at the location specified on the attached map into an unnamed tributary to Little Sugar Creek, currently classified C waters in subbasin 03-08-34 of the Catawba River Basin. Permit NCO088226 - A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS During the period beginning on the effective date of the permit and lasting until expiration or receipt of Engineer's Certificate for a combined discharge treatment system, the Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: PARAMETER LIMITS MONITORING REQUIREMENTS Monthly Average Daily Maximum Measurement Frequency Sample Type Sample Location' Flow Monthly Meter Effluent Total Suspended Solids 30.0 mg/L Monthly Grab Effluent Oil and Grease2 Monthly Grab Effluent Benzene 51 µg/L Monthly Grab Effluent Toluene 11.0 µg/L Monthly Grab Effluent EthyIbenzene 520 µg/L Monthly Grab Effluent Total Xylenes 780 µg/L Monthly Grab Effluent Methyl Tert Butyl Ether MTBE Monthly Grab Effluent Lead3 , Monthly Grab Effluent 1,2 Dichloroethane4 Monthly Grab Effluent Napthalene4 78 µg/L Monthly Grab Effluent n-Butylbenzene 3 µg/L Monthly Grab Effluent Chronic Toxicitys Quarterly Grab Effluent Notes: 1. All "effluent" samples shall be collected after the point of convergence of all dewatering streams and prior to the point of connection with the storm sewer. 2. The grab sample for oil and grease should be skimmed from the surface in a quiescent zone, such as a holding tank, if possible. 3. If lead is detected at 25 µg/L or lower during the first eight sampling events, lead monitoring is no longer required and may be discontinued for the remainder of the permit term. If lead is detected at > 25.0 µg/L during any of the first eight sampling events, Iead monitoring must be continued for the remainder of the permit term. 4. If this pollutant is not detected above method detection limits during the first eight sampling events, then monitoring is no longer required and may be discontinued for the remainder of the permit term. If the pollutant is detected during any of the first eight sampling events, monitoring must continue for the remainder of the permit term. 5. Chronic Toxicity (Ceriodaphnia) P/F at 90%; March, June, September, and December [see A. (3)]. There shall be no discharge of floating solids or foam visible in other than trace amounts. Pemnit NCO088226 A. (2) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS During the period beginning upon receipt of Engineer's Certificate for completion of a combined discharge treatment system and lasting until permit expiration, the Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: PARAMETER LIMITS MONITORING REQUIREMENTS Monthly Average Daily Maximum Measurement Frequency Sample Type Sample Location' Flow 0.087 MGD Continuous2 Meter Effluent Total Suspended Solids 30.0 mg/L Monthly Grab Effluent Oil and Grease3 Monthly Grab Effluent Benzene 51 µg/L Monthly Grab Effluent Toluene 11.0 µg/L Monthly Grab Effluent Ethylbenzene 520 µg/L Monthly Grab Effluent Total Xylenes 780 jig/ L Monthly Grab Effluent Methyl Tert-Butyl Ether MTBE Monthly Grab Effluent Lead4 25 ug/1 Monthly Grab Effluent 1,2 Dichloroethane4 37 ug/1 Monthly Grab Effluent Napthalene4 78 µg/L Monthly Grab Effluent n-Butylbenzene 3 µg/ L Monthly Grab Effluent Chloroform Monthly Grab Effluent Tetrachloroethene Monthly Grab Effluent Trichloroethene Monthly Grab Effluent Zinc Monthly Grab Effluent Chronic Toxicitys Quarterly Grab Effluent Notes: 1. All "effluent" samples shall be collected after the point of convergence of all dewatering streams and prior to the point of connection with the storm sewer. 2. If discharge is not continuous, flow may be monitored weekly by an instantaneous flow estimate. 3. The grab sample for oil and grease should be skimmed from the surface in a quiescent zone, such as a holding tank, if possible. 4. If this pollutant is not detected above method detection limits during the first eight sampling events, then monitoring is no longer required and may be discontinued for the remainder of the permit term. If the pollutant is detected during any of the first eight sampling events, monitoring must continue for the remainder of the permit term. 5. Chronic Toxicity (Ceriodaphnia) P/F at 90%; March, June, September, and December [see A. (3)]. Pernut NCO088226 - A. (3) CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QUARTERLY) The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to CoHodaphnia dubia at an effluent concentration of 90%. The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. The tests will be performed during the months March, June, September, and December. Effluent sampling for this testing shall be performed at the NPDES permitted final effluent discharge below all treatment processes. If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit limit, then multiple -concentration testing shall be performed at a minimum, in each of the two following months as described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. The chronic value for multiple concentration tests will be determined using the geometric mean of the highest concentration having no detectable impairment of reproduction or survival and the lowest concentration that does have a detectable impairment of reproduction or survival. The definition of "detectable impairment," collection methods, exposure regimes, and further statistical methods are specified in the "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Form (MR-1) for the months in which tests were performed, using the parameter code TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the following address: Attention: North Carolina Division of Water Quality Environmental Sciences Section 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Section no later than 30 days after the end of the reporting period for which the report is made. Test data shall be complete, accurate, include all supporting chemical/physical measurements and all concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream. Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility name, permit number, pipe number, county, and the month/year of the report with the notation of "No Flow" in the comment area of the form. The report shall be submitted to the Environmental Sciences Section at the address cited above. Should the pernttee fail to monitor during a month in which toxicity monitoring is required, monitoring will be required during the following month. Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water Quality indicate potential impacts to the receiving stream, this permit may be re -opened and modified to include alternate monitoring requirements or limits. If the Permittee monitors any pollutant more frequently then required by this permit, the results of such monitoring shall be included in the calculation & reporting of the data submitted on the DMR & all AT Forms submitted. NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an invalid test and will require immediate follow-up testing to be completed no later than the last day of the month following the month of the initial monitoring. -,�r��� Mod— ��a�,•/ "tole.) Jen� 12/iy�o9� Belnick, Tom From: Belnick, Tom Sent: Monday, December 14, 2009 12:11 PM To: 'meredith.moore@mecklenburgcountync.gov;'john.mcculloch@mecklenburgcountync.gov' Cc: Krebs, Rob; Allocco, Marcia; Robertson, Seth Subject: NCO088226 Permit Mod- Wachovia Tryon Attachments: NCO088226 Draft Mod 2009.pdf; NCO088226 Draft Mod Cover Letter 2009.pdf Meredith/John- I've attached a proposed NPDES permit mod for the subject permit located in Mecklenburg County. The modification proposes a combining of two outfalls into a single discharge of treated groundwater. Please provide any comments by 1/16/2010. Seth- This modification will ultimately come to CG&L for an ATC permit for the proposed groundwater treatment system. Rob/Marcia- fyi. Send me any comments. Tom Belnick Supervisor, NPDES West Program NC DENR/Division of Water Quality 1617 Mail Service Center, Raleigh, NC 27699-1617 (919) 807-6390; fax (919) 807-6495 E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. 1 LLP nrca� �nJns ECS CAROLINAS, LLP Geotechnical • Construction Materials • Environmental December 2, 2009 CERTIFIED MAIL # 7009-1410-0000-8374-3412 RETURN RECEIPT REQUESTED Mr. Tom Belnick North Carolina Department of Environment and Natural Resources Division of Water Quality / NPDES Unit 1617 Mail Service Center Raleigh, North Carolina 27699-1617 Reference: Permit Modification Fee Wachovia Tryon Street BTS (Duke Energy Center) NPDES Permit No.: NCO088226 500 Block of South Tryon Street Charlotte, Mecklenburg County, North Carolina ECS Project No. 08-3515H Dear Mr. Belnick: ECS Carolinas, LLP (ECS), on behalf of Wachovia Bank, N.A., is submitting the enclosed check in the amount of $260.00 for the Major Permit Modification Fee for the above referenced NPDES Permit. This fee is in accordance with our telephone conversation and subsequent email yesterday. If there are questions regarding the enclosed, or a need for further information, please contact us at (704) 525-5152. Respectfully submitted, ECS CAROOLLIINAS, LLP Roger A. Smith, P.G. Principal Geologist Enclosure: check no. 3381 Cc: Mr. Allen Holloway - Childress Klein (no attachment) Ms. Lisa Latham - Childress Klein (no attachment) R IVE D DEC - 3 2009 DENR - \`.!^Tr_r2 QUALITY POINT SOURCE BRANCH 8702 Red Oak Boulevard, Suite A, Charlotte, North Carolina 28217 •704-525-5152 • Fax: 704.525-7178 • www.eeslimited.com z Belnick, Tom From: Belnick, Tom Sent: Tuesday, December 01, 2009 4:21 PM To: 'RSmith3' Cc: Krebs, Rob Subject: RE: Wachovia NPDES Permit Mod Roger- DWQ received your application for permit modification on 11/13/2009. Following a quick review, I noticed a proposed RO treatment system, and left a phone message with you about potential issues with an RO discharge to freshwater streams. Per our phone conversation today and your subsequent email, it appears that you have an agreement with CMU to accept any RO reject from this proposed project to their sanitary system. Consequently, DWQ will proceed to modify the NCO088226 permit (Wachovia Tryon) to accept the reroute of wastewater from NCO086886 (The Green at Wachovia). This will eliminate one discharge (NCO086886), and the treated combined discharge from NCO088226 will be composed of non-RO wastewater. This permit mod will need to be public noticed for 30-day public comment, and I indicated this will require a permit modification fee of $260. Following this permit modification, you should formally request rescission of permit NCO086886, so that annual fees and permit renewal requirements are no longer in force for that discharge. Let me know if you have further questions. Tom Belnick Supervisor, NPDES West Program NC DENR/Division of Water Quality 1617 Mail Service Center, Raleigh, NC 27699-1617 (919) 807-6390; fax (919) 807-6495 E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. -----Original Message ----- From: RSmith3 [mailto:RSmith3@ecslimited.com] Sent: Tuesday, December 01, 2009 3:30 PM To: Belnick, Tom Cc: Lisa Latham Subject: FW: Wachovia NPDES Permit Mod Tom, Per conversation, attached is the letter from Charlotte Mecklenburg Utilities Department accepting the RO reject water. Please feel free to contact me with any questions. Roger A. Smith, P.G., R.B.P. Principal Geologist Manager, Environmental Services ECS Carolinas, LLP 8702 Red Oak Boulevard, Suite A, Charlotte, NC 28217 T: 704-525-5152 D: 704-319-7806 F: 704-525-7178 C: 704-634-8067 RSmith3(a@ecslimited.com * www.ecslimited.com 1 Ranked in ENR's Top Design Firms This message, including any attachment hereto, is confidential and proprietary. If you are ' not the named recipient, you are kindly requested to notify the sender immediately and to delete this message, including any attachment, from your system. You are not allowed to copy, use, or maintain this message, and the contents hereof must not be disclosed to any other person. -----Original Message --- From: Alissa [mailto:aallman@ecslimited.com] Sent: Tuesday, December 01, 2009 03:33 pm To: RSmith3 Subject: This E-mail was sent from "RNPBACD81" (Aficio MP 7500). Scan Date: 12.01.2009 15:33:13 (-0500) 2 r - r CLT.ARLOT &-as August 1. 200B Llsa Latham Cell frt * Wein �'rcaer vs Mkt S. ��ofle��er ;�t srrfr� 2r:Ua Cha-lcite. W"' 2.62'012 Subjec-t: Retise of Ground-,vazer in the W=110-Aa First Street cooling tve-?ers Door Ms. I.sthan:_ YOU: re<1LlBSr Subi-nitted ry Ternpe-SL Environmental Systems; Inc. to discharge treated groundviater. for use lit :'+Iolcl)ovia's FirsL SAr-eel Project located at 550 Sout:h Tiyart Street, Charlotote. Nord. Carolina. is gfen:Wd i asotl tipon the ;olluixing informallmn and conditions, Thr: Spucial Use discharue to the sanitary sc WCr wilf- originate f rom .he use of treated coraaminated ground.ti':ater .as lriaRCUp hater fo. c:aolttlg toviers. This rt'wa result in hleeduff frr.►11"t th, rr;rsling trsvdCra and up to -55% of treated colitav rinated grou.1dwater heiny dl.solt3rged directly ttF 'xhe dtrrilt3ly setxi:r. It i4; ytat. l in ttte request Setter that Up, to 67,',94.0 galleris per day (qpd) of cgrcuad-w3ter v,+i l be putriped and. truatfud veith the ii-Mallo.d treatrnAnt 5y'o`t rn, It eves projectod tbat: 8,9,4 =fie qpId or 95% of this later will be re.c;overed for use AN MBkoup ► ,,-;rer in the cooling towers and the ruin-tir!Ang 5%. of -.the graundwatt;r or 4392 ,-ipi.-I will bu .:i c.horgeC: directly to the sanitary sewOr. All corgarnInated grountSwAter disc'aarye to the san-aary sewer shall be treater! :)r;fnre discharge, m v take pluay. Thie contaminated g'rl)Vridw-ater 'ia curromthe beitxg disrher9lid try Old stownwarer sewer under NPC•ES permit Na. WC0131567Z and tested. for tl,c: volatile organic,, chonlicals (VOC) snd other poliut5nts ftstud on the GI':113s provideJ. It vtas indica ed in the rt: uez'It le:tar that chronic toxicity had failed twice Niue to v latile organic cherni.cals. 'f"ho rernova, cite by the treatrttent s+estern, indicated in the request letter, for these c. OCs ;:ill bo gareater than 99%. The treatnient S%�St:enl of the fry ltt-wing rrl:;ui�+ttlent; {'l l fir atr�pf;or si�stern; ;1 ! 2eo"=1LE fell0 Systenlr ill Ard-Scalant DoSlnq Syrston't, f l l• Sodirim Meta-bisulfite F)osing syrstcm, 117, S�itr..-Filtrr3tica s Syster.1; i2't Reverse Otittiogis 130'j Systems, (4) Reofressurization Pu:1ypt; IZ lo'Vater N1e1ar,TOLi'-111Zer; (2'1 — 350 .jailm EQ Storage Tanks; i l; —2500 gallon EQ 'Storage Tank for feed to enrke system. A pros- ass lio+rr Jiflg'3rn and vi'rttur tr¢avrteat lay OUL p131? were sut;rnitt ed- with the request. rho,conditions for discharge of treated gio:Jnclwater to the sariluiry Sewer consist of t'te following.' {1 I 1-rs:a(IatiOrl enr rnainterl.ince of Charlott'e-f-ftCklenburq Uti.litieslCMUI approved vv ter teeters, 2l Opefation and triaalllten&llce of the trey anent system ronsistit)g of t ie equipment listed above %o the OC pararnatars listed in the regLiest letter and Cite NPl —FS perrt;it remain bztov\' NG 2L Ehresholds. ;,sty+ discharge, wi_hout permission, to the sanitary severer Pxreedsng the NC 2L lin ats of the VOC: paranic;ters shall be considawd a violation of the IS ctaver Use OrdimancetSM, ptarrl protection 42.22 V-Jfesbnort Uxi-1F Charlotte, NG 2U21 f Phone: 'r04i�336-440? 1�­U: Maer$-,�-3-5077 m.arl'otte-Niecklenhurg Utilities 0 CHARIA)TTEw (3) An initial testing of the treated groundwater it-utur boing discharged to the sanitary sewer for all parsmerers listed in tha NPDES permit Shall bp. performed vpilbin 30 days of startup and rammencument of Adischarge. The testing small be performer,) using approved :vaMmkrrzter methods tatrnd in 40 CFR 135 and submitted to Systern PTatectioa at the address I:sted belnw. 14) (Jpon subrnitwl of the t6sti;ng, irciude a statfament cartUyii'g that no ijn-treazO proundwater has been or o ill be discharged to the sankary seuver- This cartifiaatiio-'i sl'iall be sigre6 by an autharized reprusontative of Wachovia First Project. This cerdficatton of protrpr operation Bud maintenance shall he resubrttittcd annually as assurance that the t:oatr>>ari: system remains in service. (5)'Nachoy.ia's authariziud representatives shall assist CMU in the establishrnert of a billing account based on the appropriL"Ay type of VWrer meters. These motors %r.ill by usod to record the disrharga of tho treated q.rou ds,krater to the sanilary surfer for billing If you ;have pny questions or tweed further m-sistancre, please i A ratio at ;704}336-5042.- Thai%k you for year cooperation. Sin r Of iy. Tim Dcirons 1 nvironrnental Compliance Supc rvi:sor I nvirr)nm8J1 al Wir'iagelrent-Syste rn Protection Charlotte-Mecklenbura Dfilities cc: ne;gina Dobson C ousar, 1-ov iron mental Complianr:e Martager Svstam Pfflxect►err 4222 tiVesbnant Mive Cltartotte, NC 282-17 Phone: 704133E-4407 Fax 7 0411,36-5G7; Charlrrte-I'0ec lenburg Ut ides Kj7ECS CAROLINAS, LLP LLP Geotechnical • Construction Materials • Environmental November 9, 2009 Mr. Tom Belnick North Carolina Department of Environment and Natural Resources Division of Water Quality / NPDES Unit 1617 Mail Service Center Raleigh, North Carolina 27699-1617 Reference: Request for Permit Modification Wachovia Tryon Street BTS - NPDES Permit NCO088226 500 Block of South Tryon Street Charlotte, Mecklenburg County, North Carolina ECS Project 08-3515H Dear Mr. Belnick, ECS Carolinas, LLP, on behalf of Wachovia Bank, is requesting a modification to the existing National Pollutant Discharge Effluent System (NPDES) permit number NCO088226 issued to Wachovia Bank, N.A. Essentially, this modification is to incorporate the water presently being discharged from the catty -corner property located at The Green at Wachovia under NPDES permit number NCO086886 and incorporating a water treatment system designed by Aquapura, Inc. that utilizes the water for on -site needs such as in cooling towers thereby lowering the amount of municipal water required. When the site building is fully occupied and operational, the system is designed to use up to 100% of the treated groundwater captured from the both sites and little to no discharge to the outfall is expected. However, in the short term it is anticipated that there will be excess water which will require intermittent discharge of the outfall. Attached to this document is a completed NPDES Permit Application — Short Form C — GW for the revised permit and various supporting documents and figures. The following sections summarize the current site groundwater system (at Wachovia and The Green at Wachovia), the — existing NPDES permits, and the modified permit requested. Please note that the building is nearly completed and the startup of the new water system is essentially waiting on the approval of this permit modification. Therefore, representatives of Wachovia, ECS, NCDENR Division of Water Quality from the Mooresville Regional Office, and Mecklenburg County have conducted site meetings, discussions and site walk through visits in an attempt to expedite the approval of this modification. As such, the various representatives are available to meet with NCDENR Raleigh permitting personnel to further assist in expediting the permit approval. Please feel free to contact ECS to schedule a meeting at your earliest convenience to further expedite this process. - If you have any questions, comments or to schedule a meeting to discuss this permit modification request, please do not hesitate to contact us at (704) 525-5152. Sincerely, ECS CAROLINAS, LLP ltwI Travis L. O'Quinn Ro erA. Smith, P.G. Project Environmental Scientist Principal Geologist Attachment 8702 Red Oak Boulevard, Suite A, Charlotte, North Carolina 28217.704-525.5152 • Fax: 704-525-7178 • www.eeslimited.com '4 Request for Permit Modification Wachovia Tryon Street BTS • Charlotte, North Carolina ECS Project 08-3515H November 9, 2009 BACKGROUND INFORMATION The subject site is the Wachovia tower and subgrade parking deck at 550 South Tryon Street, also known as WCC or First Street Development (soon to be known as the Duke Energy Center, or DEC) currently undergoing construction located at the 500 block of South Tryon Street in Charlotte, Mecklenburg County, North Carolina. The Wachovia tower and parking deck site is bound by Church Street to the northwest, 1st Street to the northeast, Stonewall Street to the southwest and South Tyron Street. Currently, the site is operating under NPDES permit No. NCO088226 and discharging groundwater to a storm sewer located in South Tryon PW Street. The storm sewer ultimately discharges to Little Sugar Creek, a Class C surface water in the Catawba River Basin. Figures 1 and 2 indicate the location of this site and outfall location. A catty -corner property located at 401 South Tryon Street in Charlotte, Mecklenburg County, ma North Carolina (known as The Green at Wachovia) is occupied by an active subgrade parking deck, discharges treated groundwater to the storm sewer system under NPDES permit No. NC0086886. This permit authorizes the discharge of treated groundwater to the storm sewer em system which also ultimately discharges to Little Sugar Creek. Figures 1 and 2 indicate the location of this site. ® During design of the Wachovia tower it became apparent that when the building is fully operational, large volumes of water would be required for non -potable purposes. Therefore, in and effort to reduce the volume of municipal supplied water required to operate the tower, and in an environmentally sustainable response, Wachovia elected to capture and reuse water (groundwater from dewatering of the subgrade site structure and rainwater from Wachovia tower roof drains) from the site. Wachovia will treat the water and use it for the non -potable building needs. Depending upon the volume of water required for site use and the amount of site water captured, there may be intermittent discharge of the water to the storm sewer. Since the current NPDES site permit was designed and approved for the capture and discharge of the site water during construction and prior to building operation (i.e., without water capture and reuse), a modification to this permit is required for the future operation of the site system. Additionally, when the site building is fully operational, it is anticipated that additional water will _ Y be required to meet the non -potable demands. Therefore, as part of this permit modification request, Wachovia is also requesting to incorporate the water captured from the catty -corner subgrade parking from The Green at Wachovia. The following sections describe the current systems and the new system design to support the permit modification request in order to discharge treated water that can not be used onsite. Included in Appendix A of this document is a completed NPDES Permit Application — Short Form C — GW for the permit modification. Since the current design and building use expectations are to intermittently discharge excess treated water for the life of the building, it is expected that discharge to surface water will be conducted for an indefinite time period and therefore the modified NPDES permit will be required for an unknown time period. EXISTING SYSTEMS As previously stated, there are two existing groundwater discharge systems that are anticipated to be combined for this modified permit. The following generally describe these two existing systems. Im am '6 Request for Permit Modification Wachovia Tryon Street BTS Charlotte, North Carolina ECS Project 08-3515H November 9, 2009 o. Wachovia In order to prevent the flooding of groundwater into the subgrade parking levels beneath the Wachovia tower, dewatering takes place beneath the lowest levels of the subgrade parking. The system collects groundwater beneath the site via a subslab french drain systems located below the bottom level of the subgrade building parking level at an approximate depth of 80 to 100 feet below grade. The captured groundwater is piped to a holding tank where various floor drains from within the subgrade parking levels and various roof drains of the site building are also collected. When the level within the holding tank rises to a predetermined depth, a float switch triggers a pump within the tank to pump the water through piping within the subgrade parking deck and out to the storm sewer manhole located within South Tryon Street where it is discharged. FM In accordance with the current NPDES permit, the Wachovia system does not currently include treatment of the water prior to discharge. However, the permit does require that the discharge be monitored, sampled, and reported. Additionally, a monthly Direct Monitoring Report (DMR) ® is required to be submitted to the North Carolina Department of Environment and Natural Resources, Division of Water Quality (NCDENR, DWQ). The DMR requires the monthly monitoring, including the collection of grab effluent samples for laboratory analysis, and reporting of: ➢ Flow; ➢ Total Suspended Solids (TSS); ➢ Oil and Grease; ➢ Benzene, Toluene, Ethylbenzene, total Xylenes (BTEX); ➢ Methyl tert-butyl ether (MTBE); ® ➢ total Lead; ➢ 1,2-Dichloroethane (1,2-DCA); ➢ Naphthalene; and ➢ n-Butylbenzene. Once per quarter, additional grab samples of the effluent are required to be collected and submitted laboratory analysis for chronic toxicity with results submitted to the NCDENR. A copy ® of the current NPDES permit (NC0088226) is included in Appendix B and the most recent, DMR and AT-1 reports for the month of September 2009 are included in Appendix C. The Green at Wachovia In order to prevent the flooding of groundwater into the subgrade parking levels of the parking deck at The Green at Wachovia, dewatering takes place beneath the lowest levels of the subgrade parking. The system collects groundwater beneath the site via a subslab french drain systems located below the bottom level of the parking deck. The captured groundwater is piped to a holding tank located within an equipment storage room in the bottom parking level, where it is then pumped through a carbon filtration system prior to being discharged to the storm sewer. In accordance with the current NPDES permit, The Green at Wachovia system does include treatment of the water prior to discharge, via the carbon filtration system. The permit also 'a requires that the discharge be monitored, sampled, and reported. Additionally, a monthly DMR is required to be submitted to the NCDENR, DWQ. The DMR requires the monthly- monitoring, including the collection of grab effluent samples for laboratory analysis, and reporting of: o - Request for Permit Modification Wachovia Tryon Street BTS Charlotte, North Carolina ECS Project 08-3515H November 9, 2009 e.. ➢ Flow; ➢ TSS; .o ➢ Oil and Grease; ➢ Benzene; ➢ Chloroform; ➢ 1,2-DCA; ➢ MTBE; ➢ Tetrachloroethene (PCE); ➢ Trichloroethene (TCE); ➢ total Zinc; ➢ total Iron; and ➢ total Manganese. eft Once per quarter, additional grab samples of the effluent are required to be collected and submitted laboratory analysis for chronic toxicity with results submitted to the NCDENR. A copy an of the current. NPDES permit (NC0086886) is included in Appendix D and the most recent, DMR and AT-1 reports for the month of September 2009 are included in Appendix E. PROPOSED MODIFIED SYSTEM As previously stated, the proposed modified system incorporates the water currently being discharged from the Wachovia and The Green at Wachovia systems in order to supply the non - potable water demand for the site building, once it is in full operation. However, there will be times when there will be more water generated than will be required for use by the building. Therefore, this permit modification is requested to allow the intermittent discharge of the excess water from the modified system. The new system will generally consist of three collection sumps located below the bottom level of the Wachovia subgrade parking deck where the groundwater at the Wachovia and The Green at Wachovia will collect. Water within the sumps are then routed to a 2,500 gallon mixing tank of the Aquapura system, which begins the water treatment, prior to being pumped into one of several subgrade holding tanks, where the treated water will remain until needed as part of the non -potable use of the building. The non -potable water use consists of makeup water for the cooling towers located upon the top of the Wachovia building. Figure 3. is'a site plan showing the generalized modified system, including the current and potential future location of the flow meter, and the effluent sampling location. The Aquapura system is designed to handle 87,840 gallons per day (gpd) of groundwater, but it is only estimated to collect and treat approximately 69,840 gpd. Of this treated amount, 9 °o ? an (approximately 66,348 gpd) will be used in the cooling towers, with the remaining 5% ,492 gpd) potentially being discharged to the storm sewer via the NPDES permit. ® Aquapura System The Aquapua treatment system is situated within a separate room within the base level of the subgrade parking deck of the Wachovia tower. The major components of the system generally consist of the following: ➢ Chlorine dosing tank (to limit bacterial growth); ➢ Air stripper (to remove volatile organics); me i c Request for Permit Modification Wachovia Tryon Street BTS a' Charlotte, North Carolina ECS Project 08-3515H November 9, 2009 .. ➢ Zeolite media filter; ➢ Anti -scaling dosing system; ➢ Sodium Metabisulfate dosing system; ➢ Ultra -filtration system; ➢ Reverse osmosis (RO) systems; and ➢ Permeate storage tanks. The chemicals introduced within the system include liquid dechlorination agent (liquid sodium hypochlorite 12%); antiscalant/antifoulant; and liquid sodium bisulfate. Although these chemicals are being added at various locations within the treatment system, they will be removed prior to exiting the system and/or will not be included in the effluent discharged to the storm sewer. Appendix F includes copies of the MSDSs for chemical additives to be used in the Aquapura treatment system. According to calculations conducted by Tempest Environmental Systems, Inc., designer of the Aquapura treatment system, the system is designed to treat and pump up to 61 gallons per minute of water with removal rates of up to 99.9% of the volatile organic compounds (VOCs). Figure 4 is a generalized diagram of the Aquapura treatment system. SUMMARY AND CLOSING Wachovia is requesting a permit modification to existing permit number NC0088226 to incorporate not only the existing water from the Wachovia tower site located at the 500 Block of South Tryon Street, but to also accept the groundwater currently being discharged from the catty -corner property known as The Green at Wachovia, under existing permit number NC0086886. Additionally, the permit modification is requested in order to accept excess water after treatment via a new water treatment system being installed at the site that will allow the reuse of up to 95% of the water generated from the two sites. The information and figures within this document are generalized in order to simplify the 4M understanding of the permit modification request. However, should more detailed figures and information be required, they can be provided to the NCDENR, upon request. Additionally, as stated in the opening cover letter, the various representatives of Wachovia, ECS, and Tempest FMO Environmental, Inc. are available to meet with NCDENR Raleigh personnel to further assist in review of the modification request information and to expedite the permit approval process. am MW me '� 4