VPDES PERMIT FACT SHEET This document gives pertinent information concerning the reissuance of the VPDES permit listed below. This permit is being processed as a minor municipal permit. The effluent limitations contained in this permit will maintain the Water Quality Standards of 9 VAC 25-260-00 et seq. The discharge results from the operation of an extended aeration activated sludge package treatment plant with metals treatment, tablet chlorination and tablet dechlorination of effluent prior to discharge. This permit action consists of reissuance of the permit for a term of five years with limitations for pH, biochemical oxygen demand (BOD5), total suspended solids (TSS), dissolved oxygen, ammonia as nitrogen, total residual chlorine (TRC), total recoverable copper and total recoverable zinc. (SIC Code: 4952 - sewage treatment) 1. Facility Name and Address: Groundhog Mountain Resort (Buck Hollar) STP Groundhog Mountain Water & Sewer Co., Inc., 2812 Brennen Lane, High Point, NC 27262 Location: 27 Buck Hollar Road, Groundhog Mountain Resort, Milepost 189, Patrick County, Virginia 2. Permit No. VA0066575 Expiration Date: September 1, 2011 3. Owner Contact: Mrs. Janet Clodfelter Telephone No.: (336)869-4032 Executive Secretary, Groundhog Mountain Water & Sewer Co., Inc. 2812 Brennen Lane., High Point, NC 27262 Mr. Robert Reed, Operator, Groundhog Mountain Water & Sewer Co., Inc 2014 Willis Gap Mountain Road, Fancy Gap, VA 24328 Local telephone: (276)398-3957 Winston-Salem: (336)788-1609 Mr. Ron Hyatt Telephone No.: (704)568-4929 President, Groundhog Mountain Water & Sewer Co., Inc. 6819 Rambling Rose Drive, Charlotte NC 28212 4. Application Complete Date: February 17, 2011 Permit Drafted By: Susan K. Edwards Date: July 15, 2011 DEQ Regional Office: Blue Ridge Regional Office Reviewed By: Bob Tate Date: August 25, 2011 Public Comment Period Dates: July20, 2011 through August 20, 2011 5. Receiving Stream Name: Unnamed tributary to Birds Branch (River mile: 3.24) Basin: Yadkin River Sub-basin: N/A Section: 1 Class: IV, Mountainous Zones Waters Special Standards: PWS 7-Day, 10-Year Low Flow (7Q10): 0.017 MGD 7Q10 High Flow months: Jan. - June 1-Day, 10-Year Low Flow (1Q10): 0.016 MGD 1Q10 High Flow months: Jan. - June 30-Day, 5-Year Low Flow (30Q5): 0.024 MGD Harmonic Mean Flow: 0.043 MGD 30-Day, 10-Year Low Flow (30Q10): 0.021 MGD Tidal: No 303(d) Listed? No (see section 13 for more information) Attachment A contains a copy of the flow frequency determination memorandum from the 2007 reissuance. It is believed the 2007 critical flows were low due to the influence of recent draught years preceding those critical flow calculations. There have not been updated gauge statistics available to statistically base an adjustment in critical flow values. 6. Operator License Requirements: III 7. Reliability Class: III 8. Permit Characterization: (X) Private ( ) Federal ( ) State ( ) POTW (X) PVOTW (X) Possible Interstate Effect ( ) Interim Limits in Other Document VPDES Permit No. VA0066575 Page 2 of 9 9. Wastewater Treatment System: See Attachment A for a treatment plant schematic and a copy of the site visit report. Discharge Description Outfall Discharge Source Treatment Design Flow 001 63 seasonal residences of Aer-O-Flo extended aeration package 26,000 gallons Groundhog Mountain Estates wastewater treatment plant consisting of per day & the seasonally operated comminutor, aeration tank, clarifier, sludge Doe Run Lodge (at reissuance return, sludge holding tank, chlorination, Lodge is not operating) dechlorination, metals removal system & cascade aeration 10. Sewage Sludge Use or Disposal: A VPDES Sewage Sludge Application Form was submitted in the application for reissuance package for the VPDES permit. Sludge is held in the aerobic sludge digester tank. The permittee contracts a local septic waste transporter for disposal of sewage sludge from the wastewater treatment facility to the Martinsville City Sewage Treatment Plant, VA0025305. 11. Discharge Location Description: The resort is on the south side of the Blue Ridge Parkway, milepost 189, Groundhog Mountain, Patrick County, Virginia. The treatment plant is located in a hollow, between two ridges on the western side of the Groundhog Mountain Estates area of the resort. A copy of a portion of the USGS topographic map indicating the discharge location is included in Attachment A. There are no significant (large) dischargers to the receiving stream or water intakes within the immediate area. Name of Topo: Laurel Fork (020A) Discharge: N 36°38’24”, E 80°32’29” 12. Material Storage: Tablets used for chlorination and dechlorination are stored within a storage building within the fenced and locked plant yard. No materials are stored in a location that exposes them to rainfall where they might present a risk of reaching State waters. 13. Ambient Water Quality Information The receiving water body is an unnamed tributary to Birds Branch. The receiving water body is within Section 1 of the Yadkin River basin and no designated sub-basin of the State Water Control Board’s Water Quality Standards, River Basin Section Tables (9 VAC 25-260-460). The receiving stream is Class IV - Mountainous Zones Water with the special standards of Public Water Supply (PWS) applicable due to the proximity to the VA-NC state line. The outfall is at river mile 3.24. Groundhog Mountain Resort STP falls into the Yadkin River/Upper Ararat River watershed (VAW-M03R). The VAW-M03R watershed segment begins at the headwaters of the Ararat River and ends downstream at the Virginia/North Carolina state line. The segment includes the tributaries Johnson, Doe Run and Clarks Creek. The receiving stream drains to the Ararat River in a segment denoted as a Class IV water. The discharge is not within the segment where Natural Trout Waters or where Stockable Trout Waters are designated, in the Standards. Attachment A contains data from STORET Station 4BARA035.13 used to calculate the receiving stream values for pH, temperature and hardness. 303(d) Listed Segments (TMDL): This facility discharges to an unnamed tributary to Birds Branch. In the 2010 305(b) Water Quality Assessment Report prepared by DEQ, the Groundhog Mountain Resort STP falls into the Yadkin River/Upper Ararat River watershed (VAW-M03R). The 2010 305(b)/303(d) Integrated Report on Assessment the tributary sections of the watershed have not had their water Uses assessed. An excerpt from the web-based VEGIS mapping of the 2010 305(b)/303(d) Water Quality Assessment Report is provided in Attachment A. However, the Ararat River downstream of the discharge is 303(d) Listed for bacteria and mercury in fish tissues (see Attachment A). The TMDL has not been developed for either impairment. As an existing discharge within the watershed the facility should be included as appropriate in the TMDL when written. There is no approved TMDL for either the downstream bacteria or mercury impairment so no monitoring is included in this reissuance. After TMDL adoption it is VPDES Permit No. VA0066575 Page 3 of 9 expected that E. coli monitoring for an allocation will be part of the permit. The TMDL reopener special condition is included. 14. Antidegradation Review and Comments: Tier1 Tier2 X Tier3 The State Water Control Board's Water Quality Standards includes an antidegradation policy (9 VAC 25-260- 30). All state surface waters are provided one of three levels of antidegradation protection. For Tier 1 or existing use protection, existing uses of the water body and the water quality to protect these uses must be maintained. Tier 2 water bodies have water quality that is better than the water quality standards. Significant lowering of the water quality of Tier 2 waters is not allowed without an evaluation of the economic and social impacts. Tier 3 water bodies are exceptional waters and are so designated by regulatory amendment. The antidegradation policy prohibits new or expanded discharges into exceptional waters. The antidegradation review begins with a Tier determination. The unnamed tributary to Birds Branch is determined to be a Tier 2 waterbody. This determination is based on the waterbody segment (VAW-M03R) is not listed on Part I of the 303(d) list for exceedance of water quality criteria. As the headwaters of a mountainous stream, there is no data to indicate that this water is not better than the standards for all parameters that the Board has adopted criteria. As a Public Water Supply, in accordance with Guidance Memorandum 00-2011, the waterbody would be designated to be Tier 2 waters, and no significant degradation of existing quality would be allowed. For purposes of aquatic life protection in Tier 2 waters, “significant degradation” means that no more than 25 percent of the difference between the acute and chronic aquatic criteria values and the existing quality (unused assimilative capacity) may be allocated. For purposes of human health protection, “significant degradation” means that no more than 10 percent of the difference between the human health criteria and the existing quality (unused assimilative capacity) may be allocated. The antidegradation baseline for aquatic life and human health are calculated for each pollutant as follows: Antidegradation baseline (aquatic life) = 0.25 (WQS – existing quality) + existing quality Antidegradation baseline (human health) = 0.10 (WQS – existing quality) + existing quality Where: “WQS” = Numeric criterion listed in 9 VAC 25-260-5 et seq. for the parameter analyzed “Existing quality” = Concentration of the parameter being analyzed in the receiving stream These “antidegradation baselines” become the new water quality criteria in Tier 2 waters and effluent limits for future expansions must be written to maintain the antidegradation baselines for each pollutant. Antidegradation baselines were calculated at the last reissuance as described above. However, the discharge was listed as a domestic waste discharger in the 1975 Water Quality Management Plan for the Roanoke River Basin which is before the State Water Control Board’s adoption of an anti- degradation policy on November 28, 1975. As a discharge pre-dating anti-degradation the policy does not apply to this discharge. The flow of the receiving stream at critical flow conditions has not change with this reissuance. Although, the receiving stream flows have not changed all water quality based effluent limitation development have been updated as discussed below.
15. Site Visit: Date: June 14, 2011 (copy of memo in Attachment A) Performed by: Susan K. Edwards_
16. Effluent Screening & Limitation Development: In accordance with the current VPDES permit, effluent has been monitored for flow as well as compliance with pH, BOD5, TSS, DO, ammonia, chlorine, total copper and total zinc limitations. As noted above, because the discharge began prior to Nov. 28, 1975 antidegradation does not apply. Effluent limitations and monitoring requirements are based on Federal Effluent Guidelines 40 CFR 133, Virginia’s water quality standards (9 VAC 25-260-5 et seq.) (specifically DEQ Guidance Memorandum 00-2011), the previous permit, the VPDES Permit Manual and best engineering judgment. See Attachment B for supporting documents discussed in this section. See Table II at the end of this Fact Sheet for a summary of limits and monitoring requirements. VPDES Permit No. VA0066575 Page 4 of 9 A review of effluent data from the last three-year period as submitted on Discharge Monitoring Reports indicate that the discharge is well below the design/permitted flow for the plant of 0.026 MGD. Effluent quality has remained well within compliance limits for all parameters monitored. The limitations for copper & zinc indicate that the metals removal system is performing well for the plant. Effluent testing data submitted as part of the application was reviewed to determine if there is “suitable data” for analysis. Suitable data is that which is quantifiable and for which there are water quality standards in the state. The evaluation is of parameters that are not currently limited in this permit to assess the need to include limit as part of this reissuance. Application Data - All application data submitted except for temperature are limited in the permit and will continue with this reissuance. A. Mixing Zone - The receiving water body is an unnamed tributary to Bird Branch. Mixing zones are allowed in perennial waters, provided the antidegradation requirements for the waters are met. The agency Mixing Zone program, MIXER version 2.1, calculates how much of each critical flow the discharge is mixed with at the 7Q10, 30Q10, 1Q10, 30Q5, and the wet season/high flow 30Q10 and 1Q10. The analysis indicates that a complete mixed assumption is appropriate for each flow level. These results are needed as inputs on the wasteload allocation spreadsheet as discussed below in part C of this section. B. Effluent Limitations for Conventional Pollutants Flow - The treatment plant has a design capacity 0.026 MGD. The flow from the treatment plant is not limited but is estimated daily and reported monthly. Flow is estimated based on the nearest ¼-inch measure of a weir at the treatment plant. The measurement is not very accurate but is adequate for flows so far below plant design rating. A review of the last 3-year period of DMR data found monthly average flows consistently below 1,000 gallon-per-day (but variable due to the seasonal occupancy of the service area) and a monthly maximum during the 3 years of 6,000 gallons-per-day. pH - Limitations for pH are 6.0 S.U. minimum and 9.0 S.U. maximum according to the WQS 9 VAC 25-260-50 as a Class IV Mountainous Zone Waters and Federal Effluent Guidelines’ secondary treatment requirements (40 CFR 133). Monitoring is once per day by grab sample.
Biological Oxygen Demand (BOD5), Total Kjeldahl Nitrogen (TKN) and Dissolved Oxygen (DO) - The Regional Water Quality Model for Free Flowing Streams, Version 4.11, was used to evaluate the effects of the discharge on the dissolved oxygen levels in the receiving stream. Three stream segments following the discharge were modeled to determine the combination of BOD5, TKN, and DO effluent limits needed to maintain the water quality minimum DO standard for a Class IV water of 5.0 mg/l. The treatment plant design flow of 26,000 gpd was input together with an effluent temperature of 20 ºC, a segment length of 0.2 mile and an effluent DO of 6.0 mg/l. The Federal Effluent Guidelines’ secondary treatment standards (40 CR Part 133.102) of 30 mg/l BOD5 was modeled with the existing DO limit of 6.0 mg/l minimum. A TKN value of 8.0 mg/l provides an acceptable model DO outcome in that the DO in all 3 segments never drops below 5.0 mg/l which is the water quality standard to be maintained in the segment (6.0 was the modeled minimum). The additional DO modeling criteria, confirming that DO sag has been captured by the modeled segments, is met at the end of each segment when the DO value in the model jumps with the next segment. The need for a TKN limit is based the relationship of toxicity- based ammonia limit and the TKN limit needed to protect the stream DO as modeled. The narrative on TKN limit evaluation is at the end of the ammonia limitation development below. The DO minimum of 6.0 mg/l is sampled taken by a daily grab sample at the point of discharge. Effluent limits of 30 mg/l as a maximum weekly average and 45 mg/l as a monthly average have been required for BOD5. BOD5 monitoring is at once per month by grab sample. In addition, the facility is to meet a minimum technology based requirement for 85% removal efficiency for BOD5. See Attachment B for the water quality model inputs and outputs. Total Suspended Solid (TSS) - Secondary treatment standards as mandated by the federal technology- based guidelines (40 CR Part 133.102) are applicable to the TSS limit. Effluent limits of 30 mg/l as a VPDES Permit No. VA0066575 Page 5 of 9 monthly average and 45 mg/l as a weekly average have been required for TSS. TSS monitoring is once per month by a grab sample. In addition, the facility is to meet a minimum technology based requirement for 85% removal efficiency for TSS. E. coli – The Water Quality Standards (WQS) which became effective on January 15, 2003, included a change of bacteria standards in 9 VAC 25-260-170.A, as well as the revised disinfection policy of 9 VAC 25-260-170.B. These standards replaced the fecal coliform standard and disinfection policy of 9 VAC 25-160-170. In accordance with agency guidance, the new bacteria standard is included in all existing VPDES permits upon reissuance referencing E. coli as the indicator species rather than fecal coliform. The same procedures and protocols used for bacterial standards in earlier guidance, substituting the applicable new bacteria criterion of E. coli for fecal coliform, except that where chlorine was previously used as a surrogate for fecal coliform limitations. Based on the minutes of the Water Permit Manager’s conference call on February 4, 2004, 23 study results (all passing) indicated that chlorine appeared to be an appropriate surrogate for E. coli testing. The practice of using chlorine monitoring as a surrogate for adequate disinfection is continued in Permits for municipal discharges that are not to bacterial impaired waters or that do not have an approved TMDL as is the case for Groundhog Mountain STP. Disinfection requirements (residual chlorine monitoring) are included and reported on the Discharge Monitoring Report. Final effluent TRC is discussed under the Toxics heading below. C. Effluent Limitations for Toxic Pollutants - As noted above, because the discharge began prior to Nov. 28, 1975 anti-degradation does not apply. A Water Quality Wasteload Allocation (WLA) spreadsheet (MSTRANTI version 2a) has been prepared with receiving stream critical flows. The effluent maximum 90% and 10% pH are taken from DMR reported pH values from the preceding 3 years, at 7.6 and 6.7 respectively. The effluent hardness used in calculations was taken from the single reading provided with the metals sampling and analysis in the 1997 reissuance, at 34.0 mg/l CaCO3. Receiving stream hardness is the mean of the STORET station 4BARA035.13 data, at 16.74 mg/l CaCo3. The stream and effluent temperature were assumed as that of the STORET station at 22.7˚C for the 90% annual and 13.7 for the 90% during the wet season, January through June. No representative temperature data is available for the receiving stream or the discharge. Refer to Attachment B for the WLA spreadsheet (MSTRANTI) and effluent limit statistical evaluation program output files. The Tier 1 WLAs from the spreadsheet were used in limit determination because the discharge pre-dates the effective date of anti-degradation policy. Ammonia as Nitrogen - The need for an ammonia limit has been evaluated in accordance with Guidance Memorandum 00-2011 using the MSTRANTI WLAs. A default effluent data point of 9 mg/l was entered into the STATS.exe 2.0.4 program to establish a limit, which will protect the receiving water body from the reasonable potential to exceed the water quality standards. The STATS program determined that a chronic-based limit of 7.14 mg/l is needed for ammonia as nitrogen. This less stringent effluent limit is actually the result in a change in the averaging period for ammonia in the Water Quality Standards. Relaxing of the limit is not allowed in this situation under the anti-backsliding provisions of 9 VAC 25-31-220.L.2.b.(1) of the VPDES Permit Regulations. The 2002 permit included an effluent limit of 4.37 mg/l for ammonia as an average weekly maximum and monthly average. These will be retained but truncated to 2 significant digits to 4.3 mg/l in this reissuance. Monitoring of ammonia is at once per month by grab sample. In accordance with Guidance Memo 00-2011, the relation between ammonia as nitrogen and TKN is 3 mg/l refractory nitrogen. Here the relationship is 4.3 mg/l ammonia + 3 mg/l refractory nitrogen is equivalent to 7.3 mg/l TKN. The desktop DO model as discussed above at a BOD5 limit of 30 mg/l, a DO limit of 6.0 and a TKN of 8 mg/l maintains water quality. Therefore, the TKN limitation is not needed, as the ammonia limit will in essence limit the TKN to less than 7.3 mg/l which is less than the 8.0 mg/l used in the acceptable DO model. Total Residual Chlorine (TRC) - The treatment plant uses chlorination as the disinfection method. The water quality based TRC limits were reevaluated, in accordance with the current VPDES Permit VPDES Permit No. VA0066575 Page 6 of 9 Manual and Guidance Memo 00-2011 procedures, using the revised WLA spreadsheet and agency STATS.exe statistical software package together with one datum value of 20 mg/l to force the program to calculate the permit limits for TRC. The revised TRC toxic limits for the effluent are a maximum weekly average of 15 μg/l and monthly average of 13 μg/l. The values are truncated to 2 significant figures. Monitoring is once per day by grab sample at the effluent. The Special Condition for internal monitoring for disinfection is included in Part I of the permit. The allowed number of excursions allowed within Part I.B.1.b. of the permit is based on the facility discharging 30 days per month. Copper and Zinc - The 1997 VPDES permit included a special condition to obtain a single screening data value for several metals together with a hardness value. The data results were dissolved copper of 20 μg/l and dissolved zinc of 40 μg/l. This limited copper and zinc data was used in a reasonable potential to exceed the water quality standards evaluation in accordance with Guidance Memorandum 00-2011. The copper and zinc acute and chronic WLAs were input into the STATS.exe statistical software package together with the one data value for each. A metals removal treatment system is installed. The effluent limits from the 2002 permit, of 8.65 μg/l copper and 65 μg/l zinc as both maximum weekly average and monthly average were reevaluated with the 2007 revised receiving stream flows and related WLAs from the MSTRANTI spreadsheet. The metals data collected during the term are reported to have been collected using “clean” techniques, however the samples may have been analyzed as total copper and zinc rather than dissolved metals. The STATS.exe runs were performed twice for each metal, using just the single data point collected during the 1997 permit term and then with the data set collected during the 2002-2007 permit term. The outcome was the same with both limits dropping slightly at the 2007 reissuance to 6.4 μg/l copper and 63 μg/l zinc. The VPDES Permit Regulations (9 VAC 25-31-10 et seq.) requires metals limits be in terms of total recoverable metals rather than dissolved in which the Water Quality Standards are written. Monitoring is at once/quarter by grab sample. This is a variance from the recommended monitoring frequency of the VPDES Permit Manual for a discharge of this size at once per month. This frequency has been specified because the flows are so far below the design capacity of the treatment plant (less than 1000 gallons-per-day) and all effluent passes through the metals removal system prior to discharge. This is the same frequency as required at the last reissuance. Other Toxics - No other suitable toxics data is available. In accordance with Agency guidance as a discharge with a design capacity less than 40,000 gallons-per-day, no additional water quality standards monitoring will be required. Review of Reduced Monitoring Frequency - Guidance Memos 00-2011 and 98-2005 allow for reduced monitoring at facilities with excellent compliance histories. To qualify for consideration of reduced monitoring requirements, the facility should not have been issued any Warning Letters, NOVs, or NULEs, or be under any Consent Orders, Consent Decrees, Executive Compliance Agreements, or related enforcement documents during the past three years. The facility received a Warning Letter in November 2010 for a chlorine violation and late DMR September 2010. In addition there were a couple Warning Letters in 2008. As such the permitted facility is not eligible for reduction of the frequency of effluent monitoring at this reissuance but this determination is considered at each reissuance. 17. Basis for Sludge Use and Disposal Requirements: A VPDES Sewage Sludge Application Form was submitted in the application package related to handling of sludge from the sludge holding tanks. The Groundhog Mountain Resort STP contracts the transport of the sludge on an as-needed basis to the Martinsville STP, VA0025305. A Sludge Reopener special condition is included in the event regulations regarding sludge change to affect this type of operation. 18. Antibacksliding Statement: The anti-backsliding requirements set forth in 9 VAC 25-31-220.L.2.b.(1) of the VPDES permit regulations address acceptable circumstances when water quality based effluent limitations may be made less stringent when a VPDES permit is reissued. All limitations are as stringent as the previous permit. Accordingly the anti-backsliding provisions are satisfied. VPDES Permit No. VA0066575 Page 7 of 9 19. Compliance Schedule: There are no new limits in the permit requiring a schedule to achieve compliance. 20. Special Conditions: A brief rationale for each special condition contained in the permit is given below. a. Additional Chlorine Limitations and Monitoring Requirements (Part I.B.1) - Required by Sewage Collection and Treatment Regulations, 9 VAC 25-790, bacteria standards; other waters. Also, 40 CFR 122.41(e) requires the permittee, at all times, to properly operate and maintain all facilities and systems of treatment in order to comply with the permit. This ensures proper operation of chlorination equipment to maintain adequate disinfection. b. 95% Capacity Reopener (Part I.B.2) - Required by VPDES Permit Regulation, 9 VAC 25-31-200 B 4 for all POTW and PVOTW permits c. Indirect Dischargers (Part I.B.3) - Required by VPDES Permit Regulation, 9 VAC 25-31-200 B 1 and B 2 for POTWs and PVOTWs that receive waste from someone other than the owner of the treatment works. d. CTC, CTO Requirement (Part I.B.4) - Required by Code of Virginia § 62.1-44.19; Sewage Collection and Treatment Regulations, 9 VAC 25-790. e. O&M Manual Requirement (Part I.B.5) - Required by Code of Virginia § 62.1-44.19; Sewage Collection and Treatment Regulations, 9 VAC 25-790; VPDES Permit Regulation, 9 VAC 25-31-190 E. f. Licensed Operator Requirement (Part I.B.6) - The VPDES Permit Regulation, 9 VAC 25-31-200 C and the Code of Virginia § 54.1-2300 et seq, Rules and Regulations for Waterworks and Wastewater Works Operators (18 VAC 160-20-10 et seq.), require licensure of operators. In accordance with the Office of Wastewater Engineering (OWE) recommendation, a Class III licensed operator is required for this facility because of addition of the metals removal system. g. Reliability Class (Part I.B.7) - Required by Sewage Collection and Treatment Regulations, 9 VAC 25-790 for all municipal facilities. The Reliability Class has been changed from a Class I to Class III in agreement with the OWE recommendation for the facility. Although the Water Quality Standards designate the receiving stream segment as a Public Water Supply, the intake is estimated to be greater than 10 miles downstream. Based on the capacity of the plant and its distance from the water intake, it is believed that Class III reliability will adequately protect the water supply. h. Sludge Reopener (Part I.B.8) - Required by VPDES Permit Regulation, 9 VAC 25-31-220 C for all permits issued to treatment works treating domestic sewage. i. Section 303(d) List (TMDL) Reopener (Part I.B.9) - Section 303(d) of the Clean Water Act requires that total maximum daily loads (TMDLs) be developed for streams listed as impaired. This special condition is to allow the permit to be reopened if necessary to bring it into compliance with any applicable TMDL approved for the receiving stream. The re-opener recognizes that, according to section 402(o)(1) of the Clean Water Act, limits and/or conditions may be either more or less stringent than those contained in this permit. Specifically, they can be relaxed if they are the result of a TMDL, basin plan, or other wasteload allocation prepared under section 303 of the Act. j. Compliance Reporting (Part I.B.10) - Authorized by VPDES Permit Regulation, 9 VAC 25-31-190 J 4 and 220 I. This condition is necessary when pollutants are monitored by the permittee and a maximum level of quantification and/or a specific analytical method is required in order to assess compliance with a permit limit or to compare effluent quality with a numeric criterion. The condition also establishes protocols for calculation of reported values. k. Sludge Use and Disposal (Part I.B.11) - VPDES Permit Regulation, 9 VAC 25-31-100 P; 220 B 2; and 420 through 720, and 40 CFR Part 503 require all treatment works treating domestic sewage to submit information on sludge use and disposal practices and to meet specified standards for sludge use and disposal. l. Treatment Works Closure Plan - (Part I.B.12) - State Water Control Law § 62.1-44.19. This condition is used to notify the owner of the need for a closure plan if a treatment works is replaced or closed. VPDES Permit No. VA0066575 Page 8 of 9 m. Conditions Applicable to All Permits (Part II) - VPDES Permit Regulation, 9 VAC 25-31-190 requires all VPDES permits to contain or specifically cite the conditions listed. 21. Changes to Permit: There have been no changes to the effluent limits or monitoring frequencies since the 2007 reissuance of this permit. A TMDL Special Conditions has been added but no other new conditions or deletions from the 2007 permit. The order and wording of Special Conditions have been updated to reflect the latest edition of the DEQ VPDES Permit Manual. The quantification level of the metals limits have been lowered in Condition I.B.10. The effluent limitations for Ammonia and the weekly average limit for Total Residual Chlorine have been truncated to 2 significant digits in accordance with Guidance Memo 06-2016. During the Public Notice period – Some changes were identified and corrected during the notice period, but no copies had been distributed to the public & changes didn’t change the content of the published Notice. 22. Variances/Alternate Limits or Conditions: The permittee requested a waiver from application testing requirements prior to submitting the application for reissuance of this permit. The request was for waiving effluent temperature values and fecal coliform analysis required by EPA Form 2A, item A.12. Limitation development uses receiving stream temperatures as representative of effluent temperature and is considered adequately representative. The freshwater bacterial standard has changed in Virginia to E. coli and the fecal coliform analysis is not used in permit development. Therefore a waiver of these application items was granted. The frequency of metals monitoring for copper and zinc is at once/quarter rather than once/month as recommended in the VPDES Permit Manual. This frequency is used because the flow at the plant is so far below design capacity with averages below 1000 gallons/day and because the metals removal system in passive. The frequency is continued from the previous reissuance. The permit expiration date has been moved forward to coincide with the end of August so that the next permit term will start with September 1 and there will not be an overlap of monthly monitoring submittal between the 2 permit terms. No other variances or alternatives to required permit conditions/limitations are within the permit. No variances from technology guidelines or water quality standards or from VPDES permit manual guidance are known to be used in the development of this permit. 23. Regulation of Users: (9 VAC 25-31-280 B 9) There are no industrial contributors to the treatment works. 24. Public Notice Information required by 9 VAC 25-31-280 B: All pertinent information is on file and may be inspected, and copied by contacting Susan Edwards at: Virginia DEQ, Blue Ridge Regional Office - Roanoke, 3019 Peters Creek Road, Roanoke, VA 24019 Telephone no. (540)562-6764 or [email protected]. Persons may comment in writing or by email to the DEQ on the proposed permit action, and may request a public hearing, during the comment period. Comments shall include the name, address, and telephone number of the writer and of all persons represented by the commenter/requester, and shall contain a complete, concise statement of the factual basis for comments. Only those comments received within this period will be considered. The DEQ may decide to hold a public hearing, including another comment period, if public response is significant and there are substantial, disputed issues relevant to the permit. Requests for public hearings shall state 1) the reason why a hearing is requested; 2) a brief, informal statement regarding the nature and extent of the interest of the requester or of those represented by the requester, including how and to what extent such interest would be directly and adversely affected by the permit; and 3) specific references, where possible, to terms and conditions of the permit with suggested revisions. Following the comment period, the Board will make a determination regarding the proposed permit action. This determination will become effective, unless the DEQ grants a public hearing. Due notice of any public hearing will be given. The public VPDES Permit No. VA0066575 Page 9 of 9 may review the draft permit and application at the DEQ Blue Ridge Regional Office – Roanoke by appointment.
25. Additional Comments: Previous Board Action: none. Staff Comments: The discharge is not controversial. The BRRO-R Water Permit Support Group notes that the discharge is in conformance with the existing planning document for the area. Public Comments: No comments were received during the public notice period. Other Agency Comments: The VDH Abingdon Office of Drinking Water replied to the review of application package by memorandum dated Feb. 23, 2011. Their memo commented: ‘There are no public water supply intakes located within 15 miles downstream of the discharge. We recommend a minimum Reliability Class III for this facility. We have no comments on the discharge.
26. 303(d) Listed Segments (TMDL): this portion of Fact Sheet discussion has moved to part 13 of the Fact Sheet to better reflect the logical flow of Permit development discussion. TABLE II Basis for Effluent Limitations ( ) Interim Limitations Design Flow: 0.026 MGD Effective Dates - From: date of reissuance* (x) Final Limitations To: expiration MONITORING DISCHARGE LIMITS REQUIREMENTS PARAMETER BASIS FOR LIMITS Monthly Weekly Sample Minimum Maximum Frequency Average Average Type Flow (MGD) NA - monitoring only NL NA NA NL 1/day estimate 1 - 40 CFR 133 pH (std units) NA NA 6.0 9.0 1/day grab 2 1 - 40 CFR Part 133.102 30 mg/l 45 mg/l BOD NA NA 1/month grab 5 2 - DO model analysis 3.0 kg/day 4.4 kg/day Total Suspended 30 mg/l 45 mg/l 1 - 40 CFR Part 133.102 NA NA 1/month grab Solids 3.0 kg/day 4.4 kg/day
Dissolved Oxygen 2 - DO model analysis NA NA 6.0 mg/l NA 1/day grab
Ammonia as Nitrogen 2 - WQS toxic evaluation 4.3 mg/l 4.3 mg/l NA NA 1/month grab Total Residual 2 - WQS toxic evaluation 13 μg/l 15 μg/l NA NA 1/day grab Chlorine Copper, Total 2 - WQS toxic evaluation 6.4 μg/l 6.4 μg/l NA NA 1/quarter grab Recoverable* Zinc, Total 2 - WQS toxic evaluation 63 μg/l 63 μg/l NA NA 1/quarter grab Recoverable*
NA= Not Applicable NL = No Limitation 1/day = once per day 1/month = once per month 1/quarter = once per quarter
The basis for limitation codes are: 1. Federal Effluent Guidelines 2. Water Quality-based limits 3. Best Professional Judgment
VPDES Permit VA0066575 Groundhog Mountain Resort STP Reissuance September 2011
ATTACHMENT A
1. Flow Frequency Memo of April 17, 2007
2. Schematic of treatment plant from Operations & Maintenance Manual.
3. Portion of Laurel Fork USGS quadrangle with approximate location of discharge indicated
4. Site visit report of July 12, 2011 (June 13, 2011 visit)
5. Excerpt of website-based VEGIS map & associated text from 2010 305(b)/303(d) Water Quality Assessment of Use Support for VAW-M03R watershed with discharge location identified.
6. Ararat River 2010 Impaired Waters listing for bacteria & mercury in fish tissue (M03R-01). Note that the impairment is downstream of discharge: from near the VA/NC line up to the Route 823 crossing and does not include the tributaries to the River at this time.
7. STORET data summary Station 4BARA035.13, Route 739 Bridge near Virginia/North Carolina line, on Ararat River, Patrick County, Virginia
MEMORANDUM DEPARTMENT OF ENVIRONMENTAL QUALITY Water Permitting, West Central Regional Office 3019 Peters Creek Road, Roanoke, VA 24019-2738 ______
SUBJECT: Flow Frequency Determination Groundhog Mountain Resort STP - VA#0066575 TO: Permit reissuance file FROM: Susan Edwards, WCRO DATE: April 17, 2007
This memo supersedes the February 20, 2002, memo from Paul Herman, DEQ Office of Water Quality Assessment and Planning concerning the subject VPDES permit. The Groundhog Mountain Resort STP discharges to an unnamed tributary of Birds Branch near Ararat, VA. Stream flow frequencies are required at this site for use in developing effluent limitations for the VPDES permit. The VDEQ conducted several flow measurements on the unnamed tributary of Birds Branch (Trib #2) from 1995 to 2000. The measurements were made just upstream of the Groundhog Mountain Resort STP, near Ararat, VA. The measurements were correlated with the same day daily mean values from the continuous record gage on the South Mayo River near Nettleridge, VA #02069700. The measurements and daily mean values were plotted on a logarithmic graph and a best fit line was drawn through the data points. The required flow frequencies from the reference gage were plugged into the equation for the regression line and the associated flow frequencies at the measurement site were calculated. Critical flow values have all been reduced both at the gage station and at the discharge. This is believed to all be related to the most recent reduction in rainfall in the region that has resulted in reductions in statistical critical flow values at most gage stations. The data for the reference gage and the measurement site/discharge point are presented below: South Mayo River near Nettleridge, VA (#02069700): Drainage Area = 84.6 mi2 1Q30 = 15 cfs 30Q10 = 31 cfs 1Q10 = 22 cfs High Flow 1Q10 = 35 cfs 7Q10 = 24 cfs (15.54 mgd) High Flow 7Q10 = 39 cfs 30Q5 = 37 cfs High Flow 30Q10 = 50 cfs HM = 87.9 cfs
Birds Branch Trib. #2, at Groundhog Mountain Resort STP, near Ararat, VA (#02113541), above discharge point: Drainage Area = 0.02 mi2 1Q30 = 0.019 cfs (0.012 mgd) 30Q10 = 0.032 cfs (0.021 mgd) 1Q10 = 0.025 cfs (0.016 mgd) High Flow 1Q10 = 0.035 cfs (0.023 mgd) 7Q10 = 0.026 cfs (0.017 mgd) High Flow 7Q10 = 0.038 cfs (0.030 mgd) 30Q5 = 0.037 cfs (0.024 mgd) High Flow 30Q10 = 0.046 cfs (0.043 mgd) HM = 0.067 cfs (0.043 mgd)
The high flow months are January through June. This analysis does not address any withdrawals or discharges lying upstream of the discharge point.
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WA1STE SLUDGE r* SLUDGE HOLDING TANK (A)
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COMMINUTER &. BAR RACK
INFLUENT CLARIFIER
CHLORINATION
DISCHARGE TO BIRDS 8RANCH
DECHLORINATION POST- EFFLUENT AERATION PUMP STATION EFFLUENT METALS REMOVAL FILTERS
V' a1
Approx. location of discharge.
Portion of USGS Laurel Park Quadrangle in the vicinity of the discharge M E M O R A N D U M VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY BLUE RIDGE REGIONAL OFFICE - ROANOKE WATER DIVISION 3019 Peters Creek Road Roanoke, Virginia 24019-2738
SUBJECT: Site visit for VPDES Permit Reissuance - VA0066575 Groundhog Mountain Resort STP To: VPDES Permit file VA0066575 From: Susan K. Edwards, Environmental Engineer Sr. Date: July 12, 2011
On Tuesday, June 14, 2011, the writer performed a site visit at the Groundhog Mountain Resort STP. Present during the visit was Mr. Robert Reed, the daily plant operator, and Mr. Gary Johnson of Environmental Management Services, Inc, who if the licensed operator who performs sampling and laboratory services for the plant. Mr. Reed is now employed by the Groundhog Mountain Property Owners Association who owns and operates the treatment plant as a public service authority. The facility is a package extended aeration treatment plant with a design capacity of 26,000 gallons per day. It currently treats municipal sewage from 63 seasonally occupied homes in the western portion of the resort subdivision and the Doe Run Lodge, including the restaurant and Conference Center. It does not receive waste from the tennis condominiums and other residences on the eastern ridge of the development. All residences served are seasonal. The permanent residences are served by conventional onsite septic tank & drain field systems. At this time and over the last several years there has been no waste contribution from the Lodge as it is not in operation by its owner. The treatment plant is located between two ridges of the subdivision adjacent to the closed lagoon. An alarm system has been installed with the addition of the metals removal system. The plant is within a locked chain link fence with stored chemicals located within the blower building. The activated sludge basin exhibited the characteristic chocolate coloration of an extended aeration plant. There was no noticeable septic odor to the plant but the normal slightly “musty” odor. There was no significant foam in the aeration basin. There was no carryover of flock from the clarifier into the chlorine contact tank. The plant uses tablet chlorination and dechlorination. Chlorination and dechlorination tablet tubes were well stocked and appeared to be functioning well using two tablet chlorination tube and 3 tablet dechlorination tubes. Flow at the plant is estimated at the discharge side of the dechlorination unit using the discharge weir. A new metals removal treatment system is operating well. Without the flow from the Lodge the sludge holding tank has only been pumped once during the current term. The level is monitored to assess the need. When the Lodge was operating the sludge was pumped twice a year. Effluent travels underground through a PVC pipe along the bank of the branch to the point of discharge. The receiving stream was flowing well during our visit. Effluent exits the discharge pipe onto a natural rock on the bank of the receiving stream. No undesirable growth was noted in the stream. Operational logs record daily weir flow, pH, chlorine and dissolved oxygen. The facility contracts out sampling & analysis of BOD5, TSS, TKN, ammonia and metals through Environmental Management Services of Wytheville. A certified hauler trucks sludge pumped from the holding tank to the Martinsville STP. Log forms, a copy of the Operations & Maintenance manual and a copy of the plans specification for the metals treatment system are maintained in the new metals treatment building. Overall, the plant is in good repair with no obvious areas in need of attention. They would like to see if additional site flow monitoring can be performed during the term to assess the need to continue metals monitoring. 2010 Water Quality Assessment – VAW-M03R
2010 Rivers from DEQ Geographic Information System
ID305B VAW-M03R_ZZZ01A00 MILES 39.332969 CYCLE 2010 STATE VA RIVER NAME Ararat River Tributaries LOCATION Remaining waters in Watershed M03R Class IV. WQS Class IV Sec. 1 PWS No current data. These waters are not AU_COMMENTS assessed. No VDH Fish Consumption or Drinking Water Advisories. AU_OWNER VAW IMP_CAUSE No Data SOURCE No Data CATEGORY 3A AQU_LIFE Not Assessed FISH_CONSU Not Assessed PWS Not Assessed RECREATION Not Assessed WILDLIFE Not Assessed SHAPE.LEN 63300.404568
2010 Impaired Waters Categories 4 and 5 by Cause Group Code
Roanoke and Yadkin River Basins
Cause Group Code: M03R-01-BAC Ararat River
Location: Ararat River mainstem from the VA/NC State Line upstream to the Rt. 823 crossing.
City / County: Patrick Co. Use(s): Recreation Cause(s) / VA Category: Escherichia coli/ 5A 4BARA035.13 (Rt. 739 Bridge, near VA/NC State Line)- 2010 assessment results find escherichia coli (E.coli) exceeds the WQS instantaneous criterion of 235 cfu/100 ml in three of nine samples. Exceeding values range from 250 to 950 cfu/100 ml.
TMDL Cycle Schedule or First EPA Assessment Unit / Water Name / Description Cause Category / Name Nested Listed Approval Size VAW-M03R_ARA01A00 / Ararat River / Ararat River mainstem 5A Escherichia coli 2010 2022 5.97 from the VA/NC State Line upstream to the Rt. 823 crossing.
Ararat River Estuary Reservoir River Recreation (Sq. Miles) (Acres) (Miles) Escherichia coli - Total Impaired Size by Water Type: 5.97
Sources: Livestock (Grazing or On-site Treatment Systems Unspecified Domestic Wet Weather Discharges Feeding Operations) (Septic Systems and Similar Waste (Non-Point Source) Decentralized Systems) Wildlife Other than Waterfowl
Final EPA Approval 2/9/2011 Page 1 2010 Impaired Waters Categories 4 and 5 by Cause Group Code
Roanoke and Yadkin River Basins
Cause Group Code: M03R-01-HG Ararat River
Location: Ararat River mainstem from the VA/NC State Line upstream to the Rt. 823 crossing.
City / County: Patrick Co. Use(s): Fish Consumption Cause(s) / VA Category: Mercury in Fish Tissue/ 5A This initial 2010 303(d) Listing is based on 2007 fish tissue collections and new Water Quality Standards (WQS) effective 2/01/2010. Mercury (Hg) exceedances of the DEQ 0.3 parts per million (ppm) tissue value cause impairment of the Fish Consumption Use. No VDH Fish Consumption or Drinking Water Advisories are issued for mercury for these waters. The Virginia Department of Health (VDH) level of concern is 0.5 ppm. Please visit http://www.deq.virginia.gov/info/mercury.html for more information about mercury contamination and http://www.vdh.virginia.gov/Epidemiology/dee/PublicHealthToxicology/Advisories/ for VDH Advisories or Bans.
4BARA035.07 (Rt. 739 Bridge near VA/NC State Line)- 2007 fish tissue analysis finds mercury (Hg) exceeds the WQS based tissue value (TV) of 0.30 ppm in three species; yellow bullhead catfish (1 fish 27.7 cm) at 0.495 ppm; white sucker (4 fish composite 31.0-39.1 cm) at 0.369 ppm; and two groups of redhorse sucker (6 fish composite 36.5 - 38.6 cm) at 0.535 ppm and (7 fish composite 28.5 - 34.6 cm) at 0.412 ppm. A 2002 golden redhorse sucker collection (4 fish 25.7-34.3 cm) exceeds the WQS TV at 0.35 ppm but outside the 2010 data window.
TMDL Cycle Schedule or First EPA Assessment Unit / Water Name / Description Cause Category / Name Nested Listed Approval Size VAW-M03R_ARA01A00 / Ararat River / Ararat River mainstem 5A Mercury in Fish Tissue 2010 2022 5.97 from the VA/NC State Line upstream to the Rt. 823 crossing.
Ararat River Estuary Reservoir River Fish Consumption (Sq. Miles) (Acres) (Miles) Mercury in Fish Tissue - Total Impaired Size by Water Type: 5.97
Sources: Source Unknown
Final EPA Approval 2/9/2011 Page 2 STORET monitoring data summary Station 4BARA035.13 Route 739 bridge near Virginia/North Carolina line Ararat River, Patrick County, VA Wet season Field Sorted Field Sorted Temps Date hardness Date pH pH temp temp Jan-June 1/24/1994 12 7/27/1988 8.1 6.3 21.9 3.7 6.3 10/27/1993 22 10/24/1988 8.15 7 11 5 8.8 4/14/1993 10 4/17/1989 7.14 7.1 14.2 5.4 10.2 1/25/1993 16 7/26/1989 7.19 7.14 21.1 5.9 11.9 10/19/1992 20 10/10/1989 7.27 7.19 11.3 6.3 13 7/15/1992 18 1/16/1990 7.59 7.2 6.3 6.5 6.5 4/7/1992 18 3/6/1990 8.13 7.2 8.8 6.8 21.5 1/28/1992 22 4/9/1990 7.53 7.27 10.2 8.2 6.8 10/22/1991 16 7/11/1990 7.63 7.3 22.7 8.8 12.5 1/14/1991 20 10/22/1990 7.2 7.3 15 8.9 5.9 7/11/1990 16 1/14/1991 7.68 7.4 5.4 10.2 13.7 4/9/1990 12 10/22/1991 7.9 7.4 11.6 11 20.2 3/6/1990 17 1/28/1992 7.4 7.4 11.9 11.3 1/16/1990 14 4/7/1992 8.24 7.4 13 11.6 sorted 10/10/1989 15 7/15/1992 8.5 7.5 23 11.9 Wet season 10/10/1989 14 10/19/1992 8.1 7.53 8.9 12.5 Jan-June 7/26/1989 20 1/25/1993 7.4 7.59 6.5 13 5.9 4/17/1989 14 4/14/1993 8.1 7.6 21.5 13.7 6.3 7/27/1988 22 7/15/1993 7.9 7.63 23.5 14.2 6.5 10/27/1993 7.9 7.68 14.5 14.5 6.8 average -> 16.74 1/24/1994 7.4 7.8 6.8 15 8.8 4/6/1994 7.6 7.9 12.5 15 10.2 8/24/2005 7.8 7.9 22 20.2 11.9 10/25/2005 7.4 7.9 8.2 21.1 12.5 12/7/2005 7.2 8.1 3.7 21.5 13 2/16/2006 7.3 8.1 5.9 21.9 13.7 4/19/2006 7.3 8.1 13.7 22 20.2 6/28/2006 7.1 8.13 20.2 22.7 21.5 8/30/2006 7 8.15 23.8 23 10/3/2006 6.3 8.24 15 23.5 12/5/2006 7.5 8.5 5 23.8
<- 90th percentile value of max pH & temperature <- 10th percentile value of max pH
STORET data 4BARA035.13
VPDES Permit VA0066575 Groundhog Mountain Resort STP Reissuance September 2011
ATTACHMENT B
1. 3-year summary of effluent monitoring data - flow, pH, BOD5, Ammonia, DO, TSS, chlorine, ammonia, copper and zinc.
2. Mixing zone analysis output file from MIXER.exe version 2.1 reflecting mix results for 6 flows used in waste load allocation spreadsheet.
3. Input & output dissolved oxygen files from Regional Modeling System 3.2 for free flowing streams. Flow, BOD5, TKN & temperature limit confirmation from 2007 reissuance.
4. Waste Load Allocation spreadsheet (MSTRANTI version 2a) updated.
5. Toxics effluent limit evaluation output files from STATS.exe software - ammonia, total residual chlorine, copper & zinc.
DMR Data Summary VPDES Permit VA0066575 Groundhog Mountain STP
Flow pH BOD 5-day TSS DO
DMR Qty Qty Qty Qty Conc Conc Qty Qty Conc Conc Conc Due Date Avg Max Min Max Avg Max Avg Max Avg Max Avg Max Min (MGD) (MGD) (SU) (SU) (kg/d) (kg/d) (mg/L) (mg/L) (kg/d) (kg/d) (mg/L) (mg/L) (mg/L) 10-Jun-08 0.0002 0.0003 6.2 6.9 0.0033 0.0033 8.6 8.6 0.0036 0.0036 9.4 9.4 7.6 10-Jul-08 0.0002 0.0006 6 7.4 limits > NL 0.026 6.0 9.0 3.0 4.4 30 45 3.0 4.4 30 45 6.0 DMR Data Summary VPDES Permit VA0066575 Groundhog Mountain STP Chlorine Chlorine Chlorine, total total contact inst tech min Ammonia Copper, total as Cu Qrtrly monitoring DMR Conc Conc Conc Conc Conc Conc Conc Conc Due Date Avg Max Min Min Avg Max Avg Max (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) 10-Jun-08 Effluent Flow = 0.026 MGD Stream slope = 0.4 ft/ft Stream 7Q10 = 0.017 MGD Stream 30Q5 = 0.0236 MGD Stream width = 1 ft Stream 30Q10 = 0.0207 MGD Stream high flow 30Q10 = 0.0227 MGD Bottom scale = 5 Stream 1Q10 = 0.016 MGD Stream high flow 1Q10 = 0.0297 MGD Channel scale = 1 Mixing Zone Predictions @ 7Q10 Depth = .0741 ft Length = 4.94 ft Velocity = .8942 ft/sec Residence Time = .0001 days Recommendation: A complete mix assumption is appropriate for this situation and the entire 7Q10 may be used. Mixing Zone Predictions @ 30Q10 Depth = .0784 ft Length = 4.68 ft Velocity = .9216 ft/sec Residence Time = .0001 days Recommendation: A complete mix assumption is appropriate for this situation and the entire 30Q10 may be used. Mixing Zone Predictions @ 1Q10 Depth = .0732 ft Length = 4.99 ft Velocity = .8866 ft/sec Residence Time = .0016 hours Recommendation: A complete mix assumption is appropriate for this situation and the entire 1Q10 may be used. Mixing Zone Predictions @ 30Q5 Depth = .0815 ft Length = 4.52 ft Velocity = .942 ft/sec Residence Time = .0001 days Recommendation: A complete mix assumption is appropriate for this situation and the entire 30Q5 may be used. Mixing Zone Predictions @ high flow 30Q10 Depth = .0805 ft Length = 4.56 ft Velocity = .9358 ft/sec Residence Time = .0001 days Recommendation: A complete mix assumption is appropriate for this situation and the entire high flow 30Q10 may be used. Mixing Zone Predictions @ high flow 1Q10 Depth = .0877 ft Length = 4.22 ft Velocity = .9826 ft/sec Residence Time = .0012 hours Recommendation: A complete mix assumption is appropriate for this situation and the entire high flow 1Q10 may be used. Virginia DEQ Mixing Zone Analysis Version 2.1 Model is for UT TO BIRDS BRANCH Model starts at the GROUNDHOG MTN RESORT STP discharge Background Data 7Q10 cBOD5 TKN DO Temp (mgd) (mg/l) (mg/l) (mg/l) deg C .017 2 0 7.442 20 Discharge/Tributary Input Data for Segment 1 Flow cBOD5 TKN DO Temp (mgd) (mg/l) (mg/l) (mg/l) deg C .026 30 8 6 20 Hydraulic Information for Segment 1 Length Width Depth Velocity (mi) (ft) (ft) (ft/sec) 0.2 0.499 0.138 0.961 Initial Mix Values for Segment 1 Flow DO cBOD nBOD DO Sat Temp (mgd) (mg/l) (mg/l) (mg/l) (mg/l) (deg C) .043 6.57 47.326 13.091 8.332 20 Rate Constants for Segment 1. - (All units Per Day) k1 k1@T k2 k2@T kn kn@T BD BD@T 1.6 1.6 20 20 .55 .55 0 0 Output for Segment 1 Segment starts at GROUNDHOG MTN RESORT STP Total Segm. Dist. Dist. DO cBOD nBOD (mi) (mi) (mg/l) (mg/l) (mg/l) 0 0 6.57 47.326 13.091 .1 .1 6.288 46.847 13.045 .2 .2 6.044 46.373 12.999 Discharge/Tributary Input Data for Segment 2 Flow cBOD5 TKN DO Temp (mgd) (mg/l) (mg/l) (mg/l) deg C 0 0 0 0 0 Incremental Flow Input Data for Segment 2 Flow cBOD5 TKN DO Temp (mgd) (mg/l) (mg/l) (mg/l) deg C .032 2 0 7.6 20 Hydraulic Information for Segment 2 Length Width Depth Velocity (mi) (ft) (ft) (ft/sec) .225 .9 .116 .895 Initial Mix Values for Segment 2 Flow DO cBOD nBOD DO Sat Temp (mgd) (mg/l) (mg/l) (mg/l) (mg/l) (deg C) .075 6.708 28.721 7.453 8.444 20 DO Model Output file Rate Constants for Segment 2. - (All units Per Day) k1 k1@T k2 k2@T kn kn@T BD BD@T 1.4 1.4 20 20 .5 .5 0 0 Output for Segment 2 Total Segm. Dist. Dist. DO cBOD nBOD (mi) (mi) (mg/l) (mg/l) (mg/l) .2 0 6.708 28.721 7.453 .3 .1 6.65 28.448 7.428 .4 .2 6.602 28.177 7.403 .425 .225 6.591 28.11 7.397 Discharge/Tributary Input Data for Segment 3 Flow cBOD5 TKN DO Temp (mgd) (mg/l) (mg/l) (mg/l) deg C 0 0 0 0 0 Incremental Flow Input Data for Segment 3 Flow cBOD5 TKN DO Temp (mgd) (mg/l) (mg/l) (mg/l) deg C .026 2 0 7.657 20 Hydraulic Information for Segment 3 Length Width Depth Velocity (mi) (ft) (ft) (ft/sec) .15 1.301 .078 .815 Initial Mix Values for Segment 3 Flow DO cBOD nBOD DO Sat Temp (mgd) (mg/l) (mg/l) (mg/l) (mg/l) (deg C) .101 6.865 22.161 5.493 8.508 20 Rate Constants for Segment 3. - (All units Per Day) k1 k1@T k2 k2@T kn kn@T BD BD@T 1.4 1.4 20 20 .5 .5 0 0 Output for Segment 3 Total Segm. Dist. Dist. DO cBOD nBOD (mi) (mi) (mg/l) (mg/l) (mg/l) .425 0 6.865 22.161 5.493 .525 .1 6.86 21.93 5.472 .575 .15 6.859 21.815 5.462 "END OF FILE" Model Run for C:\Documents and Settings\skedwards\My Documents\Working files\VPDES\Groundhog Mtn STP\2007 reissuance\DOmodel07 3.mod On 7/9/2007 11:05:37 am DO Model Output file FRESHWATER WATER QUALITY CRITERIA / WASTELOAD ALLOCATION ANALYSIS Facility Name: Groundhog Mtn Resort STP Permit No.: VA0066575 Receiving Stream: UT to Birds Branch Version: OWP Guidance Memo 00-2011 (8/24/00) 7.4E-09 7.4E-09 2.512E-08 Stream Information 7.2E-08 Stream Flows Mixing Information Effluent Information 2E-07 1.995E-07 Mean Hardness (as CaCO3) = 16.74 mg/L 1Q10 (Annual) = 0.016 MGD Annual - 1Q10 Mix = 100 % Mean Hardness (as CaCO3) = 34 mg/L 90% Temperature (Annual) = 22.7 deg C 7Q10 (Annual) = 0.017 MGD - 7Q10 Mix = 100 % 90% Temp (Annual) = 22.7 deg C 90% Temperature (Wet season) = 13.7 deg C 30Q10 (Annual) = 0.021 MGD - 30Q10 Mix = 100 % 90% Temp (Wet season) = 13.7 deg C 90% Maximum pH = 8.13 SU 1Q10 (Wet season) = 0.023 MGD Wet Season - 1Q10 Mix = 100 % 90% Maximum pH = 7.6 SU 10% Maximum pH = 7.14 SU 30Q10 (Wet season) = 0.043 MGD - 30Q10 Mix = 100 % 10% Maximum pH = 6.7 SU Tier Designation (1 or 2) = 2 30Q5 = 0.024 MGD Discharge Flow = 0.026 MGD Public Water Supply (PWS) Y/N? = y Harmonic Mean = 0.043 MGD Trout Present Y/N? = n Early Life Stages Present Y/N? = y Parameter Background Water Quality Criteria Wasteload Allocations Antidegradation Baseline Antidegradation Allocations Most Limiting Allocations (ug/l unless noted) Conc. Acute Chronic HH (PWS) HH Acute Chronic HH (PWS) HH Acute Chronic HH (PWS) HH Acute Chronic HH (PWS) HH Acute Chronic HH (PWS) HH Acenapthene 5 -- -- 6.7E+02 9.9E+02 -- -- 1.3E+03 1.9E+03 -- -- 7.2E+01 1.0E+02 -- -- 1.3E+02 1.9E+02 -- -- 1.3E+02 1.9E+02 Acrolein 0 -- -- 6.1E+00 9.3E+00 -- -- 1.2E+01 1.8E+01 -- -- 6.1E-01 9.3E-01 -- -- 1.2E+00 1.8E+00 -- -- 1.2E+00 1.8E+00 C Acrylonitrile 0 -- -- 5.1E-01 2.5E+00 -- -- 1.4E+00 6.6E+00 -- -- 5.1E-02 2.5E-01 -- -- 1.4E-01 6.6E-01 -- -- 1.4E-01 6.6E-01 C Aldrin 0 3.0E+00 -- 4.9E-04 5.0E-04 4.8E+00 -- 1.3E-03 1.3E-03 7.5E-01 -- 4.9E-05 5.0E-05 1.2E+00 -- 1.3E-04 1.3E-04 1.2E+00 -- 1.3E-04 1.3E-04 Ammonia-N (mg/l) (Yearly) 0 1.36E+01 1.96E+00 -- -- 2.19E+01 3.54E+00 -- -- 3.40E+00 4.90E-01 -- -- 5.49E+00 8.86E-01 -- -- 5.49E+00 8.86E-01 -- -- Ammonia-N (mg/l) (High Flow) 0 1.27E+01 2.98E+00 -- -- 2.39E+01 7.92E+00 -- -- 3.17E+00 7.46E-01 -- -- 5.98E+00 1.98E+00 -- -- 5.98E+00 1.98E+00 -- -- Anthracene 0 -- -- 8.3E+03 4.0E+04 -- -- 1.6E+04 7.7E+04 -- -- 8.3E+02 4.0E+03 -- -- 1.6E+03 7.7E+03 -- -- 1.6E+03 7.7E+03 Antimony 0 -- -- 5.6E+00 6.4E+02 -- -- 1.1E+01 1.2E+03 -- -- 5.6E-01 6.4E+01 -- -- 1.1E+00 1.2E+02 -- -- 1.1E+00 1.2E+02 Arsenic o 3.4E+02 1.5E+02 1.0E+01 -- 5.5E+02 2.5E+02 1.9E+01 -- 8.5E+01 3.8E+01 1.0E+00 -- 1.4E+02 6.2E+01 1.9E+00 -- 1.4E+02 6.2E+01 1.9E+00 -- Barium 0 -- -- 2.0E+03 ------3.8E+03 ------2.0E+02 ------3.8E+02 ------3.8E+02 -- C Benzene 0 -- -- 2.2E+01 5.1E+02 -- -- 5.8E+01 1.4E+03 -- -- 2.2E+00 5.1E+01 -- -- 5.8E+00 1.4E+02 -- -- 5.8E+00 1.4E+02 C Benzidine 0 -- -- 8.6E-04 2.0E-03 -- -- 2.3E-03 5.3E-03 -- -- 8.6E-05 2.0E-04 -- -- 2.3E-04 5.3E-04 -- -- 2.3E-04 5.3E-04 C Benzo (a) anthracene 0 -- -- 3.8E-02 1.8E-01 -- -- 1.0E-01 4.8E-01 -- -- 3.8E-03 1.8E-02 -- -- 1.0E-02 4.8E-02 -- -- 1.0E-02 4.8E-02 C Benzo (b) fluoranthene 0 -- -- 3.8E-02 1.8E-01 -- -- 1.0E-01 4.8E-01 -- -- 3.8E-03 1.8E-02 -- -- 1.0E-02 4.8E-02 -- -- 1.0E-02 4.8E-02 C Benzo (k) fluoranthene 0 -- -- 3.8E-02 1.8E-01 -- -- 1.0E-01 4.8E-01 -- -- 3.8E-03 1.8E-02 -- -- 1.0E-02 4.8E-02 -- -- 1.0E-02 4.8E-02 C Benzo (a) pyrene 0 -- -- 3.8E-02 1.8E-01 -- -- 1.0E-01 4.8E-01 -- -- 3.8E-03 1.8E-02 -- -- 1.0E-02 4.8E-02 -- -- 1.0E-02 4.8E-02 C Bis2-Chloroethyl Ether 0 -- -- 3.0E-01 5.3E+00 -- -- 8.0E-01 1.4E+01 -- -- 3.0E-02 5.3E-01 -- -- 8.0E-02 1.4E+00 -- -- 8.0E-02 1.4E+00 Bis2-Chloroisopropyl Ether 0 -- -- 1.4E+03 6.5E+04 -- -- 2.7E+03 1.3E+05 -- -- 1.4E+02 6.5E+03 -- -- 2.7E+02 1.3E+04 -- -- 2.7E+02 1.3E+04 C Bis 2-Ethylhexyl Phthalate 0 -- -- 1.2E+01 2.2E+01 -- -- 3.2E+01 5.8E+01 -- -- 1.2E+00 2.2E+00 -- -- 3.2E+00 5.8E+00 -- -- 3.2E+00 5.8E+00 C Bromoform 0 -- -- 4.3E+01 1.4E+03 -- -- 1.1E+02 3.7E+03 -- -- 4.3E+00 1.4E+02 -- -- 1.1E+01 3.7E+02 -- -- 1.1E+01 3.7E+02 Butylbenzylphthalate 0 -- -- 1.5E+03 1.9E+03 -- -- 2.9E+03 3.7E+03 -- -- 1.5E+02 1.9E+02 -- -- 2.9E+02 3.7E+02 -- -- 2.9E+02 3.7E+02 Cadmium 0 9.1E-01 4.1E-01 5.0E+00 -- 1.5E+00 6.7E-01 9.6E+00 -- 2.3E-01 1.0E-01 5.0E-01 -- 3.7E-01 1.7E-01 9.6E-01 -- 3.7E-01 1.7E-01 9.6E-01 -- C Carbon Tetrachloride 0 -- -- 2.3E+00 1.6E+01 -- -- 6.1E+00 4.2E+01 -- -- 2.3E-01 1.6E+00 -- -- 6.1E-01 4.2E+00 -- -- 6.1E-01 4.2E+00 C Chlordane 0 2.4E+00 4.3E-03 8.0E-03 8.1E-03 3.9E+00 7.1E-03 2.1E-02 2.1E-02 6.0E-01 1.1E-03 8.0E-04 8.1E-04 9.7E-01 1.8E-03 2.1E-03 2.1E-03 9.7E-01 1.8E-03 2.1E-03 2.1E-03 Chloride 0 8.6E+05 2.3E+05 2.5E+05 -- 1.4E+06 3.8E+05 4.8E+05 -- 2.2E+05 5.8E+04 2.5E+04 -- 3.5E+05 9.5E+04 4.8E+04 -- 3.5E+05 9.5E+04 4.8E+04 -- TRC 0 1.9E+01 1.1E+01 -- -- 3.1E+01 1.8E+01 -- -- 4.8E+00 2.8E+00 -- -- 7.7E+00 4.5E+00 -- -- 7.7E+00 4.5E+00 -- -- Chlorobenzene 0 -- -- 1.3E+02 1.6E+03 -- -- 2.5E+02 3.1E+03 -- -- 1.3E+01 1.6E+02 -- -- 2.5E+01 3.1E+02 -- -- 2.5E+01 3.1E+02 page 1 of 4 MSTRANTI 2a - Freshwater WLAs 8/18/2011 Parameter Background Water Quality Criteria Wasteload Allocations Antidegradation Baseline Antidegradation Allocations Most Limiting Allocations (ug/l unless noted) Conc. Acute Chronic HH (PWS) HH Acute Chronic HH (PWS) HH Acute Chronic HH (PWS) HH Acute Chronic HH (PWS) HH Acute Chronic HH (PWS) HH C Chlorodibromomethane 0 -- -- 4.0E+00 1.3E+02 -- -- 1.1E+01 3.5E+02 -- -- 4.0E-01 1.3E+01 -- -- 1.1E+00 3.5E+01 -- -- 1.1E+00 3.5E+01 Chloroform 0 -- -- 3.4E+02 1.1E+04 -- -- 6.5E+02 2.1E+04 -- -- 3.4E+01 1.1E+03 -- -- 6.5E+01 2.1E+03 -- -- 6.5E+01 2.1E+03 2-Chloronaphthalene 0 -- -- 1.0E+03 1.6E+03 -- -- 1.9E+03 3.1E+03 -- -- 1.0E+02 1.6E+02 -- -- 1.9E+02 3.1E+02 -- -- 1.9E+02 3.1E+02 2-Chlorophenol 0 -- -- 8.1E+01 1.5E+02 -- -- 1.6E+02 2.9E+02 -- -- 8.1E+00 1.5E+01 -- -- 1.6E+01 2.9E+01 -- -- 1.6E+01 2.9E+01 Chlorpyrifos 0 8.3E-02 4.1E-02 -- -- 1.3E-01 6.8E-02 -- -- 2.1E-02 1.0E-02 -- -- 3.4E-02 1.7E-02 -- -- 3.4E-02 1.7E-02 -- -- Chromium III 0 2.0E+02 2.5E+01 -- -- 3.2E+02 4.2E+01 -- -- 4.9E+01 6.4E+00 -- -- 8.0E+01 1.1E+01 -- -- 8.0E+01 1.1E+01 -- -- Chromium VI 0 1.6E+01 1.1E+01 -- -- 2.6E+01 1.8E+01 -- -- 4.0E+00 2.8E+00 -- -- 6.5E+00 4.5E+00 -- -- 6.5E+00 4.5E+00 -- -- Chromium, Total 0 -- -- 1.0E+02 ------1.9E+02 ------1.0E+01 ------1.9E+01 ------1.9E+01 -- C Chrysene 0 -- -- 3.8E-03 1.8E-02 -- -- 1.0E-02 4.8E-02 -- -- 3.8E-04 1.8E-03 -- -- 1.0E-03 4.8E-03 -- -- 1.0E-03 4.8E-03 Copper 0 4.0E+00 2.9E+00 1.3E+03 -- 6.4E+00 4.9E+00 2.5E+03 -- 9.9E-01 7.4E-01 1.3E+02 -- 1.6E+00 1.2E+00 2.5E+02 -- 1.6E+00 1.2E+00 2.5E+02 -- Cyanide, Free 0 2.2E+01 5.2E+00 1.4E+02 1.6E+04 3.6E+01 8.6E+00 2.7E+02 3.1E+04 5.5E+00 1.3E+00 1.4E+01 1.6E+03 8.9E+00 2.2E+00 2.7E+01 3.1E+03 8.9E+00 2.2E+00 2.7E+01 3.1E+03 C DDD 0 -- -- 3.1E-03 3.1E-03 -- -- 8.2E-03 8.2E-03 -- -- 3.1E-04 3.1E-04 -- -- 8.2E-04 8.2E-04 -- -- 8.2E-04 8.2E-04 C DDE 0 -- -- 2.2E-03 2.2E-03 -- -- 5.8E-03 5.8E-03 -- -- 2.2E-04 2.2E-04 -- -- 5.8E-04 5.8E-04 -- -- 5.8E-04 5.8E-04 C DDT 0 1.1E+00 1.0E-03 2.2E-03 2.2E-03 1.8E+00 1.7E-03 5.8E-03 5.8E-03 2.8E-01 2.5E-04 2.2E-04 2.2E-04 4.4E-01 4.1E-04 5.8E-04 5.8E-04 4.4E-01 4.1E-04 5.8E-04 5.8E-04 Demeton 0 -- 1.0E-01 ------1.7E-01 ------2.5E-02 ------4.1E-02 ------4.1E-02 -- -- Diazinon 0 1.7E-01 1.7E-01 -- -- 2.7E-01 2.8E-01 -- -- 4.3E-02 4.3E-02 -- -- 6.9E-02 7.0E-02 -- -- 6.9E-02 7.0E-02 -- -- C Dibenz(a,h)anthracene 0 -- -- 3.8E-02 1.8E-01 -- -- 1.0E-01 4.8E-01 -- -- 3.8E-03 1.8E-02 -- -- 1.0E-02 4.8E-02 -- -- 1.0E-02 4.8E-02 1,2-Dichlorobenzene 0 -- -- 4.2E+02 1.3E+03 -- -- 8.1E+02 2.5E+03 -- -- 4.2E+01 1.3E+02 -- -- 8.1E+01 2.5E+02 -- -- 8.1E+01 2.5E+02 1,3-Dichlorobenzene 0 -- -- 3.2E+02 9.6E+02 -- -- 6.2E+02 1.8E+03 -- -- 3.2E+01 9.6E+01 -- -- 6.2E+01 1.8E+02 -- -- 6.2E+01 1.8E+02 1,4-Dichlorobenzene 0 -- -- 6.3E+01 1.9E+02 -- -- 1.2E+02 3.7E+02 -- -- 6.3E+00 1.9E+01 -- -- 1.2E+01 3.7E+01 -- -- 1.2E+01 3.7E+01 C 3,3-Dichlorobenzidine 0 -- -- 2.1E-01 2.8E-01 -- -- 5.6E-01 7.4E-01 -- -- 2.1E-02 2.8E-02 -- -- 5.6E-02 7.4E-02 -- -- 5.6E-02 7.4E-02 C Dichlorobromomethane 0 -- -- 5.5E+00 1.7E+02 -- -- 1.5E+01 4.5E+02 -- -- 5.5E-01 1.7E+01 -- -- 1.5E+00 4.5E+01 -- -- 1.5E+00 4.5E+01 C 1,2-Dichloroethane 0 -- -- 3.8E+00 3.7E+02 -- -- 1.0E+01 9.8E+02 -- -- 3.8E-01 3.7E+01 -- -- 1.0E+00 9.8E+01 -- -- 1.0E+00 9.8E+01 1,1-Dichloroethylene 0 -- -- 3.3E+02 7.1E+03 -- -- 6.3E+02 1.4E+04 -- -- 3.3E+01 7.1E+02 -- -- 6.3E+01 1.4E+03 -- -- 6.3E+01 1.4E+03 1,2-trans-dichloroethylene 0 -- -- 1.4E+02 1.0E+04 -- -- 2.7E+02 1.9E+04 -- -- 1.4E+01 1.0E+03 -- -- 2.7E+01 1.9E+03 -- -- 2.7E+01 1.9E+03 2,4-Dichlorophenol 0 -- -- 7.7E+01 2.9E+02 -- -- 1.5E+02 5.6E+02 -- -- 7.7E+00 2.9E+01 -- -- 1.5E+01 5.6E+01 -- -- 1.5E+01 5.6E+01 2,4-Dichlorophenoxy acetic acid (2,4-D) 0 -- -- 1.0E+02 ------1.9E+02 ------1.0E+01 ------1.9E+01 ------1.9E+01 -- 1,2-DichloropropaneC 0 -- -- 5.0E+00 1.5E+02 -- -- 1.3E+01 4.0E+02 -- -- 5.0E-01 1.5E+01 -- -- 1.3E+00 4.0E+01 -- -- 1.3E+00 4.0E+01 1,3-Dichloropropene C 0 -- -- 3.4E+00 2.1E+02 -- -- 9.0E+00 5.6E+02 -- -- 3.4E-01 2.1E+01 -- -- 9.0E-01 5.6E+01 -- -- 9.0E-01 5.6E+01 C Dieldrin 0 2.4E-01 5.6E-02 5.2E-04 5.4E-04 3.9E-01 9.3E-02 1.4E-03 1.4E-03 6.0E-02 1.4E-02 5.2E-05 5.4E-05 9.7E-02 2.3E-02 1.4E-04 1.4E-04 9.7E-02 2.3E-02 1.4E-04 1.4E-04 Diethyl Phthalate 0 -- -- 1.7E+04 4.4E+04 -- -- 3.3E+04 8.5E+04 -- -- 1.7E+03 4.4E+03 -- -- 3.3E+03 8.5E+03 -- -- 3.3E+03 8.5E+03 2,4-Dimethylphenol 0 -- -- 3.8E+02 8.5E+02 -- -- 7.3E+02 1.6E+03 -- -- 3.8E+01 8.5E+01 -- -- 7.3E+01 1.6E+02 -- -- 7.3E+01 1.6E+02 Dimethyl Phthalate 0 -- -- 2.7E+05 1.1E+06 -- -- 5.2E+05 2.1E+06 -- -- 2.7E+04 1.1E+05 -- -- 5.2E+04 2.1E+05 -- -- 5.2E+04 2.1E+05 Di-n-Butyl Phthalate 0 -- -- 2.0E+03 4.5E+03 -- -- 3.8E+03 8.7E+03 -- -- 2.0E+02 4.5E+02 -- -- 3.8E+02 8.7E+02 -- -- 3.8E+02 8.7E+02 2,4 Dinitrophenol 0 -- -- 6.9E+01 5.3E+03 -- -- 1.3E+02 1.0E+04 -- -- 6.9E+00 5.3E+02 -- -- 1.3E+01 1.0E+03 -- -- 1.3E+01 1.0E+03 2-Methyl-4,6-Dinitrophenol 0 -- -- 1.3E+01 2.8E+02 -- -- 2.5E+01 5.4E+02 -- -- 1.3E+00 2.8E+01 -- -- 2.5E+00 5.4E+01 -- -- 2.5E+00 5.4E+01 C 2,4-Dinitrotoluene 0 -- -- 1.1E+00 3.4E+01 -- -- 2.9E+00 9.0E+01 -- -- 1.1E-01 3.4E+00 -- -- 2.9E-01 9.0E+00 -- -- 2.9E-01 9.0E+00 Dioxin 2,3,7,8- tetrachlorodibenzo-p-dioxin 0 -- -- 5.0E-08 5.1E-08 -- -- 9.6E-08 9.8E-08 -- -- 5.0E-09 5.1E-09 -- -- 9.6E-09 9.8E-09 -- -- 9.6E-09 9.8E-09 C 1,2-Diphenylhydrazine 0 -- -- 3.6E-01 2.0E+00 -- -- 9.6E-01 5.3E+00 -- -- 3.6E-02 2.0E-01 -- -- 9.6E-02 5.3E-01 -- -- 9.6E-02 5.3E-01 Alpha-Endosulfan 0 2.2E-01 5.6E-02 6.2E+01 8.9E+01 3.6E-01 9.3E-02 1.2E+02 1.7E+02 5.5E-02 1.4E-02 6.2E+00 8.9E+00 8.9E-02 2.3E-02 1.2E+01 1.7E+01 8.9E-02 2.3E-02 1.2E+01 1.7E+01 Beta-Endosulfan 0 2.2E-01 5.6E-02 6.2E+01 8.9E+01 3.6E-01 9.3E-02 1.2E+02 1.7E+02 5.5E-02 1.4E-02 6.2E+00 8.9E+00 8.9E-02 2.3E-02 1.2E+01 1.7E+01 8.9E-02 2.3E-02 1.2E+01 1.7E+01 Alpha + Beta Endosulfan 0 2.2E-01 5.6E-02 -- -- 3.6E-01 9.3E-02 -- -- 5.5E-02 1.4E-02 -- -- 8.9E-02 2.3E-02 -- -- 8.9E-02 2.3E-02 -- -- Endosulfan Sulfate 0 -- -- 6.2E+01 8.9E+01 -- -- 1.2E+02 1.7E+02 -- -- 6.2E+00 8.9E+00 -- -- 1.2E+01 1.7E+01 -- -- 1.2E+01 1.7E+01 Endrin 0 8.6E-02 3.6E-02 5.9E-02 6.0E-02 1.4E-01 6.0E-02 1.1E-01 1.2E-01 2.2E-02 9.0E-03 5.9E-03 6.0E-03 3.5E-02 1.5E-02 1.1E-02 1.2E-02 3.5E-02 1.5E-02 1.1E-02 1.2E-02 Endrin Aldehyde 0 -- -- 2.9E-01 3.0E-01 -- -- 5.6E-01 5.8E-01 -- -- 2.9E-02 3.0E-02 -- -- 5.6E-02 5.8E-02 -- -- 5.6E-02 5.8E-02 page 2 of 4 MSTRANTI 2a - Freshwater WLAs 8/18/2011 Parameter Background Water Quality Criteria Wasteload Allocations Antidegradation Baseline Antidegradation Allocations Most Limiting Allocations (ug/l unless noted) Conc. Acute Chronic HH (PWS) HH Acute Chronic HH (PWS) HH Acute Chronic HH (PWS) HH Acute Chronic HH (PWS) HH Acute Chronic HH (PWS) HH Ethylbenzene 0 -- -- 5.3E+02 2.1E+03 -- -- 1.0E+03 4.0E+03 -- -- 5.3E+01 2.1E+02 -- -- 1.0E+02 4.0E+02 -- -- 1.0E+02 4.0E+02 Fluoranthene 0 -- -- 1.3E+02 1.4E+02 -- -- 2.5E+02 2.7E+02 -- -- 1.3E+01 1.4E+01 -- -- 2.5E+01 2.7E+01 -- -- 2.5E+01 2.7E+01 Fluorene 0 -- -- 1.1E+03 5.3E+03 -- -- 2.1E+03 1.0E+04 -- -- 1.1E+02 5.3E+02 -- -- 2.1E+02 1.0E+03 -- -- 2.1E+02 1.0E+03 Foaming Agents 0 -- -- 5.0E+02 ------9.6E+02 ------5.0E+01 ------9.6E+01 ------9.6E+01 -- Guthion 0 -- 1.0E-02 ------1.7E-02 ------2.5E-03 ------4.1E-03 ------4.1E-03 -- -- C Heptachlor 0 5.2E-01 3.8E-03 7.9E-04 7.9E-04 8.4E-01 6.3E-03 2.1E-03 2.1E-03 1.3E-01 9.5E-04 7.9E-05 7.9E-05 2.1E-01 1.6E-03 2.1E-04 2.1E-04 2.1E-01 1.6E-03 2.1E-04 2.1E-04 C Heptachlor Epoxide 0 5.2E-01 3.8E-03 3.9E-04 3.9E-04 8.4E-01 6.3E-03 1.0E-03 1.0E-03 1.3E-01 9.5E-04 3.9E-05 3.9E-05 2.1E-01 1.6E-03 1.0E-04 1.0E-04 2.1E-01 1.6E-03 1.0E-04 1.0E-04 C Hexachlorobenzene 0 -- -- 2.8E-03 2.9E-03 -- -- 7.4E-03 7.7E-03 -- -- 2.8E-04 2.9E-04 -- -- 7.4E-04 7.7E-04 -- -- 7.4E-04 7.7E-04 C Hexachlorobutadiene 0 -- -- 4.4E+00 1.8E+02 -- -- 1.2E+01 4.8E+02 -- -- 4.4E-01 1.8E+01 -- -- 1.2E+00 4.8E+01 -- -- 1.2E+00 4.8E+01 Hexachlorocyclohexane C Alpha-BHC 0 -- -- 2.6E-02 4.9E-02 -- -- 6.9E-02 1.3E-01 -- -- 2.6E-03 4.9E-03 -- -- 6.9E-03 1.3E-02 -- -- 6.9E-03 1.3E-02 Hexachlorocyclohexane C Beta-BHC 0 -- -- 9.1E-02 1.7E-01 -- -- 2.4E-01 4.5E-01 -- -- 9.1E-03 1.7E-02 -- -- 2.4E-02 4.5E-02 -- -- 2.4E-02 4.5E-02 Hexachlorocyclohexane C Gamma-BHC (Lindane) 0 9.5E-01 -- 9.8E-01 1.8E+00 1.5E+00 -- 2.6E+00 4.8E+00 2.4E-01 -- 9.8E-02 1.8E-01 3.8E-01 -- 2.6E-01 4.8E-01 3.8E-01 -- 2.6E-01 4.8E-01 Hexachlorocyclopentadiene 0 -- -- 4.0E+01 1.1E+03 -- -- 7.7E+01 2.1E+03 -- -- 4.0E+00 1.1E+02 -- -- 7.7E+00 2.1E+02 -- -- 7.7E+00 2.1E+02 HexachloroethaneC 0 -- -- 1.4E+01 3.3E+01 -- -- 3.7E+01 8.8E+01 -- -- 1.4E+00 3.3E+00 -- -- 3.7E+00 8.8E+00 -- -- 3.7E+00 8.8E+00 Hydrogen Sulfide 0 -- 2.0E+00 ------3.3E+00 ------5.0E-01 ------8.3E-01 ------8.3E-01 -- -- C Indeno (1,2,3-cd) pyrene 0 -- -- 3.8E-02 1.8E-01 -- -- 1.0E-01 4.8E-01 -- -- 3.8E-03 1.8E-02 -- -- 1.0E-02 4.8E-02 -- -- 1.0E-02 4.8E-02 Iron 0 -- -- 3.0E+02 ------5.8E+02 ------3.0E+01 ------5.8E+01 ------5.8E+01 -- C Isophorone 0 -- -- 3.5E+02 9.6E+03 -- -- 9.3E+02 2.5E+04 -- -- 3.5E+01 9.6E+02 -- -- 9.3E+01 2.5E+03 -- -- 9.3E+01 2.5E+03 Kepone 0 -- 0.0E+00 ------0.0E+00 ------0.0E+00 ------0.0E+00 ------0.0E+00 -- -- Lead 0 2.3E+01 2.6E+00 1.5E+01 -- 3.7E+01 4.3E+00 2.9E+01 -- 5.7E+00 6.4E-01 1.5E+00 -- 9.3E+00 1.1E+00 2.9E+00 -- 9.3E+00 1.1E+00 2.9E+00 -- Malathion 0 -- 1.0E-01 ------1.7E-01 ------2.5E-02 ------4.1E-02 ------4.1E-02 -- -- Manganese 0 -- -- 5.0E+01 ------9.6E+01 ------5.0E+00 ------9.6E+00 ------9.6E+00 -- Mercury 0 1.4E+00 7.7E-01 - - - - 2.3E+00 1.3E+00 - - - - 3.5E-01 1.9E-01 - - -- 5.7E-01 3.2E-01 - - -- 5.7E-01 3.2E-01 - - - - Methyl Bromide 0 -- -- 4.7E+01 1.5E+03 -- -- 9.0E+01 2.9E+03 -- -- 4.7E+00 1.5E+02 -- -- 9.0E+00 2.9E+02 -- -- 9.0E+00 2.9E+02 C Methylene Chloride 0 -- -- 4.6E+01 5.9E+03 -- -- 1.2E+02 1.6E+04 -- -- 4.6E+00 5.9E+02 -- -- 1.2E+01 1.6E+03 -- -- 1.2E+01 1.6E+03 Methoxychlor 0 -- 3.0E-02 1.0E+02 -- -- 5.0E-02 1.9E+02 -- -- 7.5E-03 1.0E+01 -- -- 1.2E-02 1.9E+01 -- -- 1.2E-02 1.9E+01 -- Mirex 0 -- 0.0E+00 ------0.0E+00 ------0.0E+00 ------0.0E+00 ------0.0E+00 -- -- Nickel 0 6.1E+01 6.7E+00 6.1E+02 4.6E+03 9.9E+01 1.1E+01 1.2E+03 8.8E+03 1.5E+01 1.7E+00 6.1E+01 4.6E+02 2.5E+01 2.8E+00 1.2E+02 8.8E+02 2.5E+01 2.8E+00 1.2E+02 8.8E+02 Nitrate (as N) 0 -- -- 1.0E+04 ------1.9E+04 ------1.0E+03 ------1.9E+03 ------1.9E+03 -- Nitrobenzene 0 -- -- 1.7E+01 6.9E+02 -- -- 3.3E+01 1.3E+03 -- -- 1.7E+00 6.9E+01 -- -- 3.3E+00 1.3E+02 -- -- 3.3E+00 1.3E+02 C N-Nitrosodimethylamine 0 -- -- 6.9E-03 3.0E+01 -- -- 1.8E-02 8.0E+01 -- -- 6.9E-04 3.0E+00 -- -- 1.8E-03 8.0E+00 -- -- 1.8E-03 8.0E+00 C N-Nitrosodiphenylamine 0 -- -- 3.3E+01 6.0E+01 -- -- 8.8E+01 1.6E+02 -- -- 3.3E+00 6.0E+00 -- -- 8.8E+00 1.6E+01 -- -- 8.8E+00 1.6E+01 C N-Nitrosodi-n-propylamine 0 -- -- 5.0E-02 5.1E+00 -- -- 1.3E-01 1.4E+01 -- -- 5.0E-03 5.1E-01 -- -- 1.3E-02 1.4E+00 -- -- 1.3E-02 1.4E+00 Nonylphenol 0 2.8E+01 6.6E+00 -- -- 4.5E+01 1.1E+01 -- -- 7.0E+00 1.7E+00 -- -- 1.1E+01 2.7E+00 -- -- 1.1E+01 2.7E+00 -- -- Parathion 0 6.5E-02 1.3E-02 -- -- 1.1E-01 2.2E-02 -- -- 1.6E-02 3.3E-03 -- -- 2.6E-02 5.4E-03 -- -- 2.6E-02 5.4E-03 -- -- C PCB Total 0 -- 1.4E-02 6.4E-04 6.4E-04 -- 2.3E-02 1.7E-03 1.7E-03 -- 3.5E-03 6.4E-05 6.4E-05 -- 5.8E-03 1.7E-04 1.7E-04 -- 5.8E-03 1.7E-04 1.7E-04 C Pentachlorophenol 0 7.3E+00 5.6E+00 2.7E+00 3.0E+01 1.2E+01 9.3E+00 7.2E+00 8.0E+01 1.8E+00 1.4E+00 2.7E-01 3.0E+00 2.9E+00 2.3E+00 7.2E-01 8.0E+00 2.9E+00 2.3E+00 7.2E-01 8.0E+00 Phenol 0 -- -- 1.0E+04 8.6E+05 -- -- 1.9E+04 1.7E+06 -- -- 1.0E+03 8.6E+04 -- -- 1.9E+03 1.7E+05 -- -- 1.9E+03 1.7E+05 Pyrene 0 -- -- 8.3E+02 4.0E+03 -- -- 1.6E+03 7.7E+03 -- -- 8.3E+01 4.0E+02 -- -- 1.6E+02 7.7E+02 -- -- 1.6E+02 7.7E+02 Radionuclides 0 ------Gross Alpha Activity (pCi/L) 0 -- -- 1.5E+01 ------2.9E+01 ------1.5E+00 ------2.9E+00 ------2.9E+00 -- Beta and Photon Activity (mrem/yr) 0 -- -- 4.0E+00 4.0E+00 -- -- 7.7E+00 7.7E+00 -- -- 4.0E-01 4.0E-01 -- -- 7.7E-01 7.7E-01 -- -- 7.7E-01 7.7E-01 Radium 226 + 228 (pCi/L) 0 -- -- 5.0E+00 ------9.6E+00 ------5.0E-01 ------9.6E-01 ------9.6E-01 -- Uranium (ug/l) 0 -- -- 3.0E+01 ------5.8E+01 ------3.0E+00 ------5.8E+00 ------5.8E+00 -- page 3 of 4 MSTRANTI 2a - Freshwater WLAs 8/18/2011 Parameter Background Water Quality Criteria Wasteload Allocations Antidegradation Baseline Antidegradation Allocations Most Limiting Allocations (ug/l unless noted) Conc. Acute Chronic HH (PWS) HH Acute Chronic HH (PWS) HH Acute Chronic HH (PWS) HH Acute Chronic HH (PWS) HH Acute Chronic HH (PWS) HH Selenium, Total Recoverable 0 2.0E+01 5.0E+00 1.7E+02 4.2E+03 3.2E+01 8.3E+00 3.3E+02 8.1E+03 5.0E+00 1.3E+00 1.7E+01 4.2E+02 8.1E+00 2.1E+00 3.3E+01 8.1E+02 8.1E+00 2.1E+00 3.3E+01 8.1E+02 Silver 0 3.7E-01 ------6.0E-01 ------9.3E-02 ------1.5E-01 ------1.5E-01 ------Sulfate 0 -- -- 2.5E+05 ------4.8E+05 ------2.5E+04 ------4.8E+04 ------4.8E+04 -- C 1,1,2,2-Tetrachloroethane 0 -- -- 1.7E+00 4.0E+01 -- -- 4.5E+00 1.1E+02 -- -- 1.7E-01 4.0E+00 -- -- 4.5E-01 1.1E+01 -- -- 4.5E-01 1.1E+01 C Tetrachloroethylene 0 -- -- 6.9E+00 3.3E+01 -- -- 1.8E+01 8.8E+01 -- -- 6.9E-01 3.3E+00 -- -- 1.8E+00 8.8E+00 -- -- 1.8E+00 8.8E+00 Thallium 0 -- -- 2.4E-01 4.7E-01 -- -- 4.6E-01 9.0E-01 -- -- 2.4E-02 4.7E-02 -- -- 4.6E-02 9.0E-02 -- -- 4.6E-02 9.0E-02 Toluene 0 -- -- 5.1E+02 6.0E+03 -- -- 9.8E+02 1.2E+04 -- -- 5.1E+01 6.0E+02 -- -- 9.8E+01 1.2E+03 -- -- 9.8E+01 1.2E+03 Total dissolved solids 0 -- -- 5.0E+05 ------9.6E+05 ------5.0E+04 ------9.6E+04 ------9.6E+04 -- C Toxaphene 0 7.3E-01 2.0E-04 2.8E-03 2.8E-03 1.2E+00 3.3E-04 7.4E-03 7.4E-03 1.8E-01 5.0E-05 2.8E-04 2.8E-04 2.9E-01 8.3E-05 7.4E-04 7.4E-04 2.9E-01 8.3E-05 7.4E-04 7.4E-04 Tributyltin 0 4.6E-01 7.2E-02 -- -- 7.4E-01 1.2E-01 -- -- 1.2E-01 1.8E-02 -- -- 1.9E-01 3.0E-02 -- -- 1.9E-01 3.0E-02 -- -- 1,2,4-Trichlorobenzene 0 -- -- 3.5E+01 7.0E+01 -- -- 6.7E+01 1.3E+02 -- -- 3.5E+00 7.0E+00 -- -- 6.7E+00 1.3E+01 -- -- 6.7E+00 1.3E+01 C 1,1,2-Trichloroethane 0 -- -- 5.9E+00 1.6E+02 -- -- 1.6E+01 4.2E+02 -- -- 5.9E-01 1.6E+01 -- -- 1.6E+00 4.2E+01 -- -- 1.6E+00 4.2E+01 C Trichloroethylene 0 -- -- 2.5E+01 3.0E+02 -- -- 6.6E+01 8.0E+02 -- -- 2.5E+00 3.0E+01 -- -- 6.6E+00 8.0E+01 -- -- 6.6E+00 8.0E+01 C 2,4,6-Trichlorophenol 0 -- -- 1.4E+01 2.4E+01 -- -- 3.7E+01 6.4E+01 -- -- 1.4E+00 2.4E+00 -- -- 3.7E+00 6.4E+00 -- -- 3.7E+00 6.4E+00 2-(2,4,5-Trichlorophenoxy) propionic acid (Silvex) 0 -- -- 5.0E+01 ------9.6E+01 ------5.0E+00 ------9.6E+00 ------9.6E+00 -- C Vinyl Chloride 0 -- -- 2.5E-01 2.4E+01 -- -- 6.6E-01 6.4E+01 -- -- 2.5E-02 2.4E+00 -- -- 6.6E-02 6.4E+00 -- -- 6.6E-02 6.4E+00 Zinc 0 3.9E+01 3.9E+01 7.4E+03 2.6E+04 6.3E+01 6.5E+01 1.4E+04 5.0E+04 9.8E+00 9.8E+00 7.4E+02 2.6E+03 1.6E+01 1.6E+01 1.4E+03 5.0E+03 1.6E+01 1.6E+01 1.4E+03 5.0E+03 Notes: Metal Target Value (SSTV) Note: do not use QL's lower than the 1. All concentrations expressed as micrograms/liter (ug/l), unless noted otherwise Antimony 1.1E+00 minimum QL's provided in agency 2. Discharge flow is highest monthly average or Form 2C maximum for Industries and design flow for Municipals Arsenic 1.9E+00 guidance 3. Metals measured as Dissolved, unless specified otherwise Barium 3.8E+02 4. "C" indicates a carcinogenic parameter Cadmium 1.0E-01 5. Regular WLAs are mass balances (minus background concentration) using the % of stream flow entered above under Mixing Information. Chromium III 6.3E+00 Antidegradation WLAs are based upon a complete mix. Chromium VI 2.6E+00 6. Antideg. Baseline = (0.25(WQC - background conc.) + background conc.) for acute and chronic Copper 6.4E-01 = (0.1(WQC - background conc.) + background conc.) for human health Iron 5.8E+01 7. WLAs established at the following stream flows: 1Q10 for Acute, 30Q10 for Chronic Ammonia, 7Q10 for Other Chronic, 30Q5 for Non-carcinogens and Lead 6.4E-01 Harmonic Mean for Carcinogens. To apply mixing ratios from a model set the stream flow equal to (mixing ratio - 1), effluent flow equal to 1 and 100% mix. Manganese 9.6E+00 Mercury 1.9E-01 Nickel 1.7E+00 Selenium 1.2E+00 Silver 6.0E-02 Zinc 6.3E+00 page 4 of 4 MSTRANTI 2a - Freshwater WLAs 8/18/2011 Facility: Groundhog Mountain Resort STP, VA0066575 Chemical = Ammonia Chronic averaging period = 30 WLAa = 21.9 WLAc = 3.54 Q.L. = 0.2 # samples/mo. = 1 # samples/wk. = 1 Summary of Statistics: # observations = 1 Expected Value = 9 Variance = 29.16 C.V. = 0.6 97th percentile daily values = 21.9007 97th percentile 4 day average = 14.9741 97th percentile 30 day average= 10.8544 # < Q.L. = 0 Model used = BPJ Assumptions, type 2 data A limit is needed based on Chronic Toxicity Maximum Daily Limit = 7.14255213069374 Average Weekly limit = 7. 14255213069374 Average Monthly Limit = 7. 14255213069374 The data are: 9 Chemical = Total Residual Chlorine Chronic averaging period = 4 WLAa = 31 WLAc = 18 Q.L. = 0.1 # samples/mo. = 30 # samples/wk. = 8 Summary of Statistics: # observations = 1 Expected Value = 20 Variance = 144 C.V. = 0.6 97th percentile daily values = 48.6683 97th percentile 4 day average = 33.2758 97th percentile 30 day average= 24.1210 # < Q.L. = 0 Model used = BPJ Assumptions, type 2 data A limit is needed based on Chronic Toxicity Maximum Daily Limit = 26.3263461129582 Average Weekly limit = 15.7037993496017 Average Monthly Limit = 13.0478943008877 The data are: 20 SATS.exe output files for toxic limit evaluation Chemical = Copper(single point before clean metals sampling & analysis) Chronic averaging period = 4 WLAa = 6.4 WLAc = 4.9 Q.L. = 2.6 # samples/mo. = 1 # samples/wk. = 1 Summary of Statistics: # observations = 1 Expected Value = 20 Variance = 144 C.V. = 0.6 97th percentile daily values = 48.6683 97th percentile 4 day average = 33.2758 97th percentile 30 day average= 24.1210 # < Q.L. = 0 Model used = BPJ Assumptions, type 2 data A limit is needed based on Acute Toxicity Maximum Daily Limit = 6.4 Average Weekly limit = 6.4 Average Monthly Limit = 6.4 The data are: 20 Chemical = Zinc (single point before clean metals sampling & analysis) Chronic averaging period = 4 WLAa = 63 WLAc = 65 Q.L. = 25 # samples/mo. = 1 # samples/wk. = 1 Summary of Statistics: # observations = 1 Expected Value = 40 Variance = 576 C.V. = 0.6 97th percentile daily values = 97.3367 97th percentile 4 day average = 66.5516 97th percentile 30 day average= 48.2421 # < Q.L. = 0 Model used = BPJ Assumptions, type 2 data A limit is needed based on Acute Toxicity Maximum Daily Limit = 63 Average Weekly limit = 63 Average Monthly Limit = 63 The data are: 40 SATS.exe output files for toxic limit evaluation Chemical = Copper (clean metals sampling & analysis data) Chronic averaging period = 4 WLAa = 6.4 WLAc = 4.9 Q.L. = 2.6 # samples/mo. = 1 # samples/wk. = 1 Summary of Statistics: # observations = 12 Expected Value = 119.363 Variance = 44954.2 C.V. = 1.776284 97th percentile daily values = 552.749 97th percentile 4 day average = 374.591 97th percentile 30 day average= 192.177 # < Q.L. = 0 Model used = lognormal A limit is needed based on Acute Toxicity Maximum Daily Limit = 6.4 Average Weekly Limit = 6.4 Average Monthly Limit = 6.4 The data are: 10 73.7 25.7 77 171 177 100 152 85 634 26 18 Chemical = Zinc (clean metals sampling & analysis data) Chronic averaging period = 4 WLAa = 63 WLAc = 65 Q.L. = 25 # samples/mo. = 1 # samples/wk. = 1 Summary of Statistics: # observations = 12 Expected Value = 42.3783 Variance = 646.532 C.V. = 0.6 97th percentile daily values = 103.124 97th percentile 4 day average = 70.5086 97th percentile 30 day average= 51.1105 # < Q.L. = 3 Model used = BPJ Assumption, Type 1 data A limit is needed based on Acute Toxicity Maximum Daily Limit = 63 Average Weekly Limit = 63 Average Monthly Limit = 63 The data are: 65 1 22.1 233 351 285 208 236 224 214 160 10.5 SATS.exe output files for toxic limit evaluation