9VAC25-720 Water Quality Management Planning Regulation

REGULATIONS

Vol. 27 Iss. 11 - January 31, 2011

TITLE 9. ENVIRONMENT

STATE WATER CONTROL BOARD

Chapter 720

Final Regulation

REGISTRAR'S NOTICE: The following regulatory action is exempt from the Administrative Process Act in accordance with § 2.2-4006 A 4 b of the Code of Virginia, which excludes regulations that are required by order of any state or federal court of competent jurisdiction where no agency discretion is involved. The State Water Control Board will receive, consider, and respond to petitions by any interested person at any time with respect to reconsideration or revision.

Title of Regulation: 9VAC25-720. Water Quality Management Planning Regulation (amending 9VAC25-720-50).

Statutory Authority: § 62.1-44.15 of the Code of Virginia; 33 USC § 1313(e) of the federal Clean Water Act.

Effective Date: March 2, 2011.

Agency Contact: Alan Pollock, Department of Environmental Quality, 629 East Main Street, P.O. Box 1105, Richmond, VA 23218, telephone [phone], FAX [phone], or email [e-mail].

Background:

The Waste Load Allocation for the Frederick-Winchester Service Authority: Opequon Wastewater Treatment Facility (Opequon WRF - VA0065552) found in 9VAC25-720-50 C is being amended based on the advice of legal counsel as settlement of Case No. CL090004007-00, Frederick-Winchester Service Authority (FWSA) v. State Water Control Board and Department of Environmental Quality (DEQ). Settlement of the case establishes allocations for the Opequon Wastewater Treatment Facility based on 3.0 mg/l nitrogen and 0.30 mg/l phosphorus at a design flow of 12.6 MGD, which would result in an allocation of 115,122 lbs/year nitrogen, with an additional 6,792 lbs/year nitrogen for the landfill leachate consolidation, for a total of 121,851 lbs/year nitrogen, and a total of 11,512 lbs/year phosphorus.

In 2005, the State Water Control Board adopted amendments to the Water Quality Management Planning Regulations, 9VAC25-720, to establish waste load allocations (WLA) for discharges of total nitrogen (TN) and total phosphorus (TP) by some 125 significant discharges including the Opequon Water Reclamation Facility (Opequon WRF) based on the design capacity of each plant. In the 2005 rulemaking, the Frederick-Winchester Service Authority (FWSA), which operates the Opequon WRF, requested TN and TP WLAs for the Opequon WRF based on a design flow of 12.6 million gallons per day (MGD) and the board adopted final WLAs based on a design flow of 8.4 MGD.

Following the submittal of a rulemaking petition by FWSA in 2006, the board initiated and conducted a rulemaking from 2007 through 2009 to consider revising the TN and TP WLAs under the regulation for the Opequon WRF. This rulemaking culminated in a board public meeting begun on December 4, 2008, and completed on April 27, 2009, at which the board denied FWSA's request. Following this board action, the FWSA filed a Notice of Appeal with the board and DEQ in May 2009 and a Petition for Appeal with the Circuit Court of the City of Winchester in June 2009 seeking increased WLAs for the Opequon WRF based on the 12.6 MGD design flow, amounting to an increase of 51,091 pounds per year (lbs/yr) of TN and 3,831 lbs/yr of TP.

Following the filing of Motions of Summary Judgment and supporting briefs by both FWSA and the board before the court, the court encouraged the parties to consider settlement, because it presented complex regulatory issues and the court believed that it would be in the parties' respective best interests and the public interest for the parties to attempt to resolve the case by negotiation. The FWSA and the board, with the board acting on the advice of DEQ and legal counsel, reached a compromise that requires stringent treatment by the Opequon WRF while also allowing FWSA the full use of the facility's recently completed expansion to 12.6 MGD design flow.

The board, at its meeting on September 27-28, 2010, based on the advice of legal counsel, approved a settlement of the case that would establish allocations for the Opequon WRF based on 3.0 mg/l nitrogen and 0.30 mg/l phosphorus at a design flow of 12.6 MGD. The board also authorized DEQ to public notice the approved settlement and to receive comments. DEQ received comments from the Chesapeake Bay Foundation (CBF) related to the approved settlement. Copies of the comments made by CBF have been distributed previously to the board, the FWSA, and the court.

Upon consideration of the pleadings, the arguments of counsel, the comments of the Chesapeake Bay Foundation, and the purposes of the State Water Control Law, the court found that the proposed settlement, approved by the board, is fair, adequate, and reasonable and that it is not illegal, a product of collusion, or against the public interest. The court also found that the proposed decree is a reasoned compromise that considered the legitimate interests of FWSA and the public it serves, and implements the duty of the board to protect the quality of state waters.

In a Consent Decree dated October 19, 2010, the court decreed that:

"Notwithstanding the 2005 and 2009 Rulemakings and the typical concentration basis for 4 milligrams per liter (mg/l) for TN WLAs in the Opequon WRF's river basin, the TN and TP WLAs allocations for the Opequon WRF shall be increased to credit the WRF for its current 12.6 MGD design capacity while applying more stringent, state-of-the-art treatment, as follows:

a. The TN WLA based on the Opequon WRF's design capacity shall be increased from 102,311 lbs/yr to 115,122 lbs/yr (derived based on 3 mg/l of TN and 12.6 MGD).

b. The TP WLA based on the Opequon WRF's design capacity shall be increased from 7,675 lbs/yr to 11,512 lbs/yr (derived based on 0.3 mg/l of TP and 12.6 MGD).

c. Such increases result in the stated final WLAs for the Opequon WRF, which shall be in addition to any allocations or increases acquired or which may be acquired by the Opequon WRF in accordance with applicable laws and regulations pertaining to nutrient credit exchanges or offsets. As of the date of this decree, the Opequon WFR has acquired additional allocation for TN in the amount of 6,729 lbs/yr by means of a landfill leachate consolidation and treatment project. Thus upon entry of this decree, the Opequon WRF's TN WLA shall be 121,851 lbs/yr.

d. The Board shall forthwith amend the Regulation pursuant to CODE 2.2-4006.A.4.b to conform to the WLAs required by subparagraphs a through c of this decree."

Summary:

The amendments to 9VAC25-720-50 C revise the waste load allocation for the Opequon WRF to 121,851 lbs/year nitrogen (115,122 lbs/year plus the already allocated 6,729 lbs/year for the landfill leachate consolidation) and 11,512 lbs/year phosphorus.

9VAC25-720-50. Potomac-Shenandoah River Basin.

A. Total Maximum Daily Load (TMDLs).

TMDL #	Stream Name	TMDL Title	City/County	WBID	Pollutant	WLA	Units
1.	Muddy Creek	Nitrate TMDL Development for Muddy Creek/Dry River, Virginia	Rockingham	B21R	Nitrate	49,389.00	LB/YR
2.	Blacks Run	TMDL Development for Blacks Run and Cooks Creek	Rockingham	B25R	Sediment	32,844.00	LB/YR
3.	Cooks Creek	TMDL Development for Blacks Run and Cooks Creek	Rockingham	B25R	Sediment	69,301.00	LB/YR
4.	Cooks Creek	TMDL Development for Blacks Run and Cooks Creek	Rockingham	B25R	Phosphorus	0	LB/YR
5.	Muddy Creek	TMDL Development for Muddy Creek and Holmans Creek, Virginia	Rockingham	B22R	Sediment	286,939.00	LB/YR
6.	Muddy Creek	TMDL Development for Muddy Creek and Holmans Creek, Virginia	Rockingham	B22R	Phosphorus	38.00	LB/YR
7.	Holmans Creek	TMDL Development for Muddy Creek and Holmans Creek, Virginia	Rockingham/ Shenandoah	B45R	Sediment	78,141.00	LB/YR
8.	Mill Creek	TMDL Development for Mill Creek and Pleasant Run	Rockingham	B29R	Sediment	276.00	LB/YR
9.	Mill Creek	TMDL Development for Mill Creek and Pleasant Run	Rockingham	B29R	Phosphorus	138.00	LB/YR
10.	Pleasant Run	TMDL Development for Mill Creek and Pleasant Run	Rockingham	B27R	Sediment	0.00	LB/YR
11.	Pleasant Run	TMDL Development for Mill Creek and Pleasant Run	Rockingham	B27R	Phosphorus	0.00	LB/YR
12.	Linville Creek	Total Maximum Load Development for Linville Creek: Bacteria and Benthic Impairments	Rockingham	B46R	Sediment	5.50	TONS/YR
13.	Quail Run	Benthic TMDL for Quail Run	Rockingham	B35R	Ammonia	7,185.00	KG/YR
14.	Quail Run	Benthic TMDL for Quail Run	Rockingham	B35R	Chlorine	27.63	KG/YR
15.	Shenandoah River	Development of Shenandoah River PCB TMDL (South Fork and Main Stem)	Warren & Clarke	B41R B55R B57R B58R	PCBs	179.38	G/YR
16.	Shenandoah River	Development of Shenandoah River PCB TMDL (North Fork)	Warren & Clarke	B51R	PCBs	0.00	G/YR
17.	Shenandoah River	Development of Shenandoah River PCB TMDL (Main Stem)	Warren & Clarke	WV	PCBs	179.38	G/YR
18.	Cockran Spring	Benthic TMDL Reports for Six Impaired Stream Segments in the Potomac-Shenandoah and James River Basins	Augusta	B10R	Organic Solids	1,556.00	LB/YR
19.	Lacey Spring	Benthic TMDL Reports for Six Impaired Stream Segments in the Potomac-Shenandoah and James River Basins	Rockingham	B47R	Organic Solids	680.00	LB/YR
20.	Orndorff Spring	Benthic TMDL Reports for Six Impaired Stream Segments in the Potomac-Shenandoah and James River Basins	Shenandoah	B52R	Organic Solids	103.00	LB/YR
21.	Toms Brook	Benthic TMDL for Toms Brook in Shenandoah County, Virginia	Shenandoah	B50R	Sediment	8.1	T/YR
22.	Goose Creek	Benthic TMDLs for the Goose Creek Watershed	Loudoun, Fauquier	A08R	Sediment	1,587	T/YR
23.	Little River	Benthic TMDLs for the Goose Creek Watershed	Loudoun	A08R	Sediment	105	T/YR
24.	Christians Creek	Fecal Bacteria and General Standard Total Maximum Daily Load Development for Impaired Streams in the Middle River and Upper South River Watersheds, Augusta County, VA	Augusta	B14R	Sediment	145	T/YR
25.	Moffett Creek	Fecal Bacteria and General Standard Total Maximum Daily Load Development for Impaired Streams in the Middle River and Upper South River Watersheds, Augusta County, VA	Augusta	B13R	Sediment	0	T/YR
26.	Upper Middle River	Fecal Bacteria and General Standard Total Maximum Daily Load Development for Impaired Streams in the Middle River and Upper South River Watersheds, Augusta County, VA	Augusta	B10R	Sediment	1.355	T/YR
27.	Mossy Creek	Total Maximum Daily Load Development for Mossy Creek and Long Glade Run: Bacteria and General Standard (Benthic) Impairments	Rockingham	B19R	Sediment	0.04	T/YR
28.	Smith Creek	Total Maximum Daily Load (TMDL) Development for Smith Creek	Rockingham, Shenandoah	B47R	Sediment	353,867	LB/YR
29.	Abrams Creek	Opequon Watershed TMDLs for Benthic Impairments: Abrams Creek and Lower Opequon Creek, Frederick and Clarke counties, Virginia	Frederick	B09R	Sediment	478	T/YR
30.	Lower Opequon Creek	Opequon Watershed TMDLs for Benthic Impairments: Abrams Creek and Lower Opequon Creek, Frederick and Clarke counties, Virginia	Frederick, Clarke	B09R	Sediment	1,039	T/YR
31.	Mill Creek	Mill Creek Sediment TMDL for a Benthic Impairment, Shenandoah County, Virginia	Shenandoah	B48R	Sediment	0.9	T/YR
32.	South Run	Benthic TMDL Development for South Run, Virginia	Fauquier	A19R	Phosphorus	0.038	T/YR
33.	Lewis Creek	Total Maximum Daily Load Development for Lewis Creek, General Standard (Benthic)	Augusta	B12R	Sediment	40	T/YR
34.	Lewis Creek	Total Maximum Daily Load Development for Lewis Creek, General Standard (Benthic)	Augusta	B12R	Lead	0	KG/YR
35.	Lewis Creek	Total Maximum Daily Load Development for Lewis Creek, General Standard (Benthic)	Augusta	B12R	PAHs	0	KG/YR
36.	Bull Run	Total Maximum Daily Load Development for Lewis Creek, General Standard (Benthic)	Loudoun, Fairfax, and Prince William counties, and the Cities of Manassas and Manassas Park	A23R-01	Sediment	5,986.8	T/TR
37.	Popes Head Creek	Total Maximum Daily Load Development for Lewis Creek, General Standard (Benthic)	Fairfax County and Fairfax City	A23R-02	Sediment	1,594.2	T/YR
38.	Accotink Bay	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Fairfax	A15R	PCBs	0.0992	G/YR
39.	Aquia Creek	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Stafford	A28E	PCBs	6.34	G/YR
40.	Belmont Bay/ Occoquan Bay	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Prince William	A25E	PCBs	0.409	G/YR
41.	Chopawamsic Creek	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Prince William	A26E	PCBs	1.35	G/YR
42.	Coan River	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Northumberland	A34E	PCBs	0	G/YR
43.	Dogue Creek	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Fairfax	A14E	PCBs	20.2	G/YR
44.	Fourmile Run	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Arlington	A12E	PCBs	11	G/YR
45.	Gunston Cove	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Fairfax	A15E	PCBs	0.517	G/YR
46.	Hooff Run & Hunting Creek	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Fairfax	A13E	PCBs	36.8	G/YR
47.	Little Hunting Creek	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Fairfax	A14E	PCBs	10.1	G/YR
48.	Monroe Creek	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Fairfax	A31E	PCBs	.0177	G/YR
49.	Neabsco Creek	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Prince William	A25E	PCBs	6.63	G/YR
50.	Occoquan River	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Prince William	A25E	PCBs	2.86	G/YR
51.	Pohick Creek/Pohick Bay	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Fairfax	A16E	PCBs	13.5	G/YR
52.	Potomac Creek	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Stafford	A29E	PCBs	0.556	G/YR
53.	Potomac River, Fairview Beach	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	King George	A29E	PCBs	0.0183	G/YR
54.	Powells Creek	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Prince William	A26R	PCBs	0.0675	G/YR
55.	Quantico Creek	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	Prince William	A26R	PCBs	0.742	G/YR
56.	Upper Machodoc Creek	PCB Total Maximum Daily Load Development in the tidal Potomac and Anacostia Rivers and their tidal tributaries	King George	A30E	PCBs	0.0883	G/YR
57.	Difficult Creek	Benthic TMDL Development for Difficult Run, Virginia	Fairfax	A11R	Sediment	3,663.2	T/YR
58.	Abrams Creek	Opequon Watershed TMDLs for Benthic Impairments	Frederick and Clark	B09R	Sediment	1039	T/YR
59.	Lower Opequon	Opequon Watershed TMDLs for Benthic Impairments	Frederick and Clark	B09R	Sediment	1039	T/YR

B. Non-TMDL waste load allocations.

Water Body	Permit No.	Facility Name	Outfall No.	Receiving Stream	River Mile	Parameter Description	WLA	Units WLA
VAV-B02R	VA0023281	Monterey STP	001	West Strait Creek	3.85	CBOD5	11.4	KG/D
VAV-B08R	VA0065552	Opequon Water Reclamation Facility	001	Opequon Creek	32.66	BOD5, JUN-NOV	207	KG/D
		AKA Winchester - Frederick Regional				CBOD5, DEC-MAY	1514	KG/D
VAV-B14R	VA0025291	Fishersville Regional STP	001	Christians Creek	12.36	BOD5	182	KG/D
VAV-B23R	VA0060640	North River WWTF	001	North River	15.01	CBOD5, JAN-MAY	700	KG/D
	7.23.04	AKA Harrisonburg - Rockingham Reg. Sewer Auth.				CBOD5, JUN-DEC	800	KG/D
						TKN, JUN-DEC	420	KG/D
						TKN, JAN-MAY	850	KG/D
VAV-B32R	VA0002160	INVISTA - Waynesboro Formerly Dupont - Waynesboro	001	South River	25.3	BOD5	272	KG/D
VAV-B32R	VA0025151	Waynesboro STP	001	South River	23.54	CBOD5	227	KG/D
						CBOD5, JUN-OCT	113.6	KG/D
VAV-B32R	VA0028037	Skyline Swannanoa STP	001	South River UT	2.96	BOD5	8.5	KG/D
VAV-B35R	VA0024732	Massanutten Public Service STP	001	Quail Run	5.07	BOD5	75.7	KG/D
VAV-B37R	VA0002178	Merck & Company	001	S.F. Shenandoah River	88.09	BOD5	1570	KG/D
						AMMONIA, AS N	645.9	KG/D
VAV-B49R	VA0028380	Stoney Creek Sanitary District STP	001	Stoney Creek	19.87	BOD5, JUN-NOV	29.5	KG/D
VAV-B53R	VA0020982	Middletown STP	001	Meadow Brook	2.19	CBOD5	24.0	KG/D
VAV-B58R	VA0020532	Berryville STP	001	Shenandoah River	24.23	CBOD5	42.6	KG/D

C. Nitrogen and phosphorus waste load allocations to restore the Chesapeake Bay and its tidal rivers. The following table presents nitrogen and phosphorus waste load allocations for the identified significant dischargers and the total nitrogen and total phosphorus waste load allocations for the listed facilities.

Virginia Waterbody ID	Discharger Name	VPDES Permit No.	Total Nitrogen (TN) Waste Load Allocation (lbs/yr)	Total Phosphorus (TP) Waste Load Allocation (lbs/yr)
B37R	Coors Brewing Company	VA0073245	54,820	4,112
B14R	Fishersville Regional STP	VA0025291	48,729	3,655
B32R	INVISTA - Waynesboro (Outfall 101)	VA0002160	78,941	1,009
B39R	Luray STP	VA0062642	19,492	1,462
B35R	Massanutten PSA STP	VA0024732	18,273	1,371
B37R	Merck - Stonewall WWTP (Outfall 101) (10)	VA0002178	14,619	1,096
B12R	Middle River Regional STP	VA0064793	82,839	6,213
B23R	North River WWTF (2)	VA0060640	253,391	19,004
B22R	VA Poultry Growers -Hinton	VA0002313	27,410	1,371
B38R	Pilgrims Pride - Alma	VA0001961	18,273	914
B31R	Stuarts Draft WWTP	VA0066877	48,729	3,655
B32R	Waynesboro STP	VA0025151	48,729	3,655
B23R	Weyers Cave STP	VA0022349	6,091	457
B58R	Berryville STP	VA0020532	8,528	640
B55R	Front Royal STP	VA0062812	48,729	3,655
B49R	Georges Chicken LLC	VA0077402	31,065	1,553
B48R	Mt. Jackson STP (3)	VA0026441	8,528	640
B45R	New Market STP	VA0022853	6,091	457
B45R	North Fork (SIL) WWTF	VA0090263	23,390	1,754
B49R	Stoney Creek SD STP	VA0028380	7,309	548
B50R	North Fork Regional WWTP (1)	VA0090328	9,137	685
B51R	Strasburg STP	VA0020311	11,939	895
B50R	Woodstock STP	VA0026468	24,364	1,827
A06R	Basham Simms WWTF (4)	VA0022802	18,273	1,371
A09R	Broad Run WRF (5)	VA0091383	134,005	3,350
A08R	Leesburg WPCF	MD0066184	121,822	9,137
A06R	Round Hill Town WWTF	VA0026212	9,137	685
A25R	DSC - Section 1 WWTF (6)	VA0024724	42,029	2,522
A25R	DSC - Section 8 WWTF (7)	VA0024678	42,029	2,522
A25E	H L Mooney WWTF	VA0025101	219,280	13,157
A22R	UOSA - Centreville	VA0024988	1,315,682	16,446
A19R	Vint Hill WWTF (8)	VA0020460	8,680	868
B08R	Opequon WRF (11)	VA0065552	102,336 121,851	7,675 11,512
B08R	Parkins Mills STP (9)	VA0075191	60,911	4,568
A13E	Alexandria SA WWTF	VA0025160	493,381	29,603
A12E	Arlington County Water PCF	VA0025143	365,467	21,928
A16R	Noman M Cole Jr PCF	VA0025364	612,158	36,729
A12R	Blue Plains (VA Share)	DC0021199	581,458	26,166
A26R	Quantico WWTF	VA0028363	20,101	1,206
A28R	Aquia WWTF	VA0060968	73,093	4,386
A31E	Colonial Beach STP	VA0026409	18,273	1,827
A30E	Dahlgren WWTF	VA0026514	9,137	914
A29E	Fairview Beach	MD0056464	1,827	183
A30E	US NSWC-Dahlgren WWTF	VA0021067	6,578	658
A31R	Purkins Corner STP	VA0070106	1,096	110
	TOTALS:		5,156,169	246,635

NOTE: (1) Shenandoah Co. - North Fork Regional WWTP waste load allocations (WLAs) based on a design flow capacity of 0.75 million gallons per day (MGD). If plant is not certified to operate at 0.75 MGD design flow capacity by December 31, 2010, the WLAs will be deleted and facility removed from Significant Discharger List.

(2) Harrisonburg-Rockingham Regional S.A.-North River STP: waste load allocations (WLAs) based on a design flow capacity of 20.8 million gallons per day (MGD). If plant is not certified to operate at 20.8 MGD design flow capacity by December 31, 2011, the WLAs will decrease to TN = 194,916 lbs/yr; TP = 14,619 lbs/yr, based on a design flow capacity of 16.0 MGD.

(3) Mount Jackson STP: waste load allocations (WLAs) based on a design flow capacity of 0.7 million gallons per day (MGD). If plant is not certified to operate at 0.7 MGD design flow capacity by December 31, 2010, the WLAs will decrease to TN = 7,309 lbs/yr; TP = 548 lbs/yr, based on a design flow capacity of 0.6 MGD.

(4) Purcellville-Basham Simms STP: waste load allocations (WLAs) based on a design flow capacity of 1.5 million gallons per day (MGD). If plant is not certified to operate at 1.5 MGD design flow capacity by December 31, 2010, the WLAs will decrease to TN = 12,182 lbs/yr; TP = 914lbs/yr, based on a design flow capacity of 1.0 MGD.

(5) Loudoun Co. S.A.-Broad Run WRF: waste load allocations (WLAs) based on a design flow capacity of 11.0 million gallons per day (MGD). If plant is not certified to operate at 11.0 MGD design flow capacity by December 31, 2010, the WLAs will decrease to TN = 121,822 lbs/yr; TP = 3,046 lbs/yr, based on a design flow capacity of 10.0 MGD.

(6) Dale Service Corp.-Section 1 WWTF: waste load allocations (WLAs) based on a design flow capacity of 4.6 million gallons per day (MGD). If plant is not certified to operate at 4.6 MGD design flow capacity by December 31, 2010, the WLAs will decrease to TN = 36,547 lbs/yr; TP = 2,193 lbs/yr, based on a design flow capacity of 4.0 MGD.

(7) Dale Service Corp.-Section 8 WWTF: waste load allocations (WLAs) based on a design flow capacity of 4.6 million gallons per day (MGD). If plant is not certified to operate at 4.6 MGD design flow capacity by December 31, 2010, the WLAs will decrease to TN = 36,547 lbs/yr; TP = 2,193 lbs/yr, based on a design flow capacity of 4.0 MGD.

(8) Fauquier Co. W&SA-Vint Hill STP: waste load allocations (WLAs) based on a design flow capacity of 0.95 million gallons per day (MGD). If plant is not certified to operate at 0.95 MGD design flow capacity by December 31, 2011, the WLAs will decrease to TN = 5,482 lbs/yr; TP = 548 lbs/yr, based on a design flow capacity of 0.6 MGD.

(9) Parkins Mill STP: waste load allocations (WLAs) based on a design flow capacity of 5.0 million gallons per day (MGD). If plant is not certified to operate at 5.0 MGD design flow capacity by December 31, 2010, the WLAs will decrease to TN = 36,547 lbs/yr; TP = 2,741 lbs/yr, based on a design flow capacity of 3.0 MGD.

(10) Merck-Stonewall – (a) on January 1, 2011, the following waste load allocations (WLAs) are effective and supersede the existing WLAs: total nitrogen of 43,835 lbs/yr and total phosphorus of 4,384 lbs/yr; (b) waste load allocations will be reviewed and possibly reduced based on "full-scale" results showing the optimal treatment capability of the 4-stage Bardenpho technology at this facility consistent with the level of effort by other dischargers in the region. The "full scale" evaluation will be completed by December 31, 2011, and the results submitted to DEQ for review and subsequent board action; (c) in any year when credits are available after all other exchanges within the Shenandoah-Potomac River Basin are completed in accordance with § 62.1-44.19:18 of the Code of Virginia, Merck shall acquire credits for total nitrogen discharged in excess of 14,619 lbs/yr and total phosphorus discharged in excess of 1,096 lbs/yr; and (d) the allocations are not transferable and compliance credits are only generated if discharged loads are less than the loads identified in clause (c).

(11) Opequon WRF: (a) the TN WLA is derived based on 3 mg/l of TN and 12.6 MGD; (b) the TN WLA includes an additional allocation for TN in the amount of 6,729 lbs/yr by means of a landfill leachate consolidation and treatment project; and (c) the TP WLA is derived based on 0.3 mg/l of TP and 12.6 MGD.

VA.R. Doc. No. R11-2660; Filed January 10, 2011, 3:08 p.m.