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Home My WebLink AboutNCG551768_Fact Sheet_20201209DocuSign Envelope ID: EF6FF180-D2D7-4BF7-80A3-6E1799957609 DEQ / DWR / NPDES EAA Review Emily DelDuco Compliance & Expedited Permitting Unit October 2020 NPDES Permit NCG551768 3007 Redwood Road, Durham, NC Durham County - RRO Facility Summary: This permit is for the replacement (not expanding) of an existing aging sand filter discharge system. The applicant did not attach a statement from the Health Department to deem the system as failed, but since multiple pump and haul permits have been issued (included in application), it can be assumed the system has been failing. The flow for the 3-bedroom facility is 360 gal/day. The previous sandfilter was installed in 1964 prior to the Clean Water Act, so there is no associated NPDES permit (though it was originally permitted by the county (DCHD No. 9213)). Components of proposed new treatment system: • New septic tank with Effluent Filter • AdvanTex AX-20 RT Pod Recirculation Pump Chamber (integrated into AdvanTex pod) UV disinfection • Riprap at discharge point Stream and Outfall 001: The proposed discharge is to a roadside ditch to an unnamed tributary within the Panther Creek basin; 7Q10=0 (USGS low flow estimate included in application). There appears to be an implied easement in place. The old flow path crossed another property. The new proposed flow path will still cross the same property, but for a shorter distance. The flow path crosses the neighboring parcel to a roadside ditch, which flows into an unnamed tributary of Panther Creek. UT Panther Creek: [27-6-(1)], Currently classified WS-IV;NSW,CA. Not on 303d list. EAA: Sewer connection: A Town Engineer from City of Durham confirmed there was no sewer available for the address, and no future plans to extend sewer to the site. 2,800 ft of sewer line would need to be built to connect, at a total cost of $280K ($100/ft, not including tap fees, road repair costs, etc). Not economically feasible. Land application — Subsurface: The site does not have adequate space (4800 sqft needed, 4329 sq ft available). Land application — Surface drip or spray: again, inadequate space (14,053 sqft needed, 3336 sqft available). Land outside subdivision has soils that are also White Store and somewhat restrictive. A neighboring piece of vacant land totaling 0.3 acres (13000 sqft) is listed in the EAA as costing <$5k, which does not seem to be cost prohibitive and would provide adequate room for the subsurface system, however the land is not for sale.. DocuSign Envelope ID: EF6FF180-D2D7-4BF7-80A3-6E1799957609 Wastewater Reuse — Not determined to be feasible. Discharge to Panther Creek seems to be the most reasonable option for this SFR. There is an existing discharge point used by the neighboring property. The same flow path can be used by the permittee. I conclude that discharge to surface waters is most reasonable option. The staff report completed by Mikal Wilmer of ARO recommends issuance of this permit. The EAA review held with DWR engineers on 11/19/2020 found no issues with the issuance of this permit. DocuSign Envelope ID: EF6FF180-D2D7-4BF7-80A3-6E1799957609 maiemn Kegionai utrice - 5WP SFR (NCG55) Staff Report Form Verify permit Information against BIMs Information. Note any corrections required. Date 17-Jun-20 To:(Permit Writer's Name) RO Contact Person: Jane Bernard Regional Office RRO Permit Number NCG551768 Permittee David Hunt Facility Name/Address 3007 Redwood Road, Durham NC 27704 Facility County Durham Maximum permitted flow 360 gallons/day Date of Last inspection 16-Apr-I9 Why is the permit needed? What is triggering the need for a Permit? X Unpermitted properly functioning sandfilter discharge system Unpermitted failing sandfilter Permitted failing system Failed subsurface system Expanding capacity of existing discharging system Building a new single-family home, requesting a new coverage under NCG55 Functioning existing subsurface system: Owner can't expand existing system due to site constraints. new discharging system to accommodate existing and new flow. Other: Monitoring requirements for NCO089583 are 2x's per month and park staff are having trouble finding the time and getting the appropriate flow to complete the sampling requirement. Possible alternatives: spray irrigation sewer subsurface discharge none other Describe alternatives: none Location of proposed/new Discharge Point(s): Latitude 36 01' 54.09" N Longitude 78 47' 57.22" W Describe the outfall point in detail Discharge pipe will run underground to the back of Mr. Hunts property onto Mr. Blackburns (neighboring property), turning right and surfacing at public right-of-way located next to Mannix Road. Once in the right -of way it will follow the existing path for permit # NCG550790 (4712 Mannix Road originally permitted in 1996). Rip rap aeration will be added at the discharge point/public right-of-way, entering a unnamed tributary to Panther Creek. Outfall drains to: River Basin Neuse Receiving Stream Panther Creek Sub -basin NEU01 (03-04-01) Stream Classification WS-IV;NSW Stream Index 27-6-(1) Review Special Conditions/suggested changes/additional information needed/setback violations: Engineer will obtain the agreement needed from Mr. Blackburn. RO Recommendation: Supervisor approval This is a existing sand filter system. The RRO does not object to the issuance of this permit in accordance with the current policy of Single Family NPDES Discharge. Date: G .7/ Z' Zo DocuSign Envelope ID: EF6FF180-D2D7-4BF7-80A3-6E1799957609 Addendum to Single Family Staff Report: Receiving Waters Account: 1. Wastewater outfall is located within or on the vermittee's property Y or N (if "no" go to item number two below), A. Receiving feature (circle one): ground, ditch, ephemeral stream*, intermittent stream*, perennial stream*, Modified Natural Stream* b. Outfali Location: - Property boundary ditch or ditch coursing through owner's property - Roadside Ditch (permittee owns road and roadside ditch). - No receiving water feature or down gradient evidence of overland concentrated flow (the wastewater discharges onto the ground) - System extends to or connect to a common tail line within permittee's property c. Receiving water Classification: d. *Stream Rating Score: 2. Wastewater outfall footprint is located on proRertv Not owned by Permittee a. Receiving feature (circle one): ground, ditch, public right-ofy, ephemeral stream*, intermittent stream*, perennial stream*, Modified Natural Stream* b. Outfall Location: - Roadside Ditch e.. MOA NCDOT Local Government's right-of- way). - Wastewater outlets into a ditch located on property not owned by permittee - Wastewater outlets to a location where there is no receiving water feature or down gradient evidence of overland concentrated flow and this outfall is located on property not owned by permittee. - Wastewater outfall connects to a common tail line located property not owned by permittee's C. Receiving water classification: WS-IV•NSW d. *Stream Rating Score: 27-6-(1) DocuSign Envelope ID: EF6FF180-D2D7-4BF7-80A3-6E1799957609 Addendum to Single Family Staff Report: Why is the permit needed? What is triggering the need for a Permitting? Exi_ sting & New Treatment units: • Un ermitted and Properly functioning single-family sandfilter discharge system • Unpermitted failing single-family sandfilter • Failed conventional subsurface system • Expanding capacity of existing discharging single-family system • Functioning existing subsurface system: Owner is requesting to build an addition onto an existing single-family house. But, local government will not permit new flow, due to site constraints (e.g. soil, repair areas, setback constraints). Therefore, owner is requesting a new discharging system to accommodate existing and new flow. • Building a new single-family home, requesting a new coverage under NCG55 • Other DocuSign Envelope ID: EF6FF180-D2D7-4BF7-80A3-6E1799957609 ROY COOPER Governor MICHAEL S. REGAN Secretary S. DANIEL SMITH Director MEMORANDUM NORTH CAROLINA Environmental Quality To: John Hennessy NC DEQ / DWR / Water Quality Permitting Section Central Office From: Emily DelDuco Compliance and Expedited Permitting Unit Subject: Review of Discharge to Surface Waters Designated Water Supply (WS) • UT to Panther Creek [Stream Index #: 27-6-(1)]; Stream Classification: WS-IV;NSW • 100% Domestic discharge; max 360 gpd (3-bedroom at 120 gpd each) For: David Hunt - Single Family Residence 3700 Redwood Road NCG551768 - Certificate of Coverage under General Permit NCG550000 Durham County V Upon review of the subject system and discharge, DWR concludes that the outfall is located at a sufficient distance from any known or proposed public water supply intake so as not to adversely impact water quality. This assumes that the Permittee will properly operate and maintain the facility in accord with this COC and the subject NPDES General Permit. F-1 Concurs with issuance of the above permit, provided the following conditions are met: 1-1 Opposes the issuance of the above permit, based on reasons stated below, or attached: Signed Date: 11/19/2020 D EQ�� North Carolina Department of Environmental Quality Division of Water Resources 512 North Salisbury Street 1 1617 Mail Service Center I Raleigh, North Carolina 27699-1617 NoarH c oaouNa � oopanmeol f Environmental malt /� 919.707.9000