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Home My WebLink AboutNCG551805_Fact Sheet_20240222 DocuSign Envelope ID:61F73830-2959-4C3F-88D8-50B312605700 NCDEQ/DWR/NPDES SINGLE-FAMILY RESIDENCE FACT SHEET NPDES Permit NCG551805 Caroline Robinson/Compliance&Expedited Permitting Unit/caroline.robinson(kdeq.nc.gov/Jan 2024 FACILITY INFORMATION Applicant/Facility Name Alan Purvis (owner)/Purvis Residence Applicant/Mailing Address 197 Stonecrest Way Pittsboro,NC 27312 c/o Alan Purvis Facility Physical Address 197 Stonecrest Way Pittsboro,NC 27312 Proposed Flow Currently discharging 480 GPD (4-bedroom home) Type of Waste 100%Domestic, Single-Family Residence County Chatham Regional Office RRO STREAM CHARACTERISTICS An intermittent stream that is on Stream Receiving Stream the applicant's property,which WS-IV;NSW flows into Wilkinson Creek Classification Stream Segment 16-35 Outfall Lat. 350 50' 16.84"N 7Q 10 - Summer(cfs) 0 Outfall Long. 790 08'23.04"W 7Q 10 -Winter(cfs) 0 Drainage basin Cape Fear River 30Q2 (cfs) 0 Subbasin 03-06-04 Average Flow(cfs) 0 HUC 030300020701 Parcel Size(acres) 1.978 Application Summary Applicant is seeking coverage under the NCG550000 general permit for discharge of their 100%domestic waste. The property currently has a 4-bedroom house with a failing septic system and the application is for a 4-bedroom house with a proposed flow of 480 GPD(120 GPD per bedroom). The property has a failing existing conventional septic tank/leach field system that was identified as failing and unsuitable for repair by the Chatham County Public Health Department,Environmental Health Division due to unsuitable soil wetness conditions. A hydraulic assessment of the property conducted by Eagle Resources,P.A. on March 18,2021 included direct piezometer groundwater monitoring and groundwater flow modeling and the results indicated that lateral subsurface water flow is directly impacting the existing septic system at the property,resulting in surface discharge of wastewater over the system area. The system was installed and approved on Oct 22,2019. A Construction Authorization Permit for a repair authorized on 7/22/2020 and the system was installed and approved on July 30,2020. The system then malfunctioned shortly after the repair was installed and approved and Applied Resource Management,PC was contacted in November 2021 to perform a soil evaluation and found that the existing wastewater system was ponded and full of effluent. The septic tank was originally permitted by the Chatham County Public Health Department,PREH2O2004097. The existing components contain a septic tank, dosing tank, leach field, and an interceptor drain around drainfield. The applicant is proposing the new system will replace the failed existing system, for which multiple repair attempts have been made.Utilize the existing septic and pump tanks and replace failed system with AdvanTex AX20 pod with treated effluent to flow through UV system and then to discharge point with Fact Sheet for New Permit/COC Jan 2024—NPDES Permit NCG551805-Page 1 DocuSign Envelope ID:61F73830-2959-4C3F-88D8-50B312605700 riprap. The proposed discharge location is to an intermittent stream that is on the applicant's property, which flows into Wilkinson Creek. The Chatham County Health Department indicated that the site is unsuitable for installation of a ground absorption septic system per the results of Mr. Eric Lappala,PE,PH of Eagle Resources. Chatham County Health Department have determined that no improvement permit can be issued due to unsuitable soil wetness conditions and unforeseeable lateral flow concerns(as described in a letter dated March 22, 2023).A soil evaluation by Walter Giese, LSS determined that the site does not have suitable soil to accommodate a non-discharge surface spray or drip wastewater system. Proposed Improvements and Construction The failed existing system will be replaced with the following treatment system: • Existing Septic Tank with Effluent Filter • Existing Pump Tank as Recirculation Tank with Pump Vault • AdvanTex AX-20 RT Pod • Recirculating Splitter Valve • LTV Disinfection • Discharge Point with Rip-Rap • Control Panel Regional Office Staff Report Jane Bernard at the Raleigh Regional Office recommends issuance of this permit based on the site visit. Alternatives Summary(EAA): Connection to sewer system • The nearest city public sewer connection is located more than 4,500 feet away(0.85 miles)as the crow flies.An estimated cost/ft would be $100/ft for line plus engineering and tap fees(over $450,000). Ground(subsurface)Adsorption • The Chatham County Health Department indicated that the site is unsuitable for installation of a ground absorption septic system per the results of Mr. Eric Lappala,PE,PH of Eagle Resources. Chatham County Health Department have determined that no improvement permit can be issued due to unsuitable soil wetness conditions and unforeseeable lateral flow concerns(as described in a letter dated March 22, 2023). The sloping site(sloping from front to back)has a course textured soil (sandy loam)over a finer textured soil(sandy clay loam and clay)lateral water movement was a concern(Chatham County Env. Health July 30, 2020) Non-Discharge (Drip& Spray) • A soil evaluation by Walter Giese,LSS determined that the site does not have suitable soil or sufficient area to accommodate a non-discharge surface spray or drip wastewater system. Reclaimed Water • Inadequate soil and insufficient space for reuse.No reasonable ability to operate as a bulk distributor of reclaimed water. Availability of Land • The surrounding lots contain single-family residences. The soil types for these properties is White Store—very restrictive for wastewater systems Fact Sheet for New Permit/COC Jan 2024—NPDES Permit NCG551805-Page 2 DocuSign Envelope ID:61F73830-2959-4C3F-88D8-50B312605700 Adjoining Property Values Neighboring Property Area(ac) Vacant Price of Land(51 PIN 9755-00-89-9844(East) 2.021 N 202,950 PIN 9756-00-80-5048(West) 1.920 N 206,683 PIN 9755-00-89-2782(South) 17.963 N 262,025 Local Government Review • Local Government Review Forms sent to Chatham County—the completed forms have not been received as of the date of application. Chatham County Land Rewrds Viewer —dN,,&P1-1,--, F1..dH—,d--r Cp-D-P—1 tw--r-way x 4 3.961A tea® 9zen 1.3 • 1.693A m9n 93978 1.1�J3P, 3.944A 92885 • � IS ALANKETUX DARA \ rOR-0:PUPVIS AIANK E PUR IS 1.920A ueA Value 5203 342 mem :5334,620 92859 Tme Velur S)39962 Deeded Adeege:1978 C��_:Dwd:2076/0815 Plee 20181 W96 Legal Dexripdon:LOT 48 1 988� Psn Te D.—NORTH CHATHAM NRE riAdd—r91—NE1111 aY Current Omen:PURJIS ALAN K&PURVIS DRA 91 ng Address:197STONECRESl WAY 9dI1e9 S G 31 TTSBORO z rc 1771 17.963A,(17.883A) L.b Le.3aK�tH &a+39aJ 1iwMK q �, tw — �, W J. oKct J1sx• v 14.0 2,$,q Mo 01srwc Cw9 wAc,.,9kL oQ. Mwdan' �ou5f L. bdvs DuiA �Kt f+Lyn94 r,•4 `,i q C6 aaaNra ,p \ ID 1 r-. Fact Sheet for New Permit/COC Jan 2024—NPDES Permit NCG551805-Page 3 DocuSign Envelope ID:61 F73830-2959-4C3F-88D8-50B312605700 Chatham County Tax Mao �m 93973 •1893 d' �\ s • 93970 l• � mak` mac+ ��/ •• • • . �off(' eaJ`.�dR PYZ z Unnamed Blue-Line z, o a6a1 w'a Intermittent stream •'o- P-7 leading directly to J168R '`� 93 Wilkinson Creek93978 1697 �• Point unnamed 1_ •• intermittent stream 93977 92855 <I converges with s Wilkinson Creek F— °st Way • Legend • • • 1171 Parcel Pop-Up Pamds • 92"' Riven l Streams Discharge Point: _ Streams/ Directly discharges Rivers • to intermittent Intermittent • 6%08 stream on the Purvis Streams property Lakes/Ponds • ;0291 • Address Points 85589 - 1773 Cost Analysis for Four(4)Bedroom SFR Present Install 20 yr Total Cost Value Cost Annual Cost 20 years of Costs System Type ($) ($) ($) (S) Sub-Surface System $50,700 $24,122 $74,622 $71,812 Non-Discharge System $64,700 $21,832 $86,532 $83.81 B Reclaimed System 586,900 $73.085 $159,985 $151,078 Discharge System $27.500 $18.959 $46,459 544.096 Fact Sheet for New Permit/COC Jan 2024—NPDES Permit NCG551805 -Page 4