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Home My WebLink AboutWQ0007521_Correspondence_20230609..JOHN R. HARMAN P. CONSULTING ENGINEER 2112 White Oak Roadr7.q Raleigh, North Carolina 27608 (o) 919.818.2077 � 5E # - : - 9810 a (f) 919.779.0826 ~ m'IN ,,Nf<L� 't�� email='ackharman53(.& mail.com � •••• June 9, 2023 �r*ara�+►►��` Re: WQ 0022803; Engineering Progress Report 131 Centennial Court -Heritage Point Subdivision; Chatham County, NC Dear Mr. Liu: In conformance with the above referenced permit issued on March 17, 2023, and the stipulated Schedules outlined therein in Section I. "Schedules (1)" 1. Within 90 days ofpermit issuance, the Permittee shall have a licensed North Carolina Professional Engineer evaluate the permitted wastewater treatment and irrigation facilities and compare them to the Division -approved plans and specifications. The evaluation shall determine if the Permittee can physically restore the irrigation area to the Division -approved plan design, while maintaining the setbacks as required in Condition II.10. The Permittee shall submit the Wastewater Treatment and Irrigation Facility Evaluation via the Non -Discharge online portal. [1 SA NCAC 02T .0108(b)(1)(B)J this report is meant to serve that purpose. Progress Status: Several site visits have been made by me, and additionally, a Licensed Soil Scientist (Dolores Chandler, LSS), and the Contract System Operator (AQWA, Inc.) to assess the conditions of the system and the site. The treatment and dispersal system inspection report performed by the system operator on February 2, 2023 (attached) has indicated that the components are operating satisfactorily. The telemetry communication link has been restored and is now functioning properly. Average Daily Flows are in the range of 241 to 258 gallons per day (see attached Chatham co water billing Statements). Field reconnaissance measurements using GPS along with soil evaluation has indicated that there may be only 10,084 square feet available as a current application area, as compared to the previously permitted 10,659 square feet. However, Ksats measurement are scheduled to take place in the very near future (+/- June 28) to assess what impact the reduction of suitable area might have. While the reduction in the available application area is minimal, there most likely will be a determination that the system cannot be completely restored to the originally Division approved plan design. However, several remedies may exist to conform to its original intent. The Ksats (now required, but hereto fore not required) may substantiate a higher loading rate that previously permitted. Secondly, should the available area and hydraulic loading rates indicate that a lesser `gallons per day' be recommended, then a Flow Reduction request and approval should be considered an acceptable measure. In my opinion, the majority of the site modifications performed by the Permittee in the past (berms, water lines, diversion ditches, etc.) can be ameliorated by removal or relocation. At such time as the Ksats become available, and a layout concept be derived, I will make a request to the Raleigh Regional Office and Central Non -Discharge Office staff for a Pre -Design site visit to confirm applicability of the proposed re -design elements. Please advise if any questions arise. John R. Harman, PE Consulting Engineer Attachments: AQWA Inspection Report, Chatham Co. Utility Waster Bills, Chandler Soil Report & Map 1: AQ►NA AQWA Inc. 2604 Willis Court, Wilson, NC 27896 Phone: 252-243-7693 — Email: aqwatammysanders@gmail.com Customer Name: Liu, Shi Date of Inspection: 2/2/2023 Address: Liu, Shi - 131 Centennial Ct (Lot 34) Apex, NC 27523 System AX ID: AX-131279 Permit No. County: DWQ-Ral Arrival Time 01:15 PM Departure Time 03:15 PM Inspection and Maintenance ChecklistAX20 or • Surface or - Drip Dispersal r septic Tank Inspection Tank At Site Tank 1 Tank 1 Inlet Readings Tank 2 Inlet Readings 0 Scum 6 Sludge Scum Sludge Tank 1 Outlet Readings Tank 2 Outlet Readings 0 Scum 8 Sludge Scum Sludge Clean Effluent Filter: Dunked Check for Influent or Effluent Blockages: No Blockage Inspect Tank/Riser for Leaks: None Seen Control Panel Inspection Check Pump Operates In Manual Mode: Yes Recircular Pumps Recirculation Pump 1 Pump 1 Timer Settings Pump 2 Timer Settings 0.5 Dose 18.5 Rest Dose Rest Pump 1 - Counters and Elapsed Time Meters Pump 2 - Counters and Elapsed Time Meters 55373 CT 451.3 ETM CT ETM Verify Conduit Seal: Verified AX20 Treatment Pod(s) Inspection AX Treatment Pod(S) P01 Inspect for Ponding or Bridging: None Check and Record Squirt Height: 3 ft Verify Orifice Position and Assess for Clogging: Ok Check for Odors: None Clean, Brush, Flush Lateral: Done Recheck and Record Squirt Height: 3 ft Flush Pod Throroughly: Done lnspec� and Clean Vents: Vents Clear Inspection and Maintenance Checklist - AX20 (1, 2, or 3) Sub Surface or Surface Drip Dispersal j Recirculation Tank Inspection T Verify Inlet Flow: Inflow Inspect Liquid: Normal Level Record Scum/Sludge Levels: Inlet Readings: Outlet Readings: 0 Scum 12 Sludge 0 Scum 10 Sludge Inspect Tank/Riser for Leakage: None Seen Verify All Floats Work: Operating Properly Visually Check RSV and Liquid Level: Normal Verify Audible Alarm Works for High Water float: Works Properly Clean Biotube/Pump Vault Filter Cartridge: See Notes Verify Neat Wrap of Float and Pump Cords: Checked Inspect Biotube/Pump Vault Filter Cartridge: Ok Verify Conduit Seal: Verified Pull Pump and Clean Screen: Not Necessary Verify No Leaking In Piping or Flex Hoses: None Seen 13 Ultraviolet Disinfection Unit Inspection Does System Have a UV? Yes How Many UV Disinfectant Units Present? UV 1 UV D131 rat�rlt After Disconnecting Power, Clean or Replace Bulb As Needed Cleaned Flush Housing Thoroughly: Flushed Return Power and Verify Proper Function: Verified Field Dosing Tank Inspection Inspect for Tank/Riser Leakage: None Seen Inspect Liquid: Normal Level Record Scum/Sludge Levels: Inlet Readings: Outlet Readings: 0 Scum 8. Sludge 0 Scum 2 Sludge Visually Check Liquid Level: Normal Verify Audible Alarm Works for High Water float: Works Properly Verify No Leaks In Piping or Flex Hoses: None Seen Verify Neat Wrap of Float and Pump Cords: Verified Inspect Pump Intake: Ok Delivery Rate at Start Up: Unknown Verify All Floats Work: Operating Properly Verify Conduit Seal: Verified Drip Irrigation System Inspection Areas Mowed and Clear of Obstruction: Yes Area Free of Ponding or Surface Effluent: Yes Curtain Drains, Ditches, Swales Functioning Properly: Yes Control Panel Communication Checked: Panel has no phone line Inspection Notes There was no accessible water to clean filters. I bottle brushed and dunked both filters to clean them. Connor Gavin Operator Operators Signature Chatham County Utilities PO Box 910 cHAnuMco7m� Pittsboro, NC 27312-0910 www.rhatharncounty.nc.gov/wat-e.rbkN to view and pay your bill online) UTILITY BILL Customer Name Service Address LIU, SHI 131 CENTENNIAL CT LOT 34 Bill Number Bill Date Account # I Customer ID I Current Bill Due Date I Current Charges 605743 06/01 /2023 13932 26063 06/26/2023 67.00 Charge Meter Previous F Current Previous I current Usage 1 Charge Description Number Read Date Read Date Reading Reading (1,000 gals.) Amount WATER SERVICE 43362857 : 04/10/2023 : 05/09/2023; 1115 ; 1122 7000 52.00 ADMINISTRATION FEE* 15.00 o'. t History Billed Usage Current Charges 67.00 Cycle Usage Previous Billing 67.00 05/23 7000 Adjustments 0.00 04/23 7000 Less Payments Received 67.00 03/23 8000 02123 8000 Total Due $67.00 01/23 8000 12/22 8000 CURRENT CHARGES SETUP FOR AUTO DRAFT ON CURRENT BILL DUE DATE 11/22 11000 10/22 7000 09/22 9000 08/22 9000 07/22 7000 06122 9000 05/22 8000 V Detach and return the portion below with your payment v Chatham County Utilities UTILITY BILL i} PO Box 910 REMIT PORTION cNORMnMcouNTr Pittsboro, NC 27312-0910 Please write your Account Number on your check �� and enclose this portion of bill with your payment. Service Address j Bill # Account # Customer # 131 CENTENNIAL CT LOT 34 605743 13932 26063 CURRENT CHARGES SETUP FOR AUTO DRAFT ON CURRENT BILL DUE DATE LIU, SHI 131 CENTENIAL CT LOT 34 APEX, NC 27523-6724 07/16/2023 1 $0.00 06/26/2023 $67.00 Total Due $67.00 Make Checks Payable and Remit To: Chatham County Utilities PO Box 580523 Charlotte, NC 28258-0523 00006042023000605743400000067009 n Chatham County Utilities - '`�• PO Box 910 CHATHAMCo[mrr Pittsboro, NC 27312-0910 www.chathamcoun nc gov/waterbilling (to view and pay your bill online) UTILITY BILL Customer Name Service Address LIU, SHI I I 131 CENTENNIAL CT LOT 34 Bill Number Bill Date Account # Customer ID Current Bill Due Date I Current Charges 594427 05/01 /2023 1 13932 26063 05/25/2023 67.00 Charge Meter Previous Current Previous Current Usage Charge Description Number Read Date Read Date Reading Reading (1,0009 Amount WATER SERVICE 43362857 : 03/13/2023 : 04/10/2023- 1108 : 1115 : 7000 52.00 ADMINISTRATION FEE' 15.00 History Billed Usage Current Charges 67.00 Cycle Usage Previous Billing 75.50 04/23 700o Adjustments 0.00 03/23 s000 02/23 8000 Less Payments Received 75.50 01/23 8000 Total Due $67.00 12/22 8000 11/22 11000 CURRENT CHARGES SETUP FOR AUTO DRAFT ON CURRENT BILL DUE DATE 10/22 7000 09122 s000 08/22 s000 07122 7000 os/22 s000 os/22 s000 04122 8000 Detach and return the portion below with your payment V I` Chatham County Utilities UTILITY BILL i� PO Box 910 REMIT PORTION CHATHAM Co 1. 11. Pittsboro, NC 27312-0910 N Please write your Account Number on your check and enclose this portion of bill with your payment. Service Address Bill # Account # Customer # - - - 131 CENTENNIAL CT LOT 34 594427 13932 26063 06/15/2023 $0.00 CURRENT CHARGES SETUP FOR AUTO DRAFT ON CURRENT BILL - = - - - - - • - DUE DATE 05/25/2023 $67.00 Total Due $67.00 LIU, SHI 131 CENTENIAL CT LOT 34 APEX, NC 27523-6724 Make Checks Payable and Remit To: Chatham County Utilities PO Box 580523 Charlotte, NC 28258-0523 00006042023000594427700000067009 Chatham County Utilities J PO Box 910 cw.TruMoou>wrr Pittsboro, NC 27312-0910 �1 www_chathamcountync.govlwaterbilling (to view and pay your bill online) UTILITY BILL Customer Name Service Address LIU, SHI 131 CENTENNIAL CT LOT 34 Bill Number Bill Date Account # Customer ID Current Bill Due Date Current Charges 583097 04/01/2023 13932 26063 04/25/2023 75.50 Charge Meter Previous Current Previous Current Usage Charge Description Number Read Date Read Date Reading I Reading (1,000 gals.) Amount WATER SERVICE 43362857 : 02/10/2023 : 03/13/2023 1100 ; 1108 : 8000 60.50 ADMINISTRATION FEE" - 15.00 L r i History Billed Usage Current Charges 75.50 Cycle Usage Previous Billing 75.50 03/23 8000 Adjustments 0.00 02/23 8000 Less Payments Received 75.50 01/23 8000 12/22 8000 Total Due $75.50 11/22 11000 10/22 7000 CURRENT CHARGES SETUP FOR AUTO DRAFT ON CURRENT BILL DUE DATE 09/22 9000 08122 9000 07122 7000 06/22 9000 05/22 8000 04/22 8000 03122 6000 Detach and return the portion below with your payment Chatham County Utilities UTILITY BILL ii PO Box 910 REMIT PORTION CMMA-nMLIN ry Pittsboro, NC 27312-0910 " °"` Please write your Account Number on your check and enclose this portion of bill with your payment. Service Address Bill # Account # Customer # Amount Past- Date Amount Past Due 131 CENTENNIAL CT LOT 34 583097 13932 2 0063 05/15/2023 $0.00 CURRENT CHARGES SETUP FOR AUTO DRAFT ON CURRENT 11311 1 Current Bill Due Date Current Charges DUE DATE 04/25/2023 $75.50 Total Due $75.50 LIU, SHI 131 CENTENIAL CT LOT 34 APEX, NC 27523-6724 Make Checks Payable and Remit To. Chatham County Utilities PO Box 580523 Charlotte, NC 28258-0523 00006042023000583097100000075507 Chatham County Utilities J PO Box 910 Pittsboro, NC 27312-0910 �~ www.chathamwuntync.gov/waterbillin (to view and pay your bill online) UTILITY BILL Customer Name Service Address LIU, SHI 131 CENTENNIAL CT LOT 34 Bill Number Bill Date Account # Customer ID Current Bill Due Date Current Charges 571787 03/01/2023 13932 26063 03/27/2023 75.50 Charge Meter Previous Current Previous Current I Usage Charge Description Number Read Date Read Date Reading Reading 1 (1,000 gals.) Amount WATER SERVICE 43362857 : 01/10/2023 : 02/10/2023: 1092 1100 : 8000: 60.50 ADMINISTRATION FEE* 15.00 r. 1 i History Billed Usage Current Charges 75.50 Cycle Usage Previous Billing 75.50 02/23 8000 Adjustments 0.00 01123 8000 12/22 8000 Less Payments Received 75.50 11/22 11000 Total Due $75.50 10/22 7000 09/22 9000 CURRENT CHARGES SETUP FOR AUTO DRAFT ON CURRENT BILL DUE DATE 08/22 9000 07/22 7000 06/22 9000 05/22 8000 04/22 8000 03122 6000 02122 5000 Detach and return the portion below with your payment Y Chatham County Utilities UTILITY BILL PO Box 910 REMIT PORTION CTY NORAHAMCOUNPittsboro, NC 27312-0910 Please write your Account Number on your check and enclose this portion of bill with your payment. Service Address Bill # Account # I Customer # Amount Past- Date Amount Past Due 131 CENTENNIAL CT LOT 34 571787 13932��C26063 04/15/2023 $0.00 CURRENT CHARGES SETUP FOR AUTO DRAFT ON CURRENT Bill I Current Bill Due Date Current Charges DUE DATE 03/27/2023 $75.50 Total Due $75.50 LIU, SHI 131 CENTENIAL CT LOT 34 APEX, NC 27523-6724 Make Checks Payable and Remit To: Chatham County Utilities PO Box 580523 Charlotte, INC 28258-0523 00006042023000571787100000075507 'a LWA• AQWA Inc. The clear leader 2604 Willis Court, Wilson, NC 27896 Phone: 252-243-7693 — Email: aqwatammysanders@gmail.com Customer Name: Liu, Shi Inspector: Connor Gavin Arrival Time: System: Date of Inspection: Departure Time: SD 2, 2023 Current Readings Drip Irrigation Maintenance Checklist Pump Counter 5323 Filter Flush 5283 Zone Flush Zone I 125 Zone 2 Zone 3 Zone 4 5351 Timer 765 8 46 9 10 5 721 5 Flow Meter: 404560 Previous Inspection Readings Date of Previous Inspection: 9116/2022 2 Zone 3 Zone 4 Pump Counter 4138 Filter Flush 4099 Zone Flush Zone 1 98 Zone 4160 Timer 595.1 36,4 8.2 5613 Flow Meter: 368380 Elapsed Calculations Elapsed Days: 139 3 Zone 4 Pump Counter 1185 Filter Flush 1184 Zone Flush Zone I 27 Zone 2 Zone 1191 Timer 1707 Total Flow Since Last Visit: Spin Filter: Cleaned 105 36180 23 1602 Number of Days: 139 Average Daily Flow: 260.2877698 Filtrate Return Line: No Zone Testing 25 •. 15 7.1 11 Of �-� 101 0 Inspection Comments Fixed 17 leaks in zone 3 and 2 complete breaks. Zone 1 and 2 nonfunctional handler arporation 4/7/2023 Shi Lui Dear Shi, Chandler Soil Corporation finished the soil evaluation for the surface drip field at 131 Centennial Ct, Chatham County. The original soil work of 2003 found 15,500 square feet of soil suitable for Aerobic Pretreatment Surface Drip. Of that area, 10,659 square feet was needed to layout the drip line (0.4 Inches/Hr.), due to topography and vegetation variation. The minimum area needed, calculated in that report, was 10,042 square feet. Our current work found a total of 10,084 square feet of soil that are suitable for Aerobic Pretreatment Surface Drip. Therefore, the field will have to be redesigned to see if the drip line can fit in the 10,084 square feet. However, hydraulic conductivity tests, which were not required in 2003, may produce a different minimum area. We found the soils in the previously permitted area are not compacted, however, there was an area that we identified in 2003 as unsuitable with a seasonal high-water table above 12 inches and expansive clay too close to the surface to provide any infiltrative surface. We re -delineated these shallow soils from the surface drip suitable soils. This unsuitable area is surrounded in red on the map and is cordoned off with caution tape in the field. This unsuitable area is 1,213 square feet. We also looked at an additional area, noted on the map in bright green, and found 3 to 9 inches of expansive clay fill over the native soil. This soil will be suitable for use if the fill is carefully taken off of the field along with some of the small pines. That area is 638 square feet. The design wish to remove the most northeastern corner from the field is not possible. The Map and the Soils The map shows the location of our borings along with the following: • The original permit area of 15,500 square feet in Blue along with the Plat Book and Page, • The permitted area of 10,659 square feet in Purple used during installation of the field, • The area of 1,213 square feet in Red that is excluded due to unsuitable soil, and • The additional area of 638 in Green will be suitable once the fill is removed. The map also shows the pond in the northeast corner of the lot which captures surface runoff, along with a 25- foot buffer around it. The rules allow a 25-foot setback from surface water diversions. This may have to be determined by the Water Resources division of the NC DEQ. The soil restrictions on this lot include: • Expansive clay (e) • Soil Wetness (w) 2818 Old NC Hwy 10, Chapel Hill, NC 27514 • Tel: 919-932-8514 • Email: ChandlerSoil@earthlink.net Chandler Soil Corporation 2 Evaluation of Surface System Conditions for Shi Lui 131 Centennial Ct, PID 80900, Chatham County, NC. 4/7/2023 Soil wetness is a term used to describe soils that are saturated regularly or on a seasonal basis. Over time, the water reveals the soil's grayish colors, which can be evaluated even in wet or dry weather with a Munsell Color Book. Soil drainage mottles with a chroma of 2 or less are unsuitable if they are within 12 inches of the surface. Expansive clay swells and shrinks as the soil wets and dries. The swelling of the clays restricts water movement through the soil. The Next ste s involving the draintield 1) As the permit WQ0022803 requires: Within 120 days of permit issuance (March 17, 2023), the Permittee shall have a licensed North Carolina Soil Scientist evaluate the permitted 0.24 acre drip irrigation area to determine if it is capable of accepting the permitted flow of 480 GPD (i.e., 27.9 inches per year). The soil evaluation shall specifically address soil features such as soil compaction and saturated hydraulic conductivity of the least permeable layer; soil fertility and amendments added; and any other properties that might impact the soil's ability to accept irrigated effluent. The Permittee shall submit the Soil Evaluation via the Non -Discharge online portal. [15A NCAC 02T .0108(b)(1)(B)] 2) We have already determined that the soil is not compacted. Next, we must perform the testing that is required. The hydraulic conductivity tests cost approximately $3000-$3500. These tests determine the rate of water movement through the soil. The testing is weather dependent. (1) If a storm system is moving in, the water moves slower down through the soil, providing us with lower conductivities, which is not our desired outcome. (2) The tests cannot be completed when the temperature is below 45. Again, the cold weather provides us with lower conductivities. (3) If the soil is too wet, we cannot perform the testing until it has reached a moisture content of 45% or less. 3) Fertility sampling is also required. Chandler Soil Corporation Evaluation of Surface System Conditions for Shi Lui 131 Centennial Ct, PID 80900, Chatham County, NC. 4/7/2023 Finally, our evaluation was made in accordance with the "Laws and Rules for Sewage Treatment, and Disposal Systems" 15A NCAC 18A .1900, along with the 15A NCAC 2T. 0600 regulations for "Waste Not Discharged to Surface Waters". We guarantee that our work was performed to professional standards. Thank you for your business. Contact us if you have any questions or if we assistance. Sincerely, Dolores Chandler North Carolina Licensed Soil Scientist #1187 Enclosed: Map. 4/7/2023 General Soils Evaluation for On -site Sewage Treatment & Disposal 3±Acres, 131 Centennial Court, Parcel ID:80900 New Hope Township, Chatham County ea enlarged below April 4 & S, 2023 . C",77_77 -- Permit area = 10,659 sf _ 4 i \ ` Minus bad area = Remaining area = 1,213 sf 9,446 sf Add good area = 638 sf Total area = 10,084 sf Borings Soil Conditions M (_ r W 803 1 �— Boring Position 11--1 Boring Numbers e = Expansive clay — — -- — 4" e'�'� b Soil Condition w = Soil wetness �••�'••�"'�" Boring Depths Original permit �Zll. Current permit ' Exclude . Add Survey property line GIS property line Setbacks I� VI GIS parcels V /n � 2 ft contour / ,/ 100 ft. contour V/ Water I\V Manipulated areas House o Found comer ,handler )oil orporation Intended for preliminary planning only. Areas will require government approval. Areas will 2818 Old NC Hwy 10 need further delineation. Boundaries of the areas are subject to change upon further Chapel Hill, NC, 27514 investigation. Some adjustments may be necessary at that time due to soil variability and 919-932-8514 topographic irregularities. Map compiled from county CIS, deeds, surveys and plats. Not chandlersoil@earthlink.net survey accurate. https://www.chandlersoilcorporation.com/