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HomeMy WebLinkAboutSoilsEvaluationReport Soil Suitability for Sewage Treatment and Disposal Systems Prepared For: M&R Entitlement, LLC, Client Prepared By: Jeff Vaughan, Ph.D., L.S.S. Senior Agronomist/Soil Scientist Trent Bostic, Associate Soil Scientist Report Date: June 17, 2021 Spring Hill Church Road Lillington, NC Harnett County PIN: 0519-68-7021.000 1 Soil Suitability for Sewage Treatment and Disposal Systems Spring Hill Church Road, Lillington, NC 27546 PREPARED FOR: M&R Entitlement, Client PREPARED BY: Jeff Vaughan Trent Bostic DATE: June 17, 2021 Soil suitability for domestic sewage treatment and disposal systems was evaluated on June 16, 2021, for property located at Spring Hill Church Road in Lillington, NC. Trent Bostic and Alex Thompson of Agri-Waste Technology, Inc. (AWT) conducted the soil evaluation. The detailed soil evaluation of the land area will follow. Property reference maps are in Attachment 1. A review of the soil and landscape characteristics that dictate soil suitability for domestic sewage treatment and disposal systems can be found in Attachment 2. The total property area is approximately 59.7 acres. The property is mostly pastureland with some drainage features throughout. A pond is also located on the property. Soil Suitability for Domestic Sewage Treatment and Disposal Systems The aerial map in Attachment 3 details the approximate property boundaries, soil boring locations, soil types, and soil areas for septic systems. Numerous soil borings were advanced on the property (Attachment 3). A portion of the property contained drainage features, complex topography, and/or unsuitable soils and, thus, are unsuitable for septic systems. However, this evaluation was merely a preliminary review to determine what potential this land might have for domestic sewage treatment and disposal systems. Therefore, specific types of septic systems, exact locations of future drainfields and repair areas, plus buffers from property lines (current and potential future lot lines), building foundations, wells, etc. are not fully considered. These things will need to be more fully considered as the plans develop for the potential future of this site. It is possible that additional soil evaluations will be required once lot layouts are considered and developed for this property so that septic system types and the location of a septic drainfield can be more fully and appropriately considered. Area 4 (see map in Attachment 3) exhibited soil characteristics and soil depths (18” or greater) that is provisionally suitable for subsurface drip septic systems. This area is approximately 54,055 ft2 as shown on the map in Attachment 3. The remainder of the 2 highlighted areas (Areas 1-3) exhibited soil characteristics and soil depths (24” or greater) that is provisionally suitable for conventional septic systems. Theses areas are approximately 1,060,563 ft2, 524,708 ft2, and 54,179 ft2 respectively, as shown on the map in Attachment 3. Typical profile descriptions of the provisionally suitable soil for this property are in Attachment 4. Three distinct soil profiles were observed in the soil borings on the property. The provisionally suitable soil borings had the following characteristics. Soil texture was provisionally suitable and was estimated to be loamy sand near the soil surface (A and E horizons) and sandy clay loam in the subsoil (B horizons). Soil structure was provisionally suitable and was estimated to be granular near the soil surface (A and E horizons) and subangular blocky in the subsoil (B horizons). Clay mineralogy was provisionally suitable with very friable to friable moist soil consistence and non-sticky to sticky and non-plastic to plastic wet soil consistence. The major soil type on this property is Dothan loamy sand (map symbol DoB), Fuquay loamy sand (map symbol FaB), and Gilead loamy sand (map symbol GaB). The Harnett County Soil Survey indicates that septic system installation in these soils is severe (Attachment 5). The land area required for a conventional septic system is calculated based on the size of the proposed facility and the Long-Term Acceptance Rate (LTAR) of the soil. The LTAR range for the provisionally suitable soils on this property is 0.3 – 0.6 GPD/ft2 based on the most restrictive soil texture in the subsoil. The LTAR suggested by AWT for a majority of the conventional provisionally suitable soil is 0.4 GPD/ft2, but the final LTAR for specific septic system types and septic drainfield locations will be set by the Harnett County Health Department. Generally, 6,000-8,000 ft2 of suitable soil for conventional septic systems is required for a 3-bedroom home. The detailed computations are in Attachment 6. The land area required for a subsurface drip septic system is calculated based on the size of the proposed facility and the Long-Term Acceptance Rate (LTAR) of the soil. The LTAR range for the provisionally suitable soils on this property is 0.05 – 0.1 GPD/ft2 based on the most restrictive soil texture in the subsoil. The LTAR suggested by AWT for most of the subsurface drip provisionally suitable soil is 0.1 GPD/ft2, but the final LTAR for specific septic system types and septic drainfield locations will be set by the Harnett County Health Department. Generally, 9,000-11,000 ft2 of suitable soil for conventional septic systems is required for a 3-bedroom home. The detailed computations are in Attachment 6. 3 Conclusions Based on the results of this evaluation, the installation of multiple subsurface septic system seems very probable on this property in the areas designated on the map in Attachment 3. A detailed site plan and design will be needed to maximize the space. Conventional septic systems usually cost between $12,000-$20,000 to install. Subsurface drip septic systems usually cost between $20,000-$30,000 to install and an additional $6,000-$8,000 to design and permit. We appreciate the opportunity to assist you in this matter. Please contact us with any questions, concerns, or comments. Harnett County GIS, Harnett County Public Utilities Aerial Recycle Center Landfills Surrounding County Boundaries Federal Property City Limits Harnett County Boundary Address Numbers Airport MajorRoads Interstate NC US Roads Mile_Markers Railroad Parcels 0 330 660165Feet 1 inch = 376 feet ² May 24, 2021NOT FOR LEGAL USE .GIS/E-911 Addressing Property ID#: 0519-68-7021.000 Property Recorded: County: Harnett SOIL/SITE EVALUATION FOR ON-SITE WASTEWATER SYSTEM Applicant: M&R Entitlement Owner: X Agent: Phone: 919-842-0334 Address: Sanford, NC Dates Evaluated: 06/16/2021 Proposed Facility: Single Family Residence(s) Property Size: 59.7 acres Location Site: Spring Hill Church Road Water Supply: On Site Well X Comm. Well Public Other Evaluation Method: Auger Boring: X Pit PROFILE 1: Typical Profile Description (DoB – Dothan loamy sand) Horizon/ Depth (IN) Matrix Mottles Mottle Abundance / Contrast (a)(1) Texture (a)(2) Structure (a)(3) Minerology Consistence (Wet) Consistence (Moist) Ap 0-13” 10YR 4/3 - - SL GR NEXP NS, NP Vfr Bt1 13-22” 10YR 5/8 - - SCL SBK SEXP SS, SP Fr Bt2 22-36” 10YR 5/8 - - SCL SBK SEXP SS, SP Fr .1940 Landscape Pos/Slope % PS Profile LTAR N/A .1942 Wetness Condition PS System Type Conventional .1943/.1956 Saprolite PS .1944 Restrictive Horizon PS .1948 Profile Classification PS Comments: Some auger refusal at 18”+ PROFILE 2: Deep Boring Profile (FaB – Fuquay loamy sand) Horizon/ Depth (IN) Matrix Mottles Mottle Abundance / Contrast (a)(1) Texture (a)(2) Structure (a)(3) Minerology Consistence (Wet) Consistence (Moist) Ap 0-8” 10YR 5/2 - - S G NEXP NS, NP Vfr E 8-34” 2.5Y 6/4 - - S GR NEXP NS, NP Vfr Bt1 34-36”+ 10YR 6/6 - - SL SBK SEXP SS, SP Fr .1940 Landscape Pos/Slope % PS Profile LTAR N/A .1942 Wetness Condition PS System Type Conventional .1943/.1956 Saprolite PS .1944 Restrictive Horizon PS .1948 Profile Classification PS Comments: Some auger refusal at 18”+ PROFILE 3: Typical Profile Description (GaB – Gilead loamy sand) Horizon/ Depth (IN) Matrix Mottles Mottle Abundance / Contrast (a)(1) Texture (a)(2) Structure (a)(3) Minerology Consistence (Wet) Consistence (Moist) Ap 0-5” 10YR 6/3 - - LS GR NEXP NS, NP Vfr Bt1 5-8” 10YR 6/6 - - SCL wSBK SEXP SS, SP Fr Bt2 8-22” 7.5YR 6/6 - - SC SBK SEXP SS, SP Fr Bt3 22-36”+ 10YR 6/6 2.5YR ¾ 2, m, D SC SBK SEXP SS, SP Fr .1940 Landscape Pos/Slope % PS Profile LTAR N/A .1942 Wetness Condition PS System Type Conventional .1943/.1956 Saprolite PS .1944 Restrictive Horizon PS .1948 Profile Classification PS Comments: Some auger refusal at 18”+ EVALUATED BY: Trent Bostic & Alex Thompson COMMENTS: LEGEND OF ABBREVIATIONS FOR SOIL/SITE EVALUATION FORM LANDSCAPE POSITION STRUCTURE MOTTLES CC – Concave Slope G – Single Grain 1 – Few CV – Convex Slope M – Massive 2 – Common DS – Debris Slump CR – Crumb 3 – Many D – Depression GR – Granular DW – Drainage Way SBK – Subangular Blocky f – Fine FP – Flood Plain ABK – Angular Blocky m – Medium FS – Foot Slope PL – Platy c – Coarse H – Head Slope PR – Prismatic I – Interfluve (w in front denotes “weak”) F – Faint L – Linear Slope D – Distinct N – Nose Slope P – Prominent P – Pocosin R – Ridge S – Shoulder T – Terrace MOIST CONSISTENCE WET CONSISTENCE MINERALOLOGY VFr – Very Friable NS – Non Sticky NEXP – Non Expansive Fr – Friable SS – Slightly Sticky SEXP – Slightly Expansive Fi – Firm S – Sticky EXP – Expansive VFi – Very Firm VS – Very Sticky EFi – Extremely Firm NP – Non Plastic SP – Slightly Plastic P – Plastic VP – Very Plastic TEXTURE GROUP TEXTURE CLASS .1955 LTAR (gal/day/sq.ft.) I S – Sand 1.2 – 0.8 LS – Loamy Sand II SL – Sandy Loam 0.8 – 0.6 L – Loam III SCL – Sandy Clay Loam 0.6 – 0.3 CL – Clay Loam SiL – Silt Loam Si – Silt SiCL – Silty Clay Loam IV SC – Sandy Clay 0.4 – 0.1 SiC – Silty Clay C – Clay D D D D D D DD D D D D D !( !( !( !. !( !.!. !. !. !. !. !. !.!. !. !( XY !. !. !. !. !. !( !. !. !( !( !( !( !( !( !( !. !(!(!. !. !. !. !( !( !(!.!. !. !. !. !( !( !( !. !. !.!. !( !( !( !( !. !.!( !( 0 200 400100Feet Agri-Waste Technology, Inc.501 N. Salem St. Suite 203Apex NC 27502P: 919.859.0669www.agriwaste.com ± Parcel Parcel Buffer 10' 2 ft. Contour Surface Water Surface Water Buffer 50' D Auger Refusal XY Unsuitable/Wet Soil Boring Depth (in.) !(18-23" !(24-29" !(30-35" !.36"+ Evaluation Unsuitable Topo Disturbed Area 1 Area 2 Area 3 Area 4 Drawn By: Julie DavidsonReviewed By: Jeff VaughanDate: 6/17/2021 Preliminary Soil Evaluation M & R EntitlementHarnett Co., NC PIN: 0519-68-7021.000 Suitable Area: Area 1 ~ 1,060,563 sq.ft.Area 2 ~ 524,708 sq.ft.Area 3 ~ 54,179 sq.ft.Area 4 ~ 54,055 sq.ft. Soil Type: Bb-Bibb soilsDoB-Dothan loamy sand,FaB-Fuquay loamy sandGaB-Gilead loamy sand *Surface water and/or bad topo areas have not been officially evaluated for stream ID according to local regulatory requirements. This map is intended for preliminary purposes only and not to be used as a plat/survey or can it be assumed all streams are identified on this property.* D D D D D D DD D D D D D !( !( !( !. !( !.!. !. !. !. !. !. !.!. !. !( XY !. !. !. !. !. !( !. !. !( !( !( !( !( !( !( !. !(!(!. !. !. !. !( !( !(!.!. !. !. !. !( !( !( !. !. !.!. !( !( !( !( !. !.!( !( FaB Bb Bb GaB DoB NoC DoB W BnB GaB DoB CeB FaB GaB GaB GaB GaB DoABnB StA FaB S p rin g H ill C hu rch R d 0 200 400100Feet Agri-Waste Technology, Inc.501 N. Salem St. Suite 203Apex NC 27502P: 919.859.0669www.agriwaste.com ± Parcel Parcel Buffer 10' Surface Water Surface Water Buffer 50' Soil Type D Auger Refusal XY Unsuitable/Wet Soil Boring Depth (in.) !(18-23" !(24-29" !(30-35" !.36"+ Evaluation Unsuitable Topo Disturbed Area 1 Area 2 Area 3 Area 4 Drawn By: Julie DavidsonReviewed By: Jeff VaughanDate: 6/17/2021 Preliminary Soil Evaluation M & R EntitlementHarnett Co., NC PIN: 0519-68-7021.000 Suitable Area: Area 1 ~ 1,060,563 sq.ft.Area 2 ~ 524,708 sq.ft.Area 3 ~ 54,179 sq.ft.Area 4 ~ 54,055 sq.ft. Soil Type: Bb-Bibb soilsDoB-Dothan loamy sand,FaB-Fuquay loamy sandGaB-Gilead loamy sand *Surface water and/or bad topo areas have not been officially evaluated for stream ID according to local regulatory requirements. This map is intended for preliminary purposes only and not to be used as a plat/survey or can it be assumed all streams are identified on this property.* Conventional Septic System Area Computation Created by:TB Created on:2/6/2017 Updated on:N/A Client Name:M&R Entitlement Number Bedrooms:3 Design Flow (gal/day):360 (120 gal/day/bedroom, minimum 240 gal/day/dwelling) LTAR (gal/day/ft2)0.4 Trench Bottom Area (ft2):900 (Design flow/LTAR) Trench Width (ft):3 On-center distance between trenches (ft):9 Trench Bottom Length (ft):300 (Conventional - Pipe & Gravel) Minimum Field Area Required (ft2):2700 (Trench Bottom Length*Trench on-center distance) Minimum Field Area Required (Innovative) (ft2):2025 (25% reduction from above) Total Field Area Required (ft2)(1):6750 (Minimum field area*2.5) Total Field Area Required (Innovative) (ft2)(1):5062.5 (25% reduction from above) Total Field Area Required (ft2)(1):8100 (Minimum field area*3) Total Field Area Required (Innovative) (ft2)(1):6075 (25% reduction from above) (1) Provides for reserve area and soil irregularity, 2.5 to 3 is multiplier. Client Name:M&R Entitlement Number Bedrooms:4 Design Flow (gal/day):480 (120 gal/day/bedroom, minimum 240 gal/day/dwelling) LTAR (gal/day/ft2)0.4 Trench Bottom Area (ft2):1200 (Design flow/LTAR) Trench Width (ft):3 On-center distance between trenches (ft):9 Trench Bottom Length (ft):400 (Conventional - Pipe & Gravel) Minimum Field Area Required (ft2):3600 (Trench Bottom Length*Trench on-center distance) Minimum Field Area Required (Innovative) (ft2):2700 (25% reduction from above) Total Field Area Required (ft2)(1):9000 (Minimum field area*2.5) Total Field Area Required (Innovative) (ft2)(1):6750 (25% reduction from above) Total Field Area Required (ft2)(1):10800 (Minimum field area*3) Total Field Area Required (Innovative) (ft2)(1):8100 (25% reduction from above) (1) Provides for reserve area and soil irregularity, 2.5 to 3 is multiplier. Client Name:M&R Entitlement Number Bedrooms:5 Design Flow (gal/day):600 (120 gal/day/bedroom, minimum 240 gal/day/dwelling) LTAR (gal/day/ft2)0.4 Trench Bottom Area (ft2):1500 (Design flow/LTAR) Trench Width (ft):3 On-center distance between trenches (ft):9 Trench Bottom Length (ft):500 (Conventional - Pipe & Gravel) Minimum Field Area Required (ft2):4500 (Trench Bottom Length*Trench on-center distance) Minimum Field Area Required (Innovative) (ft2):3375 (25% reduction from above) Total Field Area Required (ft2)(1):11250 (Minimum field area*2.5) Total Field Area Required (Innovative) (ft2)(1):8437.5 (25% reduction from above) Total Field Area Required (ft2)(1):13500 (Minimum field area*3) Total Field Area Required (Innovative) (ft2)(1):10125 (25% reduction from above) (1) Provides for reserve area and soil irregularity, 2.5 to 3 is multiplier. Drip Septic System Area Computation Created by:JV Created on:6/20/2001 Updated on:5/19/2021 Client Name:M & R Entitlement Number Bedrooms:3 Design Flow (gal/day):360 (120 gal/day/bedroom, minimum 240 gal/day/dwelling) LTAR (gal/day/ft2)0.1 Trench Bottom Area (ft2):3600 (Design flow/LTAR) Trench Width (ft):0 On-center distance between trenches (ft):2 Trench Bottom Length (ft):1800 Minimum Field Area Required (ft2):3600 (Trench Bottom Length*Trench on-center distance) Total Field Area Required (ft2)(1):9000 (Minimum field area*2.5) Total Field Area Required (ft2)(1):10800 (Minimum field area*3) (1) Provides for reserve area and soil irregularity, 2.5 to 3 is multiplier. Client Name:M & R Entitlement Number Bedrooms:4 Design Flow (gal/day):480 (120 gal/day/bedroom, minimum 240 gal/day/dwelling) LTAR (gal/day/ft2)0.1 Trench Bottom Area (ft2):4800 (Design flow/LTAR) Trench Width (ft):0 On-center distance between trenches (ft):2 Trench Bottom Length (ft):2400 Minimum Field Area Required (ft2):4800 (Trench Bottom Length*Trench on-center distance) Total Field Area Required (ft2)(1):12000 (Minimum field area*2.5) Total Field Area Required (ft2)(1):14400 (Minimum field area*3) (1) Provides for reserve area and soil irregularity, 2.5 to 3 is multiplier. Client Name:M & R Entitlement Number Bedrooms:5 Design Flow (gal/day):600 (120 gal/day/bedroom, minimum 240 gal/day/dwelling) LTAR (gal/day/ft2)0.1 Trench Bottom Area (ft2):6000 (Design flow/LTAR) Trench Width (ft):0 On-center distance between trenches (ft):2 Trench Bottom Length (ft):3000 Minimum Field Area Required (ft2):6000 (Trench Bottom Length*Trench on-center distance) Total Field Area Required (ft2)(1):15000 (Minimum field area*2.5) Total Field Area Required (ft2)(1):18000 (Minimum field area*3) (1) Provides for reserve area and soil irregularity, 2.5 to 3 is multiplier.