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Home My WebLink AboutSW6120802_Geotechnical Report_20120806May 3, 2012 Bojangles' Restaurants, Inc. c/o The Issacs Group, P.C. 8720 Red Oalc Blvd., Suite 420 Charlotte, North Carolina 28217 Attention: Mr. Brian Upton, P.E. Em R@12916La AUG -62012 Reference: Stormwater BVIP Soil Testing Seasonal High Water Table Determination and Hydraulic Conductivity Testing Proposed Bojangles' Restaurant Chicken foot Road at Corporation Drive I -lope Mills, Cumberland County, North Carolina S&ME, Inc. Project No. 1351-12-060 Dear Mr. Upton: S&ME, Inc. (S&ME) has conducted Stormwater Best Management Practices (BMP) Soil Testing in accordance with S&ME Proposal No. 1351-25206-12 dated April 4, 2012. The Stormwater 13MP Soil "Testing was performed to provide information fora Stormwater Management Permit Application to the North Carolina Department of Environment and Natural Resources (NCDENR) — Division of plater Quality (DWQ) and/or local regulatory agency. A soil scientist investigation was conducted to evaluate the soil properties of one (1) proposec! Stormwater BMP area (Infiltration Devices) to determine suitability for Stormwater management systems. The soil scientist investigation was conducted to evaluate: seasonal high water table (SI-IWT) elevations and in -situ soil infiltration rate (ill -situ saturated hydraulic conductivity testing). PROJECT BACKGROUND '['he subject property is located on the north side of Chicken Foot Road between Corporation Drive and the I-95 Bypass northbound ramp in Hope Mills, North Carolina (Figure 1). The area evaluated consisted of an open power line casement. An S&ME soil scientist conducted an evaluation of the soils within area identified on a site plan provided by The Issacs Group, P.C., which identified the proposed sormwater management system area. The soil scientist evaluation was conducted to evaluate the suitability of the soil properties relative to Stormwater Management permitted by the S&ME, INC. / 3718 Old Battleground Road / Greensboro, NC 27410 / p 336.288.7180 f 336,288.8980 / www.smeinc.com Stormwater BMP Soil Testing S&ME Project No. 1351-12-060 Hope Mills Bojangles May 3, 2012 NCDI?NR-DWQ. One stormwater BMP location was identified and consisted of a proposed Infiltration Device. Maps were prepared using Arcview 10.1 a Geographic Information System (GIS). Base maps were generated using information from the following sources: I SRI, Inc., Bing Map Web Site, and a site plan provided by The Issacs Group, P.C. (Figures 1-3). FINDINGS Seasonal High Water Table Determination The SI-LWT evaluation was performed by advancing a hand auger boring to a depth of approximately 6 feet below ground surface (bgs) at the proposed stormwater management system area. The location of the SI-I WT evaluation was approximated in the field. During the hand auger advancement, soils were evaluated by a Licensed Soil Scientist for evidence of SHWT influence. This evaluation involved looking at the actual moisture content in the soil and observing the matrix and mottle colors. Depending on the soil texture, the soil color will indicate processes that are driven by seasonally high water table fluctuations, such as iron reduction and oxidation and organic matter staining. Please note that SHWT evaluations are based on secondary evidence and not on direct groundwater level measurements. Groundwater levels fluctuate for numerous reasons and these findings do not indicate that groundwater levels have not or will not rise above the noted depths. The SHWT depth was determined to be approximately 52 inches bgs at the location evaluated. See Figure 2 and 3 for the approximate SHWT test location and Table I for the calculated hydraulic conductivity rates and approximated SHWT depths. Constant Head Permeameter Testing S&ME performed the in -situ hydraulic conductivity (Ksat) testing by utilizing a compact constant head permeameter. S&ME performed two (2) Ksat tests at the hand auger boring location (Figure 2 and 3). l,or the Ksat testing, a hand auger boring was advanced to depths of approximately 22 and 32 inches bgs with a 2 inch diameter auger bucket. A planer auger was used to clean the bottom of the auger holes and give them a cylindrical shape. The water dissipating unit was lowered to the bottom of the holes and water was dispensed from the permeameter. The water was allowed to move through the unit until steady-state flow was achieved and then flow rates were recorded. The last three measurements were averaged to achieve the most representative value to express the saturated hydraulic conductivity. The depth interval of the tests corresponded to a layer of material approximately 5 to 6 inches thick at the selected testing depth. "Fite soils at the test location depths were observed to consist of predominantly sandy loam and light sandy clay loam textures. The hydraulic conductivity rates were calculated as 4.59 inches per Stormwater BMP Soil Testing Hope Mills Bojangles 5&ME Project No. 1351-12-060 May 3, 2012 hour (in/hr) at 22 inches bgs, and 1.26 in/hr at 32 inches bgs. Reference "Rabic l below for the calculated hydraulic conductivity rates and the approximated SI-IWT depth. Table 1: Calculated Hydraulic Conductivity Rates and Approximated SHWT Depths Hope Mills Bojangles - Stormwater BMP Project fTest LocationF Horizon te9ti a�� lic9,' At. SeasonaliHigfiiWafer ��--s��• Table {SFtW7 botow ,e«st k( nctieslbgs) y H Conductiviinlhr}, ;• rn ,w � I IA13 H I - 22" E 17 to 22 4.59 52" HAB # I - 32" Bit 26 to 32 1.26 52" CONCLUSIONS Based on our findings associated with the location evaluated, along with regulatory guidance on requirements for permitting of stornnvater BMP's as provided in the NCDENR, DWQ — Stormwater Best Management Practices Manual (NCDIENR-SW- 13M11), dated July 2007 (revised 2009), BMP's that rely on infiltration for treatment would be suitable within the top 40 inches bgs. However, based on identification of a SHW"f at approximately 52 inches bgs, the bottom of an infiltration device shall be a minimum of 2 feet above the seasonal high water table and should not be installed deeper than 28 inches bgs. 3 Stormwater BMP Soil Testing Hope Mills Bojangles CLOSING S&ME Project No. 1351-12-060 May 3, 2012 S&ME appreciates the opportunity to provide these services to YOU. If YOU have any questions, please contact uS. Sincerely, S&ME, Inc. 4161,ow__a �/2/ l/� Martin Mabe /e�� Rob Willcox, L.S.S. Project Matlager/Agronomist Natural Resources Services Leacler Tables: 'fable l: Calculated Hydraulic Conductivity Rates and Approximated SI-IWT Depths Attachments: Figure 1 — Vicinity Map Figure 2 — Hand Auger Boring and Ksat Location Map Figure 3 — Stormwater 13MP Location Map In -Situ Constant Head Permeameter Calculations Hand Auger Boring Profile Sheet SA158811588 REPORTSIOther Branches1135 - Charlotte\1351 Reports - Charlotte11351-12-060 Hope Mills Bojangles11351-12-060 Hope Mills Bojangles - Stormwater BMP Soil Report.doc 4 Date: 5l 1 /2012 Location: HAB 41 Horizon: P Client: Bojangles' Restaurants, Inc. Project Name: Stormwater Blv[P Project Project #: 1351-12-060 S&ME "TN -SITU" CONSTANT DEAD PERMEAMETER Hole Depth- 1,83 Feet Hole Radius (r): 0.08 Feet Bubble Tube to Surface: 0.25 Feet Reference Tube to Hole Bottom (D): 2.08 Feet Water Depth in Hole (11): 0.50 Feet CIIT Tube(s) Setting (h,): 1.58 Feet Chamber Used:10.11 L Ft'- Ksat = CQ/(2I iH2) Initial Water in Hole: 0.42 Feet Final Water in Hole: 0.42 Feet C = Binh-t (Il/r) - I(r/H)2 + 1]12 + r1H sinh-t = inverse hyperbolic sin of a number H = Height of water in hole (cm) r = radius of hole (cm) Q = Constant Flow Rate (Gal day) = Cross Sectional Area of Resevior s Length of Drop in Water Column over Time Time Drop in Water Column (ft) r = 0.08 ft (ft) (cm) H = 0.42 ft 0-5 min. 0.138 4.20 5-10 min. 0.151 4.60 C = 1.53 10-15 min. 0.246 7.50 Q= 49.00 Gallons/Day 15-20min. 0.210 6.40 20-25 min. 0.210 6.40 25-30 min. 0.210 6.40 30-35 min. 0.210 6.40 35-40 min. 0.210 6.40 Avg, 0.210 Cross Sectional Area = 0.11 ft2 Length of Drop in Water Column — 57.95 ft/day Ksat— 68.59 Gallons/Day/ft2 Inches/flour= 4.585 Note: Ksat calculations are based on average drop in Water Column (ft) after equilibrium is reached. Time (min) _ 5 adjuitabtc atr tube =onsant-trod bow meamrinf �-7"Vdr h2 mh:mwe level H DWERI.SHt,3 unx SA1588\1588 REPORM01her Branches\135-Charloue11351 Reports - Charlottc11351-12-060 Hope Mills Bojanglesl1351-12-060 Hope Mills Bojangies - Storrnwater BMP Soil Report Ksat 5-3-12.As 5/3/2012 S&NIE "IN -SITU" CONSTANT HEAD PERMEAMETER Date: SY112012 Location: HAB 4I Horizon: Btl Client: Bojangles' Restaurants, Inc. Project Name: Stormwater BM11 Project Project#: 1351-12-060 Ksat=CQ!(2Pill ) C = Binh-1 (Hlr) - I(r/H)2 + 1 ]lr + HIR Hole Depth: 2.67 Feet Hole Radius (r): 0.08 Feet Bubble Tube to Surface: 0.25 Feet Reference Tube to hole Bottom (D): 2.92 Feet Water Depth in Hole (11): 0.50 Feet CI IT Tube(s) Setting (ht): 2.42 Feet Chamber Used: 0-11 Ft2 Initial Water in Hole: 0.50 Feet Final Water in Hole: 0.50 Feet sinh-1 = inverse hyperbolic sin of a number H = Height ofwater in hole (cm) r = radius of hole (cm) Q = Constant Flow Rate (Gal/day) = Cross Sectional Area of Resevior x Length of Drop in Water Column over Time Time Drop in Water Column (ft) Time (min) _ r= 0.08 ft (ft) (cm) 5 H = 0.50 ft 0-5 min. 0.129 3.90 5-10 min. 0.072 2.20 C = 1.68 10-15 min. 0.092 2.80 Q = 17.61 Gallons/Day 15 20 min. 0.072 2.20 20-25 min. 0.072 2.20 25-30 min. 0.072 2.20 30-35 min. 0.075 2.30 35-40 min. 0.075 2.30 4045 min. 0.075 2.30 45-50 min. 0.075 2.30 50-55 min. 0.075 2.30 55-60 min. 0.075 2.30 Avg. 0.075 Cross Sectional Area = 0.11 112 Length of Drop in Water Column = 20.83 ft/day Ksat = 18.84 Gallons/W3,/ft2 IncheslHour= 1,259 Note: Ksat calculations are based on average drop in Water Column (fi) after equilibrium is reached. mrsun:-tend - rJ� flow measarn@ ht - rextvtir �x ttfermte to*el sscm / d I -01swt vie: level D ` N DUIRr�E twrra S:\1588\1598 REPORTS5Otber Brmches5135 - Charlone11351 Reports - Charlotte11351-12-060 Hope Mills Bojangles11351-1 ^--060 Hope Mills Bojangles - Stormvater BhIP Soil Report Ksat 5-3-12 xls 513L'01 ^— S& M.E, INC. SITEISOIL .EVALUATION Project No. � 1 35! - IZ -O(oD PhoneNo. r Date: 511 r2 Location J{��E /y), S_ Pin County-: C i/� r-e At-iD Property size 363AAG LrS Proposed Facility: Water Supply: On -Site Well ❑ Evaluation: Auger Boring Community ❑ Pit ❑ Described By: i2DO WILLC0 k,- Public ❑ Cut ❑ Weather: �1,�/,�4T T Antecedent Moisture 57- Surface Water: �'Ifit FACTORS PROFILE 77 PROFILE PROFILE PROFILE Landscape Position'% I Horizon Depth I Color Munsell Id t ,e 418 Texture 15 Structure r Consistence s Y> Boundary Horizon Depth II Color— Munsell fo -5 Texture J Mottles Structure l lvs /[ Consistence 4S y Boundary Horizon Depth III lQ - 5Z —G O Color—Munsell 2, 5 vG Texture ($C Mottles Structure Consistence c 2 Boundary Horizon Depth IV�— Color -- Munsell Z S 6 (a f `Texture S& 1 f SC1 SOexw Mottles _ Structure Pys bX fi VySbL 6-5 I vE Consistence r SS S �r r Boundary Soil Wetness 52 Restrictive Horizon S W j— S 7 r Saprolite 72 el LIAR Classification LEGEND LANDSCAPE POSITION It Itidge ]nterfluve S Shoulder L Lincar Slope S foot Slope N Nose Slope If Head Slope Cc Concave Slope CV Convex Slope T Terrace 1' I-'lood Plain TEXTUI(E s sand Is loamy sand sl sandy loam 1 loam sl silt sil sillloam sicl silty clay loam cl clay loam scl sandy clay loam sc sandy clay sic silty clay c clay C0NSISr1;NC1;1Y1;1' Ns non -sticky Ss slightly sticky S sticky Vs Vcry sticky Np non -plastic Sp slightly plastic 1' plastic Vp t very plastic MOIST Vfr Very friable ti friable fi firm vfi Very firm SI'RUChURI, sg single grain in massive cr crumb gr granular Sall subangular blocky ab " angular blocky p] platy pr prismatic Oaka Q ,yN has H� •' 51) 31k 11A 4p tl25 SIR 1353 - ate" s'p 2320 C1 f jL SITE ,�+=ram .. cat. *Aft (10%d 0 Ln SCALE 1" = 0.5 Mile FIGURE N0. DATE May 2012 #S&ME VICINITY MAP DRAWN BY MEM 1 PROJECT NO WWW.SMEINC.COM HOPE MILLS BOJANGLES 1351-12-060 1 1 HOPE MILLS, NC