The URL can be used to link to this page

Home My WebLink AboutSW6191004_SW6191004_SOTF_SHWT_memo_20191206_1/22/2020® Stantec To: Ms. Annette Lucas, PE NCDEQ Energy, Mineral and Land Resources — Stormwater Program File: Multipurpose Training Facility, SOTF From: Amber Coleman, LSS, PWS Raleigh, NC Date: December 6, 2019 Memo Reference: Ft. Bragg SOTF Multipurpose Training Facility - Seasonal High Water Table Evaluation Stantec Consulting Services, Inc. provided a seasonal high water table (SHWT) evaluation for two proposed stormwater management infiltration basins at the Fort Bragg SOTF Multipurpose Training Facility project. Fieldwork was completed on November 7, 2019 by Amber Coleman, LSS, PWS. The project area is located within the Sandhills ecoregion in Cumberland County, North Carolina. Soils mapped by USDA-NRCS in the project area include Wagram loamy sand. Wagram is a well drained soil on broad, smooth flats and side slopes of uplands (USDA-NRCS 1984 Soil Survey of Cumberland and Hoke Counties North Carolina). The soil map unit is within hydrologic soil group A which consist of deep, well drained to excessively drained sands and have a high rate of water transmission. (USDA-NRCS Web Soil Survey - Cumberland County, NC, Version 19, September 2018). Site vegetation predominantly consisted of longleaf pine, loblolly pine, turkey oak and wiregrass. The SHWT elevation was determined using soil profile evaluations observed by hand auger. Three test locations were completed, Site 1 was within stormwater management infiltration basin #1 (SWM #1) and Sites 2-1 and 2-2 were within SWM #2. Site 2-2 includes depth to seasonal high water table features only. Table 1. Soil Profile Descriptions Soil Description Summary SHWT Depth from Soil Sample Location Horizon Depth Description Redox Surface Site in Features 1 SWM #1 A 0-5 10YR 3/3 sandy loam Beyond sample depth B1 5-22 10YR 5/4 loamy sand B2 22-40 10YR 5/6 sandy loam B3 40-60 10YR 5/8 sandy loam Bt 60-72 7.5YR 6/8 sandy clay loam BC 72-93 7.5YR 6/8 sandy loam Northing: 516051.83ft N, Eastin : 1976903.28ft E NC State Plane 1983 2-1 SWM #2 A 0-4 10YR 3/2 loamy sand 72" north end B1 4-40 10YR 5/4 loamy sand B2 40-52 10YR 4/6 sandy loam B3 52-64 7.5YR 4/6 sandy loam C1 64-72 10YR 6/8 loamy sand C2 72-84 10YR 5/6 loamy sand 7.5YR 4/6 Northing: 516172.98ft N, Eastin : 1977280.57ft E NC State Plane 1983 2-2 SWM #2 64-66 10YR 5/6 loamy sand 7.5YR 4/6 64" south end Northing: 516088.04ft N, Eastin : 1977316.13ft E NC State Plane 1983 Design with community in mind December 6, 2019 Ms. Annette Lucas, PE Page 2 of 2 Reference: Ft. Bragg SOTF Multipurpose Training Facility - Seasonal High Water Table Evaluation Exhibit 1. Soil Sample Locations 8' DIP - i INLET PROTECTION T ��\ wa 12" RCP\ ry f rV RATION TRENCH VERFLOW DETAIL SEDIMENT FENCE p. rROL NOTES: ENTIRE LIMITS OF DLSTURBANCEJ TO MAINTAIN STOCKPILES. B' DIP- LL i112 RIP RAP OUTLET i3 PROTECTION-A7 2 J-HOOK DETAIL ROAr 1.5'RCP 15•RCP - CLASS IV rl� FPt = 23300 SEE GRADING `\ , NOTE 2 ON `-- SHEET CG102 v� R. 335 f 3 INLET PROTECTION 6 INFILTRATION TRENCH CG10/iG5M SWM P2 16'RiFP-. CLATV SD \ SEE CONS SEQUENCE „ C' \ NOTE4. DETAIL 4 ON SHEET C-SW I 2-1 2 CG101 C-W4 RIP 101 P - G503 PROTECTION 82 S ,z� > �/ 2 J-HOOK DETAIL CG GG101ICd04 LOG-Y 0 n. 2 J-HOOK DETAILti� A `tib 3 SEDIMENT FENCE OUTLET 03701:CSe ry�t v 'vF CG101iW1 (TYPICAL OF 8) a „y i SEDIMENT AND EROSION CONTROL PLAN 101 SCALE 1'=30'4 (Background map from Fort Bragg, NC PN 95396, Multipurpose Training Facility — Sediment and Erosion Control Plan 2019) Site 1 was sampled to a depth of 93" and no evidence of a seasonal high water table was observed. Site 2-1 was sampled to a depth of 84" and mottling in the form of redoximorphic features indicative of a SHWT was evident at 72" below the soil surface. Site 2-2 was dug to 66" and the SHWT was observed to be at 64" below the soil surface. Stantec Consulting Services Inc. y F Amber Coleman, LSS, PWS Senior Scientist Phone: 919 865 7399 Fax: 919 851 7024/ amber.coleman@stantec.com i Attachment: Field Data Forms�;;� r s Design with community in mind SOIL PROFILE DESCRIPTION FORM PROFILE ID: ► NAME: f C a L Vi - C DATE: PROJECT NUMBER/NAME: 1 $4 S i 7,3 2. - S 071 F-z LOCATION: SVVMlf�- I *,(o O5-D .g0 iJ [ 9`7 89 al 0 33 G WEATHER: S -7 0 ` F LANDSCAPE POSITION: kU v a SLOPE (%): S -1 VEGETATION/CROP: t a DEPTH TO WATER: Yl A DEPTH TO ROCK/BEDROCK:v� FLOODING CHARACTERISTICS: Y10 n �- DEPTH TO MOTTLES: h D f- DEPTH TO CH [ 2 MATRIX: _ ROOT RESTRICTING DEPTH• h A A a OUTCROPS (%): h o At n0('l-e- OTHER NOTES: 4nr) too" el o cs w. I S S 0r` - r e (ll + v,i I F1A_Ht el irJ c, .t G4.iA HORIZON DEPTH (inches) 0-5 S- 2 Z 22 ' �40 Ho- ip0 �aD" 1� '7 a- 9 3 MATRIX COLOR 10 l !Z 3l/ 3 D 5 1 Y IZ 0� ( � r! , S( rl 8 7•� Y� S TEXTURE c5 LS �- S L S L S` L S L REDOX COLOR REDOX Type / % STRUCTURE (� W 2 6C l .4-1IW ChAj"e. k& r 1 +o 66Secvt , w� r CONSISTENCE ROOTS CLAY FILMS BOUNDARY OTHER SOIL PROFILE DESCRIPTION FORM PROFILE ID: — NAME: Q V 1 v DATE: I I - 7- Iq PROJECT NUMBER/NAME: I S4 FD 3 - 5 o L F LOCATION: �W M J - ' PAJ WEATHER: S U ^'I I D F LANDSCAPE POSITION: C(e I'll �r Q. SLOPE (%): VEGETATION/CROP: 1, 61 i e Gl k-" o o -k DEPTH TO WATER: 6f_ yvl We, DEPTH TO ROCK/BEDROCK: pi inel e_ FLOODING CHARACTERISTICS: h () ne, f/ DEPTH TO MOTTLES: —DEPTH TO CH [ 2 MATRIX: ROOT RESTRICTING DEPTH: )'10 f)i' OUTCROPS (%): n OTHER NOTES: 5 0 W �/ d-!e V'M (v �" ho G' 4 7 "r- HORIZON ^ 12 �3 C , G DEPTH (inches) b "� �� - 40 �f 0 SZ 5-2 - (o y 6o q 7 2 MATRIX COLOR lOyP- (v TEXTURE REDOX COLOR REDOX Type / % STRUCTURE e, a_ k 4-o o h 5 er ' Q- v� cu CONSISTENCE ROOTS CLAY FILMS BOUNDARY OTHER V e �1 5 GL f v�� v� c� Vvk 2 L S 5 t'