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Home My WebLink AboutSW6240102_Soils/Geotechnical Report_20240507 erracon 2108 Capital Drive Wilmington, NC 28405 P (910) 478-9915 North Carolina Registered, F-0869 Terracon.com November 8, 2023 Rhetson Companies, Inc 2075 Juniper Lake Road West End, NC 27376 Attn: Mr. Matt Taggart P: (910) 944-0881 E: matthew@rhetson.com Re: Addendum 1 - Stormwater Management Retail Store Raeford 1299 Fayetteville Road Raeford, North Carolina Terracon Project No. K6235056 Dear Mr. Taggart: We have completed the additional subsurface exploration for seasonal high-water table (SHWT) evaluation and infiltration testing for the above referenced project. Please refer to Terracon Report No. K6235056 dated August 3, 2023 for recommendations regarding geotechnical related aspects of the project. The SHWT determined by the licensed soil scientist was encountered at a depth of 50 inches below the existing ground surface at the test location. Infiltration testing was performed at a depth of 23 inches below the existing ground surface. The infiltration rate at the test location was 3.11 inches per hour. Please refer to the attached Stormwater Soil Evaluation report for additional information. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning this addendum or if we may be of further service, please contact us. Sincerely, Terracon Mir- LiatRey Jritih Denico(a Nicholas R. Lindley, G.I.T. Justin L. DeNicola, P.E. Staff Geologist Office Manager Facilities I Environmental I Geotechnical I Materials Addendum 1 — Stormwater Management Report Retail Store Raeford I Raeford, North Carolina ■ rerracon November 8, 2023 I Terracon Project No. K6235056 Attachments Facilities I Environmental I Geotechnical I Materials Addendum 1 — Stormwater Management Report Retail Store Raeford I Raeford, North Carolina r ierracon November 8, 2023 I Terracon Project No. K6235056 Exploration Plan I . gpKl.`.r•Mr. 1Y'/h_2 GAIN/ 11 y W R. s I MUM IMAM* „!y 4 Apporoximate Exploration Location .4040.44, 2 C.IL 20 - IVCAN.0 corr..: �, %• kr.S I. �, 1r I I: I ::'' Mu.r.rC,Oa •�Wg..2 . x' I I` III — - ----� 11, 1 I I I I �I I 11, , �j L SC_ _ _M 1 I 1 ' II M1N I' ll I n y� ,7,0 l r.a ai,3a�-—-- (711\\H 0- 11 Iram` _ I (_.— I I 1 I I j I \ I =1 � - - i k.I :=3't I 'V131 I-- r ' I II il Li — 1 4 I I I ."r'v! :,tK I I I I I - I - - 1 1 Iis Y ' a I n I J! 11 — �I` ,'•� _ - 0 II - - Q 'AST!.les - US 401(FAYE 1 LEVILLE ROADI °' \♦ / 100 r=_t' ' II II� '3 2023 PAicr� '-.Ddr_ Drpor�ci srll .id'/_;c_I Imagine "h�I". 2023 Twsirorn DIAGRAM IS FOR GENERAL LOCATION ONLY,AND IS NOT INTENDED FOR CONSTRUCTION PURPOSES SITE PLAN PROVIDED BY CLIENT Facilities I Environmental I Geotechnical I Materials Exploration Results Contents: Hand Auger Boring Log Stormwater Soil Evaluations (5 pages) Note: All attachments are one page unless noted above. Facilities I Environmental I Geotechnical I Materials Retail Store-Raeford 1299 Fayetteville Road I Raeford,NC Irerracon Terracon Project No.K6235056 2108 Capital Dr,Ste 103 Boring Log No. SCM-01 HA Wilmington,NC o Location: See Exploration Plan v >O u Latitude: 34.9968°Longitude: -79.2273° @ fl Y N E N (0 co co Depth(Ft.) Elevation: 232(Ft.)+/- Le TOPSOIL, 2-inches 231.8 POORLY GRADED SAND(SP), brown -Color change to tan 3.5 228.5 %1 CLAYEY SAND(SC),trace mica,orange • 5- • • . .6.5 225.5 POORLY GRADED SAND(SP),orange and red }7.8 224.25 LEAN CLAY(CL),trace mica, light gray, pink,and orange 10.0 222 10 Boring Terminated at 10 Feet See Exploration and Testing Procedures for a description of field and laboratory Water Level Observations Drill Rig procedures used and additional data(If any). Groundwater not encountered during augering N/A See Supporting Information for explanation of symbols and abbreviations. Hammer Type N/A Driller Notes Advancement Method N.Lindley Elevation Reference:Approximate elevations obtained using Google Earth Pro Hand Auger Logged by N.Lindley Boring Started Abandonment Method 10-30-2023 Boring backfilled with soil cuttings upon completion. Boring Completed 10-30-2023 Facilities I Environmental I Geotechnical I Materials TERRAIN ENVIRONMENTAL CONSULTING November 3, 2023 Terracon Consultants, Inc. 2108 Capital Drive, Suite 103 Wilmington, NC 28405 Attention: Mr. Justin DeNicola, P.E. Subject: Stormwater Soil Evaluations Project No. 23-055-SS Dollar General Fayetteville Road Raeford, NC Dear Mr. DeNicola: Terrain Environmental Consulting, PLLC (Terrain) appreciates the opportunity to provide you with this report for stormwater soil evaluation services associated with the design of a stormwater control measure (SCM) at the above referenced project site. The results of the testing are presented below. PROJECT BACKGROUND Terrain was contracted by Terracon to perform soil evaluation services, specifically seasonal high water table (SHWT) evaluation and hydraulic conductivity (Ksat) testing, to assist with the future design of an SCM at the above referenced project site. An aerial photograph showing the test location (SCM-1) was provided and the test location was marked in the field prior to our mobilization. Review of the Web Soil Survey showed the area at the test location is mapped with the Lakeland-Urban land complex which is generally described as excessively drained soil formed in sandy marine deposits and eolian sands on low hills with an expected SHWT greater than 80 inches below the ground surface. RESULTS Seasonal High Water Table Evaluation The SHWT evaluation was performed on November 1, 2023 by advancing a hand auger boring at the test location (SCM-1), as shown on the attached Stormwater Soil Evaluation sketch (Figure 1). The hand auger boring was advanced to a depth of approximately 72 inches below the existing ground surface. 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 Terrain Environmental Consulting Project 23-055-SS November 3, 2023 Dollar General Raeford, NC Stormwater Soil Evaluations driven by SHWT fluctuations such as iron reduction and oxidation and organic matter staining. At SCM-1 , soils consisted of medium sand surface and near surface horizons underlain by a sandy loam horizon with slightly sticky consistency. The SHWT was estimated to be at 50 inches below the ground surface. A Soil Profile Description sheet, which provides a description of the observed soil horizons and the estimated SHWT depth, has also been included with this report. Ksat Testing Terrain personnel performed in-situ saturated hydraulic conductivity (Ksat) testing at the test location after the SHWT evaluation was complete. Specifically, the constant- head well permeameter technique (also known as shallow well pump-in technique and bore hole permeameter method) was used. This procedure is described in Methods of Soil Analysis, Part 1., Chapter 29 — Hydraulic Conductivity of Saturated Soils: Field Methods, 29 — 3.2 Shallow Well Pump In Method, pp. 758-763 and in the Soil Science Society of America Journal, Vol. 53, no. 5, Sept. — Oct. 1989, "A Constant-head Permeameter for Measuring Saturated Hydraulic Conductivity of the Vadose Zone" and "Comparison of the Glover Solution with the Simultaneous — Equations Approach for Measuring Hydraulic Conductivity." This method involves allowing a measured volume of water to percolate through the soil until a steady rate of flow is achieved. The steady state rate is used to calculate the Ksat of the soil horizon using the Glover equation. The Ksat test was performed approximately two feet above the SHWT. The Ksat rate was calculated at 3.11 inches per hour. See Table 1 below for a summary of the soil evaluation results. TABLE 1 TEST SHWT OWT Testing Interval Ksat Rate LOCATION (inches below (inches below (inches below (inches per ground the ground ground surface) hour) surface) _ surface) SCM-1 50 inches Not Observed 23 to 29 inches 3.11 in/hr 2 Terrain Environmental Consulting Project 23-055-SS November 3, 2023 Dollar General Raeford, NC Stormwater Soil Evaluations CLOSING We appreciate the opportunity to provide stormwater soil evaluation services. If you have any questions, please do not hesitate to contact me. Sincerely, Ceill/L/14 .-- Paul Masten, LSS, PWS President/Owner Attachments Figure 1 —Stormwater Soil Evaluations Soil Profile Descriptions 3 • Rs- / tom, oc .iti 0 101111°1'0 C1\2;'" IP::�yi•. • _ 11 .1 A. 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Project Number 23-055-SS SOIL PROFILE DESCRIPTIONS Dollar General Fayetteville Road Raeford,NC Location Horizon Depth Matrix Mottles Texture, Structure, Consistence (inches) SCM-1 A 0-8 2.5Y 4/2 Dark grayish brown medium sand, single grain, loose E 8-50 2.5Y 5/4 Light olive brown medium sand, single grain, loose Bt 50-72 10YR 5/6 10YR 5/8 Yellowish brown sandy loam, 5YR 5/6 weak, medium sub-angular blocky, 10YR 7/1 slightly sticky, non-plastic, friable; common yellowish brown to yellowish red redox concentrations and light gray redox depletions Seasonal High Water Table= 50 inches below the existing ground surface. Water table was not observed.