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Home My WebLink AboutSW6210101_Grays Creek Storage soilrpt_20210330 Southeastern Soil & Environmental Associates, Inc. RO. Box 9321 Fayetteville, NG 28311 Phone/Fax(910) 822-4540 Efmill rnikbq@soLitheasterrisoii.com October 30, 2020 Mr. Scott Brown, PE 4D Site, Solutions, Inc. 409 Chicago Drive, Suite H 2 Fayetteville, NC 28306 Re: Hydraulic conductivity (permeability) analysis & Seasonal High-Water Table determination (SHWT) for proposed storrilwatef treatment/retention area, Grays Creek Storage Facility, Sand Hill Road, Cumberland County, North Carolina Dear Mr. Brown, An evaluation of soil properties and hydraulic conductivity (Ksat) has been conducted at your request on the aforementioned property. The purpose of the investigation was to determine soil water table depths (SHWT) based on soil profiles. In addition, Ksat was to be provided at varying depths for use with stormwater retention basin design. Saturated hydraulic conductivity of the unsaturated zone was measured in, a similar method as described in the Soil Science Society of America Journal, Vol. 53, no 5, Sept. - Oct. 1989, "A Constant Permeameter for Measuring Saturated Hydraulic Conductivity of the Vadore Zone" and Comparison of the Glover Solution with the Simultaneous Fq U af In ns Approach fb r Measuring Fly draul i c Conductivity." This consists of advancing a small diameter bore hole to a predetermined depth. At this depth, a constant head (pressure) was established and maintained. Flow measurements were made at timed intervals after flow stabilized. Soils at the proposed basin site are most similar to the Autryville soil series (see attached boring logs). Two borings were advanced to 8.5 or more feet below the ground surface. Seasonal High-Water Table (SHWT) as determined by evidence of colors of chroma 2 or less (and/or concentrations of high redox mottles) was encountered at depths of 86 and 89 inches below the ground surface. No water was observed in either boring on the day of testing. SOIL/SITE EVA4.UA110N -SOIL PHYSICALANALYSYS-LAND USE/SUBDIV00N PLAMM-WETLANDS GROUN[)WATER DRAIN AGE/MOUNUNG-SURFACE/St J BSU R FACE WASTE TREATMENT SYSTEMS, EVALIJAT4ON& DESkGN Two compact constant head permeameter(CCHP) tests were conducted at a depth of 24 inches above SHWT levels. The measured Ksat rates were 0.83 cm/hr and 1.69 cm/hr (equivalent to 0.33 inches/,hour and 0.67 inches per hour). The attached map shows locations of the sample points as well as Ksat location. It should be noted that the reported SHWT does not necessarily reflect the elevation of static groundwater (due to variations in groundwater recharge rates, annual rainfall, drought conditions, etc.). Reported water levels are simply a measurement on the day of analysis. The data presented in this report are limited by a number of considerations. The primary consideration is that soil formations can be highly variable. The soils found on this site can be subject to inclusions of other soil types, perched water, artesian conditions and/or layers of undulating low permeability clay scams. These and other soil conditions can have an effect on the steady state of groundwater flow. To the extent possible, we have identified the soil types that will impact the flow of groundwater, and have provided a professional opinion as to the depth of SHWT. I trust this is the information you require at this time, Sincerely, moll� AV SOIL So Mike Eaker NC Licensed Soil Scientist#1030 w7-1- D, G 'Oo S A ep AN A6 1030 AK"C ....................................................................................................................................................................."I'l""I'll""I',,',,"",',,""I',,",,I............... ............... ............... ............... ............... Southeastern Soil & Environmental Associates, Inc. RTC. Box 9321 Fayettevle, NC 28311 Phone/Fax(910)822-4640 Email mikeftouffieasternsoiLcom SHWT depths, Grays Creek Storage Facility, Sand Hill Road, Cumberland County, NC B01UNG SHWT DEP JH Linchesl Qbserveq_M�g i>�e a s BI 86 None B2 89 None SOU,SITE EVALUAT ION -SUL PHYSICAL ANALYSIS-LAND USE/SlUBDIVISION PLANNWG-WETLANDS GROUNDWATER DRAINAGEWOUNDING®SLJRF ACE/SU BSU R FACE WAS,TE T"REAVIVIENT SYSTEM S, EVALUATION& DESIGN Southeastern Soil & Environmental Associates, Inc. RO, Box 9321 Faye tteviRe, NC 28311 Phone/Fax(910)822-4540 Ernaff mke@soWheasternsoH.corn Measured Ksat Rates, Grays Creek Storage Facility, Sand Hill Road, Cumberland County, NC Ksat Ksat Location Depth (in) cm/hr in/hr 131 62 0.83 0.33 B2 65 1.69 0.66 SC;ii-/53i'TE EVALUi-Vf-ON -SOl L PHYSICAL ANALYS6-LAND USE/SUBDWiSON PLANNING-WETLANDS GROUNDWATER DRAINAGEIMOUNUNG-SLJRFACF/SLJBSUnFAGE WASTE TREATMENT SYSTEMS, EVALUATION&DESIGI� Southeastern Soil & Environmental Associates, Inc. P-0, Box 9321 Fayettavdie, NC 28311 Phwe/Fax(910) 822-4540 Ernad rnke@southeasternsofl.corn Soil Boring Log(BI), Grays Creek Storage Facility, Sand Hill Road, Cumberland County,NC This map unit consists of well drained soils that fori-ned in loamy sediments on uplands. Slopes range from 0 to I pet-cent. A- 0 to I I inches; dark olive brown (2,5Y 3/3) loamy sand; weak fine granular structure; very fTiable-, common fine and medium roots; abrupt smooth boundary, E - 11 to 33 inches; olive yellow (2.5Y 6/6) loamy sand; weak medium granular structure; very friable; few fine roots; clear smooth boundary, Bt- 33 to 41 inches; yellowish brown (I OYR 5/8) sandy loam; weak fine subangular blocky structure; very friable; gradual wavy boundary. E* - 41 to 59 inches; brownish yellow(I OYR 6/6) sand; single grained; loose; cornnion medium pockets of clean sand grains; gradual wavy boundary. B 7t - 59 to 63 inches; yellowish brown (I OYR 5/8) sandy loam to light sandy clay loam; weak fine subangular blocky structure; friable to Firm; gradual diffiu,';e boundary- CD BC - 63 to 86 inches; light yellowish brown (2.5Y 6/4) sandy clay loam; many medium prominent light yellowish brown (1,OYR 5/8)mottles; firm; massive structure; gradual wavy boundary. C - 86 to 102 inches; mixed mottled strong brown (7.5YR 5/8), yellowish brown (I OYR 5/8) and light gray (10YR 7/1) sandy clay loan; firm; massive structure. SHWT Ca) 86 inches (I OYR 7/1) SOIUSITE CVALUATON -SO L PHYMALANALYSIS- LAND USEDSUBDNOON PLANNING-WETLANDS GROUNDW91'ER DRANAGEMAOUNDHNG-SURFACEJSUr3SUR FACE WASTE TREATMENT SYSTEMS, EVALLJATK,ON&DE&G14 .......................................................................- Southeastern Soil & Envi"ron mental Associates, Inc. 1--1.0. Box 9321 Fayette011e, NC 28311 Phone/Fax (910) 822-4540 Email mike @somtneasternsoiLoorn Soil Boring Log '( ), Grays Creek Storage Facility, Sand Hill Road, Cumberland County,NC 'T'his map unit consists of well drained soils that formed in loamy sediments on uplands. Slopes range from 0 to I percent. A - 0 to 8 inches; dark olive brown (2.5Y 3/3) loamy sand; weak fine granular structure; very friable; common fine and medium roots; abrupt smooth boundary. E - 8 to 30 inches; olive yellow (2.5Y 6/6) loamy sand; weak medium granular structure; very friable; few fine roots; clear smooth boundary. lit- 30 to 43 inches; yellowish brown (I OYR 5/8) sandy loam; weak fine subangular blocky structure; very friable; gradual wavy boundary. E' - 43 to 59 inches; brownish yellow(I OYR 6/6) sand; single grained; loose; common medium pockets of clean sand grains-, gradual wavy boundary. 13't- 59 to 75 inches; yellowish brown (I OYR 518) sandy loam to light sandy clay loam; weak fine subangular blocky structure; friable to firm; gradual diffuse boundary. BC - 75 to 89 inches,; light yellowish brown (2.5Y 6/4) sandy clay loam; many medium prominent light yellowish brown (I OYR 5/8) mottles; firm; massive structure; gradual wavy boundary. C - 89 to 102 inches; mixed mottled strong brown (7.5YR 5/8), yellowish brown (I OYR 5/8), red (2.5YR 4/8) and light gray (I OYR 7/1) sandy clay loam; firm; massive structure. SHWT (q), 89 inches (I OYR 7/1) SOILISITE EVALUATlON -,SOIL PHYSlCALANALY&S-LAND USE/SUBIDWISION PLANNING-WETLANDS GROUNDWATER DRAI NAG E/MOUN DING o SURFACE/SUBSURFACE WASTE TREATME NTSY STEMS, EVALuxnON&DESIGN it 21 112 pq' il 1111, i 0 a 1 1, ; 1vhwii::!vI:tiiiii pssm - cv! P.O. Fax 9321 twzaasoaa hone/Fax � 10 2.-4540 Finai mike@s easternsoil.c 1 N43000.. _ i Soil ri t Location, Grays Creekt r Sand Hill Road, Fayetteville, LDS State Plane 1983 Scale 1:2,000 KIDD.SSF North Carolina 3200 NAD 1983(Conus) N 0 250.0 1 012 912 020 iSIi1oY' l4�d$G fir'{ PS PathfinderoOffice Feet 11 .. SOM SITE EVALljXj'ION ML F'{-&'XSIGALANALYSIS- LAND USlmmMSC3WBSBON Pl_AWNG,-WE-l- AIDS GROUNDWATER DRAINA,CIwMJ4JI"+d iNG-Sl_RFAC EJSU BSURFACE WASTE T RI~AT ENT SYSTEMS, 'EVALLII`,T ON &. DESlC1\I