Loading...
HomeMy WebLinkAboutWQ0033455_Regional Office Physical File Scan Up To 11/23/2020Michael F. Easley Governor William G. Ross, Jr., Secretary North Carolina Department of Environment and Natural Resources Coleen H. Sullins, Director Division of Water Quality Asheville Regional Office Aquifer Protection Section, 2090 U. S. Highway 70, Swannanoa, N.C. 28778 Telephone: 828/296-4500 Customer Service Fax: 828/299-7043 1-877-623-6748 AQUIFER PROTECTION SECTION December 29, 2007 Nathaniel Thornburg NCDENR Aquifer Protection Section 2728 Capital Boulevard Raleigh, NC 27604 RE: Application No. WQ0033455 Additional Information Request #2 The Cliffs at High Carolina Wastewater Treatment and Drip Irrigation System Nathaniel, A field review of the Cliffs at High Carolina project in Buncombe County was held on Monday December 15, 2008. Rick Wooten (NC Geologic Survey), Brett Laverty (Aquifer Protection Section), Mark Brooks (Brooks Engineering), Walker Ferguson (Brooks Engineering), and Walker Birdsong (S&ME, INC) were in attendance. Our purpose was to review select drip irrigation zones on the east side of the project that represent a potential landslide hazard. The irrigation zones assessed can be found within the boundaries of study areas L, M, and N. Prior to our field review, Factor of Safety Calculations for the stability of infinite slopes with seepage was computed by S&ME, INC. for select irrigation zones in study areas A, F, L, and N. Although the infinite slope equation was touted as “simplified” and “conservative”, the average values of 33 degrees for the friction angle and the assumed 100 psf for cohesion used in the calculations may not be conservative. It is not unreasonable that the actual soil friction angles and cohesion values may be somewhat lower in some areas, and thus lead to lower factors of safety. It was recommended that a safety factor greater than 1.2 would be suitable for this project. Irrigation zones within study area N were the only areas to have safety factors below 1.2, which indicates potential instability under fully saturated conditions. Rick Wooten and I are in general agreement that areas L & M on the east-side of the project pose a low-risk for slope mobility based on our field review and the Factor of Safety Calculations provided by S&ME. I also recommend that all other areas except study area N have met the conditions established for issue 1 as stated in the additional information request letter of December 4, 2008. Irrigation zones within study area N have not met conditions established for issue 1 and therefore should not be considered for the phase 1 drip irrigation permit. Furthermore, field observations indicate the need for a more detailed geotechnical analysis as outlined in the conditions established for issue 2. Supporting evidence for further action within study area N includes the following: • Anticipated irrigation rates within study area N is greater than 52,000 gallons per day, which is the highest application rate across the entire project (Hydrogeological Assessment Report; Table 2) • Slopes within study area N are often greater than 38% and have safety factors below 1.2. Regional slope stability statistics compiled by the North Carolina Geologic Survey show some landslide potential in slopes between 27% and 36%, whereas a bigger jump in landslide numbers occurs on slopes between 36% and 47%. • NC Geologic Survey slope stability mapping has identified study area N as lower to upper threshold unstable and even highly unstable in select areas (see attached map). • LIDAR mapping has identified past landslide deposits within the study area drainage (see attached map). • Colluvium is the “primary material of concern for landslides”. It is present throughout study area N and in some cases directly underlain by highly fractured bedrock. • Rick Wooten identified some of the underlying bedrock as Tonalite, which is an igneous rock often associated with slide prone areas in this region. • Shallow hillside depressions or “slide trigger areas” were observed within study area N. • Numerous curved and bent trees indicating slope movement. I understand that we may be covering new ground in asking for a detailed analysis of drip irrigation fields and the instability of natural slopes. I am not sure that I fully understand all of the factors that must be considered in such an investigation. Regardless, it is an issue the Asheville Regional Office must consider in these high mountain communities. I do not know what the time frame will be for the phase II drip irrigation field but I would like to encourage the Cliffs at High Carolina to partner with APS and the Geologic Survey to resolve this issue. The more we understand about this issue the more efficient we will be at handling future express review projects. Sincerely, Brett Laverty Hydrogeologist II Approximate location Study Area N • 4pk„ Explanation Cliffs Roads Landslide Deposits Slope Stability Unstable .. t � Upper Threshold �'�.. f r nLower Threshold n Nominally-Stablek� !..7 Moderately Stable -� #R . � '-1 35 000 iStable u+' >AChrys4 _On . F 0 '0.'25 0.5 0.75 1 1 Miles �• ,�r Created: October 30, 2008 Cele r li g 35 Years 1973 2008 December 12, 2008 The Cliffs Communities 3598 Highway 11 Travelers Rest, South Carolina 29690 Attention: Mr. Donald H. Nickell, Jr., P.E. Reference: DRIP FIELD EVALUATION The Cliffs at High Carolina Swannanoa, North Carolina S&ME Project No. 1261-08-592 Ladies and Gentlemen: This report is prepared to provide information in regard to a letter and attachments from the Division of Water Quality dated December 4, 2008. It presents our findings and geotechnical opinions regarding the effect the proposed drip fields at The Cliffs at High Carolina will have on the stability of the terrain. Supporting data and calculations are attached. This work was done in accordance with our proposal no. 08903. From review of the letter from the Division of Water Quality, we understand there is concern the proposed drip field areas are overlain by colluvial soils. When these soils become saturated from the drip irrigation lines and rainfall, there is concern landslides could occur. We previously evaluated the proposed drip field areas and presented our opinions in a letter dated November 14, 2008. This report supplements and supersedes that letter. PROJECTION INFORMATION We have discussed the project with Messrs. Walter Ferguson, LSS and Mark Brooks, P.E. with Brooks Engineering Associates (BEA). Also, we have reviewed a topographic site plan showing the drip field zones prepared by BEA. We understand the drip lines will be laid on the ground with minimal disturbance of existing vegetation. Up to 2 inches per week or about 100 inches per year of water could be irrigated on the zones. This water is to be periodically and gradually released, and be absorbed in the ground and evaporate. S&ME, INC. / 301 Zima Park Drive / Spartanburg, SC 29301 / p 864,574.2360 1864.576.8730 One Marcus Drive, Suite 301 / Greenville, SC 29615 /p 864-232-8987 / www.smeinc.com Drip Field Evaluation S&ME Project No. 1261-08-592 The Cliffs at High Carolina, Swannanoa, North Carolina December 12, 2008 It is our understanding 32 zones are to be used for the drip field irrigation. These zones are numbered 1 through 34, with 4 and 11 omitted. Based on our measurements from the topographic plan, the existing ground inclinations vary from about 13 percent (about 8 horizontal to 1 vertical) to 55 percent (1.8 H to 1V). The steepest zones are 30, 31, 33 and 34. These four zones are steeper than about 38 percent. A tabulation of the ground inclinations of the zones is attached. EVALUATION WORK Our work included reviewing subsurface data from borings and test pits made in the area and furnished to us by BEA. Also, we reviewed laboratory triaxial shear test data from relatively undisturbed soil samples obtained from roadway work in,the area. (The results of the laboratory analysis are attached.) In addition, a visual site reconnaissance was made. The attachments with the letter from the Division of Water Quality included a Factor of Safety Calculation for the stability of infinite slopes with seepage. We have used this calculation to compute factors of safety for the inclinations of the different zones. These calculations were done both by computer spread sheets and by hand, and are attached. ANALYSIS The Factor of Safety Calculation incorporates the inclination of the existing ground surface, the thickness of the colluvium (or assumed sliding layer), the saturated soil unit weight, and strength properties of the soil — cohesion and angle of internal friction. Basically, the equation, which is shown on the attached calculations, is based on the saturated weight of soil forcing the soil mass to slide down the slope. This driving force is resisted by the soil's cohesion, and friction resistance which is calculated by multiplying the submerged soil's unit weight times the tangent of the soil's internal friction angle. The infinite slope calculation is simplified and a generally conservative approach to evaluate the factor of safety of slopes. The equation does not account for any end resistance. The calculation assumes the groundwater level rises to the ground surface, which would not occur in the area of these zones. Also, the diagram with the equation shows some of the force being resisted by tree roots. While tree roots will provide some resistance, this was not considered in our calculations. Based on previous laboratory testing of relatively intact soil samples taken from nearby roadway construction in colluvial soils and our observation of cut slopes in colluvial soils, we have estimated soil parameters. (Our laboratory tests were performed with the soil being saturated.) This information indicates a saturated soil unit weight of about 108 pcf, a cohesion of 100 psf and an angle of internal friction of 33 degrees. (A higher unit weight was used in some of the calculations for comparison.) While most of the laboratory testing shows the cohesion to be low to near zero, it is our opinion a value of 100 psf is suitable for undisturbed colluvial soil. The colluvial soils typically contain 2 Drip Field Evaluation S&ME Project No. 1261-08-592 The Cliffs at High Carolina, Swannanoa, North Carolina December 12, 2008 some silt and clay. Also, observation of actual performance of cut slopes in colluvium indicates the presence of significant cohesion. Based on the furnished boring data taken from this area and our experience, the level of rock varies from the ground surface to about 100 feet, and deeper. Rock is overlain by residual soils that have a moderately high to very high consistency. In some areas these residual soils are in turn overlain by colluvium. Using experience, we agree with the Division of Water Quality letter in that the colluvium is the primary material of concern for landslides. Residual soils would typically not be expected to undergo slope failure unless altered by grading. As such, the colluvium and an idealized interface with the residual soils or rock were used in the calculations. In reality, there is typically a transition from residual soil to rock. Colluvium can be present directly over rock, but is more commonly found as a surface layer overlying residual soil. The actual depth of colluvium is difficult to determine from borings and even test pits. Based on the furnished data and our observations, we have used a depth of 6 feet. RESULTS We performed hand and computer analyses for the different zones and ground inclinations. The calculations indicate the following safety factors: H:V DEGREES 20 5:1 11.3 2.2 25 4:1 14 1.8 33 3:1 18.4 1.4 36 2.75:1 19.9 1.3 40 2.5:1 21.8 1.1 50 2:1 26.6 0.9 For these conditions, a safety factor on the order of 1.2 to 1.3 would be considered suitable. This appears to be a conservative consideration for the calculations used. These soils have undergone very heavy and prolonged precipitation many times, notably when the remnants of Hurricanes Francis and Ivan passed through the area in 2004. These soils have been saturated and then received significantly more rainfall. In this regard, the safety factors calculated above appear reasonable. 3 Drip Field Evaluation S&ME Project No. 1261-08-592 The Cliffs at High Carolina, Swannanoa, North Carolina December 12, 2008 OPINIONS Based on the calculation results and our experience, all of the zones have a suitable factor of safety against landslides, except Zones 30, 31, 33 and 34. These zones have calculated ground inclinations of 38% (2.6:1), 42% (2.4:1), 47% (2.1:1) and 55% (1.8), respectively. If these zones, particularly 30 and 31, have shallower colluvium or no colluvium, they could also be suitable. It is our opinion that, in general, zones with a ground slope of about 33 percent and flatter should remain stable with the proposed drip fields. Zones in areas with steeper terrain should be more closely evaluated on a case by case basis. This would require exploration and analysis of the actual subsurface conditions in the specific zone. LIMITATIONS OF REPORT This report has been prepared in accordance with generally accepted geotechnical engineering practice for specific application to this project. The findings and opinions in this report are based on the applicable standards of our practice in this geographic area at the time this report was prepared. No other warranty, express or implied, is made. This report is intended to be used by The Cliffs Communities only in regard to landslide potential in the proposed drip fields. CLOSURE We appreciate the opportunity to work with The Cliffs Communities. Should any questions arise regarding the information in this report, please contact us. Sincerely, S&ME, Inc. alk-r :'rdsorig, Senior Engineer ��1»�urlt ,••t , CAP ",, • 3 • SEAL 9379 • 14 0 $Ot' rr1 z/08 WB/DG S:\GEOTECH\2008\6108592 r tiffs - High Carolina Drip FieldReportdoc Daniel McGough, F.E. Project Engineer cc: Mr. Walker Ferguson, LSS — Brooks Engineering Associates 4 DRIP FIELD ZONE INCLINATIONS THE CLIFFS AT HIGH CAROLINA SWANNANOA, NORTH CAROLINA 1261-08-592 1 32' 100' 32 3.1:1 2 47' 155' 30 3.3:1 3 48' 203' 24 4.2:1 5 56' 216' 26 3.9:1 6 32' 120' 27 3.8:1 7 50' 280' 18 5.6:1 8 34' 168' 20 4.9:1 9 16' 62' 26 3.9:1 10 12' 50' 24 4.2:1 12 42' 220' 19 5.2:1 13 36' 170' 21 4.7:1 14 20' 156' 13 7.8:1 15 50' 246' 20 4.9:1 16 54' 258' 21 4.8:1 17 24' 209' 11 8.7:1 18 16' 62' 26 3.9:1 19 50' 210' 24 4.2:1 20 16' 93' 17 5.8:1 21 24' 103' 23 4.3:1 22 40' 140' 29 3.5:1 23 32' 120' 27 3.8:1 24 38' 144' 26 3.8:1 25 40' 130' 31 3.3:1 26 50' 171' 29 3.4:1 27 26' 85' 31 3.3:1 28 32' 119' 27 3.7:1 29 38' 150' 25 3.9:1 30 110' 288' 38 2.6:1 31 150' 354' 42 2.4:1 32 74' 250' 30 3.4:1 33 170' 365' 47 2.1:1 34 110' 200' 55 1.8:1 JOB NAME SUBJECT /I/) 1,1,e S&ME 25 (I) Ae5s'ael 691::' -574'14/47: o 116t V luivi 71-11-16:41(:ftg4) 2et„.1 deqc e Fiwn 6,47w 54/, t401 / 5- I: /0erCf fT <33 5/9-,2e /bey" y OP 242,704 6 (2,614 2-47 ) A / /4/ /&e.rP'7,_ • 6.(tO 095'6? + &.-?-.) FY 60%$/or4 ( 1/. /15 / (2 , a/Fo - 0,50 0,36? -4- (, 3433333, COMPUTED BY JOB NO ///eW 4(' :}1/4 SHEET NO NO DATE CHECKED BY (.3 0(7" ./,`/C 336'l '331 333,3 /S3'443 1 77-7 6) „5?---YeM001 4263 C), 61.33 s S&ME JOB NAME SUBJECT 7-o-y- ‘-r 0,4/0 0 , . 0 ‘'9 f For 3(p, 'VA 25// /V" ) COMPUTED BY JOB NO SHEET NO DATE CHECKED BY '//e° /7c) , 66 /=, , ./C3 o - 6 2, LI •P ebS , :1°5 6-, Infinite Slope Analysis yytan 0 FS = ys„, T COS 2 # tan /3 ys„, tan p Input Parameters gsai (pcf) gw (pcf) F (deg.) c (psf) b (deg.) T (ft) = 108 = 62.4 = 33 = 100 = 17.7 = 6 Calculated Factor of Safety FS = 1.39 Zone 1 Assume groundwater has risen to the ground surface Stabffity of Infinite Slopes with We, 0 Soil Properties Friction Angle, Cohesion, c Unit Weight, y Sat. Unit Weight, y4,11 Factor of Safety Calculation (FS) isaryw tang FSs -?sat T cos2fS tanii *AM tanli To. Soil Thickness Dw = On* of Groundwater yw = Unit Weight of Water h Car Vegetation Root Cohesion Root Anchoring Evapotranspiration Geo vey Infinite Slope Analysis Input Parameters g„, (pcf) = 108 g, (pcf) = 62.4 F (deg.) = 33 c (psf) = 100 b (deg.) = 13.5 T (ft) = Calculated Factor of Safety FS = 1.82 Zone 3 Assume groundwater has risen to the ground surface bility of Infinite Slopes with Sepa Soil Properties Frktion Angie, Cohesion, c Unit Weight y Sat Unit Weight. ysei igure Pr Factor of Sal c FSs- T cosni SWIThickness Ow= Depth of Groundwater Unit Weight of Water id by h Car Calculation + Yam." ?sat Vegetation Root Cohesion Root Anchoring Evapotranspiration vey Infinite Siope Analysis FS = c ys„,T COS 2 la tan nu, 7„, tan 0 y.„„ tan # Input Parameters gsat(Pcf) = 108 gw (pcf) = 62.4 F (deg.) = 33 c (psf) = 100 b (deg.) = 10.8 T (ft) =6 Calculated Factor of Safety Zone 12 Assume groundwater has risen to the ground surface FS = 2.28 Stability of Infinite Slopes with Sepage Angle. 0 Solt Properties Friction Angle, Cohesion. c Unit Weight t. Unit Weight. .1"= SoliThickness Etet = Depth of Groundwater = Unit Weight of Water 4gure Pr "ded by Vegetation Root Cohesion Awl Anchoring Evapotranspiration h Car • Geo vey Infinite Slope Analysis FS = cos' 13 tan -7 tan 0 tan io Input Parameters gsat (pcf) g, (pcf) F (deg.) c (psf) b (deg.) T (ft) = 108 = 62.4 = 33 = 100 . 16.2 = 6 Calculated Factor of Safety FS = 1.52 Zone 22 Assume groundwater has risen to the ground surface Way of infinite Slopes with Seepag angle,D Soli Properties Friction Angle, Cohesion. c Unit Weight, 'y Sat Unit Weight,y Factor of Satety Calculation (ES) ysary,,y tan FSs"issi T cos2I1 imp ysat tanli T= Soil Thickness Ow = Depth of Groundwater = Unit Weight of Water ure Fro ded by h Car Vegetation Root Cohesion Root Anchoring Evapotranspiration vey Infinite Slope Analysis FS = ry,„ tan 0 r.„„T cos' fltanfl 7„ tan fi Input Parameters gnat (pcf) 9w (pcf) F (deg.) c (psf) b (deg.) T (ft) = 108 = 62.4 = 33 = 100 = 20.8 = 6 Calculated Factor of Safety FS = 1.19 Zone 30 Assume groundwater has risen to the ground surface lity of Infinite Siopes wfth Seepage Angie, It Soli Properties Friction Angle, 0 Cohesion, c Unit Weight y t, Unit Weight, y‘,„I T= $OH Mk:Wien Dw = Depth of Groundwater Unit Weight of Water Factor ot Safety Calculation(FS) c -Alaryw tand FSs ?sat T cosli tan p tanii Vegetation Root Cohesion Root Anchoring Euapiranspiration Figure Prs d by Car 'Geo iSvey Infinite Siope Analysis c. y,„ FS = — y„. tan 0 y„T cos 2 /3 tan fi ys„, tan /3 Input Parameters gsat (Pe) = 108 g, (pcf) = 62.4 F (deg.) = 33 c (psf) = 100 b (deg.) = 22.8 T (ft) = 6 Calculated Factor of Safety FS = 1.08 Zone 31 Assume groundwater has risen to the ground surface Stability of Infinite Slopes with Angle. 11 sou Properties Friction Angle, (0 Factor of Safety Calculation (FSs) Cohesion, c Unit Weight 1 FSs c yset--is,v time T tan (at tanli Sat Unit Weight, litaai 1-= Soli Thickness OW= Depth of Groundwater Unit Weight of Water lZigure Pro ded by Root Cotittekin fleet Anchoring Evapotranspiration h Car eoI :vey Infinite Slope Analysis ys„, y„. tan FS = cos 2 # tan fi ytan /3 Input Parameters gat(Pe) = 108 g, (pcf) = 62.4 F (deg.) = 33 c (psf) = 100 b (deg.) = 16.8 T (ft) = 6 Calculated Factor of Safety Zone 32 Assume groundwater has risen to the ground surface FS = 1.47 Stability of Infinite Slopes with SeepagE Angle,I Soil Properties Friction Angle, 0 Cohesion, c Factor of Safe Unit Weight, y Sat. Unit Weight, Tr. Soli Thickness Dw = Depth of Groundwater = Unit VVelght of Water igure Pro &dd by h Car Vegetation Root Gaesion Root Anchoring Evapotranspiration Geo ivey Infinite Slope Analysis = 7.„„ tan 0 FS 7„T cos' fi tan fi tan Input Parameters 9sat (pcf) = 108 (pcf) = 62,4 F (deg.) = 33 c (psf) = 100 b (deg.) = 25.2 T (ft) = 6 Calculated Factor of Safety FS = 0.98 Zone 33 Assume groundwater has risen to the ground surface tability of Infinite Slopes with Angle,13 Soil Properties Friction Angle, Cohesion, c Factor of Safety Calculation (FS3) Unit Weight. y FSs ysar-0,, tano Sat. Unit Weight, y yyst T cos20 Imp Wag tanti T= Sol I Thickness Dw=Depthof Groundwater yw = Unit Weight of Water V etation Root Cohesion Root Anchoring Evapotranspiration igure Pro ded byoth Car u vey Infinite Slope Analysis FS= +7„„_y„ tan y,.,,T cos' /3 tan /.3 y„„ tan i Input Parameters gsat (pcf) = 108 gw (pcf) = 62.4 F (deg.) = 33 c (psf) = 100 b (deg.) = 28.6 T. (ft) = 6 Zone 34 Assume groundwater has risen to the ground surface Stability of infinite Slopes with Seepage gl► Solt Properties Friction Angle,. Cohesion, c Unit Weight, y Sit. Unit Weight, Factor of Safety Calculation {FSs) FSs = c y - trine 7saM T cos211 tanii ani3 T aoH `ihicki Uni of ded by kton Cohesion Root Anchoring Evapotranspiration h`Car. ' . Geo Sxvey 0.9 1.8 2 7 Total Normal Stress, ksf Effective Normal Stress, ksf 3.6 4 5 5.4 Specimen No. 1 2 3 m c Water Content, % Dry Density, pcf Saturation, % Void Ratio Diameter, in, Height, in. 13.1 13.7 13.3 92.0 85.7 85.2 42.8 38.7 37.0 0.8189 0.9513 0.9638 2.875 2.869 2.855 5.628 5.664 5.621 Water Content, %Q Dry Density, pcf v Saturation, % Void Ratio Diameter, in. Height, in. 28.7 33.5 35.5 94.6 88.2 85.8 100.0 100.0 100.0 0.7679 0.8979 0.9502 2.848 2.843 2.848 5.575 5.612 5.608 Axial Strain, % Type of Test: CU with Pore Pressures Sample Type: Intact Tube Sample Description: Brown Silty Fine Sand Assumed Specific Gravity= 2.68 Remarks: All 3 Specimens failed with bulging. Specimen 2 was not considered in interpretation of results. ASTM D4767 & Corp of Engr EM 110-2-1906 Appendix X Strain rate, in./min. Back Pressure, psi Cell Pressure, psi Fail. Stress, ksf Total Pore Pr., ksf Ult. Stress, ksf Total Pore Pr., ksf 6i Failure, ksf 63 Failure, ksf 0.003 53.70 60.00 1.92 7.89 2.79 7.52 2.67 0.75 0.003 53.40 65.00 0.93 8.77 0.88 8.83 1.52 0,59 0.013 51.30 65.00 3.11 8.42 3.16 8.27 4.05 0.94 Client: Cliffs Communities Project: Cliffs at High Carolina Tunnel Bypass Location: TB-4/5, TB-4+32 ft, TB-5(B) Sample Number: Log 6353, 6355, 6357 Depth: 6 ft Proj. No.: 1413-07-019 Date Sampled: 7-24-08 TRIAXIAL SHEAR TEST REPORT S & ME INC. Tested By: LP, 7/28/08 Checked By: NRR, 8/6108 Shear Stress, ksf Deviator Stress, ks 0 5 10 15 Axial Strain, % Total Normal Stress, ksf Effective Normal Stress, ksf 20 Specimen No. 1 2 3 Water Content, Dry Density, pcf Saturation, % 2 '-E Void Ratio 3 1 Diameter, in. Height, in. I Water Content, % Dry Density, pcf t I Saturation, °A 1-1 Void Ratio Diameter, in. Height, in. 13.1 20.0 19.3 92.0 86.8 89.0 42.8 57.9 58.7 0.8189 0.9282 0.8799 2.875 2.879 2.875 5.628 5.668 5.656 28.7 33.6 31.6 94.6 88.1 90.5 100.0 100.0 100.0 0.7679 0.8997 0.8481 2.848 2.865 2.859 5.575 5.640 5.624 Type of Test: CU with Pore Pressures Sample Type: Intact Tube Sample Description: Brown Silty Fine Sand Strain rate, in./min. Back Pressure, psi Cell Pressure, psi Fail. Stress, ksf Total Pore Pr., ksf Ult. Stress, ksf Total Pore Pr., ksf 61 Failure, ksf a3 Failure, ksf 0.003 53.70 60.00 1.18 7.99 2.79 7.52 1.83 0.65 0.013 48.50 60.00 2.18 7.59 4.22 6.90 3.23 1.05 0.013 49.00 65.00 2.52 8.21 3.88 7.86 3.67 1.15 Assumed Specific Gravity- 2.68 Remarks: Specimen 1 and 3 failed with bulging, specimen 2 with a shear plane. ASTM D4767 & Corp of Engr EM 110-2-1906 Appendix X Uniform Strain Method Tested By: LP, 7/28/08 Client: Cliffs Communities Project: Cliffs at High Carolina Tunnel Bypass Location: TB-4/5, TB-9, TB-9+40 f1 Sample Number: Log 6353, 6361, 6357 Depth: 6 ft Proj. No.: 1413-07-019 Date Sampled: 7-24-08 TRIAXIAL SHEAR TEST REPORT S & ME, INC. Checked By: NRR, 8/6/08 Permit Rescission Form Information to be filled out by Central Office: Facility Name: The Cliffs at High Carolina Permit Number: WQ0033455 Regional Office:Asheville County: Buncombe Date Rescission Requested: January 27, 2017 Permit Expiration: December 31, 2016 Received Original Request: Form of Received Request: X Central Office Letter Information to be filled out by Region: Please Check Appropriately: Site Visit Performed Regional Office Signed Annual Fee Invoice Other Groundwater Concerns Addressed Render Decision for Rescission of the Above Referenced Permit: k Approved Denied Note: If approved this permit will become inactive in the BIMS database and will not be billed through the division billing system. Complete if Approved: Rescind Immediately Reason for Approval iCe l(tSS never inSaI(J T /YO,WrI Lverri or`b c (osort k db(q The rrw pro pi r4-7 0/.0noi S de nuT 141,nd +0 develop the pror,Q.r--y Reason for Denial J Signature of Certifier: , 44.J Date Certified: 0717 /l 7