The URL can be used to link to this page

Home My WebLink AboutSW3220402_Soils/Geotechnical Report_20220627/AM SUMMIT ENGINEERING. LABORATORY. TESTING November 14, 2017 Mr. Bobby MacNaughton LGI Homes - Southeast 3037 Sherman Drive Lancaster, South Carolina 29720 Email: bmacnau hg ton(cr�,lgihomes.com Subject: Estimated Seasonal High Water Table (ESHWT) Determination The Village at Granite Quarry Faith Road Granite Quarry, North Carolina SUNIlMT Project No. 3554.11 Dear Mr. MacNaughton: SUMMIT Engineering, Laboratory and Testing, P. C. (SUNIlMT) is pleased to submit this letter summarizing our observations of the soil test borings as related to Estimated Seasonal High Water Table Elevation (ESHWT) determinations. This report contains a brief description of the project information provided to us, general site and subsurface conditions revealed during this study. PURPOSE OF STUDY The primary purpose of this study was to obtain information regarding the subsurface conditions near the proposed Stormwater BMP ponds, assess the engineering characteristics of the subsurface materials, and determinations of the estimated seasonal high water table mark (if evident). This report contains the following items: ENGINEERING • LABORATORY • TESTING 3575 Centre Circle Drive I Fort Mill, South Carolina 29715 1 (704) 504 - 1717 1 (704) 504 - 1125 (Fax) WWW. SU M M IT-COM PAN [ ES. COM Summary of ESHWT Determination The Village at Granite Quarry SUMMIT Project Number 3554.11 November 14, 2017 • Photographic Logs, Site Vicinity Map and Boring Location Plan, • Summary of Test Boring Observations, visual soil classifications and descriptions, • A general review of the subsurface soils and estimated seasonal high water table depth from existing ground surface (if evident), • Groundwater level measurements. EXPLORATION PROCEDURES SUMMIT visited the site on October 13, 17, and 18 of 2017 to perform ten (10) soil test borings (identified as Borings B-1 through B-10) in the proposed Stormwater BMP ponds. The approximate locations of the borings are shown on Figure 2 — "Boring Location Plan" provided in Appendix 2. The client (LGI Homes - Southeast) provided SUMMIT a plan that indicated the approximate location of the proposed Stormwater BMP ponds. The boring locations were surveyed by other prior to this study. The soil test borings were performed using an ATV -mounted CME 550X drill rig and extended to approximate depths of 12 to 20 feet below the existing ground surface. Hollow -stem, continuous flight auger drilling techniques were used to advance the boring into the ground. Standard Penetration Tests (SPT) were performed within the mechanical boring at designated intervals in general accordance with ASTM D 1586. When properly evaluated, the SPT results can be used as an index for estimating soil strength and density. In conjunction with the penetration testing, representative soil samples were obtained from each test location and returned to our laboratory for visual classification and potential laboratory testing. The soil samples collected were visually examined and classified in general accordance with ASTM D- 2488. The Munsell Soil Color Charts (2009 Revision) were used to identify the hue, value, and chroma of soil samples. Water level measurements were attempted at the termination of drilling. The classification symbols are depicted on the "Boring Log" provided in Appendix 3. GENERALIZED SUBSURFACE STRATIGRAPHY General subsurface conditions observed during our geotechnical study are described herein. For more detailed soil descriptions and stratifications at a particular test location, the respective "Boring Log" provided in Appendix 3 should be reviewed. The horizontal stratification lines designating the interface between various strata represent approximate boundaries. Transitions between different strata in the field may be gradual in both the horizontal and vertical directions. 01 Summary of ESHWT Determination SUMMIT Project Number 3554.11 The Village at Granite Quarry November 14, 2017 Beginning from the ground surface, a layer of topsoil was observed at the ground surface with thicknesses ranging from 1 to 6 inches. Beneath the topsoil layer, existing fill (disturbed) soils were encountered in Borings B-2, B-3 and B-6 to approximate depths of 1.5 feet, 4 feet and 1 foot below the existing ground surface, respectively. When sampled, the existing fill soils generally consisted of sandy silts. These existing fill soils were visually classified as cultivated fill soils. Cultivated fill soil is defined as a layer that was plowed and disturbed for agricultural purposes. Residual (undisturbed) soils were encountered below the surface materials and existing fill soils in all of the borings performed for this study, and extended to either the maximum termination depth or partially weathered rock (PWR). When sampled, the residual (undisturbed) soils encountered that generally consisted of fat clays, lean clays, elastic silts and sandy silts. Partially weathered rock (PWR) conditions were encountered in nine (9) of the borings performed for this study at approximate depths ranging from 6 to 14 feet below the existing ground surface. PWR is defined as soil -like material exhibiting SPT N-values in excess of 100 bpf. When sampled, the PWR generally breaks down into sandy silts and silty sands with rock fragments. Auger refusal conditions were encountered in eight (8) of the borings performed for this study at approximate depths ranging from 12 to 18 feet below the existing ground surface. Auger refusal is defined as material that could not be penetrated by the drilling equipment used during our field study. Materials that might result in auger refusal include large boulders, rock ledges, lenses, seams or the top of parent bedrock. Core drilling techniques would be required to evaluate the character and continuity of the refusal material. However, rock coring was beyond the scope of this study and not performed. The following table summarizes the location and approximate depths that PWR and auger refusal conditions were encountered in the borings performed for this study. 3 Summary of ESHWT Determination The Village at Granite Quarry SUMMIT Project Number 3554.11 November 14, 2017 Summary Table of Partially Weathered Rock and Auger Refusal Depths Boring Partially Weathered Rock Approx. Depth, (feet) Auger Refusal Approx. Depth, (feet) B-1 10 18 B-2 14 16 B-3 12 16.2 B-4 15.5 16 B-5 ---- --- B-6 6 12 B-7 10.5 15 B-8 12.5 17.5 B-9 6 to 8 and 10 16 B-10 14 to 18 --- 'Depths were measured from the ground surface existing at the time drilling was performed. "---"When neither PWR nor auger refusal conditions were not encountered in boring GROUNDWATER LEVEL MEASUREMENTS Groundwater was not observed within the majority of the borings at the time of drilling (ATD). After waiting more than 72 hours, groundwater was observed in majority of the borings performed during this study at approximate depths ranging from 6 to 19.3 feet below the existing ground surface. It should be noted that groundwater levels tend to fluctuate with seasonal and climatic variations, as well as with some types of construction operations. Therefore, water may be encountered during construction at depths not indicated in the boring performed for this study. ESTIMATED SEASONAL HIGH WATER TABLE The ESHWT is defined as a change in the color of the soil layer due to water staining (typically, gray redoximorphic depletions and mottling). Spots or blotches of different color or shades of color interspersed with a dominant color in soil, commonly referred to as mottling. Mottling is a historic indication for the presence of groundwater caused by intermittent periods of saturation rd Summary of ESHWT Determination SUMMIT Project Number 3554.11 The Village at Granite Quarry November 14, 2017 and drying, and may be indicative of poor aeration and impeded drainage. Mottling is a "general indication of groundwater" flow through this layer, but it is not known whether the groundwater flow was recent. CONCLUSIONS Based on our observations, ESHWT indicators in the soils sampled were evident in all of the borings with the exception of Borings B-6 and B-9. We did not observe ESHWT indicators in the soils sampled in Borings B-6 and B-9 but we did observe groundwater in these borings after waiting more than 72 hours. Even though ESHWT indicators were not observed within these borings, we did observe a water stained soil stratum situated above a low permeable partially weathered rock (PWR) stratum encountered in the borings. The water stains in the soils most likely developed during perched water conditions as indicated by the existing groundwater conditions. Perched water conditions differ from the "true" or "permanent" water table. A perched water table is water standing above an unsaturated zone (i.e. PWR) and is often influenced by soil conditions, and occurrence of less permeable soils. Where the ESHWT is defined as the shallowest depth to a wet soil layer as a result of "true" or "permanent" groundwater at any time during the year. Also, as previously mentioned, groundwater was observed in Borings B-6 and B-9 after waiting more than 72 hours. The BMP designer should take into consideration that perched water conditions may exist above the low permeable PWR stratum. The following table summarizes the boring depths, the approximate depths and elevations of the ESHWT, and the approximate depths of groundwater (GW) at time of drilling (ATD) and after waiting more than 72 hours. 5 Summary of ESHWT Determination The Village at Granite Quarry SUMMIT Project Number 3554.11 November 14, 2017 Summary Table of Boring Depths, ESHWT depths, ESHWT Elevations and Groundwater Depths Test Locations Approx. Boring Depth (Feet)1 Existing Ground Elev. (msl) Approx. ESHWT Depth (Feet)1 ESHWT Elev. (msl) GW Depth ATD (Feet)1 GW Depth >72 Hours (Feet)1 B-1 18 738.86 5 733.86 --- 6 B-2 16 731.73 12 719.73 --- 12.9 B-3 18.2 728.28 6 722.28 --- 7 B-4 16 722.71 14 708.71 --- 14.3 B-5 20 748.74 10 738.74 NE NE B-6 12 728.73 NE --- --- 7.2 B-7 15 724.92 7.5 717.42 --- 10.7 B-8 17.5 733.49 6 727.49 --- 14.5 B-9 16 733.73 NE --- --- 11.2 B-10 20 728.81 10 718.81 --- 19.3 1 Depth from existing ground surface. NE- Not Encountered in Boring msl — Above Mean Sea Level The analyses and recommendations submitted in this report were based, in part, on data obtained from this study. If the above -described project conditions are incorrect or changed after the issuing of this report, or subsurface conditions encountered during construction are different from those reported, SUNEVHT should be notified and these recommendations should be re- evaluated based on the changed conditions to make appropriate revisions. We have prepared this report according to generally accepted geotechnical engineering practices. No warranty, express or implied, is made as to the professional advice included in this report. G Summary of ESHWT Determination SUMMIT Project Number 3554.11 The Village at Granite Quarry November 14, 2017 CLOSING SUMNHT appreciates the opportunity to provide our professional services for you on this project. If you have any questions concerning the information in this proposal or if we may be of further service, please contact us at 704.504.1717. Sincerely, SUNIlMT ,o o l l l i rw►l/ ��",...CARQIfr�i Z 1'f SUMMIT""'s_7 Engineering i C7 F Laboratory & ? LV M Testing, P.C. _ 1 pTi C-a3st -,, % �•... C; � E..QF ��,``�� ►►►1/J111t%W\ Todd A. Costner, EIT Senior Professional LIST OF APPENDICES 1 Figure No. I -Site Vicinity Map Figure No. 2 - Boring Location Plan 2 Boring Logs 3 Photographic Log ,•'P�'� CAAL ''•,, I- 23055 i .kCifidrG�.?� yw C. CC fir* "08111M 11 �r11,' 11/14/17 Kerry C. Cooper, PE Senior Geotechnical Engineer 7 Summary of ESHWT Determination The Village at Granite Quarry SUMMIT Project Number 3554.11 November 14, 2017 SUMMIT ENGINEERING. LABORATORY. TESTING APPENDIX I Figures SITE zsz<I Shop o a Chatham Ln Figure 1 Site Vicinity Map SCALE: NTS ()reek Crg�� IF66 Lyerty Pond Rd Byrd Rd �, Byr�y Rd A Q- 1 SC Paul Church Rd z- Q The Village at Granite Quarry Faith Road Granite Quarry, North Carolina SUMMIT Project No.: 3554.11 x373 Weld Q. a Fo I St Byrd Rd EXp4 SUMMIT 3575 Centre Circle Fon Mill, South Carolina 29715 (803)504-1717 xi L I f -B-1 0 r� �`- ESHWT — 10' lIF "ESHW T 6"�.- r 'Its • ESHWT NE �' t *s �' ai �`p� `, fr ■ `. .. lei$ t`P '�i� i P-�r �r9F-i_`_ , y �. s ■1� i~� i �, +�re�-] �i L ei ESHWT 7.5' ti `= i -~--- _ •f' _ B-2 ;fir_ j xx J sa'° v ESHWT —12'LL ESHWT — 14' � }ESHWT — NE ESHWT — 6' A11- L . � ,y � I� � e� � B-1 'Jcp L 4 °O~ . r �- B-5� ' ESHWT — 5' - _ _ - `- , 9 i ESHWT — 10' E y M Km_ � + f - � L Plan Date: November 14'1 2017 _�/- f �" _�•ri Imo- _ -- - _ � �R�L SR •� -- -�'r Figure 2 The Village at Granite Quarry Boring Location Plan Faith Road ` Approx. Soil Test Boring Granite Quarry, North Carolina i Location SUMMIT 3575 Centre Circle Forr Mill, South Carolina 29715 (803)504-1717 SCALE: NTS SUMMIT Project No.: 3554.11 Summary of ESHWT Determination The Village at Granite Quarry SUMMIT Project Number 3554.11 November 14, 2017 SUMMIT ENGINEERING. LABORATORY. TESTING APPENDIX 2 Boring Logs SUMMIT ENGINEERING, LAEoRAToRy & TESTING, INC. KEY TO SYMBOLS 3575 CENTRE CIRCLE DRIVE - FoRT MILL, SC 29715 SUMMIT WWW.SUMMIT-COMPANIES.COM CLIENT LGI Homes - Southeast PROJECT NAME The Village at Granite PROJECT NUMBER 3554.11 PROJECT LOCATION Granite QuarryNorth Carolina LITHOLOGIC SYMBOLS SAMPLER SYMBOLS (Unified Soil Classification System) Standard Penetration Test ❑ BLANK ® CH: USCS High Plasticity Clay CL: USCS Low Plasticity Clay FILL: Fill (made ground) ® MH: USCS Elastic Silt MLS: USCS Sandy Silt TOPSOIL: Topsoil WELL CONSTRUCTION SYMBOLS PWR: Partially Weathered Rock ABBREVIATIONS LL - LIQUID LIMIT (%) TV - TORVANE PI -PLASTIC INDEX (%) PID - PHOTOIONIZATION DETECTOR W - MOISTURE CONTENT (%) UC -UNCONFINED COMPRESSION DD - DRY DENSITY (PCF) ppm - PARTS PER MILLION NP - NON PLASTIC Water Level at Time -200 - PERCENT PASSING NO. 200 SIEVE Drilling, or as Shown PP - POCKET PENETROMETER (TSF) Water Level at End of 1 Drilling, or as Shown Water Level After 24 - Hours, or as Shown SUMMIT ENGINEERING, LABORATORY & TESTING, INC. BORING NUMBER B-1 3575 CENTRE CIRCLE DRIVE PAGE % OF % A& FORT MILL, SC 29715 SUMMIT WWW.SUMMIT-COMPANIES.COM CLIENT LGI Homes - Southeast PROJECT NAME The Village at Granite PROJECT NUMBER 3554.11 PROJECT LOCATION Granite QuarryNorth Carolina DATE STARTED 10/13/17 COMPLETED GROUND ELEVATION 738.86 ft HOLE SIZE 6 inches DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVE-IN: DRILLING METHOD Hollow Stem Auger �Z AT TIME OF DRILLING 6.00 ft / Elev 732.86 ft GW ATD LOGGED BY D. Smith CHECKED BY T. Costner TAT END OF DRILLING 6.00 ft / Elev 732.86 ft GW after 72 Hour NOTES See Figure 2 "Boring Location Plan" for Approx. Boring Location AFTER DRILLING --- 0 ~^ Q Lu" J w O_ (j O J (3 MATERIAL DESCRIPTION w } Hm g a 2Z < o } _ W S > O O- U Lu (w �ZJ O D Q m O> UZ A SPT N VALUE A 0 20 40 60 80 100 PL MC LL h—I 0 20 40 60 80 100 El FINES CONTENT (%) 0 20 40 60 80 100 738.9 ' ` ` Approx..2" of Topsoil (MH) FILL: Cultivated Soil Firm Strong Brown (7.5YR, 4/6) Elastic SILT SPT 1 3-4-4-5 (8) (MH) RESIDUUM: Firm Strong Brown (7.5YR, 4/6) Elastic SILT SPT 3-2-3-3 2 (5) (MH) Firm Pale Brown (2.5Y, 7/4) and Black (2.5Y, 2.5/1) Sandy 5.o Elastic SILT ESHWT —5 feet bgs SPT 3 2-3-4-5 (7) 733.9 (ML) Very Hard Light Gray (2.5Y, 7/1) and White (2.5Y, 8/1) Slightly Clayey Sandy SILT J (ML) Very Hard Dark Olive Brown (2.5Y, 3/3) and Light Gray (2.5Y, 7/1) Slightly Clayey Sandy SILT SPT 4 5-22-36-38 (58) (CH) Very Hard Yellowish Red (5YR, 4/6) and Dark Gray (7.5YR, 4/1) Fat CLAY SPT 20-24-32-34 (ML) Very Hard Gray (10YR, 5/1) and Yellow (10YR, 7/8) Sandy 5 (56) SILT 10.0 » 728.9 - >" �= (SM) Partially Weathered Rock (PWR) when sampled becomes Gray (10YR, 5/1) and Yellow (10YR, 7/8) Silty SAND SPT 6 22-50 (50/5") >> SPT 50 7 (50/5") SPT >> 50 1 5.0 723.9 y, , 8 50/2" SPT >> 50 " 9 50/3" Bottom of Boring at 18 feet bgs, Auger Refusal SPT 10 50/0.5" 20.0 718.9 SUMMIT ENGINEERING, LABORATORY & TESTING, INC. BORING NUMBER B-2 3575 CENTRE CIRCLE DRIVE PAGE % OF % A& FORT MILL, SC 29715 SUMMIT WWW.SUMMIT-COMPANIES.COM CLIENT LGI Homes - Southeast PROJECT NAME The Village at Granite PROJECT NUMBER 3554.11 PROJECT LOCATION Granite QuarryNorth Carolina DATE STARTED 10/17/17 COMPLETED GROUND ELEVATION 731.73 ft HOLE SIZE 6 inches DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVE-IN: DRILLING METHOD Hollow Stem Auger �Z AT TIME OF DRILLING 12.90 ft / Elev 718.83 ft GW ATD LOGGED BY D. Smith CHECKED BY T. Costner TAT END OF DRILLING 12.90 ft / Elev 718.83 ft GW after 72 Hour NOTES See Figure 2 "Boring Location Plan" for Approx. Boring Location AFTER DRILLING --- w o A SPT N VALUE A 0 O_ } } (w 0 20 40 60 80 100 PL MC LL h—I ~^ Q (.� O MATERIAL DESCRIPTION H m g _ W S > O � O ZJ D Q Lu" J a O- m O> 0 20 40 60 80 100 J 0 2 Z U U Z w < Lu El FINES CONTENT (%) 0 20 40 60 80 100 7317 `"' `` Approx. 4" of Topsoil (ML) FILL: (Cultivated Soils) SPT 3-4-5-5 Stiff Brownish Yellow (10YR, 6/8) Slightly Clayey Sandy SILT 1 (9) (MH) RESIDUUM: Stiff Brownish Yellow (10YR, 6/8) and Yellow (10YR, 7/9) Elastic SILT SPT 5-6-7-9 2 (13) (ML) Very Stiff Brownish Yellow (10YR, 6/8) and Yellow (2.5Y, 5.0 8/8) Slightly Clayey Sandy SILT SPT 4-10-10-15 (ML) Hard Brownish Yellow (10YR, 6/8) and Yellow (2.5Y, 8/8) Slightly Clayey Sandy SILT SPT 10-15-18-20 4 (33) (ML) Hard Light Yellowish Brown (10YR, 6/4) Slightly Clayey Sandy SILT SPT 10-18-22-24 5 (40) o.o (ML) Hard Yellowish Brown (10YR, 5/6) Slightly Clayey Sandy 721.7 SILT SPT 8-14-18-18 6 (32) (ML) Very Stiff Yellowish Brown (10YR, 5/6) and Light Gray (10YR, 7/1) Slightly Clayey Sandy SILT 12.9ft - SPT 5-8-19-29 ESHWT -12 feet bgs 7 (27) (SM) Partially Weathered Rock (PWR) when sampled becomes SPT 50 Dark Yellow Brown (10YR, 4/6) Silty SAND 8 (50/4") 15.0 . Bottom of Boring at 16 feet bgs, Auger Refusal SPT 9 20.0 711.7 SUMMIT ENGINEERING, LABORATORY & TESTING, INC. BORING NUMBER B-3 3575 CENTRE CIRCLE DRIVE PAGE % OF % A& FORT MILL, SC 29715 SUMMIT WWW.SUMMIT-COMPANIES.COM CLIENT LGI Homes - Southeast PROJECT NAME The Village at Granite PROJECT NUMBER 3554.11 PROJECT LOCATION Granite QuarryNorth Carolina DATE STARTED 10/13/17 COMPLETED GROUND ELEVATION 728.28 ft HOLE SIZE 6 inches DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVE-IN: DRILLING METHOD Hollow Stem Auger �Z AT TIME OF DRILLING 7.00 ft / Elev 721.28 ft GW ATD LOGGED BY D. Smith CHECKED BY T. Costner 1 AT END OF DRILLING 7.00 ft / Elev 721.28 ft GW after 72 Hour NOTES See Figure 2 "Boring Location Plan" for Approx. Boring Location AFTER DRILLING --- w o A SPT N VALUE A 0 O_ } } (w 0 20 40 60 80 100 PL MC LL h—I ~^ Q (.� (5 MATERIAL DESCRIPTION H m g _ W S > O � O ZJ D Q Lu" J a O- m O> 0 20 40 60 80 100 J 0 2 Z U U Z w < Lu El FINES CONTENT (%) 0 20 40 60 80 100 728.3 P/ `` Approx. 4" of Topsoil (ML) FILL: (Cultivated Soils) SPT 3-4-3-4 Firm Yellowish Brown (10YR, 5/6) Slightly Clayey Sandy SILT 1 (7) SPT 2-2-4-4 2 (6) (MH) RESIDUUM: Stiff Dark Yellowish Brown (10YR, 3/6) and Black (10YR, 2.5/1) 5.o Elastic SILT SPT 3 3-5-7-8 (12) 723.3 (MH) Stiff Dark Yellowish Brown (10YR, 3/6) and Black (10YR, 2.5/1) Elastic SILT SPT 3-5-6-6 ESHWT -6 feet bgs 7ft - 4 (11) (CL) Firm Light Brownish Gray (10YR, 6/2), Brownish Yellow (10YR. 5/8) and Black (10YR, 2.5/1) Sandy Lean CLAY SPT 1-2-3-5 5 (5) 10.0 718.3 (ML) Hard Light Brownish Gray (10YR, 6/2), Brownish Yellow (10YR, 5/8) and Black (10YR, 2.5/1) Sandy SILT SPT 14-12-38-50 6 (50) (ML) Partially Weathered Rock (PWR) when sampled becomes SPT 6-23-50 Light Brownish Gray (10YR, 6/2), Brownish Yellow (10YR, 5/8) 7 (50/1") » = and Black (10YR, 2.5/1) Sandy SILT >> 8 50/5.5" - - 713.3 >> SPT 50 SPT 10 Bottom of Boring at 18.2 feet bgs, Boring Terminated 50 20.0 708.3 SUMMIT ENGINEERING, LABORATORY & TESTING, INC. BORING NUMBER B-4 3575 CENTRE CIRCLE DRIVE A& PAGE % OF % FORT MILL, SC 29715 SUMMIT WWW.SUMMIT-COMPANIES.COM CLIENT LGI Homes - Southeast PROJECT NAME The Village at Granite PROJECT NUMBER 3554.11 PROJECT LOCATION Granite QuarryNorth Carolina DATE STARTED 10/17/17 COMPLETED GROUND ELEVATION 722.71 ft HOLE SIZE 6 inches DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVE-IN: DRILLING METHOD Hollow Stem Auger �Z AT TIME OF DRILLING 14.30 ft / Elev 708.41 ft GW ATD LOGGED BY D. Smith CHECKED BY T. Costner TAT END OF DRILLING 14.30 ft / Elev 708.41 ft GW after 72 Hour NOTES See Figure 2 'Boring Location Plan" for Approx. Boring Location AFTER DRILLING --- w o A SPT N VALUE A 0 O_ } } (w 0 20 40 60 80 100 PL MC LL h—I ~^ Q (j O MATERIAL DESCRIPTION Hm g _ W S > O �ZJ O D Q Lu" J a O- m O> 0 20 40 60 80 100 J (3 2Z U UZ w < Lu El FINES CONTENT (%) 0 20 40 60 80 100 722.7 `"'. `` Approx. 6" of Topsoil (MH) RESIDUUM: SPT 0-2-4-5 Firm Red (2.5YR, 4/8) Elastic SILT 1 (6) (MH) Stiff Red (2.5YR, 4/8) Elastic SILT SPT 3-6-6-6 2 (12) (ML) Firm Red (2.5YR, 4/8) Slightly Clayey Sandy SILT 5.o SPT 3-3-5-5 (ML) Stiff Brownish Yellow (10YR, 6/8) Slightly Sandy SILT SPT 4-4-5-6 4 (9) (ML) Soft Moist Brownish Yellow (10YR, 6/8) Slightly Sandy SILT SPT 2-2-2-3 5 (4) o.o (ML) Stiff Moist Brownish Yellow (10YR, 6/8) and Red (2.5YR, 712.7 4/8) Slightly Sandy SILT SPT 2-5-7-9 6 (12) (ML) Stiff Yellowish Brown (10YR, 5/8) Slightly Sandy SILT SPT 4-5-10-11 7 (15) (ML) Hard Light Olive Brown (2.5Y, 5/4) Sandy SILT 14.3ft 15.0 ESHWT -14 feet bgs SPT 8 12-18-21-50 (39) 707.7 Partially Weathered Rock (PWR) when sampled becomes Gray ' (2 5Y, 6/1) Rock Fragments Bottom of Boring at 16 feet bgs, Auger Refusal 9 (50/0.5") 20.0 702.7 SUMMIT ENGINEERING, LABORATORY & TESTING, INC. BORING NUMBER B-5 3575 CENTRE CIRCLE DRIVE PAGE % OF % A& FORT MILL, SC 29715 SUMMIT WWW.SUMMIT-COMPANIES.COM CLIENT LGI Homes - Southeast PROJECT NAME The Village at Granite PROJECT NUMBER 3554.11 PROJECT LOCATION Granite QuarryNorth Carolina DATE STARTED 10/13/17 COMPLETED GROUND ELEVATION 748.74 ft HOLE SIZE 6 inches DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVE-IN: DRILLING METHOD Hollow Stem Auger AT TIME OF DRILLING --- GW ATD - Dry LOGGED BY D. Smith CHECKED BY T. Costner AT END OF DRILLING --- GW after 72 Hour - Dry NOTES See Figure 2 'Boring Location Plan" for Approx. Boring Location AFTER DRILLING --- w o A SPT N VALUE A 0 O_ } } (w 0 20 40 60 80 100 PL MC LL h—I ~^ Q (j O MATERIAL DESCRIPTION Hm g _ W S > O �ZJ O D Q Lu" J a O- m O> 0 20 40 60 80 100 J (3 2Z U UZ w < Lu El FINES CONTENT (%) 0 20 40 60 80 100 748.7 `"' `` Approx. 6" of Topsoil (MH) RESIDUUM: SPT 2-4-6-9 Stiff Moist Yellowish Brown (10YR, 5/8) Elastic SILT 1 (10) (MH) Stiff Red (2.5YR, 4/5), Reddish Yellow (5YR, 6/8) and Black (5YR, 2.5/1) Elastic SILT J (MH) Very Stiff Red (2.5YR, 4/5), Reddish Yellow (5YR, 6/8) and Black (5YR, 2.5/1) Elastic SILT SPT 6-9-10-10 2 (19) (MH) Stiff Red (2.5YR, 4/5), Reddish Yellow (5YR, 6/8) and Black 5.0 (5YR, 2.5/1) Elastic SILT SPT 4-5-8-8 (CL) Stiff Reddish Yellow (5YR, 6/8) and Light Gray (5YR, 7/1) Lean CLAY SPT 3-6-6-6 4 (12) (CL) Firm Reddish Yellow (5YR, 6/8) and Light Gray (5YR, 7/1) Lean CLAY SPT 3-4-3-5 5 (7) 10.0 738.7 (ML) Firm Reddish Yellow (5YR, 6/8), Light Gray (5YR, 7/1) and Black (5YR, 2.5/1) Slightly Clayey Sandy SILT SPT 5-2-4-5 ESHWT —10 feet bgs 6 (6) 1-2-3-4 SPT (ML) Firm Brownish Yellow (10YR, 6/8) Slightly Sandy SILT 7 (5) (ML) Firm Brownish Yellow (10YR, 6/8) and Light Brownish Gray (10YR, 6/2) Slightly Sandy SILT 5.o SPT 8 2-3-5-5 (8) 733.7 (ML) Stiff Brownish Yellow (10YR, 6/8) and Light Brownish Gray (10YR, 6/2) Slightly Sandy SILT SPT 5-6-8-9 9 (14) (ML) Very Stiff Brownish Yellow (10YR, 6/8) and Light Brownish Gray (10YR, 6/2) Slightly Sandy SILT SPT 5-11-14-16 10 (25) 20.0 728.7 Bottom of Boring at 20 feet bgs, Boring Terminated SUMMIT ENGINEERING, LABORATORY & TESTING, INC. BORING NUMBER B-6 3575 CENTRE CIRCLE DRIVE A& PAGE % OF % FORT MILL, SC 29715 SUMMIT WWW.SUMMIT-COMPANIES.COM CLIENT LGI Homes - Southeast PROJECT NAME The Village at Granite PROJECT NUMBER 3554.11 PROJECT LOCATION Granite QuarryNorth Carolina DATE STARTED 10/17/17 COMPLETED GROUND ELEVATION 728.73 ft HOLE SIZE 6 inches DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVE-IN: DRILLING METHOD Hollow Stem Auger �Z AT TIME OF DRILLING 7.20 ft / Elev 721.53 ft GW ATD LOGGED BY D. Smith CHECKED BY T. Costner 1 AT END OF DRILLING 7.20 ft / Elev 721.53 ft GW after 72 Hour NOTES See Figure 2 "Boring Location Plan" for Approx. Boring Location AFTER DRILLING --- 0 ~^ Q Lu" J w O_ (.� (5 J 0 MATERIAL DESCRIPTION w } H m g a 2 Z < o } _ W S > O O- U Lu (w � O ZJ D Q m O> U Z A SPT N VALUE A 0 20 40 60 80 100 PL MC LL h—I 0 20 40 60 80 100 El FINES CONTENT (%) 0 20 40 60 80 100 728.7 P/ `` Approx. 4" of Topsoil (ML) FILL: (Cultivated Soils) Firm Strong Brown (7.5YR, 5/6) Slightly Clayey Sandy SILT SPT 1 2-2-4-4 (6) (MH) RESIDUUM: Firm Strong Brown (7.5YR, 5/6) Elastic SILT (ML) Firm Dark Grayish Brown (10YR, 4/2) and Dark Brown (10YR, 3/3) Slightly Clayey Sandy SILT SPT 2-2-3-3 2 (5) 5.o SPT 2-2-3-5 > (SM) Partially Weathered Rock (PWR) when sampled becomes SPT 50 Gray (2.5Y, 6/1) Silty SAND with Rock Fragments 4 50/4" 7.2ft >> S PT 5 (50/4.5") SPT 6 >> 718.7 50 (50/2") Bottom of Boring at 12 feet bgs, Auger Refusal PT 7 50 (50/1") 150 713.7 20.0 708.7 SUMMIT ENGINEERING, LABORATORY & TESTING, INC. BORING NUMBER B-7 3575 CENTRE CIRCLE DRIVE A& PAGE % OF % FORT MILL, SC 29715 SUMMIT WWW.SUMMIT-COMPANIES.COM CLIENT LGI Homes - Southeast PROJECT NAME The Village at Granite PROJECT NUMBER 3554.11 PROJECT LOCATION Granite QuarryNorth Carolina DATE STARTED 10/18/17 COMPLETED GROUND ELEVATION 724.92 ft HOLE SIZE 6 inches DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVE-IN: DRILLING METHOD Hollow Stem Auger �Z AT TIME OF DRILLING 10.70 ft / Elev 714.22 ft GW ATD LOGGED BY D. Smith CHECKED BY T. Costner TAT END OF DRILLING 10.70 ft / Elev 714.22 ft GW after 72 Hour NOTES See Figure 2 "Boring Location Plan" for Approx. Boring Location AFTER DRILLING --- 0 ~^ Q Lu" J w O_ (j O J (3 MATERIAL DESCRIPTION w } Hm g a 2Z < o } _ W S > O O- U Lu (w �ZJ O D Q m O> UZ A SPT N VALUE A 0 20 40 60 80 100 PL MC LL h—I 0 20 40 60 80 100 El FINES CONTENT (%) 0 20 40 60 80 100 724.9 Approx. 1" of Topsoil (MH) RESIDUUM: Firm Reddish Brown (5YR, 4/4) Elastic SILT SPT 1 3-3-3-4 (6) SPT 2-3-3-3 2 (6) (MH) Firm Reddish Yellow (5YR, 6/8) Elastic SILT 5.o SPT 3-3-4-4 (CL) Stiff Reddish Yellow (7.5YR, 6/8), Yellow (2.5Y, 8/8) and Light Gray (2.5Y, 7/2) Lean CLAY SPT 3-5-6-9 ESHWT -7.5 feet bgs 4 (11) (ML) Very Stiff Light Gray (2.5Y, 7/1) and White (2.5Y, 8/1) Sandy SILT SPT 3-10-14-16 5 (24) 10.0 SPT 6 » 714.9 22-36-50 (50/2") (SM) Partially Weathered Rock (PWR) when sampled 10.7ft - becomes Light Gray (2.5Y, 7/1) and White (2.5Y, 8/1) Silty SAND with Rock Fragments >> SPT 50 7 (50/3") - SPT >> 50 8 50/2" 1 5.0 709.9 Bottom of Boring at 15 feet bgs, Auger Refusal SPT 50 9 (50/0") 20.0 704.9 SUMMIT ENGINEERING, LABORATORY & TESTING, INC. BORING NUMBER B-8 3575 CENTRE CIRCLE DRIVE PAGE % OF % A& FORT MILL, SC 29715 SUMMIT WWW.SUMMIT-COMPANIES.COM CLIENT LGI Homes - Southeast PROJECT NAME The Village at Granite PROJECT NUMBER 3554.11 PROJECT LOCATION Granite QuarryNorth Carolina DATE STARTED 10/17/17 COMPLETED GROUND ELEVATION 733.49 ft HOLE SIZE 6 inches DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVE-IN: DRILLING METHOD Hollow Stem Auger �Z AT TIME OF DRILLING 14.50 ft / Elev 718.99 ft GW ATD LOGGED BY D. Smith CHECKED BY T. Costner TAT END OF DRILLING 14.50 ft / Elev 718.99 ft GW after 72 Hour NOTES See Figure 2 "Boring Location Plan" for Approx. Boring Location AFTER DRILLING --- 0 ~^ Q Lu" J w O_ (j O J (3 MATERIAL DESCRIPTION w } Hm g a 2Z < o } _ W S > O O- U Lu (w �ZJ O D Q m O> UZ A SPT N VALUE A 0 20 40 60 80 100 PL MC LL h—I 0 20 40 60 80 100 El FINES CONTENT (%) 0 20 40 60 80 100 Approx. 6" of Topsoil (MH) RESIDUUM: SPT 1-2-2-5 Soft Moist Reddish Yellow (7.5YR, 7/8) Elastic SILT 1 (4) (MH) Stiff Reddish Brown (5YR, 4/4) Elastic SILT SPT 3-5-7-8 2 (12) (ML) Firm Red (2.5YR, 4/8) and Reddish Yellow (7.5YR, 5/8) 5.o Slightly Clayey Sandy SILT SPT 2-2-3-3 (ML) Very Stiff Pale Brown (2.5Y, 8/2) and White (7.5YR, 8/1) Slightly Clayey Sandy SILT SPT 5-10-11-9 ESHWT -6 feet bgs 4 (21) 5-7-9-18 SPT 5 (16) 10.0 (ML) Very Hard Light Gray (2.5Y, 7/1) and White (7.5YR, 8/1) 723.5 Sandy SILT SPT 23-22-40-50 6 (62) SPT 7 » 10-48-50 (50/5") (ML) Partially Weathered Rock (PWR) when sampled becomes Light Gray (2.5Y, 7/1), White (7.5YR, 8/1) and Strong Brown (7.5YR, 5/8) Sandy SILT 15.o - 14.5ft - » ]�8 SPT 16-39-50 (50/3") 718.5 - >> SPT 50 9 50/4" Bottom of Boring at 17.5 feet bgs, Auger Refusal SPT 50 10 (50/0") 20.0 713.5 SUMMIT ENGINEERING, LABORATORY & TESTING, INC. BORING NUMBER B-9 3575 CENTRE CIRCLE DRIVE PAGE % OF % A& FORT MILL, SC 29715 SUMMIT WWW.SUMMIT-COMPANIES.COM CLIENT LGI Homes - Southeast PROJECT NAME The Village at Granite PROJECT NUMBER 3554.11 PROJECT LOCATION Granite QuarryNorth Carolina DATE STARTED 10/17/17 COMPLETED GROUND ELEVATION 733.73 ft HOLE SIZE 6 inches DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVE-IN: DRILLING METHOD Hollow Stem Auger �Z AT TIME OF DRILLING 11.30 ft / Elev 722.43 ft GW ATD LOGGED BY D. Smith CHECKED BY T. Costner TAT END OF DRILLING 11.30 ft / Elev 722.43 ft GW after 72 Hour NOTES See Figure 2 "Boring Location Plan" for Approx. Boring Location AFTER DRILLING --- w o A SPT N VALUE A 0 O_ } } (w 0 20 40 60 80 100 PL MC LL h—I ~^ Q (j O MATERIAL DESCRIPTION Hm g _ W S > O �ZJ O D Q Lu" J a O- m O> 0 20 40 60 80 100 J (3 2Z U UZ w < Lu El FINES CONTENT (%) 0 20 40 60 80 100 733.7 `"'. `` Approx. 4" of Topsoil (MH) RESIDUUM: SPT 3-6-7-11 Stiff Strong Brown (7.5YR, 5/8) Elastic SILT 1 (13) (MH) Very Stiff Red (2.5YR, 5/8) Elastic SILT SPT 5-8-13-13 2 (21) (ML) Very Stiff Brownish Yellow (10YR, 6/8) Slightly Clayey Sandy SILT 5.o SPT 11-15-15-21 (ML) Partially Weathered Rock (PWR) when sampled becomes SPT 21-50 Brownish Yellow (10YR, 6/8) and Light Gray (10YR, 7/1) Sandy 4 (50/5") » SILT with Rock Fragments (ML) Hard Brownish Yellow (10YR, 6/8) and Light Gray (10YR, 7/1) Sandy SILT with Rock Fragments SPT 8-16-27-38 5 (43) 10.0 723.7 . > (ML) Partially Weathered Rock (PWR) when sampled becomes SPT 36 Brownish Yellow (10YR, 6/8) Sand Light Gray (10YR, 7/1) Sandy 6 (50/5.5") » ;= SILT with Rock Fragments 11.3ft SPT » 50 7 (50/2") >> SPT 50 y, 8 50/1" 150 , 718. Bottom of Boring at 16 feet bgs, Auger Refusal SPT 9 50/0.5" 20.0 713.7 SUMMIT ENGINEERING, LABORATORY & TESTING, INC. BORING NUMBER B-10 3575 CENTRE CIRCLE DRIVE PAGE % OF % A& FORT MILL, SC 29715 SUMMIT WWW.SUMMIT-COMPANIES.COM CLIENT LGI Homes - Southeast PROJECT NAME The Village at Granite PROJECT NUMBER 3554.11 PROJECT LOCATION Granite QuarryNorth Carolina DATE STARTED 10/18/17 COMPLETED GROUND ELEVATION 728.81 ft HOLE SIZE 6 inches DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVE-IN: DRILLING METHOD Hollow Stem Auger �Z AT TIME OF DRILLING 19.30 ft / Elev 709.51 ft GW ATD LOGGED BY D. Smith CHECKED BY T. Costner TAT END OF DRILLING 19.30 ft / Elev 709.51 ft GW after 72 Hour NOTES See Figure 2 "Boring Location Plan" for Approx. Boring Location AFTER DRILLING --- w o A SPT N VALUE A 0 O_ } } (w 0 20 40 60 80 100 PL MC LL 0 -A ~^ Q (j O MATERIAL DESCRIPTION Hm g _ W S > O �ZJ O D Q Lu" J a O- m O> 0 20 40 60 80 100 J (3 2Z U UZ w < Lu El FINES CONTENT (%) 0 20 40 60 80 100 728.8 `"' `` Approx. 4" of Topsoil (MH) RESIDUUM: SPT 2-5-6-9 Stiff Red (2.5YR, 4/8) Elastic SILT 1 (11) SPT 3-4-5-6 2 (9) (ML) Very Stiff Yellow (2.5Y, 8/8) and White (2.5Y, 8/1) Slightly 5.o Clayey Sandy SILT SPT 3 9-11-14-16 (25) 723.8 SPT 11-11-12-12 4 (23) (ML) Very Stiff Very Pale Brown (10YR, 7/4) Slightly Clayey Sandy SILT SPT 6-10-14-16 5 (24) i o.o (ML) Stiff Very Pale Brown (10YR, 7/4) and Light Brownish Gray 718.8 (10YR, 6/2) Slightly Clayey Sandy SILT SPT 3-3-8-10 ESHWT —10 feet bgs 6 (11) (ML) Hard Very Pale Brown (10YR, 7/4) and Light Brownish Gray (10YR, 6/2) Slightly Clayey Sandy SILT SPT 6-9-23-34 7 (32) (ML) Partially Weathered Rock (PWR) when sampled becomes Pale Brown (10YR, 6/3), White (10YR, 8/1) and Red (2.5YR, 4/8) SPT 16-17-50 ' S Sandy SILT with Rock Fragments 8 (50/6") 713.8 �> » SPT 50 9 50/5" (ML) Hard Pale Brown (10YR, 6/3), White (10YR, 8/1) and Red (2.5YR, 4/8) Sandy SILT with Rock Fragments SPT 24-26-19-18 19.3ft - 10 (45) �08.8 Bottom of Boring at 20 feet bgs, Boring Terminated Summary of ESHWT Determination The Village at Granite Quarry SUMMIT Project Number 3554.11 November 14, 2017 SUMMIT ENGINEERING. LABORATORY. TESTING APPENDIX 3 Photographic Log Summary of ESHWT Determination SUMMIT Project Number 3554.11 The Village at Granite Quarry November 14, 2017 Boring B-1 Samples (Approximate Depth = 0 to 10 feet below existing ground surface) Boring B-2 Samples (Approximate Depth = 10 to 18.2 feet below existing ground surface) Summary of ESHWT Determination SUMMIT Project Number 3554.11 The Village at Granite Quarry November 14, 2017 Boring B-2 Samples (Approximate Depth = 0 to 10 feet below existing ground surface) Boring B-2 Samples (Approximate Depth = 10 to 16 feet below existing ground surface) Summary of ESHWT Determination SUMMIT Project Number 3554.11 The Village at Granite Quarry November 14, 2017 Boring B-3 Samples (Approximate Depth = 0 to 10 feet below existing ground surface) Boring B-3 Samples (Approximate Depth = 10 to 18.2 feet below existing ground surface) Summary of ESHWT Determination SUMMIT Project Number 3554.11 The Village at Granite Quarry November 14, 2017 Boring B-4 Samples (Approximate Depth = 0 to 10 feet below existing ground surface) Boring B-4 Samples (Approximate Depth = 10 to 16 feet below existing ground surface) Summary of ESHWT Determination SUMMIT Project Number 3554.11 The Village at Granite Quarry November 14, 2017 Boring B-5 Samples (Approximate Depth = 0 to 10 feet below existing ground surface) Boring B-5 Samples (Approximate Depth = 10 to 20 feet below existing ground surface) Summary of ESHWT Determination SUMMIT Project Number 3554.11 The Village at Granite Quarry November 14, 2017 Boring B-6 Samples (Approximate Depth = 0 to 10 feet below existing ground surface) Boring B-6 Samples (Approximate Depth = 10 to 12 feet below existing ground surface) Summary of ESHWT Determination SUMMIT Project Number 3554.11 The Village at Granite Quarry November 14, 2017 Boring B-7 Samples (Approximate Depth = 0 to 10 feet below existing ground surface) Boring B-7 Samples (Approximate Depth = 10 to 15 feet below existing ground surface) Summary of ESHWT Determination SUMMIT Project Number 3554.11 The Village at Granite Quarry November 14, 2017 Boring B-8 Samples (Approximate Depth = 0 to 10 feet below existing ground surface) Boring B-8 Samples (Approximate Depth = 10 to 17.5 feet below existing ground surface) Summary of ESHWT Determination SUMMIT Project Number 3554.11 The Village at Granite Quarry November 14, 2017 Boring B-9 Samples (Approximate Depth = 0 to 10 feet below existing ground surface) Boring B-9 Samples (Approximate Depth = 10 to 16 feet below existing ground surface) Summary of ESHWT Determination SUMMIT Project Number 3554.11 The Village at Granite Quarry November 14, 2017 Boring B-10 Samples (Approximate Depth = 0 to 10 feet below existing ground surface) Boring B-10 Samples (Approximate Depth = 10 to 20 feet below existing ground surface)