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Home My WebLink AboutSW3170702_HISTORICAL FILE_20171002STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW 7MI DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE7%(��' YYYYMMDD ENGINEERING. LABORM 19TNG April 22, 2016 Mr. Bob Burkett Timberline Construction & Development Inc. 8880 Graham Point Lane Union County, North Carolina 28037 Email: bobburkett@be]Isouth.net 10 o�laaaO�y 2 FO ash/PPGa y�� O, 9P°'o tPPc ,p 0P Subject: Estimated Seasonal High Water Table (ESHWT) Determinations Old Charlotte Highway Site Old Charlotte Highway (Hwy 74) Union County, North Carolina SUMMIT Project No. 3978.01 Dear Mr. Burkett: SUMMIT Engineering, Laboratory and Testing, Inc. (SUMMIT) 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 for the proposed BMP ponds to be constructed on the planned Old Charlotte Highway Site. This report contains a brief description of the project information provided to us, general site and subsurface conditions revealed during the exploration. PURPOSE OF STUDY The primary purpose of this study was to obtain information regarding the subsurface conditions near the proposed BMP ponds, assess the engineering characteristics of the subsurface materials, and determination of estimated seasonal high water table mark (if evident). This report contains the following items: • Photographic Logs, Site Location Map and Boring Location Plan, • Boring Logs, visual soil classifications and descriptions, • A general review of the subsurface soils, geological stratigraphy and estimated seasonal high water table depth from existing ground surface (if evident). • Water level measurements. ENGINEERING • LABORATORY • TESTING 3575 Centre Circle Drive I Fort Mill, South Carolina 29715 1 (704) 504 - 1717 1 (704) 504 - 1125 (Fax) WWW.SUMMIT-COMPANIES.COM Summary of ESHWT Determination SUMMIT Project Number 3978.01 Old Charlotte Highway Site, Union County, North Carolina - April 22, 2016 EXPLORATION PROCEDURES SUMMIT performed five (5) soil test borings, (identified as B-16 through B-20), in the approximate locations shown on Figure 2 — Boring Location Plan. The borings were located by professionals from our office using handheld GPS, existing topographic and aerial maps as reference. The boring locations were not surveyed and should be considered approximate. Timberline Construction & Development Inc (Client) provided SUMMIT a "Preliminary Subdivision Sketch Plan", dated February 24, 2016 developed by Kenney Design Group, PA, which indicated the approximate locations of the proposed BMP ponds. The soil test borings were performed using an ATV -mounted CME 550X drill rig and extended to depths of approximately 8.3 to 10 feet below the existing ground surface. Hollow -stem, continuous flight auger drilling techniques were used to advance the borings into the ground. Standard Penetration Tests (SPT) were performed within the mechanical borings at designated 24 inch intervals in general accordance with ASTM D 1586. The soil samples collected were visually examined and classified in general accordance with ASTM D-2488 and the Munsell Soil Color Charts (2009 Revision) were used to identify the hue, value, and chroma of soil samples. The classification symbols are depicted on the Boring Logs provided in Appendix 2. GENERALIZED SUBSURFACE STRATIGRAPHY General subsurface conditions observed during our geotechnical exploration are described herein. For more detailed soil descriptions and stratifications at a particular soil test boring, the respective "Boring Logs" provided in Appendix 2 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. The general stratigraphy encountered within the borings is summarized as follows. Beginning from the ground surface, a layer of Topsoil (surficial organic soils) were encountered at the existing ground surface at all boring locations and extended down to approximately 2 to 3 inches. Beneath the topsoil layer, residual (undisturbed) soils were encountered and extended to either the maximum boring termination depth or partially weathered rock (PWR). The residual soils generally consisted of fat clays, lean clays, elastic silts, and sandy silt. Summary of ESHWT Determination SUMMIT Project Number 3978.01 Old Charlotte Highway Site, Union County, North Carolina April 22, 2016 Partially Weathered Rock (PWR) was encountered at approximate depths below the existing ground surface of 8 feet in Borings B-16, B-17 and B-19, between the depths of 4.5 to 8 feet in Boring B-18, and at 7.5 feet in Boring B-20. Partially weathered rock is defined as soil - like material exhibiting N-values in excess of 100 bpf. GROUNDWATER LEVEL MEASUREMENTS Groundwater, at the time of drilling, was not encountered in any of the borings. After waiting more than 24 hours, groundwater was observed near the ground surface of Boring B-16 and was measured at a depth of 3 feet below the existing ground surface in Boring B-19. The groundwater reading after 24 hours in Boring B-16 may be the result of either stormwater runoff or perched water conditions. Note: Groundwater levels tend to fluctuate with seasonal and climatic variations, as well as with some types of construction operations. ESTIMATED SEASONAL HIGH WATER TABLE The Estimated Seasonal High Water Table (ESHWT) indictors were encountered in all of the boring performed during this exploration at approximated depths ranging from 3 to 6 feet below the existing ground surface. 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 ground water caused by intermittent periods of saturation 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. The table summarizes the boring sampled depths, the approximate depths of the ESHWTs, and the approximate depths of groundwater (GW) at time of drilling (ATD), and groundwater depths after waiting more than 24 hours. 3 Summary of ESHWT Determination SUMMIT Project Number 3978.01 Old Charlotte Highway Site, Union County, North Carolina April 22, 2016 SUMMARY TABLE OF ESHWT DEPTHS AND WATER LEVELS GW GW Depth GW Depth GW After Boring ,ESHWT Depth" After 24 Boring ESHWT Depth 24 'Test Depth ' "Depth ATD ' Hours" Test. Depth Depth ATD Hours Locations (Feet)' (Feet)', _ (Feet)' -.(Feet),''_ Locations (Feet)' (Feet)' (Feet)' (Feet)' At B-16 8.4 4 NE Ground B-19 9.9 3 NE 3 Surface '- B-17 9.8 6 NE NE B-20 8.3 5 NE NE B-18 10 4.5 NE NE 1 - Not Encountered within the depths sampled 2 - The groundwater reading after 24 hours in Boring B-16 may be the result of either stormwater runoff or perched water conditions. CLOSING SUMMIT 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, SUMMIT ��•�..�...C..... 2�' SUMMIT ' 1 Engineering, % Laboratory & mi Testing, Inc. x`:,•• C-2530 .` iCgTe OF \-%G 0111101 Todd A. Costner, EI Senior Professional Summit's NC Certificate of Licensure No. 2530 LIST OF APPENDICES 1 Photographic Logs 2 Figure No. l —Site Location Map Figure No. 2 - Boring Location Plan 3 Boring Logs \`\�tuutt,ttr A-po,-.4.�'a CARD//,,GAS r42323 %INEE. �+ tllPR G; \ Robert L. Price, PE Senior Geotechnical Engineer 4/22/2016 4 Summary of ESHWFI)etermination SUMMIT Project Number 3978.01 Old Charlotte Highway Site, Union County, North Carolina April 22, 2016 SUMMIT ENGINEERING • LABORATORY • TESTING APPENDIX 2 Figures /'High School 17 slr Charlotte Pipe & Foundry South Piedmont t4mmuniiy College f-1-3-5fl 4R Yale Locks& Hardware a C, -C Q Poe 01' Figure 1 Old Charlotte Highway Site Site Location Map Old Charlotte Highway ek Union County, North Carolina SUMMIT 3575C=nCimle lortllil(l,,Ioulhl!,-Iina29715 ISCALE:NTS I SUMMIT Project No.: 3978.01 . '.7 B-1 B_2f . , 119 �� • ' it I 1 In. $' -" - f _ . '' �A ' t ♦ �e. -_tom �� ` H 10 - 1AI + 1?i : �.•\• �.I i' .,� Pi f it ,. 13 �, \� \ ' i♦ � • r. [ / / � {$'y. _ _� � � � ' Hilt IIh ` i t r� `1 •. 1 . t ' Boring Locations will not be surveyed and should be considered approximate Figure 2 Boring Location Plan Old Charlotte Highway Site Approx. Soil Test Boring Location Old Charlotte Highway Approx. Hand Auger Boring Union County, North Carolina S U M M I ~ y Location 3575 Centre Circle SUMMIT ProNo.: 3978.01 Fort Mill, South Carolina 29715 SCALE: NTS 1 (303) 504-1717 Summary of ESHWI'Determination SUMMIT Project Number 3978.01 Old Charlotte Highway Site, Union County, North Carolina April 22, 2016 ENGINEERING • LABORATORY • TESTING APPENDIX 3 Boring Logs //� SUMMIT ENGINEERING,LABORATORY&TESTING. INC. KEY TO SYMBOLS 3575 CENTRE CIRCLE DRIVE FORT MILL, SC 29715 SUMMIT WWW.SUMMITCOMPANIES.COM CLIENT Timberline Construction & Development Inc. PROJECT NAME Old Charlotte Highway Site PROJECT NUMBER 3978.01 PROJECT LOCATION Union County, North Carolina LITHOLOGIC SYMBOLS SAMPLER SYMBOLS (Unified Soil Classification System) ❑Standard Penetration Test BLANK CH: USCS High Plasticity Clay CL: USCS Low Plasticity Clay MH: USCS Elastic Silt MLS: USCS Sandy Silt TOPSOIL: Topsoil - PWR: Partially Weathered Rock WELL CONSTRUCTION SYMBOLS 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 4 -200 - PERCENT PASSING NO. 200 SIEVE Drilling, or as Shown PP - POCKET PENETROMETER (TSF) Water Level at End of Drilling, or as Shown Water Level After 24 Hours, or as Shown SUMMIT ENGINEERING,LABORATORY&TESTING, INC. BORING NUMBER B-16 3575 CENTRE CIRCLE DRIVE PAGE 1 OF 1 FORr MILL SC 29715 SUMMIT WWW.SUMMIT�COMPANIES.COM CLIENT Timberline Construction & Development Inc. PROJECT NAME Old Charlotte Highway Site PROJECT NUMBER 3978.01 PROJECT LOCATION Union County, North Carolina DATE STARTED 3125/16 COMPLETED 3/25116 GROUND ELEVATION HOLE SIZE 6 inches DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVEaN: DRILLING METHOD Hollow Stem Auger AT TIME OF DRILLING — GW NE ATD / Caved in Depth 8b s LOGGED BY J. Johnson CHECKED BY T. Costner TATENDOFDRILLING 0.10 It GW Aker 24 Hrs at Surface NOTES See Figure 2 "Boring Location Plan" for Boring Location AFTER DRILLING — W o ♦ SPT N VALUE A ZO U d tr > In 2 0 20 40 60 80 100 L C L PL MC LL ~ �• ¢ r (� a 0 MATERIAL DESCRIPTION m g _ W O > O > > Z j O Z¢ J v J OU of m O> 0 20 40 60 80 100 i z W W ❑ FINES CONTENT (%) ❑ N It Approx. 2" of Topsoil .._....,._._.. i........ i................. (CH)RESIDUUM: Very Soft Moist Light Olive Brown and Light Gray Fat CLAY SPT 0-0-1-2 (2.5Y, 5/4) 1 (1) ....... — — — — _ (CH) Soft Moist Light Olive Brown and Light Gray Fat CLAY ......._........;-;........ (2.5Y, 5/4) _..i... .._.........',.... ._.......... SPT 1-1-2-2 2 (3) (ML) Very Stiff Moist Light Yellow, Light Gray and Black Clayey Fine Slightly Sandy SILT with Rock Fragments (2.5Y, 6/6) -----I-i-- SPT 5-12-15-17 3 (27) (ML) VeryHard light Brownish 73ray, Olive Yellow and Black Fine Slightly Sandy SILT with Rock Fragments (2.5Y, 612) SPT 27-30-45-50 L._._. 4 (75) ..__..........L. _,.,,L _.....,.. _.... ....... i...... (ML) Partially Weathered Rock (PW R) when sampled become sBR _ Pale Yellow Fine Slightly Sandy SILT with Rock Fragments (5Y, SPT 5 50 50I5" 7/3) Bottom of Boring at 8.4 feet bas. Boring Terminated SUMMIT ENGINEERING, LABORATORY&TESTING, INC. BORING NUMBER B-1/ 3575 CENTRE CIRCLE DRIVE PAGE 1 OF 1 Fora MILL, SC 29715 SUMMIT WWW.SUMMITCOMPANIES.COM CLIENT Timberline Construction 8 Development Inc. PROJECT NAME Old Charlotte Highway Site PROJECT NUMBER 3978.01 PROJECT LOCATION Union CountyNorth Carolina DATE STARTED 3/25/16 COMPLETED 3/25/16 GROUND ELEVATION HOLE SIZE 6 inches DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVEaN: DRILLING METHOD Hollow Stem Auger AT TIME OF DRILLING — GW NE ATD / Caved in De thh @ 6.5' bgs LOGGED BY J. Johnson CHECKED BY T. Costner AT END OF DRILLING — GW After 24 Hrs NE NOTES See Figure 2 "Boring Location Plan" for Boring Location AFTER DRILLING — ZO L) a C.!O w" W O MATERIAL DESCRIPTION w o_ ¢ �w W> o_O QZ N e > m^ 0 OD 0 cc 09 I-D O j¢ m0> 0z ♦ SPT N VALUE 0 20 40 60 80 100 me LL 0 2040 60 80 100 ❑ FINES CONTENT (%) ❑ 0 20 40 60 80 100 Approx. 2" of Topsoil (MH)RESIDUUM: ` _._._ _...._..i................. Very Stiff Light Olive Brown and Yellow Elastic SILT(2.5Y, 7/8) SPT 8-17-13-14 1 (30) (ML) Very Stiff Pale Olive Brown and Light Brownish Gray Fine . Slightly Sandy SILT with Rock Fragments (5Y, 6/3) - -- - - _____________________________ (ML) Very Hard Pale Olive Brown and Light Brownish Gray Fine .. ..._...:. ....._......... zs Slightly Sandy SILT with Rock Fragments(5Y, 6/3)--.----:--:--�-- SPT 17-29-30-27 _ 2 (59) ..__,i__.... _ _____________________________ (ML) Hard Pale Olive Brown and Light Brownish Gray Fine .. ......:. ................ ` Slightly Sandy SILT with Rock Fragments (5Y, 6/3) ........:........:. ............. 50 SPT 3 22-19-22-21 (41) - _. ----------------------------_ (ML) Hard Moist Light Brownish Gray, White and Yellow Clayey Fine Sandy SILT(2.5 Y, 6/2) 6.5ft------------" _ SPT 13-15-26-47 4 (41) zs :;;) - r;•^ (ML) Partially Weathered Rock (PW R) when sampled becomes Light Brownish Gray and Black Fine Slightly Sandy SILT with Rock Fragments (2.5Y, 6/2) SPT 5 20-37-50 (50/4") - Bottom of Boring at 9.3 feet bgs, Boring Terminated SUMMIT ENGINEERING,LABORATORY&TESTING, INC. BORING NUMBER B-18 3575 CENTRE CIRCLE DRIVE //� PAGE 1 OF 1 FORT MILL. SC 29715 U SMMIT WWWSUMMIT-COMPANIES.COM CLIENT Timberline Construction & Development Inc. PROJECT NAME Old Charlotte Highway Site PROJECT NUMBER 3978.01 PROJECT LOCATION Union County, North Carolina DATE STARTED 3/25/16 COMPLETED 3/25116 GROUND ELEVATION HOLE SIZE 6 inches DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVE-IN: DRILLING METHOD Hollow Stem Auger AT TIME OF DRILLING — GW NE ATD / Caved in Depth Cal T bgs LOGGED BY J. Johnson CHECKED BY T. Costner AT END OF DRILLING — GW NE After 24 HRs NOTES See Figure 2 "Boring Location Plan" for Boring Location AFTER DRILLING — W e` ♦ SPT N VALUE p U a of �w > rn w 0 20 40 60 80 100 1 O 1 zLL O MATERIAL DESCRIPTION 2 ^ > 00 rD O j C W " _1 o- � O m O > 0 20� 40 60 80 100 1+ C7 ¢ Z Itl O ? ❑ FINES CONTENT (%) ❑ n It 0 20 40 60 80 100 Approx. 2" of Topsoil (CL) RESIDUUM: ............... i........ Stiff Moist Light Olive Brown and Light Brownish Gray Lean CLAY SPT 2-4-7-18......:....... (2.5Y, 5/4) 1 (11) ......... (CL) Very Stiff Olive and Yellowish Olive Lean CLAY (5Y, 5/4) 2.5 SPT 12-15-15-17 2 (30) SPT ->> 17-32-50 (ML) Partially Weathered Rock (PWR) when sampled becomes ,r'_{ 50 Light Brownish Yellow, White and Yellowish Brown Fine Slightly Sandy SILT (2.5Y, 6/2) 3 (50/5") (ML) Partially Weathered Rock (PWR) when sampled becomes .SPT 32-50 Yellow and Olive Yellow Fine Slightly Sandy SILT (2.5Y, 7/6) IYA'I 4 (50/4" ) -I 7ff 7.5 (ML) Very Hard Yellow, Light Brownish Yellow and Brown Fine Slightly Sandy SILT with Rock Fragments (2.5Y, 7/6) - ----'- - SPT 35-46-35-38 Lao Bottom of Boring at 10 feet bgs, Boring Terminated Izs 150 i SUMMIT ENGINEERING,LABORATORY&TESTING, INC. BORING NUMBER B-19 3575 CENTRE CIRCLE DRIVE PAGE 1 OF 1 Fow MILL, SC 29715 SUMMIT WWW.SUMMITCOMPANIES.COM CLIENT Timberline Construction & Development Inc. PROJECT NAME Old Charlotte Highway Site PROJECT NUMBER 3978.01 PROJECT LOCATION Union CountyNorth Carolina DATE STARTED 3/25/16 COMPLETED 3/25/16 GROUND ELEVATION HOLE SIZE 6 inches DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVEaN: DRILLING METHOD Hollow Stem Auger AT TIME OF DRILLING — GW NE ATO / Caved in Depth @ 7.5' bgs LOGGED BY J. Johnson CHECKED BY T. Costner TAT END OF DRILLING 3.00 ft GW NE After 24 HRs NOTES See Figure 2 "Boring Location Plan" for Boring Location AFTER DRILLING — w o ♦ SPT N VALUE ZO U a. IY �w > w w 0 20 40 60 80 100 Imo.� — �I _ a x O MATERIAL DESCRIPTION ¢^ j 0' O O j Q w" a O O m O> 0 20 40 60 80 100 O Z O ? I+ 0 ❑ FINES CONTENT (%) ❑ of Olive Yellow Elastic SILT (10Y, 7/8) ' SPT 1 (CL) Very Stiff Moist Olive Yellow and Light Brownish Gray Lean CLAY (10Y, 7l8) SPT 3ft 2 (CL) Very Stiff Light Gray and Olive Yellow Lean CLAY (2.5Y, 6/1) -- 11II 4 SPT 3 (ML) Very Stiff Pale Brown, Light Brownish Gray and Black Fine Slightly Sandy SILT (2.5Y, 7/3) _ (ML) Very Hard Pale Brown, Light Brownish GraFin y and Black e Slightly Sandy SILT (2.5Y, 7/3) SPT 7.5ft Pale Brown, Light Brownish Gray and Black Fine Slightly Sandy SPT SILT (2.5Y, 713) Bottom of Boring at 9.9 feet bgs, Boring Terminated SUMMIT ENGINEERING,LABORATORY&TESTING, INC. BORING NUMBER B-LO 3575 CENTRE CIRCLE DRIVE ALk PAGE I OF 1 FORT MILL, SC 29715 SUMMIT WWW.SUMMIT�COMPANIES.COM CLIENT Timberline Construction & Development Inc. PROJECT NAME Old Charlotte Highway Site PROJECT NUMBER 3978.01 PROJECT LOCATION Union CountyNorth Carolina DATE STARTED 3/24116 COMPLETED 3/24/16 GROUND ELEVATION HOLE SIZE 6 inches DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVE4N: DRILLING METHOD Hollow Stem Auger AT TIME OF DRILLING — GW NE ATD / Caved in Depth (@ 7, bgs LOGGED BY J. Johnson CHECKED BY T. Costner AT END OF DRILLING — GW NE After 24 HRs NOTES See Figure 2 "Boring Location Plan" for Boring Location AFTER DRILLING — w o ♦ SPT N VALUE ZO U o- of> �w 02 0 20 40 60 80 100 • IL r O MATERIAL DESCRIPTION g X^ > O rD O j¢ w" K n- O OS m O> 0 20� 40 60 80 100 W (� aZ W UZ ❑FINES CONTENT (%) ❑ _ N � 0 20 40 60 80 100 - Approx. 2" of Topsoil (MH)RESIDUUM: --' -"--- Firm Moist Olive Yellow and Light Brownish Gray Elastic SILT SPT 2-3-4-5 _ .. (ML) Firm Olive Fine Slightly Sandy SILT (5Y, 5/3) .. ...i. ..._;.__. 25 SPT 6-6-11-16 2 (17) _ _________________________ (ML) Very Still Light Olive Gray, light Brownish Yellow and Black .._....:.. _. ...... Fine Slightly Sandy Silt with Rock Fragments (5Y, 612)_____�- :----- - (ML) Very Hard Light Olive Gray, Light Brownish Yellow and _ Black Fine Slightly Sandy Silt with Rock Fragments (5Y, 6/2) 5.0 - SPT 8-21-38-40 3 (59) ----------------------------- (ML) Hard Light Olive Gray, Light Brownish Yellow and Black Fine Slightly Sandy Silt with Rock Fragments (SY,.............-,-- SPT 21-19-31-50 - 7tt - 4 (50) T5 - (ML) Partially Weathered Rock (PWR) when sampled becomes 'r• '. . Pale Brown Fine Sandy SILT with Rock Fragments (2.5Y, 7/3) SPT 50 - Bottom of Boring at 8.3 feet bgs, Boring Terminated 5 50/5" ioo 125 150 Bob Burkett From: Mike Kenney [mkenney@kenneydesign.com] Sent: Tuesday, September 20, 2016 3:01 PM To: bobburkett@bellsouth.net Cc: DAN I ELC8562@GMAT L.COM Subject: Harkey Creek I talked to Lee and they need all the 12" trees within the setbacks along the exterior property line. I will also need your soils guy to determine the Average High Water table on all the places where a BMP may need to go si Jeff can determine the bottom of the basins. I have told Daniel to locate the trees and place a stake for the soils guy. Mike Kenney Kenney Design Group 1216 Parsons Trail Denver, NC 28037 704/377-6099 704/634-7186 (cell) VTVV 7+50 7+00 Connect stream with dashed lines. O3A-UPLAND Si -INTERMITTENT S-2 Ephemeral End of Intermittent \5� Pond Stream S-1 i 50 It +P 1 A->:�, o I A Upland 1+50 Drained Pond O-1 End of Ephemeral Stream S-2 IZ 50 9+00 Connect stream with dashed lines. Connect stream with dashed lied WETLAND * 4-A Upland S)kPHTMERAL Ephemeral Ki S N. Nl` RPW 3+00 Connect str3+00 eam X with dashed lines. Project Narrative for Storm Water Treatment and Management For Harkey Creek Subdivision Union County, North Carolina �F0F 2 <a OF Moose ia¢°�,��(�, S The project is a subdivision consisting of 175 single family lots, 85 townhomes and an ameeti�°too area. The proposed construction activities on the 78.3 acre site include grading, erosionF�e control, sanitary sewer collection systems, water distribution systems, storm drainage systems, the construction of roads and homes. A detailed erosion control plan will be approved and implemented prior to any grading activities. Erosion control features will include silt fence, diversion ditches, and sediment traps which will ultimately be converted into BMPs after stabilization of the site. Due to the existing topography seven BMPs are proposed, all wet ponds. A high SHWT makes most other BMPs on the site problematic. To the extent practicable all storm water from built upon areas will be directed to the BMPs for treatment. Most of the storm water will be collected in catch basins along the curb and gutter type streets and piped to the BMPs. A smaller about of the storm water runs directly into the BMPs. Impervious area is limited to 2700 sf per lot for single family and 2300 sf per lot for the townhomes, plus paved roads and sidewalks. A relatively small amount of off -site storm water will be picked up in the storm water collection system and directed to the BMPs. Existing off -site impervious areas were estimated by aerial photography and included in the calculations for treatment. In addition to water quality, all three of the BMPs also function as detention basins to attenuate peak flows in the 2 year 24 hour and 25 year 24 hour storms. This is in accordance with Union County's local storm water ordinances. BMP drainage was sized for the 50 year 24 hour storm with 1 foot of freeboard in all of the BMPs. The responsible party will maintain the BMPs in perpetuity. Maintenance activities for the wet pond include monthly inspections and inspections within 24 hours of storm events greater than 1.0", establishing and watering plants on vegetated shelf, maintaining stabilized ground cover on dam and embankments, and annual inspection of dam by a dam safety expert. 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I /.tpy r r Y • sy�+(�• 4, i e ,k <�, a �* itUM t::�t,'�.l'$s,. ft� � .'t • i 15' nr :-%" (1.1L, r'5� ri_ North Carolina Elaine F. Marshall DEPARTMENT OF THE Secretary SECRETARY OF STATE PO Box 29622 Releigh,NC 27626-0622 (919)814-5400 Click Here To: View Document Filings File an Annual Report Amend a Previous Annual Report Print a Pre -Populated Annual Report form Corporate Names Legal: Harkey Creek (Charlotte) ASLI Vill, LLC Limited Liability Company Information Sosld: Status: Annual Report Status: Citizenship: Date Formed: Fiscal Month: State of Incorporation: Registered Agent: Corporate Addresses 1597802 Current -Active Current Foreign 5/25/2017 January DE CT Corporation System Reg Office: 160 Mine Lake Ct Ste 200 Raleigh, NC 27615 Reg Mailing: 160 Mine Lake Ct Ste 200 Raleigh, NC 27615 Mailing: 923 N Pennsylvania Ave Winter Park, FL 32789 Principal Office: 923 N Pennsylvania Ave Winter Park, FL 32789 Company Officials All LLCs are managed by their managers pursuant to N.C.G.S. 57D-3-20. KENNEY DESIGN GROUP, PA LETTER OF TRANSMITTAL To: Annette Lucas, PE Stormwater Engineer Division of Energy, Mineral and Land Resources Dept. of Environmental Quality 1612 Mail Service Center Raleigh, NC 27699-1612 RE: Harkey Creek Subdivision, Union County Date: July 18, 2017 We are sending you: Storm Water Management Permit Package Application fee check for $505.00 Annette, This is the project we discussed on the phone. Jeff Schmitt KI 1216 PARSONS TRAIL DENVER, NORTH CAROLINA 28037 PH: 704-634-7186 EMAIL: kenney@kenneydesign.com LICENSE NO. C-1986 KENNEY DESIGN GROUP, PA 1216 PARSONS TRAIL DENVER, NORTH CAROLINA 28037 PH: 704-634-7186 EMAIL: kenney(Qa kenneydesign.com LICENSE NO. C-1986 LETTER OF TRANSMITTAL To: Robert Patterson, PE Stormwater Engineer Division of Energy, Mineral and Land Resources Dept. of Environmental Quality 512 N. Salisbury St. 1612 Mail Service Center Raleigh, NC 27699-1612 RE: Harkey Creek Subdivision, Union County Project Number SW3170702 Date: August 22, 2017 We are sending you: • 2 sets plans with revised SCMEs. • Calculations for rip rap aprons for pond outlets. Jeff Schmitt Energy, Mineral & Land Resources ENVIRONMENTAL OUALRY August 9, 2017 Mr. Jeffrey P. Schmitt, PE Kenney Design Group, PA 1216 Parsons Trail Denver. NC 28037 Subject: Request for Additional Information Stormwater Permit No. SW3170702 Harkey Creek Subdivision Union County Dear Mr. Schmitt: ROY COOPER Covemor MICHAEL S. REGAN Secretary TRACY DAVIS Dirraor The Division of Energy, Mineral and Land Resources (DEMLR), received a Stormwater Management Permit Application for the subject project on July 20, 2017. A preliminary review of that information has determined that the application is not complete. The following information is needed to continue the stormwater review: Revise the SCM access & maintenance easements to include the whole SCM; down to the back toe of slope of the dams, and include the outlet and riprap apron. [General MDC 9]. 2. Provide supporting calculations for the pond outlet rip rap aprons to demonstrate they provide non -erosive flow for the 10-yr storm [General MDC 4]. 3. Provide pdfs of all revisions, and 2 hardcopies of revised plans. Pdfs must be uploaded using the form at: httlis:Hedoes.deg.nc.£ov/Forms/SW Project Submittal Please note that this request for additional information is in response to a preliminary review. The requested information should be received by this Office prior to September 9, 2017, or the application will be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including the application fee. If you need additional time to submit the information, please submit your request for a time extension to the Division at the contact below. The request must indicate the date by which you expect to submit the required information. The Division is allowed 90 days from the receipt of a completed application to issue the permit. Nothing Compares,.. SState of North Carolina I Environmental Quality I Energy. Mineral and land Resources 512 N. Salisbury Street 11612 Mail Service Center I Raleigh, North Carolina 276991612 9197079200 The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to enforcement action pursuant to NCGS 143-215.6A. Please reference the State assigned project number SW3170702 on all correspondence. If you have any questions concerning this matter please feel free to contact me at Robert.Patterson a,ncdenr.gov or (919) 807-6369. Sincerely, 4,xp 7.� Robert D. Patterson, PE Environmental Engineer Stormwater Program ec: Mooresville Regional Office Andrew Dubill — Harkey Creek (Charlotte) ASLI Vlll, LLC Nothing Compares State of North Carolina I Environmental Qnnllty I Energy, Mineral and Land Resources 512 N, Salisbury Street I Ibl2 Mall Service Center I Raleigh, Non Carolina 27699-1612 9197079200 '�w 317070 a- KENNEY DESIGN GROUP, PA LETTER OF TRANSMITTAL To: Robert Patterson, PE Stormwater Engineer Division of Energy, Mineral and Land Resources Dept. of Environmental Quality 512 N. Salisbury St. 1612 Mail Service Center Raleigh, NC 27699-1612 RE: Harkey Creek Subdivision, Union County Date: August 1, 2017 We are sending you: 1216 PARSONS TRAIL DENVER, NORTH CAROLINA 28037 PH: 704-634-7186 EMAIL: kenney@kenneydesign.com LICENSE NO. C-1986 RFC'E V/v ED AU8 0 81017 Sr RMWAERPQRM;,r,NG t'o• Supplement- EZ Form O0�S • Original signature pages for SWU-101 and O&M Agreement' / ! l OOP' d4a Fey 2 9P �d, 1p 0°d'd/10 'CP Jeff Schmitt KENNEY DESIGN GROUP, PA 1216 PARSONS TRAIL DENVER, NORTH CAROLINA 28037 PH: 704-377-6099 EMAIL: ken ney@kenneydesign.com LICENSE NO. C-1986 Harkey Creek Subdivision Union County, North Carolina CA "' �Nunu11q<. �FE93/OyI SEAL T- #18,998 1—/zzj lv BMP 7 Calculation Revisions t 01- cd. 'c0 RECEIVED JUN 19 2019 DI±�iR,�AND S�fiORkjyATERQUAli� ,PE AL N r. Wet Pond Calculations Drainage Area = 9.90 ac CN = 86 Tc= 0.08.hrs Impervious Area = ` .=, 4.92.ac 1= 50% Rv = 0.50 WQv = 0.41 ac-ft WQv= 17870 ft3 Stage at Treatment Vol = 646.8 Permanent Pool Elev. = 646.0 Vpp = 55699 ft3 APp = 16677 ft2 Dave = 3.34 It Min SAIDA Ratio = SA = DA = SAIDA Ratio Provided = Main Pool Volume = Required Forebay Volume = Forebay Volume Provided = Orifice Sizing Time to release WQv = Release Rate = Average Head = Orifice Area = Orifice Diameter = 1.79 0.38 ac 9.90 ac 3.87 55699 ft3 8355 ft3 10274 ft3 48 hrs 0.103 cis 0.4 ft 0.034 ft2 2.50 in Project: BMP 7 Wet Pond Date: 15-Jun-17 Rev 15-Mar-18 Post Development Soils = Group C CN = 98 CN = 74 CN = 70 CN = 85 Water Quality Volume Water Quality Volume to 11140 ft3 642.5 to 646 4.92 ac 4.98 ac 0 ac 0 ac Imperv- Total Grass, good Woods, good Gravel 1 Project Drainage Areas— Additional Sheet riR)n `SWLI lC( Basin Information Drainage Area 5 Drainage Area 7 Drainage Area 8 Receiving Stream Name East Fork East Fork East Fork Twelevemile Twelevemile Twelevemile Creek Creek Creek Stream Class C C C Stream Index Number 11-138-2 11-138-2 11-138-2 Total Drainage Area (sf) 414255-63914- 143%tZ'+'i' 96267 On -site Drainage Area (sf) 364265 463%* `t'"7l L•}+I- 86684 Off -site Drainage Area (sf) 49990 9583 Proposed Impervious Area (sf) 134291 392559 Zi4, V15 29115 % Impervious Area 34 -47-- 50 30 Impervious Surface Area On -site Building/Lots (SO 85050 442t ' ! `tC', a- 18900 On -site Streets (sf) 36741 63559 yCj , jy 5j 7835 On -site Parking (sf) On -site Sidewalks (sf) 12500 1 7-58, iB, `FG 2380 Other on -site (so Future (sf) Off -site (so 6000 9583 Existing BUA (sf) Total (so 140291 4H569 'ZIL}7'L'1�j 38698 i+1P' I ��„ist�Ny 4$ftyr 3 1 \ I \ I I F FFIGI �L� (All UN/ON -,&7- 0-7� KENNEY DESIGN GROUP, PA • 1216 PARSONS TRAIL DENVER, NORTH CAROLINA 28037 PH: 704-634-7186 EMAIL: kenney@kenneydesign.com LICENSE NO. C-1986 May 21, 2018 Sck m' Rick Riddle, PE 'boo^ld'a'6F L j Environmental Engineer `Os NCDE_,Q hiP ai F� F DEMLR Stormwater Program `°Rio sc�P 512 N. Salisbury Street �0'/0O 1612 Mail Service Center e� Raleigh, NC 27699-1612 RE: Harkey Creek Subdivision, Union County, Permit o. SW3170702 Revisions to Wet Pond #7 Dear Mr. Riddle: We have made some revisions to the street and lot configuration of the Harkey Creek Subdivision. These revisions only affect Wet Pond #7. The revisions will reduce the drainage area to the pond by 0.75 ac (from 10.65 ac to 9.90 ac) and reduce the impervious area by 0.10 ac. The pond itself has been slightly altered. No changes have been made to the outlet device. Attached are revised plans and calculations for the Wet Pond #7. Please let me know if you require any addition information. Thank you. Sincerely, Jeffrey P. Schmitt, PE DECEIVED JON 19 2018 DENR.LAND DUALITY STORMWA7ER PMmIrMIS