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Floodplain- PT140520 T H E C 1 T Y O F COPPELL .A_s.� FLOODPLAIN DEVELOPMENT PERMIT PERMIT NO.Zoi'I ocZo4g NAME OF PERMITEE: Atmos Energy The above named permitee applied for a FLOODPLAIN DEVELOPMENT PERMIT on S/20 I l t"I The application has been reviewed by the FLOODPLAIN ADMINSTRATOR and it has been determined that the proposed development is located within an identifiable floodplain of: The FLOODPLAIN ADMINISTRATOR has reviewed plans and specifications of the proposed development for conformance with the development standards required by Floodplain Management Ordinance #2001-952. You are hereby authorized to proceed with the following described work: 4 i o flp c,sza& pto-k 4 A4s 044(...4 ' PIms To maintain compliance with the development standards of Floodplain Management Ordinance #2001-952 and to eliminate or minimize flood damage potential to the proposed development, you are hereby directed to construct your proposed development in accordance with the following special provisions: ( ) Compliance with the development standards of Floodplain Management Ordinance #2001-952 including but not limited to: • For residential structures, the lowest floor (including basement)must be elevated to two(2) feet above the 100- year base flood elevation or one (1) foot above ultimate condition whichever is higher. Certification of the lowest floor must be submitted from a registered professional engineer, architect, or land surveyor. • For non-residential structures, the lowest floor (including basement) must be elevated or flood-proofed to two (2) feet above the 100-year base flood elevation or one (1) foot above ultimate condition whichever is higher. Certification that the flood-proofing methods are adequate to withstand the flood depths, pressure, velocities, impact and uplift forces and other factors associated with the base flood must be submitted from a registered professional engineer or architect. • For fill activities, the permittee must submit certification from a registered professional engineer or land surveyor that the level of the compacted fill materials is at or above the elevation of the Base Flood. ( ) Certified copy of all final plans or As-Built Drawings must be submitted to the FLOODPLAIN ADMINISTRATOR. ( ) OTHER PROVISIONS: /1`A "Zi � Gary Woolsey Apr 1, 2014 Acknowledgement of Conditions by Permittee A f Printed Name Date n .*• LOODPLAIN ADMINISTRATOR Printed Name Da e Michael Garza From: Marcel Estay <mestay@submar.com> Sent: Tuesday, April 01, 2014 9:39 AM To: Michael Garza Cc: Scott Latta; bclark@submar.com; Mary.Johnson@atmosenergy.com; gary.woolsey@atmosenergy.com Subject: RE:floodplain permit Attachments: 11111 Floodplain Development Permit.pdf; 11111 Drawings.pdf; 11111 Maps& Photos.pdf Mr.Garza, Thank you for discussing the referenced project with me this afternoon. Please see the below project narrative and the attached floodplain development permit form, project drawings, and maps and photos document. An Atmos 24-inch pipeline's(Line W) 50-foot right-of-way crosses Grapevine Creek in Dallas County, Coppell,Texas (32.95539, -96.97839). The project site is north of East Belt Line Road and west of South Moore Road. Immediately surrounding the site are open fields and trees.This particular segment of Grapevine Creek flows in a westerly direction as it bisects the pipeline right-of-way.The soil in the area is silty clay and is highly erosive. Both banks are vegetated,and trees are beginning to fall into the creek. The right-descending bank is undercut and is extremely unstable. The average height of both the right-descending bank and the left-descending bank is approximately 16 feet.Additionally,there is a large amount of woody debris in the creek, and due to a high flow event, a large concrete footer and post were deposited just upstream of the pipeline. Approximately 500 feet downstream of the site, a large section of the right- descending bank has collapsed and is draining the pond. Upstream of the pipeline, a gravel bar has formed at the toe of the left-descending bank. At one time, approximately 30 feet of the pipeline was exposed; however,the right- descending bank has sloughed, covering a section of the pipeline. Line W is now exposed across the creek bed for approximately 20 feet. Atmos proposes to armor the pipeline with a system of articulating concrete mattresses for the entire distance that the pipeline runs across the creek to both stabilize the banks and cover and protect the exposed pipeline.The sloughing banks will be cut back to create gentle,stable slopes within the project area.The gravel bar will be cut, and fill will be placed over the exposed pipeline and a section of the right bank. The freshly graded creek will be covered with a geotextile material and then Submar mattresses. The mats will extend from the high bank, across the creek bed, and up to the opposite high bank. The mats will be anchored into the high bank elevations in excavated termination trenches to prevent flanking of the system. The upstream, leading edge of the mattress system will also terminate into an excavated 3-foot deep anchor trench. The upstream anchor trench will be backfilled with stone to prevent flanking of the mat system and scour. Longitudinal Peaked Stone Toe Protection (LPSTP)will be placed along the right-descending bank to prevent the bend from migrating and potentially flanking the proposed mat system. The LPSTP will consist of well- graded riprap installed along the toe of the right bank and will prevent scouring of the toe. LPSTP is used to protect the toe of the stream banks from being eroded by water passing through the stream. The keys(the rock that is placed up the banks in an excavated trench) are put in place to deflect the water away from the bank to prevent water from flanking the mattress system.The mat tail on the downstream end of the mat system will protect against the advance of future headcuts that attempt to move upstream. Submar's articulating concrete mat system, along with the LPSTP,will provide and maintain cover over the pipeline and will stabilize the banks within the matted area. LPSTP is a method of bank stabilization developed and used by the U.S.Army Corps of Engineers(USACE). The rock or crushed concrete is mounded at the toe of the slope where the bank erosion process usually begins. The toe is held firm by the mass of rock and the upper bank above the rock is allowed to re-vegetate and become stable by the root systems 1 holding the upper bank area. This method is encouraged by the USACE and the U.S. Fish and Wildlife Service due to the natural stream appearance and the creation of riparian habitat. The Submar Revetment Mattress is an articulating concrete mat used primarily for erosion control. The mat is 4.5- inches thick and has a low hydraulic profile when placed in a streambed. Pipeline companies prefer our mats to protect their pipelines for several reasons. If the stream undergoes significant changes,the mats can be repositioned to compensate for changing flow patterns. The mat has open areas that allow revegetation through the mat. The design for matted areas includes a rapid return to a natural appearance. The proposed project has been designed to restore cover to the exposed pipeline with minimal impact to waters of the United States. The proposed project involves the installation of 21 articulating concrete mats over the exposed pipeline and upstream rock to restore cover and stabilize approximately 175 linear feet of eroding bank. Of the 21 total mats proposed, 6.8(10.2 cubic yards)will be installed below the ordinary high water mark(OHWM). About 11.3 cubic yards of clean uncontaminated native fill,and 6.3 cubic yard of rock will be placed below the OHWM.About 18.5 cubic yards of rock associated with the LPSTP will also be placed below the OHWM . It appears that the project may permanently impact about 0.03 acre of waters of the United States. It is anticipated that no wetlands will be impacted. We expect temporary impacts during construction; however, anticipate no long-term adverse impacts to the project area. Based on review of the Corps of Engineers Regulatory Program,the proposed work at the site appears to meet the criteria established for authorization under Nationwide Permits (NWP) No. 3—Maintenance, as found in the February 21, 2012, Federal Register, Reissuance of Nationwide Permits(77 FR 10184). Atmos will comply with the general and regional conditions of the permits during construction. Please do not hesitate to contact us with any questions or concerns. Thank you, Marcel Estay Environmental Permits Specialist cli It 57.1,...114 7L0.+4:* Office: 800-978-2627 Fax: 985-851-0108 805 Dunn Street Houma, Louisiana 70360 www.SUBMAR.com PRIVILEGED AND CONFIDENTIAL: PROTECTED COMMUNICATION;CUSTOMER-CLIENT WORK PRODUCT Do not read,copy or disseminate this message or any attachments unless you are the intended recipient. The information contained in this electronic message may contain attorney-client privileged and confidential information intended only for the use of the owner of the email address listed as the recipient of this message.If you are not the intended recipient of this e-mail message you are hereby notified that any disclosure,dissemination,distribution,or copying of this communication is strictly prohibited.If you have received this email in error,please immediately notify the sender by replying to this message,and then permanently delete the original and any copy of this email and any printout thereof. Thank you. 2 From: Michael Garza [mailto:MGarza@coppelltx.gov] Sent: Tuesday, March 25, 2014 5:09 PM To: Marcel Estay Cc: Scott Latta Subject: floodplain permit Please fill out the form and submit a location plan of the area you will be working. Thanks, Michael Garza, P.E. Assistant Director of Engineering Engineering Department City of Coppell, TX www.coppelltx.gov 972-304-7019 (office) C FFELL In7rai 1 �c- Please take our customer service survey 3 A-v�.., �. O :Qb- CUAT$_ Y ❑ ri�Rz Y \J� ; N 'rMitiHARRI9DN D0. ❑ 2 -:::;,),--N.., r• h. 1ti w % <N w, co ry r n —11 1- O x N D r -c ❑ Vt.:. z .,(LQ to Cowboy Sta. L- O rz r -< n-m �. F '... x ,:„.„, • r , rn q m ! tx �..� \ - �• v5—.-SPYG1A55 !� r 1. .... ,,, �It { a. rn o O p tiff+ `� N _ m , ,, ,„, n L ,,,, wIliow o f z n. o < r z z ___=_ �' Pje, r100IdL1U}i7 Cd: , N ���- . A Z J{ CLi —�z o vii tANCT 11 • J g N `` w U C3!I r_ EL , c, SHADY OAKS RD o h �L�.� C O{�� 4 — r� L w _ v I.� �NDY AICF RD�i 1:SAI _ RU J. 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TF E BELT LINE 11(3.-,,1' I RI. NI'`DO �� ti to m Q H C�e 0.- -_r � ti F' Y� LL w Gf 9� L t Z Bio � yo Cj, (4, JE tiF-1,01 ,s,:14_,, .., ...I ___. O f �,q f " t WRANGLER DR North TlO min o — [ I Lake is l N0!\O r ,r'' . r- ► ", w ❑i re o s. `a' t e= : 44SS117T z ❑ z I CSR pi ro! a o� STA c) S1 40"1? II4 .4PLL Z3 -L'-''' 1 � ) lh. O fip R P ,:aN ZRNp?9R O� ,r: O kv� p i * 5 o �Q �� P' r+.'"\ C \'�° Y 0 800 1600 2400 3200 4000 aQ . 4� 1y ata Zoom hcrth Lake Park .1/ P j �Li'11 '�1 I_. PROJECT TITLE: 805 Dunn Street Houma,LA 70360 Grapevine Creek ir Phone:985-868-0001 Fax:985-851-0108 Dallas County, Coppell, Texas Email.submar@submar.com N32.95539°, W 96.97839° energy- Website:www.submar comyy.„r/•,,,,- SOURCE:©2011 DeLorme.Street Atlas USA®2011 Plus DRAWING NO.:11111 I DATE:03/12/2014 SHEET TITLE:Vicinity Map I SHEET:Figure 1 mow -.N., 40.. . ii ARei ' `e ` �1t 3te ti r + 1. ' ,. 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Website:www.submar.com 5.7.4-77 niiaiiii SOURCE:USGS 7.5 Minute Topo,"Carrollton,TX". DRAWING NO.:11111 I DATE:03/12/2014 SHEET TITLE:Topo Map I SHEET:Figure 2 Map dated 2012. Of. f, / • _ 7,1 cirLI, , 1....) iI Il P -I= E3ethea-School-Rd - n/Tead0. r {, 4' ----"T#7.------‘' - —1- r{ �i . q� .+� p ->+ z f 4,, yam"'1 o ;f f u� �C ta, t11 '' � __X' h.- e00,,, � � _ , 32.95539 N, 96.97839;,W ek R-d, �r43e11-Line Rd '-b., S-No•--thlake-Rd qtr ;a cc fil . _ .; 1 0 . : .> • f pi A - '. �� r41._• dynatTlQ'[ar ..,- 1, : 1..44* * rr" ° . 4. Via. t. 0 2013 Google '' '. 1204 it a PROJECT TITLE: 805 Dunn Street Houma,LA 70880 Grapevine Creek c� Phone'985-868-0001 %Jl :w.d/ ;_ Fax:985-851-0108 Dallas County, Coppell, Texas AT MOS Email:submar@submercom N32.95539°, W 96.97839° energy. Website:www.submarcom Cr.,7 .dtr -- SOURCE:Google Earth,2013 Imagery DRAWING NO.:11111 I DATE:03/12/2014 SHEET TITLE:Aerial Map I SHEET:Figure 3 ^sem "4.4 �. .t ,bs r.=• w y,Sfv d. ":14*. r.,'";,:' , s Photo 1: Pipeline exposure • y l�`�r py \a• j( t s^ rJ +� !� r A - ,_ h,. L" faNtL M 441:',.;44$ -r •'• 41 .I t $ i i4 iCa f •ter t4� r, . * x,1i / , ' 1. .. li _t 5. 1' ��' •' ,,. ` f. T� n'•u ay Y �, • -rel`y y ,o- 1� v ^•� •ti`s t. • 1. t. Photo 2: Looking downstream PROJECT TITLE: 805 Dunn Street AtelOS Houma,LA 70360 Grapevine Creek Phone: 1-010801 ► T Fax:985-851-0108 /� Dallas County, Coppell, Texas Emallsubmar@submaccom �J N32.95539°, W 96.97839° energy. Website:www.submaccom y7 ter., SOURCE:Site Visit January 22,2014 DRAWING NO.:11111 I DATE:03/12/2014 SHEET TITLE:Site Photos I SHEET:Figure 4 .a' ;r. i K q ,. r.+ ,c4;t!.1„ ,, Photo 3: Looking at right descending bank I I s+ r i • ek I _ -I, .4_F l', „i;',V!' i r yf '" R #�$ `e tea. A f :. , .., C . „,,,, T,,. ;:,‘,.-,,-,-,T,..`,y4. y. ..:: 7 ,. f r $�: '° T a , iva° Photo 4: Looking upstream PROJECT TITLE: 805 Dunn Street Houma,LA 70360 Grapevine Creek ATIPAOS Phone:985-868-0001 a°t '.„:'7.4 Fax:985-851-0108 Dallas County, Coppell, Texas Email:submar@submar.com N32.95539°, W 96.97839° energy. Website:www.submaccom i�,,y7,..urt¢»«- SOURCE:Site Visit: January 22,2014 DRAWING NO.:11111 I DATE:03/14/2014 SHEET TITLE:Site Photos I SHEET:Figure 5 :an) t4.) "er, L., 0) °) 0/ ,fr/ o % 3 2 p, ijir'' t' IQ0/ 0C3 I 0 0 0 0 0 N O N 0 CC �y� N �CvI; a) a 3 0 /'' z W 0 ; e> Luk i 1 lz*-2U - / • • #lill /• ,, '4/ 0 2 0 ./.- 0 /' II e o / / W /.0 , • \../ ct...1.- N O po i /• '/0 ,/• t.0p ii 0 <CaU i /C) /• O ,• ;, / 0 , 14 F, / /• ' t� 0 2— 4,,../� 0 1 !ii 0 ,IT ih ;on, in ,....v s z3 (i),�o aaoZS �S a 0 0 S j O WW [��^ N 3 a. , • J 14, / ` o ••ee 1-Lrt § 1 1 ../ \ 0 Mit / X • i I/ 1 0 25 0 V NAN\ , ::\ • . CN 10 \ 'I. Vet;: Ir \:1,....:::\ NN �� R Z1.... 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