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AESA20-0004b
S:\Legal\Our Documents\Ordinances\20\AESA20-0004 - Ryan High School.Docx ORDn,IANCENO AESA20-OO04b AN ORDINANCE OF THE CITY OF DENTON, TEXAS APPROVING AN ALTERNATIVE ENVIRONMENTALLY SENSITIVE AREA PLAN FOR APPROXIMATELY 78.904-ACRE PROPERTY, GENERALLY LOCATED ON THE NORTH SIDE OF EAST MCKINNEY STREET, APPROXIMATELY 1,740 FEET EAST OF THE INTERSECTION OF MAYHILL ROAD IN THE CITY OF DENTON, DENTON COUNTY, TEXAS; ADOPTING AN AMENDMENT TO THE CITY’S OFFICIAL ENVIRONMENTALLY SENSITIVE AREAS MAP; PROVIDING FOR A PENALTY IN THE MAXIMUM AMOUNT OF $2,000,00 FOR VIOLATIONS THEREOF; PROVIDING A SEVERABILITY CLAUSE AND AN EFFECTIVE DATE. (AESA20-0004) WHEREAS, Teague NaII and Perkins Engineering, on behalf of Denton Independent School District, have applied for an Alternative Environmentally Sensitive Area (ESA) Plan on an approximately 18.83-acres of land as described in Exhibit “ A“ and depicted on the map provided on Exhibit “B,” herein by reference (the “Property”); and WHEREAS, the purpose of the Alternative ESA Plan for the Property, attached as Exhibit “C,” is to mitigate encroachments for infrastructure that would support the development across an existing Riparian Buffer and an existing Undeveloped Floodplain ESA; and WHEREAS, on September 2, 2020, the Planning and Zoning Commission, in compliance with the laws of the State of Texas, gave requisite notices by publication and otherwise, afforded a full and fair public hearing to property owners and interested citizens, and recommended approval with conditions (7 -0) of the Alternative ESA Plan on the Property; and WHEREAS, on October 20, 2020, the City Council likewise conducted a public hearing as required by law, and finds that the request satisfies all substantive and procedural standards set forth in Section 2.8.4 of the 2002 Denton Development Code, and is consistent with the Denton Plan and the Denton Development Code; and WHEREAS, the Planning and Zoning Commission and the City Council of the City of Denton, in considering the application for an Alternative ESA Plan for the Property have determined that the proposed use for the Property is in the best interest of the health, safety, morals, and general welfare of the City of Denton, and accordingly, the City Council of the City of Denton is of the opinion and finds that said Alternative ESA Plan is in the public interest and should be granted as set forth herein with respect to the Property; NOW THEREFORE, THE COUNCIL OF THE CITY OF DENTON HEREBY ORDAINS: SECTION 1. The findings and recitations contained in the preamble of this ordinance are incorporated herein by reference and found to be true. SECTION 2. The Alternative ESA Plan for the Property is hereby approved with the following conditions: 1. 2. 3. 4. Land disturbance within the Riparian Buffer ESA is limited to 1.195 acres for the installation of storm water drainage infrastructure. The detention basin shall be designed and constructed to meet the minimum drainage standards as set forth by the City of Denton Stormwater Design Criteria Manual with an additional 0.91 acre-feet of Water Quality Volume. The property owner shall maintain the detention basin by following the maintenance plan provided in the Alternative ESA Plan. Vegetation established as a part of the proposed revegetation plan are to be seeded and maintained by the current property owner/developer for a period of three (3) years following installation. Any plants that are removed, destroyed, or die within that three (3) year period are required to be replaced by the current property owner/developer to achieve a minimum 90% survival rate. Following the installation and inspection of the revegetation, the property owner shall submit an annual report to the Environmental Services Director during the first three (3) years describing the cumulative mitigation work performed and the survivability of the plantings for staff review and inspection. 5. SECTION 3. The City’s official ESA map is hereby amended to show the change in the Alternative ESA designation and classification for the Property. SECTION 4. If any provision of this ordinance or the application thereof to any person or circumstance is held invalid by any court, such invalidity shall not affect the validity of the provisions or applications, and to this end the provisions of this ordinance are severable. SECTION 5. Any person, firm, partnership or corporation violating any provision of this ordinance shall, upon conviction, be deemed guilty of a misdemeanor and shall be punished by fine in a sum not exceeding $2,000.00 for each offense. Each day that a provision of this ordinance is violated shall constitute a separate and distinct offense. SECTION 6. That an offense committed before the effective date of this ordinance is governed by prior law and the provisions of the Denton Code of Ordinances, as amended, in effect when the offense was committed and the former law is continued in effect for this purpose. SECTION 7. In compliance with Section 2.09(c) of the Denton Charter, this ordinance shall become effective fourteen (14) days from the date of its passage, and the City Secretary is hereby directed to cause the caption of this ordinance to be published twice in the Denton Record- Chronicle, a daily newspaper published in the City of Denton, Texas, within ten (10) days of the date of its passage. Page 2 of 3 The motion to approve this ordinance was seconded by the following vote [ a- U : made by le the ordinance Gas p:9 X and Id approved by Aye 7 ,/ V/ Nay Abstain Absent Mayor Chris Watts: Gerard Hudspeth, District 1 : Keely G. Briggs, District 2: Jesse Davis. District 3 : John Ryan, District 4: Deb Armintor, At Large Place 5 : Paul Meltzer, At Large Place 6: V/ +£ r ,Z lay of aPASSED AND APPROVED this, the 2020 /\ nRB–W-xTffMa6i ATTEST: ROSA RIOS, CITY SECRETARY BY, Ja APPROVED AS TO LEGAL FORM: AARON LEAL, CITY ATTORNEY Page 3 of 3 STATE OF TEXAS DEDICATION COUNTY OF DENTON WHEREAS, DENTON INDEPENDENT SCHOOL DISTRICT is the owner of all that certain tract of land situated in the U. Forres+ Survey Abstract Number 417, Denton County, Texas and being all of Lat I-R(4), Block A, Denton High School #2 as shown by the AmendIng Plat thereof recorded in Document Number 2009-93 of the Flat Records ai Denton County,Texas and the called 6.349 acre tract d8scdb8d in the dead to Denton I.S.D. recorded in Volume 649, Page 178 of the Deed Records of Denton County, Texas; the subject tract being more par+tculcrly described as follows: BEGINNING for the Northeast Corner of the tract beIng dBScrib6d herein at a 1/2 inch iron rod found at the monumentod Northeast Corner of the said Lot I-R and beIng in the West line of the Meadows Addition, as shown by the plat thereof recorded in Cabinet C, Pages 60-61 of tho Plat Records of Denton County, Texas: THENCE South 00 Degrees 54 Minutes 43 Seconds West with the West IIne of the Meadows Addition and the East line of Lot 1-R(4) a distance of 2.323.22 feet to a 1/2 Inch Iron rod with a yellow plastic cap stamped ”COLEMAN RPLS 4001 - set (hereinafter referred to as 1/21RS) for the Southeast corner thereof on the dedicated North rIght-of-way line of East McKInney Street (FM 426) from which a 1/2 Inch Fran rod found bears South 00 Degrees 54 MInutes 43Seconds West a distance of 22.2 feet; THENCE Westerly with the South line of Lot the following four calls: 1-R(4) and the dedicated Narth right-of-way line of East McKInney Street 1. North 62 Degrees 48 Minutes 15 Seconds West a distance of 35.07 feet to a 1/HRS: 2. North 63 Degrees 2D Minutes IS Seconds W8st a distance of 418.39 feet to a 1/2iRS: 3. North 66 D8grees 53 Minutes 26 Seconds West a distance of 357.95 feet to a 1/HRS: 4. North 70 Degrees 09 MInutes 07 Soconds West a distanca af 396.43 feet to a t/21RS for the Southwest corner of Lot I-R(4) from which a 5/8 inch Iron rod with an aluminum cap found bears South CO D8gr8eg OO Minutes OBSeconds East a distance of 18.6 feet; THENCE North CD Degrees 00 MInutes 08 Seconds West wIth the West IIne of Lot 1-R(4) a dFstance af 607.48 feet to a 1/21RS for a r8entrant corner thereof and the Northeast corn8r of the tract of land described in the deed from RodneyG. Dupree of ux to Wade G. Lillie et ux recorded in Volume 92 C), Page 393; THENCE Westerly with the South IIne of Lot t-R(4) the followIng fIve calls: t . North 67 Degrees Dl Minutes 16 Seconds West a distance of 221.00 feet to a 1/2 inch Iron rod found; 2. South 00 Degree8 24 Minutes 29 Seconds West a distance of 85,92 feet to a I/aRs; 3. North 74 Degrees 53 MinutBS 17 Seconds West a distance of 55.96 feet to a 1/2tRS; 4. North 73 D8grBos Q6 Minutes 47 Seconds West a distance of 255.75 feet to a 1/2 Inch Iron rod found; 5. North 73 Degrees 02 Minutes 04 S8conds West a distance of 198.96 feet to a 1/21RS for the Southwest Lol I -R(4}; corner of THENCE North 00 Degrees 53 Minutes 52 Seconds East with the West line of Lot t -R(4) a distance of 1, 121.56 feet to a t/2 inch iron rod found at the Nadhwest corner th8r60f and tho Northeast corner af Lot 1, Black A, DISD HayhiilServIce Center AddItion as shown by tho plat thereof recorded in CabInet O, Pogo 195 of the said Plat Records andbeing in the South line of the said 6.349 acre tract THENCE North 88 Degrees 23 Minutes 23 Seconds West wIth the North IrIe of the saId Lat I, Block A and the South IIneof the 6.349 care tract a distance of 157.75 foal to the Southwest corner thereof ; THENCE North 00 Degrees 37 MInutes 54 Seconds West along a wIre fence with the West IIne of the 6.349 acre tractpassing at a distance of 427.22 feet a t/2 inch iron rod found for reference on tho South SidB of Hills Road and continuing along the same course, in all, a total distance of 464.00 feet to the Northwest corner thereof in Mills Road: THENCE South 88 Degrees 38 Minutes 09 Seconds East distance of 608.02 feet to the Northeast corner thereof ; along Hills Road with the North line of the 6.349 acre tract a THENCE South al Degrees IS Minutes 27 Seconds West with the East line of the 6.349 acre tract passIng at a distanceof 15.6 feet a 1/2 inch iron rod found for reference on the South side of Hills Road and continuing generally along a wood fence along the same course, in all, a total distance of 464.78 feet to a 1/2 Inch Iron rod found at the Southeast corner of tha 6.349 acre tract in the North Rna of Lat t -R(4): THENCE in an Easterly direction wIth the NorIh Une of tnt 1-R(4) the following six calls: 1. South 86 Degrees 15 Minutes 43 Seconds East a di9tance cf 8.94 feet to a 1/2 inch iron rod found; 2. South 88 Degrees 49 Minutes 49 Seconds East a dIstance of 249.13 feet: 3. South 88 Degrees 58 MInutes 08 Seconds East a distance of 234.06 feet: 4. South 89 D8gr88s 14 Minutes 10 Seconds East a distance of 218.61 feet: 5. South 89 Degrees 25 Minutes 17 Seconds East a dIstance of 255.85 feet to a fence corner post:6. South 89 Degrees 10 Ylnute3 35 Seconds East a distance of 418.22 feet to the PLACE OF BEGINNING enclosing 78.904 acres (3,437,038 3quara feet) of land; and 8 hILDae P.R. 808 AESA20-0004 a(IUbZIU aE-a 8 rFe'v&eh'X De :gAiLlegZ MOkSE g- I 1Iltnp engineers surveyors landscape architects September 2020 Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center DENTON, TEXAS INDEPENDENT SCHOOL DISTRICT Prepared by: Teague NaII and Perkins, Inc. 5237 N. Riverside Drive, Suite 100 Fort Worth, Texas 76137 1 81 7.336.5773 phone www.tnpinc.com Texas Board of Professional Engineers and land Surveyors Engineering No. F.230 1 Surveying Firm No. 10011600 1 10194381 1 10011601 Georgia Board of Professional Engineers, Firm No. PEF007431 £tnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton. TX Alternative Environmentally Sensitive Area (AESA) Report (AESA20-0004) September 2020 For Compliance with: City of Denton Environmentally Sensitive Areas Assessment ESA20-0007 Prepared by: Teague NaII & Perkins, Inc. 5237 N. Riverside Drive Fort Worth, TX 76137 Prepared for: Denton Independent School District 1 307 N. Locust St. Denton, TX 76201 August 2020 Page 1 1 Atnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX TABLE OF CONTENTS TABLE OF CONTENTS........................................................................................................... 2 I INTRODUCTION............................................................................................................ 3 2 EXISTING SITE ............................................................................................................... 3 2.1 2.2 2.3 ESA Assessment...................................................................................................................................................... 3 Riparian Buffer ...................................................................................................................................................... 3 Cross Timbers Upland Habitat .....__________.___.____________..____________________.___._______.. 3 PROPOSED SITE .................................._........................................................................ 43 3.1 Riparian Buffer Impacts _____________._____________________..._____________________.__________ 4 3.2 Cross Timbers Upland Habitat Impacts __________.____.___.______________________________..____. 4 3.2 Mitigation Activities .____________.__________..___.____._________________________.__._____..___._. 4 4 ANNUAL REPORTING...................................................................................................5 5 SUMMARY ........_..........................................................._............................................. 5 6 APPENDIX..................................................................................................................... 6 6. 1 6.2 6.3 6.4 AESA Exhibit ______.______.________._______.____..___._..__________.___________________._______. 6 Water Quality Volume (WQv) Calculations .____.._________________________________________._... 7 Landscape Plan .___„_________..._...___________.__________.__.______._.__.___________._____._____ 8 Riparian Buffer Assessment................................................................................................................................. 9 Cross Timbers Upland Habitat Assessment .___________..__________________.__________.________.23 Planting List ._______________________________.__.____.__________________________________.___.28 6.5 6.6 September 2020 Page 1 2 1IltrIP engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX 1 INTRODUCTION Teague NaII & Perkins Inc. was retained by Denton ISD for civil engineering services for the Ryan High School – Additions & Renovations as well as the Denton ISD – Main Transportation Center Parking Improvements. This alternative environmentally sensitive area (AESA) plan is being submitted to the City of Denton to request approval for impacts to the existing Environmentally Sensitive Area (ESA). This AESA proposes some of the ecosystem services offered by a riparian buffer located onsite to be relocated to a proposed detention pond within the DISD property. 2 EXISTING SITE The Ryan High School site is located iust east of the intersection of S. Mayhill Rd and E. McKinney St. at 5101 E. McKinney St, Denton, TX 76208. The site consists of a main high school building with accompanying accessory buildings and parking throughout. The site also contains competition and practice athletic facilities along the north, east and south property lines. The Denton ISD Main Transportation Center can be found in the northwest corner of the high school lot. Vegetative ground cover is scarce within the site and is mainly found at the perimeter to the property. 2.1 ESA Assessment On February 1 7th, 2020 an ESA Field Assessment (ESA20-0007) was completed for the entire lot as well as the Denton ISD property north of the Main Transportation Center. From this report, it was concluded that 2 ESAs are present on the site. 2.2 Riparian Buffer Along the southern property boundary adjacent to E. McKinney St., a portion of the tributary to Pecan Creek was delineated as a riparian buffer. This riparian buffer’s main purpose is to intercept pesticides and fertilizers. Along the banks of this buffer, the major existing species found were Southern Cattail, Slender Spikerush, Curly Dock and Johnson Grass. Within the buffer, the major species found were Pot Oak, Bermuda Grass, Mixed Upland Forbs, and Mixed Upland Grasses. The field assessment returned an RSAT score of 23, earning the overall buffer a 'fair’ designation. As part of this score, channel stability and water quality scored excellent grades, while riparian habitat conditions and biological indicators scored poor grades. Per our analysis, this buffer’s water quality volume would equal 0.01 ac-ft. 2.3 Cross Timbers Upland Habitat Along the west property boundary, directly adjacent to the existing transportation facility, a non-continuous area of 0.1 0 acres was delineated as a cross timbers upland area. One of this environmental area’s purposes is to serve as a mitigation for climate and air quality in urban areas. The main species found in this area are Post Oak, Blackjack Oak and Chinese Privet trees. There is also Rough Green Briar that is found throughout. September 2020 Page 1 3 Atnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX 3 PROPOSED SITE The proposed improvements to the Ryan High School site include a building expansion, parking lot expansion, various athletic facilities improvements and utility improvements. 3.1 Riparian Buffer Impacts The current storm drain system, whose outfall is at the most upstream portion of the buffer, was observed to have failed. The result of this is a headwall flowline elevation higher than upstream sections of the system. This has caused the drainage system to function insufficiently. The required corrective measures include extending the storm drain line 1 20’ into the existing riparian buffer in conjunction with constructing a 1 35’ concrete pilot for the bottom of the swale. These drainage improvements negate the effectiveness and functionality of the riparian buffer. 3.2 Cross Timbers Upland Habitat Impacts An existing detention pond directly adjacent to this area is to be expanded upon in order to adequately detain runoff from the proposed parking improvements. This expansion was designed with the existing ESA in mind and does not impact the area delineated as existing ESA. 3.2 Mitigation Activities Due south of the transportation center, an existing dry detention pond will be improved to accommodate the increased runoff as a result of the parking lot improvements along Mills Road. The proposed modification has been designed to enhance the pond to accommodate the replacement of the main services the existing riparian ESA provides. While this is part of a dry detention pond, the bottom of this pond will be saturated in the 1 -year storm and will also see the conveyance of runoff from all smaller scale storms as well which will aid in the natural sustainability of the vegetation within the pond. The vegetation proposed for the bottom of the pond is a mix of native grasses from Native American Seed Company and includes Big Bluestem, Cereal Rye Grain, Eastern Gamagrass, Green Sprangletop, Prairie Wildrye, Switchgrass, White Tridens, Broomsedge Bluestem and Bushy Bluestem. In addition to the species of vegetation used, we are also promoting infiltration of runoff to increase the sustainability of the vegetation by reducing the slope to iust above 1 % while maintaining an earthen flow pattern. The combination of different aspects of this proposed pond expansion will promote the intercepting of fertilizers and pesticides prior to reaching any downstream water courses. From this design, we have exceeded a direct mitigation of the water quality volume being removed. The existing buffer has a water quality volume (WQv) of 0.01 ac-ft. The WQv required for proposed pond improvements is 0.52 ac-ft. The detention volume required for the improvements is 1.76 ac-ft. The overall proposed volume of the pond is 3.20 ac-ft. When subtracting the detention volume, existing buffer WQv and proposed pond WQv from the proposed volume provided, this design provides an excess of 0.91 ac-ft of additional W(Dv. The detention pond is proposed in an area not easily supervised by the high school staff. Because of the inherent flooding dangers associated with detention ponds and the lack of the ability to supervise this area, September 2020 Page 1 4 Atnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX access is not promoted to this detention pond. This is directly comparable to the existing ESA on the site, as no access is being promoted to this potentially dangerous location currently. The AESA approval criteria is specified in Section 2.8.4.D of the DDC. As part of this proposed AESA plan, all criteria were attempted to be satisfied where possible. The AESA expands and provides more than the minimum required services by creating a larger WQv than what is being provided by the existing buffer. The detention pond is part of a proposed drainage easement which will act as a legal mechanism to ensure the long-term conservation of the area. The detention pond is linked to an existing open space resulting in a high-quality development meeting the intent of the standards set forth in the DDC. 4 ANNUAL REPORTING Denton ISD will prepare an annual report for three consecutive years beginning 12 months after the proposed improvements are completed. This annual reporting will describe the work done in this area as well as report on the survivability of the plantings. Each year, these reports will be submitted to the City of Denton for review. Items such as removing invasive species and re-seeding the native grasses mixture shall be included in these reports. If changes need to be made to the plan during this three-year period in order to ensure the sustainability of the plantings, Denton ISD shall notify the city prior to implementation. Once the three-year monitoring period is complete, the city shall inspect the plantings and determine if 90% of the plantings are healthy with a reasonable opportunity to survive to maturity. If this is found to be true, the city shall accept the project. If this is found to be false, the city shall notify Denton ISD to replace any unhealthy or dead plantings. Maintenance of this are beyond the 3-year monitoring period is essential to ensure the functionality of the enhanced features within the detention pond expansion. The following are guidelines provided for maintenance plan: Activ Mow to limit unwanted vegetation F ue Annually after the first frost or before the spring and as necessary to eliminate identified nuisances. Native letation should be mowed at a hejght of 6” or hjgherV s As needed Annually and following significant storm events Remove sediment buildup Repair and revegetate eroded areas e 5 SUMMARY The impacts proposed to the existing riparian buffer result from the improvements to the failed drainage system currently on site. The mitigation of this area includes the following: • Excess water quality volume of 0.91 ac-ft • Plantings of native grasses in the bottom of the detention pond expansion • Slope reduction in the bottom of the pond to increase the infiltration of runoff September 2020 Page 1 5 IIitrIP engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX 6 APPENDIX 6.1 AESA Exhibit O f -;, /M iTfIT-:\-i September 2020 Page 1 6 Atnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX 6.2 Water Quality Volume (WQv) Calculations Equations R, = 0.05 + 0.009(1) R„ = Volumetric runoff coefficient t = percent of impervious cover way =1.5 (R,) a 12 WQ„ = Water quality protection volume (ac-ft) A = Total drainage area (ac) Existing Riparian Buffer 1 = 0% A = 1.195 ac 0.05 + 0.009 (0) = 0.05 1'5 (o-os) 1'195 = 0.01 ac-ft12 Proposed Detention Pond 1 = 37% A = 10.91 ac 05 + 0.009 (36.8) = 0.38 1'5 (o'38) lo'91 = 0.52 ac-ft12 Summary Volume Provided = 3.20 ac-ft Detention Volume Required = 1 .76 ac-ft Water Quality Volume Required = 0.53 ac-ft Excess Water Quality Volume Provided = 0.91 ac-ft September 2020 Page 1 7 £tnp engineers Alternative Environmentally Sensitive Area Report surveyors landscape architects Ryan High School & Denton ISD Main Transportation Center Denton, TX 6.3 Landscape Plan jf Cai ,\ 1 1,q&al ie \ a=t tXtI in . l:_JL•jlC ua 3 ; IJB3aF IId]Of H FlaiR :l3 lootloS q61H ueAU ii;;;Iii!!; suo!+eAOUOU R SUQ!)!PPV bt;i/ \\ n.___r/ H • ( { 4 S\- I -":: ! ! 'i!i i I H•l•ht\ I IIBT l• ii ggI I I 2 Snb Ula< tIaZ 3 ! k \\1 M + / / 1 - 1! I'=T /: :/\ ; j'hi L I \ I i /\/ E I ")(„/ ,'’ ; iii :!!ii g: i i ! /j i ii(Q,fil iLI iLL • a September 2020 Page 1 8 £tnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX 6.4 Riparian Buffer Assessment City of Denton Development Services “OneStop-Shop” the Pba Serving [knton’s Development NeedsDENTON February 18, 2020 Sent via email to: pvarughese@tnpinccom PROJECT: ESA20-0007 Ryan High School Renovations SUBJECT: Results of the Environmentalty Sensitive Areas Field Assessment(s) Mr. Varughese, An ESA Field Assessment has been completed for the Environmentally Sensitive Areas located on the subject property. Assessment form(s) generated during the site visit have been saved to the Approved Folder in ProjectDox. Please review the assessment form for more detailed information and any map revisions. A summary of the assessment conclusions is provided below. CONCLUSIONS: An unnamed tributary of Pecan Creek collects drainage from Ryan High School and traverses the southeastern comer of the propertY. The following conclusions were made after assessing this stream: 1. The western channel and downstream portion of the eastern channel, though previously channelized, have developed a riparian zone along the waterways. Upper banks direct sheet flow runoff toward the buffer zones. The western channel and the eastern channel below the headwall structure meet Riparian Buffer ESA crtteria. 2. The eastern channel upstream of the headwall has concrete block revetment and lacks a functional 3. riparian zone. This area does not meet Riparian Buffer ESA criteria. The downstream area along McKinney Street has a stone overflow structure and armoring and is not Riparian Buffer ESA The upstream end of the west channel has a 50 feet buffer which extends around the headwater of the natural stream riparian area. The actual Riparian Buffer is smaller than map. Streams do not appear to meet WOTUS status as they are not present in historical photographs.5. Cross nmbers Upland HabItat was previously shown to exist on the Official ESA Map on the western edge of the property. The following conclusions were made about the Upland Habitat: 1. The corridor west of the bus yard supports the edge of a Cross Timbers Upland Habitat. 2. An area south of the bus yard, between the bus barn and the earthen berm contains post oaks and blackjack oaks but lacks contiguous canopy and understory thus does not met Cross Timber Upland Habitat ESA criteria. A canopy of trees adjacent to the mapped Cross Timbers Upland Habitat was also assessed. Trees in the area are larger Pecan trees with understory of small scattered blackjack oaks and shrubs and does not meet Cross Timber Upland Habitat or Water Related Habitat ESA criteria, 215 W. Hickory St. Denton, TX 76201 (940)349-8541 https://www.cttyofdenton.com/en-us/ September 2020 Page 1 9 Atnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX City of Denton Development Services “One-Stop-Shop” One Place Serving Dalton’s Development NIbEaTON NEXr STEPS: The site plan and civil engineering plans show encroachment into the western riparian buffer ESA. This is a deviation from Subsection 7.4.7 of the Denton Development Cx>de (DDC) and would require the approval of an Alternative ESA Plan (AESA). The procedure to apply for and seek approval of an AESA is outlined in Subsection 2.8.4 of the DDC. While a Development Project Facilitator has been assigned to you to act as a liaison with the staff Development Assistance Team throughout all projects related to your development, I will continue to serve as the lead for any questions or concerns you may have regardirB the Environmentally Sensitive Areas identified on your site. P tease do not hesitate to call or email me with any questions or concerns. Sincerely, Christi Upton Environmental Compliance Coordinator City of Denton Environmental Services 940-349-7135 christi.upton@cityofdenton.com September 2020 Page 1 10 £tnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX Riparian ESA Assessment Form DENTON Vnsioa 4, J. Daddy, CXXob€ 2012 Owner: DISD Traklt #: ESA20-0CX)7 5101 E McKinney St Stream Name: tributary to Pecan Cr Approximate Width: 2’ Order: 1_ General Land Use (current) [rorw [ Agicultulal (crop , pagure, hnoq [ Rcgkknthl (hw intaLdty, higr tntendty) [ Commercial /rndBUial [ Recreational FF Other: school Purpose of Riparian Buffer (cha all that apply) [ htclvcpt wdimmt F intercept pcstiai ag [ loner natertemperaue [ Improve Hdl hahtat [ a®h,shu [ P,iv&y P intercept nlrrialts/fertBkas 1- hterc€p( other polh£ants [ help gatibZE armmtnnk [ improve wiklife haIMat (species ofintcnst §tream Bank Condition Evicktrce offraFra+ W:ItU level changa (Yes I No) Slope of bank: 2W Soil class: clay I sand /loatn / gnwel / ledge Active erosion: slight / mcxkr8te / severe Existing plant cover: little –rune / moMate / well ve©tzted lk>minaat cover: cement / ban / Bass / shrub ! forest ywng / forest old LarBe Inning kew? No Invasive exotics praent? No Approximate ara of infestation TeD of Bank Existing plant w tv: liltIe none i maIcute / well vegetated IX)mirwtt cover: cernent / bare / gIbbS / shrub / forest young I fiirest old Invasive exotics lx©ent? A{4xoxirrute ara of infestation: S% Floodway lrwart? b) Soil in#: Gb'IiI fine sandy loam. 1-3% sIc>pw ellisbw& finq nrldY IgqIn IOg+ $jqpq+ September 2020 Page 1 11 Atnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX Above the Bank Active aosial: sligtR / mcxlaate i severe Slope: 3% lms the larxl slope toward or away Iron water’? 'l'oward [bes the ]arxl dina runofFtouards lhc bufFer? La EvidetBe afIbed flow or wncerrtratod flow? Few rills md up of tnrk satljrrg ar conmuaw channel Plant cover on existing land: little dune / ax>dene / well vegetated IX>tnirwR oovu: canaR / ban / glass / shrub / forest yang / forest old Invasive exotia pnent? he be Url(aBm Aplroxinute aru of infestation: me Nuisance wildlife pnsmt? Yes / No Species: Water Quality COIIn clear / gjidRly turbid / tutbid ; very turbid Type and Quantity of Potential Pollutants from Drainage Area (check all that apply) [ Lana& laldxnpes, or other areas where fettilizrs or pesticias are und [ Land inldvcty cropped with expowd nils at ocrtah times of thc yar p CIR„,nerc,M fertilzcr tmd P aHnmUCial pe$tici&sued F Gazingmim8ls un the drdnag area [ Cr8Hng nlimajg have accew to the stream P PKki„g lol, ur rod,I, WIld rtarorrinlo thc dream F Snp Hopes drain into the stream F Sndtive ngICrieSprennt [ Plant or mimal q>ecies of u>ncem are prewlt [ Srcam und for mimmingortxlating [ Bream is und as a &inking water SJurec [ A neII is locacd near the dream P Ccxlstrlrtion is prupond in the aainap ate& Gxlgnwtial is P T£n\- impact pot€1tial (lxrrks, Iowangty r&tbntiaI) [ High impact put,vrtiul (urtxrn d:vcloprncnt) Fa, „,11 pl,t [ aream / watershed is in claw proximity (34 miles) to a ck)nngrum nIrfwe water aipply September 2020 Page 1 12 Atnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX Vegetation Brief Survey Bank IXwtlirurd spq•cia sd entiRe nanu$Comrncvr names % cover Indicutor status S3uthern cattail OBL40 10 FACCuIT dodk FACt J Buffer IXxninard specics $cientific llama Common names % cover Indic3t€x status fortisMixed 30 N/A Hydrophytic Vegetation hIdicator Ratio Bark 2 : 0 mlHer 0 : 2 September 2020 Page 1 13 Atnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX Hydrology Indicators (Prin-ry) 17 bIn@ed IF sil bal,a,di, Upper 12 belles F Water mas ET nln linn RF 9x£mcnt tXpogts RF Ed&am ofctniaap pattern (Swotxlary) F Qxidizr3d Rout chdnnrJs in 14)per 12 inches [ Water gained leBYC3 [ ComB S,iI S„„,y [ F,oN„a„I TaI Comments llvdric Soil Indicators F Hjgonl [ Higic Epipexkxl [ hlfid, oh, RF Aljric Mojgurc Regjme F R£dnhg conditions F arycd or LDwChrDma Chlors [ Concretioas F Hid slrfa£e orWic ;aatent [ Upnic grmking h mndy xiils [ Lid.d,„ I,Hal hy,h, al Ii,t F USed on national by&ic nils jjg F Othu (avplain in oonrnents) Comments Required Attachments: RSAT Site map Photographs September 2020 Page 1 14 £tnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX Comments: I Western channel and downstream portion of eastern channel, though previously channelized, have developed a riparian zone along the waterways, Upper banks direct sheet flow runoff toward the buffer zones. Western channel and the eastern channel below the headwall structure meet Riparian Buffer ESA criteria, Eastern channel upstream of the headwall has concrete block revetment and lacks a functional riparian zone. Area does not meet Riparian Buaer ESA criteria Downstream area along McKinney Street has stone overflow structure and armoring and is not Riparian BuRer ESA The upstream end of the west channel has a 50 feet buaer which extends around the headwater of the natural stream riparian area, Actual Riparian Buffer is smaller than map, see map for reduction of ESA area Streams do not appear to meet WOTUS status as they are not present in historical photographs. 2 3 4 5 Conclusions Based wn the gto inqm,tion ty the City ofl>nron, the area in qwgjon is WI en ESt requiring SO or 100 foot tx£Fers and [ therefore is not stijec,ted to the M reqirrmentsout]ined irl the Thntcin lkvek)pmcnt Cod. All other appropriate aspects of the tRIlIIon th:vcioprn6al GM, however, still apply, The otFicial city Eg\ map will b qxhlcd to rcmovc lhc arm horn Based won the ite inspection IF the City of Denton, the area in gestion IS an ESA and is wtject to the ret+irnrent nt F R,rtl, i,-b,tion 17 ,f ih, Ih.t,. lk,'et,pm,.t Co,b (if thi, t„x i ,hHkH! mI ,a Hq,pl,m,ntal RMT f,rm) - SEE MAP, SOME AREAS REMOVED f- Band won the ite ing>wt ion tV the City of lknton, insufficient information is availaUe to cbtermine thc Eg\ statIS 1 of the area in gestion. A more attengve ing)ection is reqired froar either the CIty of Denton or the property owrer The detauiMioa oftlu ESA gaIus is permanerdly valid and may ally tn revisited if8ipi6caat new inforrmtion that necnsitatn a major chango in the dL+nmin8tion becomes available. A request for reconsideration of tIn detamination any be submitted in writing tv tIn dpplicatrl larrdownn, or agent within 30 days of the date tKlow +k## Signature of field investigator: Date:17 Feb 2020 H#z.£ Date: Approval: _18 FQbwarY 2020 September 2020 hge 1 15 jitrIP engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX Supplemental RSAT Form DENTON """“"M'“””"""""“"“'" ' RSAT Evaluation Catl General Rating Catl I Cnd and A&qociatcd Point Ran 2. Channcl Scouring / D 9-11 6-8 3. Phvsiml In-stream Habitat 7-8 7-8 74 67 7.8 4. Water O 5 Habitat Conditions 6. Bio Enter NA for not applicable categories Total Points Verbal Ranking FAIR Total Score 23 or % of total (if NA is entered on any mtegory) 42-50 Excellent 304r G.„I 16.29 Fair < 16 Poor (or 2 &I lnnea of total) (a) S perwnt of total > &t) (32 £FIunt af total >60) (Ias than 32 perunt af total) Table 1. Channel Stability Ca GoodErceUent IndIcatIve of hydrologIcal lkrv regIme alteratIon physical / aquatic habItat :: id=:n . PE,„ iS sloughing or failure 71'80 % of bank netwak stable. Ink=xpraH siPS of txrnk sloughing, dumping or failure. 5(b70 % of bank network stable Some sips of bank slwdrin& Jumping orfailtuc. < 50 % of bank network stable. Rc<nt signs of bank sloughing, slumping Or failuraq are frequently bend areas are 1 SUnm bend aras aN Outer stable. Chan bank height lightly 2.3 ft above stream level. el.BarRovuhang slight to m(xlerate Strwm bend areas are highly untablo. Quin bank height signihmntly above stream C>vntrangs are large and deep. ProvIda knight bto the past, present, md possIble future chan8a III 9tnmr channel Expo„db,, ,o,t, ,Id, I Exp„,,da,, ,o,t, ,Id ,nd large, and woody.large, smaller young roots wane. 2-3 rears largeGeneIIlly (bl reccas large tree taIls / straIn I tree HIs / stream mile mile Yung exposed aec roots are common. 'bS rec€ga large Un falls pn stream mile BkXlom lf3 oftnnk is s'naally highly erosion resistant plant I soil matrix / soil mat;iI or or matcTial &Atom 1/3 of bank is Batom 1.’3 of bank is highly ercxlible matai4L nant / soilgeawrlly highly ercxliblc material.matrix is severely wmpromi sed or noncxidmt.Plant / soil matrix is Ch,ulllcl cross scttion is generally shaped like a wide J (I10 September 2020 Page 1 16 Atnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX Table 2 Channel Scouring and Sediment Deposition Relates to tb level oftncoatroll€d sUm wat© IunotE sodianr# load, and &.lllqxxt and (bgrakrrion olin. sbmm habItat Riflle embedded <Riale embed&d 25 to 23% sand/ siR (<35 % 1 4w6 sand / silt (35 to 39 % for larBn order strnms)for larger order streams Riale etnlndckd 50- 75 % (6Q to 83% elib&d£kd for !arBer Potential for higl mrmbn of deep pools (2 ft. ord,nFer) Rx>I 8ubstr4t£ < 30% 3arxl / silt Potential for mcxlaat p,went sand / silt Poter8hl for low gunba ofcbtp p(xi& Pool suI>HIde b 60 to 80 samI / gjlt StreamtKd streak Streak marks or tnllana marks and for tnw41ra- 1 duped cLIItnsits we shaped 80dimuR Fresh, lars$ smd dwogas hr channel we uncommat Small lomlized ar%s of flesh sand deposits alarg the top of low banks Frul\ large sand ckposisincfnnnel are oonanonl Moderate rarrnbes of loaIti7£d areas of &esh smd depodts almlgttn tIP of low banks Frwh, large und deposits very conunon in ctwrnel. Moderate to be,rw wH tkpasition along major ptxtian oftl= ovnb:ink xm Poinl bars are fav small, 8table, aId are well vegetated and / or covered with little or no Fresh sand on point Point bars are small arxJ Poird bes are mcxierHe to Inge sized and are amounts of fresh Point tun are moduatc to large nized and unstable, with high umounrs of fresh kind lxcscot in most strIam bends September 2020 Page 1 17 £tnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX Table 3. Physical In-stream Habitat me EIre&at I Good Fair Poor R£lates to th ability of the streaIrr to meet twh physical nquhemeat3 nnessary for the wplxn ofa well balanced aquatic comrwnity (i.e+ willa tearpa,xture. wat© velocity, sutntrdte type and 'Wlity, -'.. .) vetted p©inretu )85 percent of bottom channel width during seasons whae water fIon’s (non-stonn water base flows) wetted pedmdu 61 to 85 lnrceat of tx#tom channel wIdth drIllIB susats wIne water flows (aoa. gum nate base flows) wdted peHmeta 40 to 60 puea8 oftDttmr chaanel wIdth during $easars where vale flows (nm.storm water base flows wetted paimeta < 40 paceat of bolton! channel width during 3nsw whae wat© flows (non. storm water base flows) Evidence of rifnn, run and pools is prewrd. Stream will likely have gras of divas,? flow when Gtx>d mix lutwnn tiffIn, iim, and pools. EvIdence of relatively diverse wk)city and ckpth of now when water is lrc&nt. Few pools are pnsatt and riflleg / IUtS predominate. Wh is shallower and more uaifurn IX)minared bv one habitat tylx (usually runs) and one velocity / depth ca\dition. Velocity / depth di bersity is VbVy low. water IS present, RifIles arc canposed of cd>bIc, gBWCL or rubble with little sand / silt (> 50 pwcad in material) Rifnu nlrcscTrl a goal dx ofcdbblc, gravel or nibble(25'+9 Bb InBn mat6riaD oomposition jg predomitwdty small tDbblC with gr&vel and sand(5-24 % oobble: RifTlc substraIR:Rifne composition is predominantly small gravel with a high puwntage of sand (<S puccnt cobble). Ri£ne depths are ? 6 hans deep aIring periods when water flows (non.storm two flows) RUle depths are 4.0 to 5.9 inches deep during pedals what water flows (non- slum bae flows) RiHle depths ne 2.0 to 3.9 inches dew during pedcxls when waIn flow (non-storm tnse flous' Rifne depths me l6s than 2 inches deep during periods when \mta flows (non-stonn base flows) Large pools are generally > 24 inches dc\ TxrBe pcxiIs are genwally 18tl) 24 incha deep. Large pools are generally 12 to 18 inches dCI large pools are geaerally < 12 irwh€s dwp. No clxrnIXl alteration Sligrt anmrat of channel m(xli6catiar Mcxlerate amount of cJraanel mcxlificatioa Extensivo channel modi6catimr Summer afternoon wat€tenrpa,gure in middle ofwalu oolunn < 82 degrees Surnmcr aRanoon \tata tearpnatun in mick;Ile of wWw colunar 82 89 £kgree8 Summer aflcrnoon wnta tmper8fure rn rniddlc ofwat,T column 89 – 94 degrees Summer aftbrnoon WHa temperature a middle of water column > 94 dcjccs 7-8 54 34 b2 PoInts 3 September 2020 Page 1 18 Atnp engIneers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX allTable 4.Water llicablc when the stream is activI flowing)0 a me Good Fair level Substrate folding level Ii&M (11.2D %} ul the undnside of rocks (refers to the pewt£ago ofa oobble dzed storn lying itn in the streambed that is coated with biological gnu+1). Substrate fouling level Substrate fouling level mtxlerHe (21.SO %) on high ( > 50 % ) al the the urBlersid€ of rocks utxlenide ofrwlu (refers (nfa3 to the pucenfage to the peneata8e ofa cobble sized gone lyingof a cobble sized gone free in the strmmlnd thatlying Bec in the is coated with biologi£,astrumtnd that is coated with biologinI go\ah}growth) general level of hItman utivhy. po ha and DOth poM sourw =d=Ii:In:Rt ;::liZLiT:=In: tinres atten the drum is actively TDS 350+399 +Nm9 mb/l War,r has $1igrr organicWaLT has no exjgr odor WaIn hu gtj#I WatcT has mcxlcral£ to In(XicX8ae odorada Table 5.larian Habitat Conditions shedm e=rgetm. temper,rarre regimes, and txlth aquatic and tarrHUial hakim Wide (<2CX> feet)Punta hiRer Fwrnlly Rilwian area iS nutrrre forested tnaer predomirwaly wcxxl,•d,mme than l€X> feet wide along the major pMon ofalong both banks but thue are mdor loahnd SIPS ill am ortx)th tuaks banks Canopy coverage Canopy ooverage Frovicks Carnpy covnage novides : 80 pucerR 65-79 pateta $bac£ng fora 1 po\icks 454+perrzat shading for a #ujuitymajority ofthc stream (45shading for a nnJwity ofth€ stream (= 60 to 59 parcels for large ofthe drum (30-H perl.ent for I.USe puc8n fm largedrums) streams streams BiolTable 6 ical Indicators (only a !icable when the stream is a flowin Considered to be Diverse community of Mayflin and cacklisnin Pollution tolnant wddisnie& midge larvaare Hand. (io(xI overallthe bat overall indication of dominated by mzynics I diversity at aber diptuan3 gtram health and predominant, largeand cacklisflies. Few the level of numtKr of aquaticsnails, lacchc& aquatic Iowawortns lxeseat Modellie to high ofMcxlaae to bidrnunbu Low to m(xlerate ntunb,7 of diIFacnl ofdifFuu£ organisms ntantx:r of individuals September 2020 Page 1 19 Atnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX Site map ESA2&0007 Ryu Hbh School Riparbn Bufhr ESA U aBtltg sa = &Bajl HO n aunt adam = AIESI SO HAIEn aHern = DBaBBle SO Baal nmWea A gaz:lUmeN too = aes8 nqBes WandIn He MU ESSnmwa SIAW9. WFFER HABrrAT 80== Fed September 2020 Page 1 20 Atnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX West branch looking do dominated by cattail and spikerush.East branch IocPHBd SnH In stream habitat with spikerush. Flow is consistent enough to support alga and develop c habitat. RIg b /' J+ + = Lj ;&### September 2020 Page 1 21 !!trIP engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX East branch upstream of headway is channel lined with black nvetment September 2020 Page 1 22 Atnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX 6.5 Cross Timbers Upland Habitat Assessment DENTON Upland Habitat Assessment vaon 3, J. Dailey, (X:t c#= 2012 Owner: DISD Trakit #: ESA20-0007, Address or location: 5101 E McKinney St – north area currently mapped. Old growth canopy tren (b„i.,.t ,p„i„) Scientific IUnes A stellata Comrrx)n names % cover aak oaknd Comments Regrowth canopy trees (domin&nt species) 2 marlonthca 3 Cornmerrt s Small trees/saplings (d,imi,„mi sp'an) September 2020 Page 1 23 Atnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX Cutnmults Understorv - shrub / vine / fort)s / grass (dominMa s?„„,> Commcxrts Dead Timber F Standing F Fallen FI Ihtritus/leaf litter Soil Type F A IFsol orUlisol (lcd sandy-ham\tUI sandstone rocks) [ aber Soil aup unit mInds): guI ant wn'N Iwm, 10% +Ims Birome fine sandy IInnL 1.3% slopes _ AttachmeRts; Site map Photographs Comments: I 2 Corridor west of the bus yard supports the edge of a Cross Timbers Upland Habitat. See map for confirmed Cross Timbers Upland Habitat ESA. Area south of the bus yard, between the bus barn and earthen berm contains post oaks and blackjack oaks, but lacks contiguous canopy and understory thus does not met Cross Timber Upland Habitat ESA criteria September 2020 Page 1 24 Atnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX Conclusions: Bmd Iq>on the dIe inVest ion tv the CIty oflknto& the arm in qngjon is NOT an ESA and thenfon is not st+jwted to the [ ESA rrqtirrments oultnod tn the Eknton Ehvelopmgnt Co k. All other appropriate aslnct3 of the Eknton Ekvelopment Cock:, bOWVCT, gjll apply. The ofllcial city ESA map will k: Lpcbled to remove the arca from ESA staIrs ['- Band won the ite iapnt ion tV the City oflknton, the arm in question IS an ESA and is ulject to the reqtirment et N forth in Section 17 of the Denton Dwelopmalt Cocb f- Band loon thc dIe in 4nt,lion tv thc Cily oflk:nLon, insufficient informalion is wailalle to cLturminu thc Eg\ gulls 1 of the arm in enSjgn. A more extenive in#€ction is IetFtired from either the City of IXnton or the property owrer Tbd dcterrnirutiar ofttu ESA gaIus b permanetRly \did &Id mary nilly be ra'i sited if$igtifiwrt new infmmation that necessitates a major change inthe ddamination tHComa awiIatHe Arequest for nconsickratioa of tIn ddeminatioa may be subnritted in u7tting by tIe appli,nnt, bmk)wner, or agent within 30 da\s of tIe date blow. /in};'l+ Field investigator: Date:14 Feb 2020 Approval : Date .18 February 2020 September 2020 Page 1 25 Atnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX Site map ESA2@0007 Ryan Hbh Schod UplarH Habitat ESA CerBerkte ncds HABITAT = eBBS nnbusupll = UBer MMa SS99ReHwH tSO == Feet Edges of Cross Timber Upland Habitat are present along west property line September 2020 Page 1 26 Atnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX September 2020 Page 1 27 £tnp engineers surveyors landscape architects Alternative Environmentally Sensitive Area Report Ryan High School & Denton ISD Main Transportation Center Denton, TX 6.6 Planting List Drainfield Mix • • Area: 22,397 sf Components: o Big Bluestem o Cereal Rye Grain o Eastern Gamagrass o Green Sprangletop o Prairie Wildrye o Swithgrass o White Tridens o Broomsedge Bluestem o Bushy Bluestem Supplier: Native American Seed Company• September 2020 Page 1 28