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2026-03-19; Update on the City of Encinitas' 101 Leucadia Drainage "Big Water" Project - (District 4); Gomez, Paz
To the members of th~: CITY COUNCIL Date~\,~\ii.cA ✓ cc ✓ cM✓YcM ✓ DCM (3) v March 19, 2026 Council Memorandum To: From: Honorable Mayor Blackburn and Members of the City Council Paz Gomez, Deputy City Manager, Publi~orks Sheila Cobian, Assistant City Manager ~ Via: {city of Carlsbad Memo ID# 2026011 Re: Update on the City of Encinitas' 101 Leucadia Drainage "Big Water" Project - (District 4) This memorandum provides an update to the April 10, 2025, Council Memorandum, provided as Attachment A, on the North Coast Highway 101 Leucadia Drainage "Big Water" Project in the City of Encinitas. Background Encinitas is constructing a drainage improvement project along North Coast Highway 101 in the Leucadia community, generally between La Costa Avenue and Basil Street, immediately south of the boundary with Carlsbad. The project involves constructing a large storm drain to convey runoff northward, ultimately discharging peak flows and stormwater volumes into Carlsbad's existing storm drain infrastructure near the intersection of North Coast Highway 101 and La Costa Avenue. Carlsbad previously granted Encinitas a drainage easement at this location; however, this project would increase drainage beyond the permissible scope of the easement. Despite a review process including meetings and email correspondence to address the proposed increase in volume and intensity of runoff to the City of Carlsbad, Encinitas staff have not provided sufficient technical documentation or justification for Carlsbad staff to fully evaluate the proposed design or assess its potential impacts to Carlsbad drainage infrastructures. Instead, construction on the project is proceeding with an estimated completion later this year. A summary of the key concerns include: • Unauthorized Use of Carlsbad's Infrastructure -The project extends beyond the scope of the existing easement's drainage area and approved infrastructure use, potentially increasing Carlsbad's liability as a result of possible storm drain failure and maintenance responsibilities that could result from increased vegetation growth in the storm drain infrastructure. Public Works Branch Transportation Department 1635 Faraday Avenue I Carlsbad, CA 92008 I 442-339-2980 t Council Memo -Update on Encinitas' 101 Leucadia Drainage "Big Water" Project (District 4) March 19, 2026 Page 2 • Risks to existing infrastructure -It is unclear whether Carlsbad's existing drainage system can accommodate the additional flow from Encinitas without increasing risks of damage to the existing drainage and street infrastructure along Carlsbad Boulevard since the existing infrastructure was not designed to accommodate the increased flows. • Water Quality Impacts -Additional runoff may introduce pollutants into sensitive areas such as the Batiquitos Lagoon, with potential regulatory implications. • Long-Term Impacts -Key assumptions regarding flow capacity, runoff volumes, drainage patterns, future storm drain infrastructure phasing and ongoing maintenance responsibilities remain unclear and unresolved. Discussion The North 101 Leucadia Drainage "Big Water" project directs additional stormwater peak flow and volume north of the Encinitas city limits into Carlsbad, connecting to storm drain infrastructure that was not previously designed to receive this runoff. Carlsbad staff are concerned about the potential impacts of Encinitas' proposed project to Carlsbad's drainage infrastructure. Although coordination between staff members from both cities occurred from 2022 to 2025, Carlsbad has not granted approval to Encinitas for their proposed changes to storm water drainage flows. Encinitas cites a 2004 stormwater easement; however, the proposed project, which is currently under construction with an estimated completion this summer, exceeds the easement's scope. Carlsbad staff have also identified several other issues requiring further review with Encinitas. Recent timeline • March 20, 2025: Carlsbad sent a notice letter to Encinitas, which included a request to meet to discuss the City of Carlsbad's concerns. Encinitas' City Attorney reached out to Carlsbad's City Attorney to schedule a meeting. Carlsbad's City Attorney provided meeting availability dates, but Encinitas' City Attorney did not respond, and the meeting was not scheduled. • June 11, 2025: Encinitas' Director of Engineering/City Engineer responded to Carlsbad's concerns with a letter attempting to address Carlsbad's concerns while also stating they disagree with Carlsbad's interpretation of the existing drainage easement. • August 8, 2025: Carlsbad's Transportation Director/City Engineer requested that Encinitas provide additional project and engineering information. • November 13, 2025: An in-person meeting was held to further discuss the matter. Encinitas' attendees included the Assistant City Manager, Director of Engineering/City Engineer, Principal Engineer, and their engineering consultants. Council Memo -Update on Encinitas' 101 Leucadia Drainage "Big Water" Project (District 4) March 19, 2026 Page 3 Carlsbad's attendees included the Transportation Director/City Engineer and the Senior Engineer for Drainage. • December 19, 2025: Encinitas' Director of Engineering/City Engineer provided an additional response. • March 17, 2026: Carlsbad's Transportation Director/City Engineer responded, provided as Attachment B. In the March 17, 2026, letter, Carlsbad staff reiterated their concerns on the impact to Carlsbad infrastructure by the construction of Encinitas drainage improvements. Staff requested further clarification and technical analysis information to demonstrate that the Encinitas drainage improvements will not adversely impact Carlsbad's drainage system. Recently, Carlsbad's Transportation Director/City Engineer has also reached out to State Parks to make them aware of the possible impact on their property as well. Next Steps Staff will continue to work with Encinitas staff on this issue. Staff have offered to meet with Encinitas staff and State Parks staff when the next rainstorm event occurs so that all parties can visually observe the impact on the drainage system. Staff are also in the process of engaging a consultant to assist in identifying potential alternative solutions to address the drainage issues. Attachments: A. Council Memorandum dated April 10, 2025 B. Carlsbad letter dated March 17, 2026 cc: Geoff Patnoe, City Manager Cindie McMahon, City Attorney Jeff Murphy, Deputy City Manager, Community Services Laura Rocha, Deputy City Manager, Administrative Services Tim Lyons, Assistant City Attorney Amanda Flesse, Utilities Director Tom Frank, Transportation Director/City Engineer Jason Haber, Intergovernmental Affairs Director Kyle Lancaster, Parks & Recreation Director Mike Strong, Community Development Director Amy Ventetuolo, Communication & Engagement Director Mariel Cairns, Acting Engineering Manager David Edwards, Senior Engineer Council Memorandum April 10, 2025 To: Honorable Mayor Blackburn and Members of the City Council From: Paz Gomez, Deputy City Manager, Public Works Via: Sheila Cobian, Assistant City Manager~~ Attachment A {city of Carlsbad Memo ID 2025028 Re: Notice Letter to the City of Encinitas Regarding the 101 Leucadia Drainage "Big Water" Plan Project (District 4) This memorandum provides a summary of the key concerns outlined in a recent letter from Carlsbad to the City of Encinitas dated March 20, 2025 (Exhibit 1} regarding the 101 Leucadia Drainage "Big Water" project. Background Encinitas is proposing to connect a portion of its drainage system to Carlsbad's storm drain infrastructure to address localized flooding in Encinitas. While coordination occurred between staff members from both cities from 2022 to 2025, approval has not been granted by Carlsbad. • Encinitas cites a 2004 stormwater easement (Attachment A to Exhibit 1}; however, the proposed design appears to exceed the easement's scope. Staff have also identified several other issues requiring further review with Encinitas. Discussion The 101 Leucadia Drainage Project and Potential Issues Encinitas is constructing a drainage improvement project along North Coast Highway 101 in the Leucadia community, generally between La Costa Avenue and Basil Street, intended to mitigate localized flooding. The project involves constructing a large storm drain to convey runoff northward, ultimately discharging peak flows and stormwater volumes into Carlsbad's existing storm drain infrastructure near the intersection of North Coast Highway 101 and La Costa Avenue. However, Carlsbad's system was not designed to accommodate these additional flows. Despite a review process including meetings and email correspondence to address the proposed increase in volume and intensity of runoff to the City of Carlsbad, Encinitas staff have not provided sufficient technical documentation or justification for Carlsbad staff to fully evaluate the proposed design or assess its potential impacts to Carlsbad drainage infrastructures. A summary of the key concerns include: Public Works Branch Transportation Department 1635 Faraday Avenue I Carlsbad, CA 92008 I 442-339-2980 t Council Memo -101 Leucadia Drainage "Big Water" Plan Project (District 4) April 10, 2025 Page 2 • Unauthorized Use of Carlsbad's Infrastructure -The project extends beyond the scope of the existing easement's drainage area and approved infrastructure use, potentially increasing Carlsbad1s liability and maintenance responsibilities. • Flooding Risks -It is unclear whether Carlsbad1s existing drainage system can accommodate the additional flow from Encinitas without increasing flood risks. • Water Quality Impacts -Additional runoff may introduce pollutants into sensitive areas, such as the Batiquitos Lagoon, with potential regulatory implications. • Construction Phasing -The project scope lacks clarity on drainage management during construction, raising concerns about potential disruptions. • Long-Term Impacts -Key assumptions regarding flow capacity, run-off volumes, drainage patterns and ongoing maintenance responsibilities remain unclear and unresolved. Next Steps The letter from Carlsbad to Encinitas requested a meeting to discuss these outstanding issues. Encinitas's City Attorney reached out to Carlsbad's City Attorney to schedule the meeting, which is being coordinated for a mutually convenient time and location. Exhibit: 1. Letter to the City of Encinitas dated March 20, 2025 cc: Geoff Patnoe, City Manager Cindie McMahon, City Attorney Gary Barberio, Deputy City Manager, Community Services Laura Rocha, Deputy City Manager, Administrative Services Amanda Flesse, Utilities Director Tom Frank, Transportation Director/City Engineer Jason Haber, Intergovernmental Affairs Director Kyle Lancaster, Parks & Recreation Director Jeff Murphy, Community Development Director Sarah Lemons, Interim Communication & Engagement Director Hossein Ajideh, Engineering Manager David Edwards, Senior Engineer EXHIBIT 1 March 20, 2025 Ms. Jill Bankston, P.E. Director of Engineering/City Engineer City of Encinitas 505 South Vulcan Avenue Encinitas, CA 92024-2056 Dear Ms. Bankston : {c ity of Carlsbad VIA EMAIL This letter is responsive to your email dated January 15, 2025, that provides that after attempting to work with the City of Carlsbad ("Carlsbad") and finding those efforts to be "unfruitful," the City of Encinitas ("Encinitas") unilaterally proceeded with the 101 Leucadia Drainage "Big Water" Plan project, or Project, that, in part, connects to and makes use of Carlsbad drainage infrastructure. Carlsbad strongly disagrees that any passage of time for inter-agency coordination constitutes any sort of waiver of Carlsbad's property rights nor has Carlsbad provided implied consent for Encinitas to proceed. In fact, Carlsbad repeatedly tried to address the impacts and concerns of the Project, which are described in greater detail below. Carlsbad previously objected to the use of Carlsbad's drainage infrastructure by Encinitas related to this Project, and this letter serves as written notice that Encinitas is infringing on Carlsbad's property rights by having proceeded of its own accord without Carlsbad's approval. The unilateral decision by Encinitas to connect to Carlsbad drainage infrastructure was, by your own admission, due to funding constraints and seems to have been a risk calculation made by Encinitas. Carlsbad also strongly disagrees that Encinitas has the authority to use Carlsbad Infrastructure under the existing stormwater easement dated June 4, 2004 ("Existing Easement") in Attachment A. The Project exceeds the terms of the Existing Easement based on both the drainage area that is described and the exhibits depicting the approved use of the infrastructure. Even under the Existing Easement, Carlsbad has the right to require the relocation of Encinitas's infrastructure. This letter serves as notice that Encinitas has exceeded Public Works Branch Transportation Department 1635 Faraday Avenue I Carlsbad, CA 92008 I 442-339-2746 Ms. Jill Bankston, P.E. March 20, 2025 Page 2 the scope of the Existing Easement and must promptly relocate its infrastructure to remove it from Carlsbad's drainage infrastructure. Encinitas connecting Its Project to (and making use of) Carlsbad's drainage infrastructure is problematic because it increases Carlsbad's regulatory risk and actual risk. Specifically, by increasing the watershed area that drains into Carlsbad's municipal separate storm sewer system (MS4), Encinitas has increased pollutant loading during wet weather causing beach and lagoon water quality to degrade. Further, the addition of dry weather flows from illicit discharges and other nuisance flow has the following negative impacts to Carlsbad: (1) triggers the requirements of existing Bacteria Total Maximum Daily Load (TMDL), (2) likely increases the number of beach advisory days, (3) increases vegetation growth in the open channel creating wetland habitat. Further, as Encinitas well knows, the co-mingling of runoff from agencies makes it difficult to assign liability to future regulatory actions and increases the water quality regulatory risk for Carlsbad. Beyond regulatory risk, Carlsbad is concerned with the actual risks created by the Project and the unilateral decision to use Carlsbad's drainage system. If the system is not accurately modeled, which Carlsbad has yet to see sufficient evidence of, then storm events may overwhelm drainage Infrastructure, leading to property damage, road closures and emergency repairs. Further, it is not clear to Carlsbad that the long-term maintenance costs of the Project have been accounted for, nor has Encinitas agreed to assume them. Incorrect assumptions about basin capacity and flow patterns lead to increased maintenance expenses for Carlsbad in perpetuity. To resolve this dispute, Carlsbad requests a meet and confer with Encinitas to discuss these issues as soon as possible. Sincerely, Tom Frank, P.E. Director of Transportation/City Engineer Attachment: A. Letter to City of Encinitas dated June 26, 2002, with Existing Easement cc: Geoff Patnoe, City Manager Cindie McMahon, City Attorney Sheila Cobian, Assistant City Manager Paz Gomez, Deputy City Manager, Public Works RONALD R. BALL CITY ATTORNEY JANE MOBALDI ASSISTANT CITY ATTORNEY CINDIE K. McMAHON DEPUTY CITY ATTORNEY JULIA L. COLEMAN DEPUTY CITY ATTORNEY EXHIBIT 1, ATTACHMENT A CITY OF CARLSBAD 1200 CARLSBAD VILLAGE DRIVE CARLSBAD, CALIFORNIA 92008-1989 (760) 434-2891 FAX: (760) 434-8367 June 26, 2002 Glenn Sabine, City Attorney City of Encinitas 505 S. Vulcan Avenue Encinitas, California 92024-3633 RE: STORM DRAIN EASEMENT Dear Mr. Sabine: RANDEE HARLIB SECRETARY TO CIT',( ATTORNEY ARDIS SEIDEL LEGAL SECRETARY/PARALEGAL Please find enclosed a copy of the City of Carlsbad's agenda bill and resolution regarding the above referenced project, for your files. It was a pleasure assisting the City of Encinitas with this project. afs Enclosure Very truly yours, ·~~ IA COLEMAN D puty City Attorney c: John Maashoff, Associate Engineer 0 w ~ a: a. ~ CITY OF CARLSBAD -AGENDA BILL AS# 16,795 MTG. 6/18/02 TITLE: APPROVAL OF A STORM DRAIN EASEMENT DEPT. HD. TO THE CITY OF ENCINITAS FOR THE BENEFIT OF THE 7-r() CITIES OF ENCINITAS AND CARLSBAD CITY ATTY. -~=--- DEPT, CA CITY MGR. RECOMMENDED.ACTION: Adopt Resolution No. 2002-11a approving a storm drain easement to the City of Encin_itas, which easement will benefit both the Cities of Encinitas and Carlsbad. ITEM EXPLANATION: The City of Encinitas has formally requested a storm drain easement from the City of Carlsbad to accommodate placement of a storm drain system underneath a portion of Carlsbad Boulevard. The storm drain system will benefit both the cities of ·Encinitas and Carlsbad by cottecting runoff along Highway 101 and C~nsbad Boulevard. The City of Encinitas will install, operate and maintain the storm drain system, at its own risk and expense, along, west of, and east of Highway 101, beginning at Athena Street and extending through to La Gosta Avenue. An existing catch basin west of Carlsbad Boulevard, at Carlsbad State Beach, will be connected to this new storm drain. This catch basin collects runoff from Car1sbad Boulevard near Carlsbad's southern City limits. The storm drain system will affect approximately 3423 square feet of Carlsbad Boulevard south of La Costa Avenue. An overflow pipe will be installed at Carlsbad State Beach, which will help prevent flooding on Carlsbad Boulevard due to overflow from the detention • basins at Carlsbad State Beach during larger storm events. Finally, a combination-of oil/water separators, new landscaping at the storm drain outlet, and an outlet structure which wilt trap sedimentation and trash, will help improve water quality at the discharge point at Carlsbad State Beach, and will satisfy NPDES requirements. FISCAL IMPACT: Because the City of Carlsbad owns the parcel of land burdened by the storm drain easement there is no fiscal impact on the City from the recommended action. ENVIRONMENTAL REVIEW: In early 1999, the City of Encinitas prepared an Initial Study, and routed plans through the State Clearinghouse. The review period for State Agencies closed on May 14, 1999 without any comments from the State Agencie~. On June 9, 1999,. the City Council of the City of Encinitas adopted a Negative Declaration for the project. The City of Encinitas has obtained all of the necessary permits for the project. EXHIBITS: ~ 1. Resolution No. 2002-11a ~ 2. Storm Drain Easement ~ ~ u g u ~ ~ ~ w Cl> > -a: 1i: al, _.c3~1 ~ls~ i cr:~s:a: gt;'~~ ~tu~-~ i?~!ic:i go< ~~~ ~ ~ a: -;3 (.) 2 3 4 5 6 7 8 9 10 11 12 .13 14 15 16 17 18· 19 20 21 22 23 24 25 26 27 28 RESOLUTION NO. 2002-178 A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF CARLSBAD, CALIFORNIA APPROVING A STORM DRAIN EASEMENT TO THE CITY OF ENCINITAS AND FOR THE BENEFIT OF THE CITIES OF ENCINITAS AND CARLSBAD WHEREAS, the City of Encinitas has formally req!,Jested that the City of Carlsbad grant the City of Encinitas a Storm Drain easement that would allow the City of Encinitas to install a storm drain system through a parcel of land owned by the City of Carlsbad; and • WHEREAS, the storm • drain system the City of Encinitas is installing, operating and maintaining at its own risk and expense, will benefit both the Cities of Encinitas and Carisbad by collecting runoff along High~ay. 101 and Carlsbad Boulevard, and preventing flooding on Carlsbad Boulevard due to overflow from the detention basins at Carisbad State Beach during larger storm events and; WHEREAS, the C,ity Council of the City of Carlsbad, Califomia has dE:termined it n~cessary and in· the public interest to grant .a Storm Drain easement to the City of Encinitas for installation of storm drain improvements along Carlsbad Boulevard near Carlsbad's southern City boundary. NOW, THEREFORE, BE IT RESOLVED, by the City Council of the City of Carlsbad, California, as follows: 1. That the above recitations are true and correct. 2. That the attached Storm Drain easement is hereby granted to the City of Encinitas for the purpose described therein. 3. That the City Clerk of the City of Carlsbad is authorized to sign the attached Storm Drain easement on behalf of the City Council. 1 1 2 3 4 5 6 7 B 9 10 11 12 iwi .13 cf ~ ~ <08 ::IO w 81 14 ..:~!< CD -a:'~ 5 ~ o O a fl 15 ~6~~ 0 Z a: . 16 a:a:<~ ~ Oa, <Cg~ 17 /:: ~ ~ 0 u 18 19 20 21 22 23 24 25 26 27 28 PASSED, APPROVED .AND ADOPTED at a regular meeting of the Car1sbad City Council held on the ___ 1 __ at=h---day of_.:..· J::..:UN=E __ , 2002 by the following vote, to wit: AYES: Council Members Lewis. Kulchin, Finnila, Nygaard~ Hall NOES: None ABSENT: None > . ; Page 2 of 2 of Resolution No. 2002-178 2 City Clerk 3 .. ◄ RECORDING REQUESTED BY WHEN RECORDED ~AIL TO: City Clerk CITY OF CARLSBAD 1200 Carlsbad VIiiage Drive Carlsbad, CA 92008 THE ORIGitlAL Of THIS OOCUMENT WAS ~'£CORDED 00 JUN 28, 2002 DOCUMENT NUMBER 2002-0550707 GREGORY J. SMITH, COUNTY RECORDER SAN DIEGO COUNTY RECORDER'S OFFICE TIME: 4:21 PM Space Above This Line is for Recorder's Use Assessor's Parcel No: 216-04 STORM DRAIN EASEMENT The City of Carlsbad hereby grants to the City of Encinitas a Storm Drain easement for the purposes stated hereon; over, under, across and upon the real property described in Exhibit "A" for the benefit of the property referred to in Exhibit "C". This easement is granted to the City of Encinitas effective immediately and in perpetuity. The property burdened by the Storm Drain easement is described in Exhibit "A", which includes a plat labeled Exhibit "B", and is attached hereto and incorporated herein by this reference. The property benefited by the Storm Drain easement is described in Exhibit "C", which is attached hereto and incorporated herein by this reference. The Storm Drain easement provides access to the parcel described in Exhibit "A" to the City of Encinitas for installation of a storm drain which will serve the Cities of Carlsbad and Encinitas. The storm drain will run over, under, across and upon the burdened property for the benefit of the property_benefited and any successors in interest to the property benefited by this Storm Drain easement. The storm drain will drain areas west of Highway 101 from Athena Street to Carlsbad State Beach, a North County Transit District right of way in Northern Encinitas, Highway 101/Carlsbad Boulevard from Athena Street to Carlsbad State Beach, Vulcan Avenue from Orpheus Avenue to Basil Street, and areas east of Vulcan Avenue. This Storm Drain easement shall run with the land, and the burdens of the easement shall be binding upon and the benefits of the easement shall inure to the benefit of all successors in interest to the real property. The City of Encinitas shall, at its own risk and expense, install, maintain and, if necessary at any time, upon the request of the City of Carlsbad, relocate the above-described storm drain facilities. The City of Encinitas shall, in addition, 16,795 6/18/02 1/4 indemnify and hold the City of Carlsbad free and harmless from any and all claims, demands, losses, damages, or expenses resulting from the construction, maintenance, use, repair or removal of the storm drain facilities, including any loss, damage, or expense arising out of (1) loss or damages to property and (2) injury to or death of any person. Dated: June 24, 2002 APPROVED AS TO FORM: RONALD R. BALL City 5 T-089 P. 002/006 F-994 EXB:IBI'l' "A" tEGAL DESCRIPTION ASSESSOR'S PARCEL NUMBER: 216-04 VESTING: THE CITY OF CARLSBAD THAT PORTION OF SECTION 33, TOWNSHIP 12 SOUTH, RANGE 4 WEST, SAN BE~INO MERIDIAN, IN THE CITY OF CARLSBAD, COUNTY OF SAN DIEGO, ST~TE OF CALIFORNIA DESCRIBED AS FOLLOWS: SAID PORTION LYING WITHIN THE RIGHT-OF-WAY OF CARLSBAD BOULEVARD (OLD HIGHWAY 101} AS SHOWN ON STATE HIGHWAY PLANS XI-SD-2-B SHEET 8 OF 29 APPROVED DECEMBER 26, 1933, COMMENCING AT A FOINT ON THE CENTER LINE OF COAST HIGHWAY 101, SAID POINT BEING A POINT ON A CURVE OF THE "B" LINE AT ENGINEERING STATlON 132+00 PER SAID STATE HIGHWAY PLANS, FROM SAID FOINT A RADIAL LINE BEARS SOUTH 6'6°09' 39" WEST (SOUTH 65° 29' 47" REC.); THENCE ALONG SAID AA.DIAL LINE 50. 00 FEET TO AN ANGLE POINT ON THE WESTERLY RIGHT-OF-WAY LINE OF COAST HIGHWAY 101 ~ER SAID HIGHWAY PLANS; THENCE ALONG SAID RIGHT-OF-WAY NORTH 34°41 1 56" WEST 679.28 FEET {NORTH 35°21' 48" WEST 679.28 FEET REC.) ; THENCE NORTH 43° 04' 58" WEST 30. 4 7 FEET (NORTH 43°44' SON WEST REC.) SEING THE INTERSECTION OF THE SOUTHERLY CITY LIMITS OF THE CITY OF CARLSBAD AND THE WESTERLY RIGHT-OF-WAY OF CARLSBAD BOULEVARD BEING THE TRUE l?OINT OF BEGm.NmG; THENCE CONTINUING ALONG SAID RIGHT-OF WAY NORTH 43° 04' 58" WEST . (NPRTfI 43° 44' 5-0" WEST REC. ) 64, 30 FEET THENCE LEAVING SAID RIGHT-:OF-WAY NORTH. 42°43'08'' EAST 13.66 FEET; THENCE SOUTH 47°16'52" EAST 66.05 FEET TO A POINT ON THE SOUTHERLY CITY LIMITS OF THE CI'l'Y OF CARLSBAD; THENCE SOUTH 4 8° 41' 5 0" WEST 18 . 4 7 FEET ALONG SAID CITY LIMITS TO A POINT ON SAID WESTEBLY RIGHT-OF-WAY AND THE TRUE POINT OF BEGINNING. AAVING AN AREA OF 1, 045 SQUARE FEET MORE OR LESS. ATTACHE'o HERETO AND MADE A PART OF THIS LEGAL DESCRIPTION IS A PLAT LABELED EXHIBIT "B11 • THIS LEGAL DESCRIPTION AND PLAT WERE E'REPARED BY ME 'OR UNDER MY DIRECTION. /4 BoBol .L.S. 3·997 ~ ·o 0 II • ~ EXHIBIT ___.,.,-.,...-- ------,¢r:JJ <--\ () '\ ,;,•"' / -~,-- / , • ~1 "---{ -----_,---- ·~s" ➔ r < \ // c,0''r n°37->roO _.,,,.--- w _, <( 0 C/l .... --_.,.,,,,,. ,- '\ .., t-...., ' // C. "\ '(\ \ • ,,,,.,_,,,<P -/ \ '\ 0 ' --.J O , 1/ ' , «.}_ o. / co~ ~-:,/S / ~ ~ '"Ji/ ij' ~ ,/ '_,,-~qp \ v,,.. r , / #'~r:,,•· / I , .. "'1 ;'>"<P ,-,,# / S66'09'39"W RAD. so.co· l1 (S65'29'47"W RAD. REC.) , . ' .----0 ,, , ,,.,,•~~ fl' 0 ,/ \ , I <fl ,4' C ,/ I ,, <·y-" f,,, .,,~"'' ' 0 <'-V .. -~ ' , ,,o ,/ JV,:) , .. $!:',#'> \ , '"/ p' -~~# / ,,;" •• ,~ ' , d' / ,,#' ,,,., ;;. -~ 'y' ,4'',/ ¥" ¼,,- - - -./__ / • ,-# ,/'"" -,&7'-------,,#~ /' S) "'"~"' 7 ------- ,,.'?'-7 ,/ C:JV ,,, • / 9:-'-' ,<J>/ _.,,..~----/ c,~ ,~r:;,,..._ ~~ .... , / "-~~ __ :,. ~ / ~'v~ ,i~//'· '>--.!' n..C5 \ -:~:'• '-., V ' / ,,"",.... _,/ /2~ ----........_ \ , ;.4' \ • I '§ ' I ,/4• _SEE SHEET 2 \ DIMENSIONS SHOWN HEREON ARE DERIVED FROM RECORD DATA Right-of-Way Engineering Services, Land Surveying 4167 AVENIDA DE LA PLATA, SUITE 114, OCEANSIDE, CA. 92056 (760) 732-1366 ACAD FNAME: CITY OF ENCIN1TAS EASEMENT PLAT A.P.N.: 216-04 VESTING: CITY OF CARLSBAD Inc. - x' \ \ DRAWN: MJG DATE:6/6/02 SHEET: 1 OF 2 .......:::. (:!)-cARLSBAD BL @:::-tACOSTA AVE @-EL CAMINO REAL ©:::-ARENAL RD. @-ALGA RO. ~BAllOUITOS OR. VICINITY MAP. DIMENSIONS SHOWN HEREON • ARE DERl~D FROM RECORD DATA 4'lf" :.?• j 1T.,?, ~6'6'Pa~ / EXHIBIT ~ C, --· ·--1"=20' "B" !( """1< /2· K ,I , (!,'\'.Cl , 4','J-~ 'fl "k , .... <'i.J'~ :. ~ ... /:,/{,tfi' ~ § /~~ . : . 7.s. ,,_,ro .··· · V.., /4 A - . ~~ , 5\J ~\ . . . ✓-\ .,,. / ~ .,_p· DENOTES EASEMENT AREA TRUE POINT OF BEGINNING Right-of-Way Engineering Services, Inc. Land Surveying 4167 AVENIDA DE LA PLATA, SUITE 114. OCEANSIDE, CA. 92056 (760) 732-1366 ACAD FNAME: CITY OF ENCINITAS EASEMENT PLAT A.P.N.: 216-04 f ::\-::::-\::-\:-::-::\::::-::-:}\:-::-\\:~:\-::-::) VESTING: CITY OF CARLSBAD 1,045 SQUARE FEET DRAWN: MJG DATE: 6/6/02 I SHEET: 2 OF 2 Ma•y-2~·02 , 07 :29am From• EXHIS:I'l' II A" LEGAL DESCRIPTION ASSESSOR'S PARCEL NUMBER: 216-04 VESTING: THE CITY OF CARLSBAD T-089 P. 005/006 F-984 THAT PORTION OF LOT 20, SECTION 33, TOWNSHIP ·12 SOUTH, RANGE 4 WEST, SAN BERNARDINO MERIDIAN, IN THE CITY OF CARLSBAD, COUNTY OF SAN DIEGO, STATE OF CALIFORNIA DESCRIBED AS FOLLOWS: A STRIP OF LAND 20. 00 FEET IN WIDTH LYING WITHIN THE RIGHT-OF-WAY OF CARLSBAD BOULEVARD (OLD HIGHWAY 101} AS SHOWN ON STATE HIGHWAY PLANS FOR XI-SD-2-B SHEET 8 OF 29 APPROVED DECEMBER 26, 1933, COMMENCING AT THE INTERSECTION OF THE CENTERLINE OF SAID 2 0. 00 FOOT STRil? OF LAND AND THE CENTERLINE OF CARLSBAD BOULEVARD PER SAID STATE HIGHWAY PL.AN, SAID POINT OF INTERSECTION BEING A ·POINT ON A CURVE OF SAID CENTERLINE OF CARLSBAD BOULEVARD AT EGINEERING STATION 147+84.39 TO WHICH POINT A AA.DIAL LINE BEARS SOUTH 53°27' 01" WEST (52°47' 09" CALC. REC.]·; THENCE ALONG THE: CENTERLINE OF SAID 20.00 FOOT STRIP OF LAND SOUTfl 35°271 30" WE:ST 60.29 FEET TO THE TRUE POIN'.1' OF BEGINNDlG; THENCE RETRACING ALONG LAST DESCRIBED COURSE NORTH 35°27' 30" EAST 118.88 FEET TO A POIN'!' OF TERMINUS. HAVING .AN AREA OF 2,378 SQUARE FEET MORE OR LESS. ,A.TTACHED HERETO AND MADE A PART OE" THIS LEGAL DESCRIPTION IS A PLAT LABELED EXHIBIT ... B". THIS LEGAL DESCRIPTlON .AND PLAT WERE PREPARED BY ME OR UNDER MY DIRECT!ON. CECILE.RY~L.S. 3997 EXHIBIT ,,8,, SCALE 1"=30' 2,378 SQ. FT. \ \ DIMENSIONS SHOWN HEREON ARE DERIVED FROM RECORD DATA Right-of-Woy Engineering Services, Inc. Loncf Surveying 4167 AVENIDA DE LA PLATA, SUITE 114, OCEANSIDE, CA. 92056 (760) 732-1366 ACAD FNAME: SD_ESMT.DWG A.P.N.: VESTING: (j)---OARLSBAD BL ®=-I.ACOSTA AVE @-EL CAM.IND REAL PROPERTY . LOCATION POINT TERMINUS S53'27'01 "W RAD. POINT OF COMMENCEMENT 147+84.39 CITY OF ENCINITAS EASEMENT PLAT 216-04 CITY OF CARLSBAD DRAWN: MJG DATE: 6/6/02 SHEET: 1 OF 1 EXHIBIT "C" The benefited property for the storm drain project is the City of Encinitas, a municipal corporation, and the City of Carlsbad, a municipal corporation. Docusign Envelope ID: 7D7F2C49-529A-4EA7-B0A9-219BF2EF0601 March 17, 2026 Dan Nutter, P.E. Director of Engineering/City Engineer City of Encinitas 505 South Vulcan Avenue Encinitas, CA 92024-2056 RE: 101 Leucadia Drainage Project Dear Mr. Nutter: Attachment B {c ity of Carlsbad VIA EMAIL This letter responds to your letter dated December 19, 2025, regarding the North Coast Highway 101 Leucadia Drainage "Big Water" Project ("Project"), Response to Carlsbad's Letter dated August 8, 2025 (Attachment A). The City of Carlsbad ("Carlsbad") appreciates the opportunity to continue coordination with the City of Encinitas ("Encinitas") on this matter. Carlsbad is concerned about the changes to historic drainage conditions resulting from Encinitas' North Coast Highway 101 storm drain improvements. Specifically, that the proposed Project unlawfully exceeds the scope of the storm drain easement Carlsbad granted to Encinitas in 2002, risks damaging Carlsbad's existing infrastructure along Carlsbad Boulevard, potentially introduces pollutants into environmentally sensitive areas, and presents other unknown and potentially detrimental long-term impacts. The proposed Project will also likely increase Carlsbad's ongoing maintenance responsibilities. CARLSBAD'S CONCERNS WITH THE PROPOSED PROJECT The existing watershed conditions in the Leucadia area currently retain and pond stormwater during rain events as shown in the picture below. Public Works Branch Transportation Department 1635 Faraday Avenue r Carlsbad, CA 92008 ·1442-339-2746 Docusign Envelope ID: 7D7F2C49-529A-4EA7-B0A9-219BF2EF0601 Mr. Dan Nutter, P.E. March 17, 2026 Page 2 The proposed Project's drainage improvements seek to reduce this retention by collecting this retained runoff and conveying it downstream to Carlsbad's storm drain system. This change would result in a greater volume and more frequent runoff entering the Carlsbad system, which is not acceptable without proper analysis, authorization and mitigation. After reviewing the materials provided by Encinitas, Carlsbad continues to have significant unresolved technical concerns regarding the design, analysis and downstream implications of the Project's proposed improvements. These concerns relate directly to the safe operation, capacity and regulatory compliance of Carlsbad's storm drain infrastructure. Specifically, we offer the following comments: 1. Point of Comparison for Hydraulic Impacts The analysis provided in the June 11, 2025, Technical Memorandum and restated in the December letter uses the outfall location to the Pacific Ocean ("Element 8"} as the point of comparison for pre-versus post-development discharge. The comparison should instead include the vegetated channel that conveys flows to this outfall since it is considered part of Carlsbad's storm drain conveyance system infrastructure. The Docusign Envelope ID: 7D7F2C49-529A-4EA 7-B0A9-219BF2EF0601 Mr. Dan Nutter, P.E. March 17, 2026 Page 3 increased runoff volume and regularity from Encinitas will particularly impact this vegetated channel given the growth associated with the projected increased urban runoff. 2. Capacity and Condition Issues of the Existing 24-lnch Connection While we appreciate that the maintenance of the 24-inch storm drain is the responsibility of Encinitas and an assessment of the pipe shows that it is constructed of materials capable of withstanding pressurized flow, the issue remains that the storm drain joints and structure connections were not designed for pressurized flow and the increased velocities which need to be addressed as well as its condition. The whole system needs to be able to withstand pressurized flow, not just a component of it. Please provide the hydraulic calculations completed for the analysis of the 24-inch storm drain system, including flow rates and velocities at structures (pre-and post- development Project), profiles, and hydraulic grade lines. 3. Routing Model for Ponto Basin Detention System We also appreciate that a dynamic wave routing analysis was performed for the Ponto detention system. This routing methodology allows for variable tailwater conditions, which is appropriate for interconnected detention systems in which downstream ponding controls upstream basin performance. This represents an improvement over the prior modeling approach. Please provide the results and assumptions of the model, including peak inflows, peak outflows, stage-storage relationships, outlet rating curves, or time series results. 4. Increased Volume and Frequency of Pollutant-Laden Runoff Given that the Project proposes to improve drainage by alleviating ponding in Leucadia, we do not agree with your conclusion that the runoff volume experienced by Carlsbad will be "highly negligible" as stated in your December response letter. With the significant localized ponding areas that capture runoff from rainfall events in Leucadia, the pollutant-laden runoff would be regularly conveyed to the Carlsbad system per your proposed improvements, which concerns Carlsbad. The analysis of the changes in runoff volume and frequency does not appear to be adequate. The single-event storm analysis using the 100-year flood footprint from the 2004 Rick Engineering study and the footprint from the 2021 Q3 study and estimating the ponded volume difference to determine the increase in runoff is insufficient. Instead, we recommend the use of continuous simulation methods for the localized and recurring ponding observed in the area. Continuous modeling would allow for proper accounting of exfiltration and evapotranspiration processes that significantly influence Docusign Envelope ID: 7D7F2C49-529A-4EA7-B0A9-219BF2EF0601 Mr. Dan Nutter, P.E. March 17, 2026 Page4 runoff behavior in these conditions. The results of this model would also be based on a numerical model rather than a visual estimate. 5. Impacts on Vegetation and Maintenance Burden on the Carlsbad System The anticipated increase and regularity of storm water runoff volume will significantly contribute to an increase in vegetation growth in the Carlsbad drainage conveyance systems which in turn places an increased maintenance burden on Carlsbad. 6. Use of Water Quality Treatment Best Management Practices (BMPs) We appreciate your use of the U.S. Environmental Protection Agency (EPA) Green Street design BMPs within your proposed road improvement Project; however, given the lack of numerical sizing criteria for Green Street BMPs (in many cases there are none), please provide the types, locations, and volume retention abilities of the BMPs proposed to ensure storm water quality (and volume) requirements satisfy the San Diego Regional Water Quality Control Board (RWQCB) standards required. We respectfully request a revised Technical Memorandum that includes updated modeling to address the points above. Until this occurs, Carlsbad maintains that the current design will place an undue burden and risk on Carlsbad's storm drain infrastructure. To address Carlsbad's concerns with the projected increased drainage from the Project, Carlsbad is engaging a consultant to study options that would address the impacts of the increased drainage flow from Encinitas. THE STORM DRAIN EASEMENT Carlsbad granted a storm drain easement to Encinitas in 2002. The storm drain easement allowed Encinitas to install, access, and maintain the storm drain Encinitas seeks to expand as part of the Project. As we have included in prior correspondence, the proposed increased drainage from Encinitas exceeds the scope of the easement granted by Carlsbad by increasing the drainage area beyond the permissible scope of this easement, and the proposed discharge is not authorized by the Carlsbad City Council. Additionally, the storm drain easement requires Encinitas to "indemnify and hold [Carlsbad] free and harmless from any and all claims, demands, losses, damages, or expenses resulting from [Encinitas'] construction, maintenance, use, repair or removal of the storm drain facilities[.)" Correspondingly, if Encinitas proceeds with the Project, Carlsbad will seek compensation from Encinitas for all expenses Carlsbad incurs resulting from Encinitas' expanded storm drain infrastructure. These expenses potentially include, without limitation, those relating to damage to Carlsbad road and storm drain infrastructure, increased maintenance obligations, increased vegetation management, and any regulatory or statutory fines, assessments, or penalties. Docusign Envelope ID: 7O7F2C49-529A-4EA7-B0A9-219BF2EF0601 Mr. Dan Nutter, P.E. March 17, 2026 Page 5 We look forward to discussing options for alleviating the increased drainage to Carlsbad's storm drain system downstream of the Project. We continue to value our working relationship with Encinitas and remain committed to collaborating on a resolution that supports the goals of both jurisdictions while protecting infrastructure and public safety. If you have any questions, please contact me at 442-339-2766 or tom.frank@carlsbadca.gov. Sincerely, Tom Frank, P.E. Transportation Director/City Engineer Attachment: A. Letter from the City of Encinitas dated December 19, 2025 cc: Geoff Patnoe, City Manager Cindie McMahon, City Attorney Sheila Cobian, Assistant City Manager Paz Gomez, Deputy City Manager, Public Works Tim Lyons, Assistant City Attorney Jennifer Campbell, City of Encinitas City Manager Jace Schwarm, City of Encinitas Assistant City Manager Ajit Th ind, City of Encinitas City Attorney, Colantuono, Highsmith & Whatley, PC December 19, 2025 Tom Frank City of Carlsbad Engineering Department 505 S. Vulcan Ave, Encinitas, CA 92024 760-633-2770 engineering@encinitasca.gov www.encinitasca.gov Public Works Branch, Transportation Department 1635 Faraday Avenue Carlsbad, CA 92008 Attachment A Subject: North Highway 101 Leucadia Drainage Project, Response to Carlsbad's Letter Dated August 8, 2025 The City of Encinitas has received and reviewed your letter dated August 8, 2025, regarding the North Highway 101 Drainage Improvements project (Project). We appreciate your input and the continued communication as we collaboratively move our extremely important capital project forward. To aid in the discussion on our scheduled November 13, 2025, meeting, we are providing responses to the comments provided in your August 8, 2025 letter. The City of Encinitas has acted and continues to act within its rights and responsibilities regarding this Project. Accordingly, and for the reasons discussed below, the City of Encinitas believes that there are no significant or unresolved technical concerns regarding the design, analysis, and downstream implications of the proposed improvements. The responses below are numerically consistent with Carlsbad's comments in your August 8, 2025, letter: 1. Point of Analysis for Hydraulic Impacts Table 1 of the Technical Memorandum provided to Ca rlsbad by Encinitas on June 13, 2025 provides a series of hydraulic analysis points, including the Ponto Basin and the discharge to the Pacific Ocean. The 18" CMP (Element 5) is an Encinitas facility that lies within an easement granted to Encinitas. This pipe is not included in Carlsbad's MS4 per your annual report to the Regional Board, only Element 8 is included as an asset in Carlsbad's MS4. See Attachment 1 for referenced maps from the June 13, 2025 Technical Memo. 2. Unaddressed Capacity and Condition Issues of the Existing 24-lnch Connection The existing pipe is steel encased, and has been confirmed via visual assessment. It's understood the pipe is steel encased due to the pipe being installed via trenchless technology. Regardless, the presence of a steel encasement provides a high level of protection, including against damage from existing or increased pressure flow conditions. Encinitas has CCTV'd the 24" Storm Drain Line running to Ponto Beach and the line is in satisfactory condition. The current alignment under construction is reflected in Construction Change 4. After the diversion structure at Station 138+71, the existing 24" pipe has a total maximum pressure of 5.4 psi as determined through analysis of the HGL, peak flow, and pipe physical characteristics. This resulting pressure is well below the typically specified joint failure limits referenced in ASTM standards for reinforced concrete pipe. 3. Lack of Routing Model for Ponto Basin Detention System Dynamic wave routing calculations for the basin as all other modeling elements were performed using PC SWMM based upon storage topography for the basin, as built information regarding inflow and outflow pipes, structures, etc. The hydrologic information used at the inflow boundary condition was taken from the design level study prepared in conjunction with the final project improvement plans. The "design level study" incorporates the hydrologic results of coupled 1D-2D modeling developed by Q3 consulting done as part of the master plan for North Leucadia. This analysis was performed in good faith, using best professional judgement as a courtesy to respond to Carlsbad's comment letter dated March 25, 2025, and is not intended to initiate a formal submittal or plan check review process with City of Carlsbad staff. These calculations were performed by professional engineers with over 30 years of storm water expertise. Encinitas and the Engineer of Record for the project stand behind these calculations. 4. Increased Volume and Frequency of Pollutant-Laden Runoff As previously stated in the memo from the City of Encinitas on June 13, 2025, " .... the watershed area has not increased nor been altered from the existing City of ENCINITAS Page 2 of 4 condition. Additionally, factors such as land use, municipal operations, and other variables commonly understood to influence runoff volume, pollutant constituent, and concentration will all remain unchanged with a slight decrease in impervious area from existing conditions following Project completion. These findings are documented in the Project hydrology study previously forwarded to the City of Carlsbad Since runoff volume and pollutant concentration will not be impacted, total maximum daily pollutant load, by extension, will remain unimpacted for all constituents ..... " Since our last meeting, Encinitas has undertaken additional steps to respond to Carlsbad's concerns regarding hydrologic connection of flood volume observed at street level in Highway 101 with the Ponto Basin resulting from new and properly sized drainage inlets and pipes necessary to meet the City's roadway drainage design standards, as well as the fundamental objectives of the project. Attachment 2 graphically superimposes maximum 100-year surface flooding near the project limits against the overall watershed boundary to the Ponto Basin. Maximum surface flooding limits and depth are taken from the Q3 report for the master plan dated November 2021. The watershed boundary limits are taken from a Rick Engineering study of the project area June 14, 2004. The exhibit shows that the volume of flooding in, or within proximity to the project, is roughly 15% of the overall runoff volume to Ponto Basin. A similar analysis was performed for the 10-year event. This analysis demonstrates a proportional drop down to 10% (i.e. surface flooding volume relative to runoff volume to the Ponto Basin). During a smaller or water quality event (i.e. the 85th percentile storm), we would intuitively expect the proportional change in volume to be highly negligible (i.e. less than 5%). The specific percentage has not been calculated; however, the existing condition surface flooding during a water quality event is expected to be minimal or non-existent. Conclusions relative to the proportional change in water volume can also apply to potential changes in pollutant load at the receiving water level. However, the project is not without water quality mitigation measures. The project includes stormwater BMPs that meet or exceed the standards set forth by Encinitas and the County of San Diego for projects characterized as a "Green Street." 5. Impacts on Vegetation and Maintenance Burden in Carlsbad System The area surrounding the flow exiting the headwall at Ponto Beach is owned and maintained by California State Parks, not the City of Carlsbad. The City of Encinitas City of ENCINITAS Page 3 of 4 has leg rights vested through a drainage and maintenance easement over the areas where the runoff flows from the headwall to the culvert underneath the parking lot roadway. The City of Encinitas is responsible for maintaining this vegetation in compliance with State Environmental Regulations (See Sheet 22 of Dl-013 and Carlsbad DWG 395-8A). As stated in #4, since the volume of water is negligible, the resultant nutrients are negligible as well. 6. Use of Inadequate Water Quality Treatment Best Managem ent Practices o r BM P's The project design team prepared a Green Street SWQMP for the entire project which adhers to the City of Encinitas BMP Design Manual and the US EPA Green Street Guidance. All calculations in the report verify that the BM P's proposed for the entire corridor (ultimate condition) are adequate to meet regional and state stormwater requirements. 7. Lack of Hydromodification Management Plan (H MP) Analysis This project utilized a Green Street Exemption based upon the US EPA Green Street Guidance from 2008. Because of this, the project is exempt from Hydro modification Management per the City of Encinitas BMP Design Manual and San Diego Regional Water Quality Control Board directives. We appreciate the ongoing collaboration and dialogue with the City of Carlsbad, a valued neighbor to the City of Encinitas. We are committed to the success of the Project and believe this clarifies our responsible actions and considerations. Sincerely, Dan Nutter Director of Engineering/ City Engineer 760-633-2839 dnutter@encinitasca.gov Attachments: l. Description of Encinitas Modeling Elements and Carlsbad MS4 Map 2. Hydrologic Exhibits City of ENCINITAS Page 4 of 4 ATTACHMENT 1 Reference Maps from June 13, 2025 Technical Memo 3. Description of Modeling Elements 1. Ponto Basin -Begin Analysis. Existing sand bottom detention basin. Heavily vegetated with high permeability within surface and side areas. Receives flow from City of Encinitas Project plus overland flow from Areas l.a and 1.b. Outlets to 36" RCP Basin Connection Pipe. Flow from the City of Encinitas Project is Described within the H&H Study for the Construction of North Coast Highway 101 Leucadia Drainage and the Addendum 2 -Drainage Study for the Proposed Storm Drain Revisions Downstream of the junction Structure to the Outfall at Ponto as a result of Construction Change 4. 2. 36" RCP Basin Connection Pipe -outlets to Beach Basin 3. Beach Basin -Existing sand bottom detention basin. Heavily vegetated with high permeability within surface and side areas. Receives drainage from 36" RCP Basin Connection Pipe and overland flow from Area 3.a. Outlets to Beach Basin CMP Riser Structure with Circular Orifice 4. Beach Basin CMP Riser Structure with Circular Orifice -Receives Flow from Beach Basin. Outlets to 18" RCP Basin Outlet Pipe 5. 18" RCP Basin Outlet Pipe -Receives flow from Beach Basin CMP Riser with Circular Orifice. Outlets to vegetated swale within Highway 101 median 6. Daylight Location of 18" RCP within Highway 101 Median 7. Vegetated Swale Highway 101 Median -Receives flow from 18" RCP Basin Outlet Pipe plus overland drainage from Area 6.a. Outlets to Box Culvert Entrance at Batiquitos Lagoon Jetty. 8. Box Culvert Entrance at Batiquitos Lagoon Jetty. End Analysis. Figure 1: Model Element Locations 3. Results & Conclusion Below are summaries of outputs from the PCSWMM model of each Modeling Element comparing peak flows for basin performance outlet structure performance, conduit performance, and swale performance for the existing and proposed conditions due to the Project. As noted, the point of interest is Element 8, which is where the City of Carlsbad's MS4 system begins. Table 2 shows that Element 8 sees an increase of 1.29 cfs. However, based on the vegetated swale's depth and capacity, it only sees an increase of two hundredths of a foot for the water surface elevation. Therefore, there are no adverse impacts to the City of Carlsbad's facility on Element 8. MS4 Outfall Discharge Monitoring Station Inventory: • Highest Priority Non-storm Water Persistent Flow with Unit ID • Persistent Flow • Not Persistent Flow Other Outfalls: • Carlsbad MS4 Outfall • other MS4 or Private Outfall Inlet lo MS4 ~ MS4 Pipe Owned/Maintained by the City of Carlsbad F"-....,.-MS◄ Channel Owned/Maintained by the City of Carlsbad ~ MS4 Pipe NOT Owned/Maintained by the City of Carlsbad ',./ MS4 Channel NOT Owned/Maintained by the City of Carlsbad .. Non-impaired Receiving Waters .. Impaired Receiving Waters Hydrologic Sub-areas: 904.21 904.31 904.4 904.51 -904.61 I I C cityof Carlsbad MS4 Map and Corresponding Drainage Areas E.2.b.(1) I' =•-- 100 Year, 24 Hour Existing Conditions NO SCALE PREPARED BY GIS SERVICES DIVISION Exhibit 2: EXISTING lOO·VEAR WATERSHED MAP FOR LEUCADIA THIS PROJECT LOCATED WITHIN THE CllY OF ENCINITAS ~ RICK ~:r_:i,N,l•:l,IUNl; CbMPANY ~-' .. , :I -,:-.1•-.• ,_~J~, ~ NO SCALE PREPARED BY GIS SERVICES DIVISION Exhibit 2: EXImNG lOO~YEAR WATERSHED MAP FOR LEUCADIA THIS PROJECT LOCATED WITHIN THE CITY OF ENONITAS