Document R20jMaBxEk9J68D5ZxDB3J4yV

Nogales SSO and Pretreatment Priority Matrix Distinct Problem S a n ita ry S e w e r O v e rflo w s (S S O s): Sanitary sewer overflows (SSOs) occur frequently in Ambos Nogales, primarily due to severe flooding during the summer monsoons. In addition to microbial contamination, SSOs sometimes contain pollutants from poorly treated industrial discharges. R o u g h e s t im a t e o f A riz o n a c u r r e n t c o s ts : $109,170 in FY2018. Root Cause Numerous factors, including insufficient number, operation and maintenance of flood control structures in Nogales, Sonora; Mexico's practice of using the IOI to mitigate flood events, and unplanned development in the floodplain in Nogales, Sonora. The result is releases of untreated sewage into residential and business neighborhoods in the City of Nogales and the Santa Cruz River watershed. Ranked Recom m endations 1. B u ild s t o r m w a t e r s t r u c t u r e s in N o g a le s , S o n o r a . Recommendations are outlined studies commissioned by the International Boundary and Water Commission 1,2 which focus on the construction of tributary detention basins for flood damage reduction in Nogales, Sonora. The city already has 11 detention basins; limited maintenance is provided. The Nogales, Sonora Institute for Municipal Planning and Research (IMIP) has proposed building an additional 9 basins at specific sites to assist with flood mitigation3. Site selection is based on new studies commissioned by the city given development at basin sites recommended in 20054. 2. M a in ta in e x istin g (an d n e w ) sto rm w a te r stru c tu re s in S o n o ra. The USGS2study highlights the need for continuous maintenance to ensure basins can operate at full capacity over time. R e co m m e n d a tio n Rough Cost Estim a te 5 $2,400,000 (Includes SOW + Construction) (MXN original estimates converted to US Dollars, 19 pesos to the dollar exchange rate) +50% = $ 3 ,6 0 0 ,0 0 0 Annual: $128,000 (MXN original estimates converted to US Dollars, 19 pesos to the dollar exchange rate) Relationship to MOU / ASESP Arizona/Sonora Environmental Strategic Plan (ASESP). Priority W ater Projects Pages 7, 9, 21, 22: This project aims to support maintenance of existing gabions and promote new stormwater gabions as appropriate, and evaluate other formal flood-control alternatives. The goal is to protect the residents of Ambos Nogales and secure its municipal assets by strengthening the region's stormwater management infrastructure while reducing the risk of stormwater-induced sanitary sewer overflows (SSOs). In d u s tria l C o n t a m in a n t s in t h e S a n t a C ru z R iv e r : On average, 200 lbs. of metal (nickel) are discharged to the Santa Cruz River each month. The Nogales, Sonora Municipal Pretreatment Program regulates the quality of wastewater discharged by maquiladoras. These discharges are treated in Arizona. Sonoran oversight of industrial discharges meets Mexico's minimum federal requirements (NOM-002), but is insufficient to detect and respond to dumps of industrial contaminants when they occur. These impact U.S. infrastructure and the operation of the Nogales International W astewater Treatment Plant, threaten Arizona's groundwater resources, and impair the Santa Cruz River. R o u g h e s t im a t e o f A riz o n a c u r r e n t costs: legal case to address this issue is $1,166,923 (to date). N o g ales W a sh B an k Ero sio n Lead in g to IOI and M a n h o le D a m a g e : Because reaches of the IOI are aligned in the open channel of Nogales Wash, the sewer pipe and manholes are subject to damage and rupture due to bank erosion. R o u g h e s t im a t e o f A riz o n a c o s ts : included in SSO estimate for ADEQ. Other State agencies have costs associated with this problem. Additional resources are required for Nogales, Sonora to provide the necessary oversight to meet U.S. standards for environmental protection in Arizona. Solicitations to both Mexico's Federal Department of Water Resources (CONAGUA) and the International Boundary and Water Commission (IBWC) by both ADEQ and Nogales, Sonora have been inconsequential. Minor support has been facilitated through the EPA Border 2020 program, but is far short of what is needed for sustainability. Poorly selected IOI alignment and lack of bank stabilization and stormwater detention along the Nogales Wash. 3. S ta n d - u p t h e N o g a le s , S o n o r a P r e t r e a t m e n t P r o g r a m in m a t t e r s t h a t go a b o v e a n d b e y o n d M e x ic o 's N O M -0 0 2 re q u ire m e n ts , (i.e. collection-system source characterization via monitoring, followed by specific outfall monitoring). Current monitoring is on a one-time annual basis. Additional monitoring is needed to ensure compliance on a continuous basis. Increased monitoring requires additional funding for equipment, personnel, and sample analyses in Mexican-certified labs to ensure there is continuous detection and regulatory response to dumping. Updates summarizing respective activities and results will be shared at quarterly Binational Technical Committee meetings already hosted by IBWC. O n g o in g S u p p o rt. Sustainability will require ongoing support of equipment, staff, and water quality analyses to support activities not required under NOM002 4. B a n k P ro te c tio n an d W a s h C ro ssin g R e in fo rc e m e n t. Protect current alignment by reinforcing Nogales Wash Banks and IOI crossings. 5. Im p le m e n t t h e S a n ta C ru z C o u n ty M a s t e r P la n . The Ephraim, Mariposa, Portrero Creek detention basins will assist with bank protection for the alignment of the IOI in the Nogales Wash, but onlv for storms that fall on the west side of the watershed. The Baffert detention basin will assist with bank protection for storms that fall in the urban area of Ambos Nogales, and may also provide the added benefit of trapping solid waste. These projects will do verv little to address existing SSO and Industrial contaminants in the Santa Cruz originating from Sonora, but mav help prevent a future failure of the IOI in Arizona. + 50% = $ 1 9 2 ,0 0 0 One time: $269,000 +50% = $403,500 Annual: $241,000 +50% = $361,500 One time: $1 7M -$3 2M +50% = $26M - $ 4 8 M Provided by others Priority W ater Projects - Pages 7, 9, 21, 25: This project aims to leverage federal resources to strengthen institutional pretreatment processes in Nogales, Sonora so that contaminant loadings can be mitigated at their source. Respective processes include wastewater monitoring in the binational conveyance for source characterization, information exchange with the regulated community, and support of Mexico's Industrial Wastewater Discharge Limits (NOM-002) where needed. Notin ASESP Sierra Club v. EPA 18cv3472 NDCA Tier 1/Tier 2 ED 002061 00174302-00001 Nogales SSO and Pretreatment Priority Matrix NOTES 1U.S. Army Corps of Engineers, Los Angeles District. Ambos Nogales Special Flood Damage Reduction Study Nogales, Sonora, Mexico Prepared for the International Boundary and Water Commission. Revised September 2005. 2U.S. Geological Survey Open-File Report 2010-1262, 112 p. Nogales flood detention study: http://pubs.usgs.gov/of/2010/1262/ 3 Prevencin y Control de inundaciones en Nogales, Sonora - Resumen Tcnico (July 12, 2016) te le p h o n e and email communication with IMIP (November 17, 2017) 5 Rough cost estimates were developed using available information over a short period of time. A 50% contingency was added consistent with the Association for the Advancement of Cost Engineering (AACE) guidelines for rough order of magnitude (ROM) cost estimates. FIGURES Figure 1: Recommendations for placement of Stormwater Detention Features (ACE/IBWC Study, 2005) (Area in purple polygon, Figure 4) D l s o f e tetm s r t t d & j WiBfefcMtfatorsned : ...t ..... /;-.... ..immfm Sin medidas 350,000 m2 539 estruct. *: tr4qi.6 viWWX * d Aw ? j>r Z& m Csrfcxt. vastto&sSwisttwkt <*** g ><>***-M m m ? 5 4 $ e *5$Sw 5 10 tCeafitWeaS&Ji^t3ftCet5e4sfc. 1:1 1IS3 iS NCkXKq-X VjtWe--ti&SSftiijSQt&ii i W* tttte te4 ftc? C& iSS i? &. ^- UNtefSr4a$1*S!^:P:S^iSSS^SSMf^: ^C^fepi;:i*Mwy{t^iS-:-txeifolieoMwstfetiof4j$wte-wy 18 atente# tej*sy tmift ' ^rtwirs( ^ : 4W> (Ciumepnaccatso de de RMeetednidciasn) 308,800 m2 A 41,200 m2 llWilllliiilliWllli l i l i 82 % 307,700 m2 sV i 1\0 T, 43 /:s sirue l : 20 4 ' I qKboW .. ..A... ..900 m- 435 estruct. A 2 5. 306,800 m- A 435 estruct 0 m: 0 * f$ ff! C - V tt,fc - - W J ^ K'S.V.Ti.v.Pr'^ J Figure 2: Existing Stormwater Detention Features in Nogales, Sonora (Area in purple polygon, Figure 4) 0 . INVERSIONES EN EMBALSES DE RETENCIN O DETENCIN EN EL PERODO 2008-2015 REPRESOS EXISTENTES Ubicacin de las obras autorizadas por FON DEN 2014 en el sector Hidrico CONCEPTO/ Reparacin de Represo. Chi rieness Reparacin de Acceso 3 Represe: 44s Sonora Reparacin de Represo UNISON Reparacin da Repres fvtaci iadors Regulacin: Sistema Pueblitos (Caada dei Muerto? Reparacin Arroyo ANO 2008 2011 2012 ir&c u s q s j CON:AGUA 1 S CONAGUA con recursos FONDEN 20S $ CONAGUA con recursos FNDEN 2008 10129 jfds Muniepees ICOS \ \$ 2014 FNDEN 2014 \S 2014 m pm z l `S.77.065.00 -8.400.00 l-SS-S,20.2 .4 tt6 ,29236 Regulacr Arroyo Regulacin Arroyo Centauro(Monumentos de Psedrajj Reparacin de: Represo 5 de 2014 j FCNDEN 2014 2014 U 1 449 254 22 Capiines 200.3 Cuesta Si:anca 20S TO TA L CO-CEr Programa Frontera 2012 CQCEF Programa Frontera 2Q12 (G 2?`749,584.78 REPRESOS MEJORADOS Y CONSTRUIDOS CON RECURSOS FONDEM 2:014 REPRESOS CONSTRUIDOS PREVIOS A 2.014 GO BERNO MUNI G PAL 2.015-2018 WQCAllZ Sierra Club v. EPA 18cv3472 NDCA Tier 1/Tier 2 ED 002061 00174302-00002 Nogales SSO and Pretreatment Priority Matrix Figure 3: City of Nogales, Sonora Recommendations for Placement of New Stormwater Detention Features (2016) (Area in purple polygon, Figure 4) 1 . FICHA TCNICA PROPUESTA 9 REPRESOS PARA NOGALES PROPUESTAS DE REPRESOS CO N CEPTO TOTAL j | osi.:rstra d e Represa d Retendi y ! ji so H ro l d etao B d a d d ae s "Sdarpasas" \$ I !j inc l u yerG o n stru etl n d e e stru ct ura de | jj em b alse y vertedor c a n gavin: I ,, j: S iste m a i e S e t e o d o Pfavia iP s e b lf o s $ | * jj C o n stru c c i rid e Laguna B y Vertedor 1,2 46 ,17 5.7 6 1,513,254.610 | !i S iste m a d e S e t e n a s rta a ia i iFaefeites,$ | ;J: | C o n stru c c i n d e Laguna C v e r t e d o r . 1,95-2,,356:7:0 | |i :P rof t o e j e c u i i p a w Sfefem d e I } S e te a a n FiLwal "t a M a r a lia '' i b jy e : i .i i; . $ | jj S isedo -d e A d ap taci n de Laguna, V erted or | |i v Estudios N ecesarias. I |: P ro y e c te e je c u tiv a p ara S s i e a i a d e | jj R eteitein P iuvia " Los n g eles" inclu ye: $ | !i P tse o d e Laguna., V erted or y Es-udijos 1 |: N ecesarios. i i: P ro y e c te e je c iitw e jpsra SegBfadjn:. d e 1 & jj A s ra y o Sdidarisdad: 21 nc i uye D ise o de \$ f jj Laguna, V erted or y B ic u sa irtl rjD | Proyecto ejecutivo p srs Sistem a de 1 _ pKe e M d a PluvM "Lsk fflad te" Incluye: $ 1 * jj O s e o d e Estru ctu ra d e Em b alse, V erted or ii ca n G a v i n y Estu d io s N ecesario s. 1 jj P ro y e c ta e je t a t s w d e Siste m a d e IS g j R e t e a Fludial "S a C a ria s" Ineluv'e:. 9 1 ' jjBIsefio de Estru ctura d e Em b alse y Vertedor | l con Gavin. P ro y ecto Ejecu tivo de agrw P resa e n 1 ^A rro y o C it r a e s e s s Inci u^e: d is e o y te d a s $ i " f ios Estudios Necesarios, in clu yeselo | Proyectci 1 ,9 9 1 ,4 0 3 .6 3 2 ,0 3 1 ,2 3 1 .9 ! 2 ,0 7 1 ,8 5 6 .5 5 2>113,29S.SS 2 ,1 5 5 ,5 5 9 .5 5 8 ,0 0 0 ,0 0 0 .0 0 GOBIERNO MNIClPAL 2015-2013 Figure 4: Santa Cruz County Master Plan Detention Features (green triangles) Sierra Club v. EPA 18cv3472 NDCA Tier 1/Tier 2 ED 002061 00174302-00003 Nogales SSO and Pretreatment Priority Matrix Figure 5 - Conceptual Bank and Crossing Protection Sierra Club v. EPA 18cv3472 NDCA Tier 1/Tier 2 ED 002061 00174302-00004