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Home My WebLink About8.2 Kinder-Morgan Energy Pipelline Leak CITY CLERK File # D[]DD-DD AGENDA STATEMENT CITY COUNCIL MEETING DATE: August 15, 2006 SUBJECT: Status Report Regarding Kinder-Morgan Energy Partners (KMEP) Petroleum Products Pipeline Leak Report Prepared by: Mark Lander. City Engineer ATTACHMENTS: 1) 2) Letter dated August 10, 2006, from KMEP Information Bulletin dated June 23, 2006, Distributed to Area Residents by the City RECOMMENDATION: Receive the report. FINANCIAL STATEMENT: There is no financial impact to the City. KMEP determined that the leak was the firm's responsibility and directed that all billings for the incident be directed to and paid by KMEP. DESCRIPTION: KMEP owns and operates a petroleum products pipeline in a portion of the former Southern Pacific Railroad right-of-way which traverses Dublin trom nOlih to south. This line conveys gasoline, aviation fuel, and diesel fuel from Concord to San Jose. In June 2006, detection of a gasoline odor in the storm drain system for the Amador Lakes Apartments on Stagecoach Road led to the discovery of a leak in the pipeline. The leak has since been repaired by KMEP. The following report is presented as a synopsis of the incident, a summary of the current status of the site cleanup, a brief discussion of the ongoing procedures used by KMEP in order to prevent and detect leaks in their pipeline system, and a summary of further action needed. Incident Summary Throughout the entire incident, the Dublin Public Works Department and Alameda County Fire District Staffhave worked together to assess the problem, remove the source of the contamination, and work with COpy TO: Ron McClain, Kinder-Morgan - Page 1 of3 ITEM NO. G:':Kinder-l'-'forgan k,)zergy Partners Pipe/inelagst Staff Report v3 to CC, 8-/5-06.doc KMEP on clean up. Over a period of several days, the gasoline odor that had been emitting from the storm drain in the Amador Lakes Apartments area was traced through the storm drain system to the outfall of the pipe. Necessary environmental measures to protect the water quality were taken and were in place at all times during the incident. In addition, the City and East Bay Regional Park District closed the Iron Horse Trail between Amador Valley Boulevard and the Contra Costa County Line on Tuesday, June 20, 2006, and it was reopened on July 14, 2006. The public was notified of the temporary closing of the trail through po stings on the trail and on the City of Dublin website. The City took additional measures during and after this incident in the form of communication with the residents and the completion of an after-action analysis. The City developed an information bulletin for the residents on both sides of the pipeline (Attachment 2) that was hand delivered by City Staff on Friday, June 23, 2006. There was an after-action analysis of the incident completed by the City of Dublin Public Works Department and Alameda County Fire Department, and it was determined that the incident warranted a continued presence in the field by both Departments in order to balance both the technical and life-safety demands of responding to an incident of this nature. Through investigation and cooperation with Zone 7, Dublin San Ramon Services District (DSRSD), the Regional Water Quality Control Board, Fish and Game, and KMEP, the leak in the fuel pipeline was found and repaired. The storm drain and water lines affected have been lined and replaced respectively. Remediation of the contaminated soil will occur as part of the clean up. Current Status of Site Cleanup KMEP is completing the draft remediation plan, and anticipates submitting a draft copy to the City of Dublin for review prior to submittal of the plan to the San Francisco Bay Regional Water Quality Control Board. Public Works intends to retain an environmental consultant to assist in review of the plan, and will request that KMEP modify the plan if necessary to address any comments by the City and the consultant. The City will also coordinate its review of the plan with the Regional Board, as well as Zone 7 and DSRSD. KMEP has agreed to reimburse the City for costs to date associated with the leak, and the City will request that KMEP also pay for the cost of the consultant. At this time, locating the source of the intrusion is not necessary as the storm drain lining will prevent further intrusion, and the remediation work will remove remaining gasoline in the soil. The remediation work will likely extend over a number of months and could include the removal of contaminated soil, aeration of the contaminated soil, or vacuuming the gasoline out of the soil. Public Works will continue to work with KMEP during the remediation to ensure that construction issues, such as dust control, noise, traffic control, trail access and erosion control, are adequately addressed. Pipeline Leak Prevention and Detection Measures KMEP has provided a letter (Attachment 1) outlining the company's standard ongoing operating practices to prevent and detect leaks within its pipeline system. Further Action Staff will continue coordination with KMEP. Efforts will include reviewing and commenting on the remediation plan, and coordination with other agencies such as Zone 7, DSRSD and the Regional Board. Upon approval of the remediation plan by the Regional Board, Staff will monitor KMEP's remediation Page 2 of3 activities through a sitework/grading pennit issued by the City. Upon completion of the remediation work, Staff will work with the Regional Board to confinn that the scope of work outlined in the remediation plan has been successfully completed. Recommendation Staff recommends that the City Council receive the report. Page 3 of3 I KINDERi&MORGAN /;~r ,f ENERGY Pj\RTNERS, L.P. August 10. 2006 Mr. Mark Lander City Engineer City of Dublin 100 Civic Plaza Dublin, CA 94568 Dear Mark: Thanks for your inquiry about Kinder Morgan's efforts related to the release from our 10-inch pipeline in the City of Dublin. Let me assure you that Kinder Morgan takes pipeline safety very seriously. From our perspective, pipeline safety includes safety for the public living along our rigl1ts-of~way (ROW), contractors, our own employees and for the environment. First, a status update on the affected area. · Replacement of the Dublin San Ramon Services District (DSRSD) water rine segment is in progress and expected to be completed and in service by August 18. · Installation of a fiberglass liner in the east-west segment of the City of Dublin's storm drain was completed in mid-July, · Installation of a fiberglass liner in the north-south segment of the City of Dublin's storm drain is in progress and expected to be completed by August 14 . · All soil bins and temporary tanks were removed from the site in mid-July. · While the cause of the release is still under investigation, Exponent Failure Analysis, Inc. metallurgical labs has advised KM that the release was the result of metal fatigue resulting from external damage - a draft report from Exponent is expected late next week. o Estimated release volume is approximately 650 gallons. · Approximately 80 gallons were recovered during initial remediation and more during soil remediation. · Site investigation report for submittal to the Regional Water Quality Control Board and to the City of Dublin is being prepared and expected to be finallzed by August 18. This report will Contain recommendations regarding what further investigative or remedial actions may be warranted. I hope this summary demonstrates Kinder Morgan's effort and desire to address all issues related to any release from our pipeline systems. Recent letters to the Contra Costa Times have greatly mischaracterized this recent event While we do not generally respond to letters to editors, we appreciate this opportunity to communicate the facts to the City of Dublin. First, we responded to an odor report. Upon our arrival, there was no evidence of an active leak and indeed there was no odor. After numerous efforts working closely with the city and other responders, no release could be identified. Subsequent to that, an odor returned and some product was noted exiting the storm drain. immediately, Kinder Morgan responded again. This t1me, we excavated approximately 300 feet of our line and found nothing but dry soil along the line. In the further interest of safety, we took an extra step of evacuating the product from the 500 Dallas Suite 1000 Houston, TX 77002 713-369-9000 7 ATTACBHENT I. Mark Lander August 10. 2006 Page Two Hne and refining it with nitrogen. We introduced a tracer gas of helium into the pipeline so we could use extremely sensitive sniffing equipment to search for helium above ground. This yielded a detection of helium about 30 feet beyond where we had excavated previously. Subsequent excavations discovered a very small dent with what appears to be crack and a small leak. This seclion was immediately cut out and sent to a lab for third party evaluation. California Fish and Game and the California State Fire Marshall supported this decision and will receive copies of the final reports from the metallurgical lab. The normal process for the third party metallurgical analysis is to apply pressure to the cut-out pipe to establish a leak rate prior to destructive testing and failure cause analysis. In this case, preliminary indications are the defect was so small that a factor for leakage could not be determined. Again, this is in stark contrast with one letter that states the local water way is befouled and hundreds of lives endangered. In fact, the leak was extremely small and Kinder Morgan's response was very aggressive. Let me outline some steps that Kinder Morgan takes that are preventative and in line with defending our rights-of-way. · We have markers showing the line locations with 800 numbers for anyone to report actiVity or concerns, such as the odor that was reported in this case. · We monitor our ROWs with full time qualified line riders. Often, they monitor the lines weekly. In addition to routine monitoring, we use computerized one call notification distribution systems to line riders. . We perform aerial line patrols. These patrols are scheduled weekly even though the law requires bi-weekly. Pilots watch for unreported construction activities and encroachments or signs of distressed or dying vegetation. Each item is fully investigated by ground crews. . We participate In public awareness programs. Brochures outlining the locations of our pipelines are mailed to residents within 1/8 mile of either side of our pipelines. (A copy of the brochure is attached for your reference.) Additionally, we meet with local fire departments and first responders. We comply with API's Recommended Practice RP- 1162 on public awareness programs. . We require that qualified personnel be present anytime excavation is performed within 10 feet of our pipeline. . We participate with Cal OSHA to strengthen one call laws, especially for those who fail to file one calls and for those who strike a line and subsequently do not report it We are members in the Common Ground Alliance, an industry organization seeking to improve and set standards for one call systems. FinaHy. the Pipeline Safety Act of 2002 included provisions that require companies to perform specific integrity-related activities on all pipeline segments. The Integrity Management Rules arB very comprehensive and may be found in CFR Title 49 S 195.452 - Pipeline integrity management in high consequence areas. These rules are available at http://ecfr.opoaccess.Gov!. The Association of Oil Pipelines and Kinder Morgan's experiences demonstrate a steady decline in incident rates subsequent to these measures within an industry that is already very safe. Constant attention to the requirements of this rule is necessary to assure compliance that all threats are mitigated and preventive measures are initiated. Kinder Morgan is in compliance with this comprehensive law. Mark Lander August '10, 2006 Page Three To conclude, Kinder Morgan apologizes for inconveniences caused the city and residents near iron Horse Trall. As we receive a final report on the causation and potential third party damage, Kinder Morgan wil! take additional steps to identify who may have caused this damage and what remedies we should seek. Thanks for the opportunity to respond to the city and if you have further questions, do not hesitate to contact meat 713-369-9152. Sincerely, ~~j~~.t.L~~ Ron McClain Vice President of Engineering and Operations Kinder Morgan Product Pipelines As one of the thousands of people who live near pipelines, you can help keep it safe and reliable. This brochure will help you: identify our pipelines recognize a leak . take appropriate steps if you notice a leak immediately report a leak know how to notify us with your intention to dig Kinder Morgan cares about your safety. We design, install, test, operate, and maintain our pipelines to meet or exceed regulatory standards. Our employees are thoroughly trained to operate and maintain the system safely. We want you to be aware of our pipeline. We ask for your help in preventirig accidental damage to it. We need your help in preventing pipeline emergencies. The number one cause of pipeline leaks is damage from earth-moving and construction equipment and tools owned by parties other than the pipeline company. If you plan to dig or do any type of excavation or construction work, call your state underground utilities locating service or "One Call Center" (listed in this brochure). A Kinder Morgan representative will locate and mark the underground lines at no cost to you. Call at least 48 hours (excluding weekends and holidays) before you: Excavate Grade . Auger Bore . Tunnel Dredge Install water lines, sewer lines, septic systems, or drains Install telephone, TV or power cable Install drain tile Cut or deepen ditches Blast for clearing Dig postholes Repair or rebuild roads or driveways Plant trees or shrubs Build homes or additions Install swimming pools Even if you haven't provided advanced notification, please contact us immediately if you dig and hit or touch a pipeline - even if you should cause what seems to be only minor damage to the pipeline - contact us immediately. A gouge, dent, crease, or scrape may cause a future safety problem. wpp AEI RTP N R E I 0 l N II G EN U E M Since pipelines are buried underground, line markers are used to indicate the approximate - not exact - location of the pipeline. Line markers can be found where the pipeline intersects a street, highway, or railroad. However, they cannot be relied upon to indicate the exact position of the pipeline. The pipeline may not follow a straight course between markers, which provide no information on the depth or number of pipelines in the vicinity. Don't try to guess the pipeline's location or route by the marker's placement. Call your state "One Call Center" listed on the front of this brochure. KINDERI;MO.R.g.~.~ I I HOUSTON, TEXAS I fOR INfOR'IATION'CAlL TOll fREE I 1~8B8-844~5658 I KINDER*MORGAN PIPELINE 732.541.5161 BEFORE OIGGING . A weakened or damaged pipeline Fire or explosion near or directly involving a pipeline or pipeline facility . A natural disaster affecting the pipeline, such as an earthquake, flood or soil erosion . A leaking pipeline A J\ Hissing or roaring sound Fire or explosion near pipeline A white cloud, fog, or ice Dying plants amid healthy ones Unusual blowing of dirt or dust Persistent bubbles in water Pool of liquids, possibly bubbling An unusual, petroleum-like odor LISTEN FOR: LOOK FOR: SMELL FOR: A Immediately leave the area - on foot - in an upwind direction . Avoid making contact with escaping liquids or vapors . Avoid potential ignition sources Abandon all equipment being used in the area DO NOT drive into an area in which you encounter a leak or vapor cloud DO NOT light a match, start an engine or automobile, use a telephone, or switch on/off an electric light or appliance . Warn others to stay away from the area DO NOT try to operate any pipeline valves yourself DO NOT use a cell phone while near the suspected emergency area From a distant phone, call Kinder Morgan's Emergency number given on the back of this brochure and call 911 or your local fire, police, or sheriff's office If you are a public safety official, use all applicable training you have received in taking the steps necessary to safeguard the public in the event of a pipeline emergency. The following are some guidelines to keep in mind: Secure the area around the leak to a safe distance. This could include evacuation of people from homes, businesses, schools and other locations, the erecting of barricades, controlling access to the emergency site, and similar precautions. If the pipeline leak is not burning, take steps to prevent ignition. This could include prohibiting smoking, rerouting traffic, and shutting off the electricity and residential gas supply. Ifthe pipeline leak is burning, take steps to prevent secondary fires, but DO NOT attempt to extinguish a pipeline fire unless asked to do so by pipeline company personnel. Contact the pipeline company as quickly as possible. Pipeline marker signs show the pipeline company's name and emergency telephone number. Como una de las miles de personas que vive cerca de las tuberfas, usted puede ayudar a conservarlas seguras y confiables. Este folleto Ie ayudara a: identificar nuestras tuberfas reconocerunafuga adoptar los pasos apropiados si usted se da cuenta de una fuga reportar inmediatamente una fuga saber como nollficarnos su intencion de excavar Kinder Morgan se preocupa par su seguridad. Nosotros disenamos, instalamos, probamos, operamos y mantenemos nuestras tuberias para cumplir 0 exceder las normas reguladoras. Nuestros empleados esl<in fatal mente capacitados para operar y mantener el sistema en forma segura. Deseamos que este usted consciente de nuestra tube ria. Le solicitamos su ayuda para prevenir un danG accidental. AlREDEDOR NUESTRA TUBERIA Necesitamos de su ayuda para evitar emergencias en las tuberias. La causa numero uno de las fugas en las tuberias es el danG provoeado por el movimiento de la tierra y el equipo y herramientas de construccion propiedad de otras partes diferentes a la compania de la tuberia. Si usted tiene planes para eavar 0 hacer cualquier tipo de excavacion 0 trabajo de construceion, lIame al servicio de localizacion de los servicios publieos subterraneos de su estado 0 al "One Call Center" [Centro de una sola lIamada] (enlistados en esle folleto). Un represenlante de Kinder Morgan loealizara y marcara las lineas subterraneas sin costa para usted. L1ame por 10 menos 48 horas (excluir los fines de semana y los dfas de descanso) antes de: Excavar Nivelar Barrenar Perforar Haeer un tunel Dragar Instalar Iineas de agua, Iineas de alcantarilla'do, sistemas septicos 0 drenajes Instalar cables de tel8l0no, TV 0 energia electric a Instalar baldosas para el drenaje Excavar 0 profundizar zanjas Dinamitar para despejar Exeavar para eoloear postes Reparar 0 reeonstruir carre teras o caminos de acceso Plantar arboles 0 arbustos Construir casas 0 ampliaeiones Instalar piscinas Aunque no haya enviado una notificacion por adelantado, por favor comuniquese con nosotros inmediatamente si exeava y golpea 0 toea una tuberia - aunque cause 10 que parezca un dano menor a la tuberia - comuniquese con nosotros inmediatamente. Una abolladura, pliegue 0 rayadura puede causar un futuro problema de seguridad. lH.INDE lii~EA TIJBERIA Ya que las Iineas de tuberia se eneuentran bajo tierra, se usan Illareas para indiear de manera aproximada -no exaeta- la loealizacion de la linea. Los mareadores de las Iineas pueden ser encantrados en donde la linea de la tube ria intersecta a una calle, earretera 0 via del ferroearril. Sin embargo, no son eonfiables para indiear la posicion exaeta de la linea de la tuberia. La tuberia puede no seguir un curso dereeho entre dos mareas, 10 eual no proporciona informacion de la profundidad 0 el numero de Iineas en la vecindad. No trate de adivinar la localizacion de la linea 0 ruta por la ubicacion del mal eador de las Iineas de la tube ria L1ame a su One Call Cen- ter [Centro de una lIamada] que esta enlistado en este folleto. wp P A E I RTP NRE I 0 L N L I G EN U E M KINDERfMQ'lg~.~ HOUSTON, TEXAS FOR INFORMATION.cm lOll FREE 1-888-844-5658 KINDERfMORGAN PIPElINE 732-541-5161 BEFORE DIGGING icuAt ES UtdA EMERGENCIA LA LINEl\ TUBERiA1 Una linea de tuberia debilitada 0 danada Incendio 0 explosion cerca 0 que directamente involucre a una linea de tuberia 0 alas instalaciones de la linea Un desastre natural que afecte a la linea de tuberia, tal como un terremoto 0 la erosion del suelo Una tuberfa con una fuga COMO RECONOCER UNA fUGA Er~ UNA liNEA DE TUBERIA CUANDO EsrA CERCA DEREcno ViA LA rUBtRiA ., , TRATE DE ESCUCHAR: BUSQUE: TRATE DE OLER: Un sonido sibilante 0 estruendoso Incendio 0 explosion cerca de la linea de la tuberia Una nube blanca, niebla 0 hielo Plantas muertas en medio de atras sanas Es poco usual vcr tierra 0 polvo soplado par la fuga Burbujas en agua persistentes en el agua Charca de Iiquidos, con posible burbujeo Un olor poco usual, parecido al petroleo QUE HACER DURAtUE UNA EMERGENCIA DE UNA lir~EA DE TUBERIA . Abandonar inmediatamente el area - a pie - en direccion contra el viento Evitar hacer contacto con los Iiquidos 0 vapores que se escapan Evitar potenciales fuentes de ignicion . Abandonar todos los equipos que estan siendo usados en el area No conducir dentro del area en la cual se encuentra una fuga 0 una nube de vapor No encender un cerillo, no arrancar un motor 0 automovil, no usar el telefono 0 prender 0 apagar una luz 0 aparato electrico . Advertir a los otros que permanezcan fuera del area No tratar de operar alguna valvula No usar un telefono celular fT)ientras este cerca de un area que se sospecha es de emergencia Oesde un telMono distante, lIamar al numero de emergencia de Kinder Morgan que se encuentra al revesa de esle folleto y lIame al 911 0 a los bomberos, polida u oficina del alguacH local PROCEDlMIENTOS DE ACCUJN EMERGEt4CIA PARA LOS OFICIAtES DE SEGUlUDAD PUBLICA Si usted es un oficial de seguridad publica, use la capacitaci6n aplicable que ha recibido para tomar 105 pasos necesarios para salvaguardar al publico en el caso de una emergeneia en la linea de la tuberia. Las siguientes son algunas pautas que hay que conservar en mente: Asegurar el area alreqedor de la fuga a una distancia segura. Esto pod ria incluir la evacuacion de la gente de sus casas, negocios, escuelas y otras localidades, la ereccion de barricadas, el control del acceso al sitio de la ernergencia y precauciones similares. Si la linea de tuberia que tiene la fuga no esta ardiendo, tener cuidado de evitar la ignieion. Esto podria incluir la prohibicion de fumar, desviar el trafieo y cortar el suministro la electricidad y gas residenciales Si la linea de tuberia esta ardiendo, tomar las medidas necesarias para evitar los incendios secundarios, pero no intente extinguir el incendio de una linea de luberia a menos que asi Ie sea solicitado por el personal de la compania de la linea de tuberia. Ponerse en contacto con la compania de la linea de la tuberia tan pronto como sea posible. Los senalamientos de la linea de la tuberia muestran el nombre de la compaflia y el telefono de emergencia. NUMERO DE EMERCENGlA KINDER MORGAi~: 'lEA El REVERSO DE ESTE fOllETO Portlan i I ! I i I I I ~- - ,-.J ----- - ----- I I -- -_.1 / I --T---- I /- - ! --r___ I / --r------------L-c / / I I 1---- -- I i I ~------------- J I"'~ I-~-~ l I ; I I I L" I I 'eipdSO----J '. 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L ' >'L___" / I IL~-~1. ~--~-\- ----Z, ~'" "(>--/ '-'-'-~!""""1JA....-........,-~. J' \ '-', I! "'-, / -~_m~_~ I \. \'L/'" I > . ) ( \ / \ _~__\ .c-\ ~ J Lake L_'-l jJ\ \v'-" -\_~'-'-~\.J \ Houston ......-'..-t. Ch. odes (~:;'-"'-- . ....:u"'<." \ ,!;:,YFRESS:"-,.. -,( ,,/ . "/ ''-_'~\~; ,.(, , ---'\ \ , I '''-\./'-, t ,) Wichita I -- l -----" I \ i ATLANTIC ~/ J~') "') ) GULF OF MEXICO 50U Dallos Street, SHite 1000 . HOl/stOIl, Texas 77002 ;";~ ;':J'<~~~ ,,>~j;:);~ PRSRT STD U,s. Postage PAID PERMIT NO. 4885 HOUSTON, TEXAS ~~ra garn2r:tas .:.n State AZ CA(N) CAtS) FL IA IL IN KS LA MO NE NJ NV NM OR TX TX TX WA v 9"1(8 ~;dic:t,"r informacicr http://productspipelinesafety.kindermorgan .com f;<'~i~~;'" Af~tt~ tie C;:l,.t'i?J er 3U eSt~;~fi en Cl.mtactrr '1[ ";;;:mtrn de "l.hl... l..;nffiCiI!<;" co!'! lies [jj~s tk:: ~mth:ipac!6!l), Phone # Name of One Call Arizona Blue Stake System, Inc. Underground Service Alert of Northern CA Underground Service Alert of Southern CA Sunshine State One Call of Florida, Inc. Underground Plant Location Service, Inc. JULIE, Inc, Indiana Underground Plant Protection Service Kansas One Call System, Inc. Louisiana One Call System, Inc. Missouri One Call System, Inc. Diggers Hot-Line of Nebraska New Jersey One Call Underground Service Alert New Mexico One Call System, Inc. Oregon Utility Notification Center Lone Star Notification Center Texas One Call System Dig TESS. Texas Excavation Safety System, Inc. Northwest Utilities Notification Center 800-782-5348 800-642-2444 800-422-4133 800-432-4770 800-292-8989 800-892-0123 800-382-5544 800-344-7233 800-272-3020 800-344-7483 800-331-5666 800-272-1000 800-227 -2600 800-321-2537 800-332-2344 800-669-8344 800-245-4545 800-344-8377 800-553-4344 CITY OF DUBLIN 100 Civic Plaza, Dublin, California 94568 Website: www.ci.dublin.ca.us INFORMATION BULLETIN Area Resident: The purpose of this information bulletin is to provide you with information regarding the construction activity that has been occurring over the past week on the Iron Horse Trail Corridor behind your home. · Last week, the City received a call from a resident in the Amador Lakes Apartments indicating there was a smell of gas present in the complex. · Since that date, the City of Dublin and its representatives have been working with Kinder Morgan, the owner of a petroleum products pipeline that runs through the corridor to find the source of the smell. · During the past week, evidence of a gasoline discharge was found in the City's storm drain which drains into the South San Ramon Creek. · The City has been working with an enviroillnenta1 cleanup company to clean the City's storm drain and prevent any further discharge into the creek. · Kinder Morgan has now found the source and repaired the pipeline. They will also be testing the soil in the corridor to determine the amount of soil remediation that will be required. · During this process, the Fire Department and its Hazardous Materials Team has monitored the activity in the corridor and have assured me that this leak did not present a fire hazard to adjacent residents. · We have requested East Bay Regional Park District to close access to the Iron Horse Trail between Amador Valley Boulevard and the north City Limit line to avoid conflicts between trail users and the construction equipment. · Once the remediation work has been completed, the trail will be reopened. rfyou have any questions, you may contact the City of Dublin Public Works Department at (925) 833-6630. ~~~ l:bchard Ambrose -":ity Manager ATTAUIDIENT k