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HomeMy WebLinkAboutItem 4.06 Citywide Storm Repair G~~~ O~ O~~y 19 ~'~`8Z'` STAFF REPORT CITY C L E R K ~ ~ DUBLIN CITY COUNCIL File # ?®©®-©?o ~'~L/FOR~11' DATE: May 17, 2011 TO: Honorable Mayor and City Councilmembers FROM: Joni Pattillo, City Manager SUBJEC Appropriation of Funds Required For Citywide Storm Repair Prepared By: Mark Lander, City Engineer EXECUTIVE SUMMARY: The City of Dublin, as well as much of Northern California, experienced extremely heavy rainfall on March 24t" and 25t" of this year. The storm required response by Public Works Staff and MCE at a number of locations throughout the City. Observation at several of these locations showed the need for corrective work to repair damage due to the storm, .or to correct pre- existing conditions that resulted in problems during the storm. FINANCIAL IMPACT: Cost of repair work is estimated to be approximately $200,000. At this time appropriations are recommended of $155,000 and the remaining $45,000 will be incorporated into the proposed Fiscal Year 2011-2012 Budget. The funds are not currently budgeted and will be allocated from reserves as described in the report. RECOMMENDATION: Staff recommends that the City Council: 1) Adopt the Resolution Approving the Allocation of Funding for Citywide Storm Repairs and 2) Approve a Budget Change. Submitted By Reviewed By Revie y Public Works Director Administrative Services Director Assistant City Manager Page 1 of 5 ITEM NO. ~ ~ DESCRIPTION: . The City of Dublin, as well as much of Northern California, experienced extremely heavy rainfall on March 24th and 25th of this year. The duration and intensity of the storm resulted in flooding and other storm related issues at a number of locations throughout the City., requiring response by Public Works Staff and MCE Observation at several of these locations showed the need for corrective work to repair damage due to the storm, or to correct pre-existing conditions that resulted in problems during the .storm. In order to begin working on corrective improvements additional appropriations are required. The nature of the Projects to be undertaken fall into the following three categories of repairs: 1) Open Space Drainage Repair and Slope Stabilization; 2) Drainage Maintenance /Streets; and 3) Buildings. Open Space Drainage Repair and Slope Stabilization A request was received from the resident at 7677 Topaz Circle regarding runoff from the Dougherty Hills Open Space Park above their property entering their backyard, as well as mud from the slope pushing up against their fence. MCE responded and placed sandbags to divert the runoff away from the fence and to the street. On March 29th, the City Engineer reviewed the site. There is 2 to 3 feet of mud/ silt pushed up against the back fence of the property. There is no drainage bench or ditch at the base of the slope to direct runoff around the property, as it was filled in from the debris slide. There are two benches on the slope above the property that convey runoff to a closed drainage system on the slope; the drainage inlet serving, one of the benches was partially blocked. Also observed was a sinkhole in the slope above the resident's backyard. The sinkhole appears to be in line with two squirrel holes. On March 31St, the City Engineer met at the site with Cal Engineering and Geology, a geotechnical engineering consulting firm with whom the City has an on-call contract. The consultant noted, in addition to sinkhole observed on March 29, two additional sinkholes above the drainage benches. The consultant believes that runoff that would normally be intercepted by the benches is disappearing into the upper sinkholes, and traveling underground through the squirrels tunnels to the lower sinkhole. This causes the runoff to bypass the bench and resurface on the slope above the backyard, accounting for the excess runoff directed against the property owners' back fence. Ongoing erosion from the sinkholes is the likely source of the mud that has been deposited along the fence. Photos of the site are included as Attachments 4-7. Recommended work to correct the problem includes: (1) removing the mud and debris along the fence; (2) excavating an earthen drainage ditch (reinforced with fabric) along the base of the fence to direct flows around the property; (3) excavating the sinkholes to expose and seal the subsurface tunneling, and backfilling the sinkholes with compacted earth and/ or rock; and (4) replacing the inlet at the upper bench with aside-opening inlet less prone to clogging. Staff proposes that a Capital Improvement Project be established at this time. The estimated cost including design and inspection is $110,000, which would be funded from the General Fund Reserves. By establishing the project now, Staff will have an opportunity to have contract design staff work on the project prior to the beginning of the new Fiscal Year. Page 2 of 5 Drainage Maintenance /Streets There are three locations where storm drainage systems failed to adequately handle the storm related flow. The first two locations are located within the public right-of-way and/or a public drainage easement that conveys flow off public streets, and Gas Tax could be a source of funding for this work. The first location is San Ramon Road adjacent to the Shannon Community Center. An aerial view of the site is included as Attachment 8. Runoff from Koopmann Canyon Creek spilled onto San Ramon Road at the Shannon Center, causing closure of the southbound outside vehicle lane and bicycle lane, as well as the adjoining bicycle/ pedestrian trail. The creek flows from west to east, between the Shannon Center and the parking lot; at San Ramon Road it makes a left turn to the north and flows parallel to the road before entering a culvert under the road. The man-made drainage ditch was constructed in 1996 along with the adjacent road work on San Ramon Road. Over time, sediment and debris has settled out in the channel, further reducing capacity. There is also evidence of sediment accumulating on the inside of the channel as it turns to the north at San Ramon Road, due to the flows slowing at this location and dropping sediment. During the March 24th storm, runoff overtopped the levee for a distance of 60', flowing over the trail and into the street. Due to the buildup of sediment, capacity appears to be compromised. There appears to be room between the top of the berm and trail to place addition fill to raise and reinforce the levee. By improving the levee and avoiding excavation within the channel, permitting from the State Department of Fish and Game and other resource agencies can be avoided. Approximately 100 cubic yards of fill would be needed. The fill would need to be hydroseeded. Consideration could be given to providing native landscaping on the larger levee; the area is currently not landscaped and has heavy weed growth. Placement of trees on the levee would also block sunlight to the channel, retarding the vegetation growth in the channel. The levee repairs would be supplemented by additional hand-removal of silt within the channel. The cost is estimated at $20,000 which includes $15,000 for the fill and $5,000 for trees and landscaping (presuming that existing irrigation connections can be utilized). It is proposed to use Gas Tax reserves to complete the work. The funding is proposed to be added to the current operating budget and will be carried over at year end if the work is not fully completed. The second location is on Padre Way where heavy flows from Clark Canyon Creek caused the trash rack at Padre Way to be plugged with debris and silt. The adjoining property owner called the City when rising floodwaters in the creek came close to spilling into his backyard. MCE responded and was able to remove the debris, lowering the water level and avoiding flooding. Access to the site is through Dolan Park and then across open space. Vehicle access is not possible and silt and debris must be removed by wheelbarrow. The trash rack was originally installed in the 1980's and is approaching thirty years of age; the trash rack has been damaged by the ongoing force of debris, and may not be structurally adequate to resist heavy flows. It is recommended that funding be provided to repair and strengthen the trash rack, to reconfigure the trash rack to better contain silt and debris while allowing the passage of heavy flows, and to improve access to the trash rack. Page 3 of 5 The estimated cost to desilt the line and make improvements to the trash rack is $20,000. It is proposed to use Gas Tax reserves to complete the work. The funding is proposed to be added to the current operating budget and will be carried over at year end if the work is not fully completed. Photos of the site are included as Attachments 9-11. The third location is at the end of Fenwick Way. Inspection by MCE of the trash rack during the storm showed that the trash rack had become plugged with silt, raising floodwater levels behind the rack. MCE was able to clear the silt and open the storm drain pipe. This rack was also installed in the 1980's; the existing trash rack has been warped and knocked out of place by the floodwaters and will no longer fully close, allowing debris and silt to enter the storm drain. The cost of replacing the trash rack is estimated at $5,000 and would proposed to be funded from General Fund reserves. The funding is proposed to be added to the current operating budget and will be carried over at year end if the work is not fully completed. A photo of the site is included as Attachment 12-13. City Buildings During the heavy storm events, the Dublin Civic Center experienced water intrusion at various locations throughout the facility. It was determined through inspections that some of the water leaks were due to the porous exterior natural tiles and concrete blocks. It is recommended that funding be provided to apply a sealant to the exterior wall surfaces of the Civic, Center facility. The estimated cost to reseal the Dublin Civic Center is $45,000. Staff has included a recommended appropriation from. the Building Internal Services Fund in the proposed Fiscal Year 2011 /2012 Operating Budget. RECOMMENDATION: The total cost of this work is estimated at approximately $200,000. The work is not covered under the City's self-insurance program. A Budget Change has been prepared which will create a Capital Project to address the Dougherty Hills Park item and the Storm Maintenance and Streets items are included. as Operating Budget items (Attachment 3). This will allow work to be completed over the 2011 construction season prior to the 2011-2012 Winter. NOTICING REQUIREMENTS/PUBLIC OUTREACH: None ATTACHMENTS: 1. Overall Location Map 2. Resolution Approving the Allocation of Funding for Storm Damage Repairs, Creating A New Capital Improvement Program, and Approving a Budget Adjustment 3. Budget Adjustment 4. Topaz Circle, Aerial Photo 5. Topaz Circle, Photo 6. Topaz Circle, Photo Page 4 of 5 7. Topaz Circle, Photo 8. San Ramon Road, Aerial Photo 9. Padre Way, Ae~rial.Photo 10. Padre Way, Photo 11. Padre Way, Photo 12. Fenwick Way, Aerial Photo 13. Fenwick Way, Photo I t i G:ICIPIMarch 20, 2011 Storm DamagelStaff Report March 2011 Storm Damage 5-17-11.doc I i i i ~ , i I i I I i i. i I i I I I i i i I Page 5 of 5 ~ - L 13 ~ - • • Fenwick Court ~ Topaz Circle . • • , 1' '1 - • t 1 ~ncnf . S , ~ • ~ Cent • ~ ! L, w ~ ~ Sta~ i Park .f• ~ ~ he r.~,~ ~ I 'ICIl1CI ' C ~'f'} Il 01 Ill Il t ' e11tCC 1 i 1 non 11°k 'c ~ ,Ji I~lI c of ~ ~ St ym St 'o t n ' . ter c A 1 erk tin _-~__tlt~_. 1 n Sports Gr u - ublin H r ~ Padre Way San Ramon Road i ATTACHMENT ~2 1`~'~ RESOLUTION NO. - 11 A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF DUBLIN ALLOCATING FUNDING FOR CITYWIDE STORM REPAIRS, WHEREAS, the City of Dublin, as well as much of Northern California, experienced heavy rainfall on the period of March 24th and March 25th; and WHEREAS, the storm required response by the City to address flooding or other issues at multiple locations; and WHEREAS, observations at a number of these locations reveals the need for further corrective work and/ or improvements to repair storm damage and/ or prevent a recurrence of the flooding or other problems during future storms; and WHEREAS, it is desirable to begin the design and construction process so that repairs and improvements can be completed during the 2011 construction season, prior to the 2011- . 2012 Winter; NOW, THEREFORE, BE IT RESOLVED that the City Council of the City of Dublin does create a new Capital Improvement Project for the 2010-2011 Fiscal Year, Dougherty Hills Park Slope /Drainage Repair and includes an appropriation of $110,000 for this project. BE IT FURTHER RESOLVED that the City Council appropriates additional operating budget funding as described in the' budget adjustment presented May 17, 2011, using the following sources of funding: $5,000 from the General Fund and $40,000 from Gas Tax Reserves to address Storm Drainage /Streets deficiencies. PASSED, APPROVED AND ADOPTED this 17th day of May, 2011, by the following vote: AYES: NOES: ABSENT: ABSTAIN: ATTEST: Mayor City Clerk G:\CIPWlarch 20, 2011 Storm Damage\reso March 2011 storm damage 5-17-11.doc TTACHMENT ~ A 3 ~ t CITY OF DUBLIN FY 2010 - 2011 BUDGET CHANGE FORM CHANGE FORM # New Appropriations (City Council Approval Required): Budget Transfers: X From Unappropriated Reserves From Budgeted Contingent Reserve (1001.1901-81101.) Within Same Department Activity From New Revenues* Between Departments (City Council Approval Regd) Other INCREASE BUDGET ACCOUNT AMOUNT Name: CIP EXPENDITURE: GENERAL FUND -Staff Costs - Dougherty Hills Slope/Drainage Repair Project # 950017.9100.9101.1001 $4,000 GL Account 3500.9501.51101 Name: CIP EXPENDITURE: GENERAL . FUND -Contract Services Dougherty Hills Slope/Drainage Repair Project # 950017.9200.9201.1001 $19,000 GL Account 3500.9501.640001 CIP Transfer Out: $110,000 Name: CIP EXPENDITURE: GENERAL General Fund 1001.1901.89101 FUND -Improvements Dougherty Hills Slope/Drainage Repair CIP Transferln: Parks CIP: #3500.9501:49999 $110,000 Project # 950017.9400.9401.1001 $87,000 GL Account 3500.9501.73103 Name: Op Budget Expenditure General Fund -Street Maintenance Improvements $5,000 GL Account 1001.3201.73103 " Name: Op Budget Expenditure Gas Tax Fund -Street Maintenance -Contract Services -Engineering $5,000 GL Account 2201.3201.64091 Name: Expenditure Gas Ta.x Fund - Street Maintenance -Improvements $35,000 GL Account 2201.3201.73103 _ ASD/Fin Mgr Date 5' it o Si nature REASON FOR BUDGET CHANGE ENTRY: To establish a budget to address maintenance items encountered in 2011 storms including: a new Capital Project Dougherty Hills Slope /Drainage Repair project; street drainage at Padre Way as well as San Ramon Road at Shannon Ave; and a drainage trash rack on Fenwick Way as presented to the City Council on May 17, 2011. City Manage ~ T ~i~~l.~.~.u Date Signature ~ approved at the City Council Meeting on: Date 5/17/2011 , Mayor: Date Signature Posted By: Date Signature ATTACHMENT 3 I'3 Topaz Circle - J ~ .r ~ C ,JL J.~_ i [1 ~ ~ Y y Si + ~ r ti r i b 3• ! . , ~ ~ _ '1 cw h Xn ~~Y 4•~ a`~ i ~ I •i ~ ~ 1 Lf r~ 4 s.y, ~ - ~ !mil v, . 1 f ir•~•~i~1 ATTACHMENT ~ C `y J r ~ ~ , + • ~r~ ~ t ~ ~ ` ~ 1 "1 a 3.~4 ~ ! * ~ _ +y~- :-,v ~ ~r'~ »~~.f 1 M ` _ ~ X43'. • T_ •~i. ^I. ~ a:-_, ~•i f.'~~~ S`. ~I !ice f•ta '~~I rA' ` J~' } ~-~L Jr ~ Nt~~~ ~ ~ ..1 ~ ~3~'~lx t ~ r'f~:. bs ~~~1+~~ Vt~u_ ,k , . , , !f ~,i ~ 1 • - *'~t . +t r. .n' r ~ > r- . ~ ~ ~ ATTACHMENT s 3 .y _ ~ }i,' r ~ ' _ .j ~ ; N?:~ ~ i - o s,: ~ ` ~ - - ~ l t ~""t' ' - s r 1 ~ ~ ~c .-..C~ y.: ~ F • _ - - - . - --yr ~ _ M - ~ . y _ _ ~ ~ 3 ~ i + ~ , bI.' ' y - i ~M i _e' _ ~a 4` ~ o e l _ ~ ~ ~3 ~ _ _ ~ ~ ~ L ~k' ~ j .1~ ,t ~ i ~ Tit+' ,4 i:. d~'~ v` ,i .t - ti ~ 'i ~ ATTACHMENT L .t . A~ ~ ~ ~A.~<_~~Y lit ..q ~ ! _ n t i ~ _ h. 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' ' ~ tit ~ j° ~e ~r _ cl r x ~ : ~ ~ ~s' to rtt~ ti: . >.r.. , ~ ~3 San Ramon Road/ Shannon Center I ~ - -hr _ i t~'~ ~ L~ - ~ x+s 'd, r t i~ ' y. ~ 4- F ~ F;~ , ~ ` i ~ ~ a ' * ~ ~ " , i 1 r } .,t ~ - k ~ ~ ATTACHMENT 8' Q t I~ Padre Way Trash Rack 'f r. . _ L` 1, 4x - f ~~z e~ - ~ 1~i '~s l is . t f _ t ~ ~ • ' i ~IG ' }p~'>~ f ,I ~f ~ I I ~F ~ r~ • J ,J ~ I jiyy~ ~ i ' ~ 1 1> ~w J ~ ~ { Ii J ATTACHMENT j' c : '49j' . s ~ . ,t 'R i' Jay ~ ~ _ ~ s ~ r. { ~ ~ ` ~ h ~ T tr ` i' f~~R~' ~ ~T ~ F~ jr4l~" €~~.~aj, 31 _ i' i t ~ _ ~ ~ r) ~ ~ . i, , ` ~ } j r ~ l• 1 } l3 ~~4~~ 4 S r gat + ,1( 3 7 1 'q~~y t - ~ ' ~ q~,/ ~ ' ~ Y. • d ,t id~ ` r ~ ~ ~ ~ ~ ~ 1 1 ' J.,, , . i=' I ~ . . r.K; - . .~T ~ _ llo~~~ ~ Y ~ r~}3 ' Q T 'f . w ~ - ' , 1 t ~ t ~ ' ~ ~ + ~ s, r •L i'ce'' ' t ' ' j + ~ a i t ~;b rt ~ i a, i i1.. ~ Y Y J ~F s Ft ~ ~ Y Jay, i~ 'j i 7 ; , ,~i~ i~p y S } ~t rr',. 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