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HomeMy WebLinkAboutItem 8.1 Truncated Domes CITY CLERK File # nlð1~[QJ-~~ . AGENDA STATEMENT CITY COUNCIL MEETING DATE: December 7,2004 SUBJECT: Approval of Color of Truncated Domes Report Prepared by: Melissa Morton, Public Works Director ATTACHMENTS: I) 2) Resolution approving Color of Truncated Domes Photograph of installed domes and standard plan drawings RECOMMENDATION: ~ FINANCIAL "'A~' Adopt resolution approving the color of Federal Yellow for Truncated Domesto be placed in handicap ramps. There is no Financial Impact to the City. DESCRIPTION: A number of questions have been raised by various agencies concerning the use of detectable warnings, specifically truncated domes, when constructing or altering curb ramps. Truncated domes are the standard design requirement for detectable warnings for determining the boundary between the sidewalk and street by people with visual disabilities. _Detectable warnings (truncated doinesr'~re required in 1991 by the Americans with Disabilities Act Accessible Guideline (ADAAG) (regulatory standards) for hazardous vehicular ways, transit platform edges, and curb ramps. A suspension was placed on requiring detectable warnings at curb ramps and hazardous vehicular ways, but not for transit platform edges, in order to conduct research on the performance of detectability. The DOJ (Department of Justice) continued the suspension through July 26, 200 I, allowing 10 years to conduct research. The research determined that other designs used in place of truncated domes such as grooves, striations, and exposed aggregate, were not detectable in the sidewalk and roadwayenvirorunent due to similarities to other surface textures and defects. Truncated domes are a unique design that can be detected underfoot and with a cane. Other surfaces are not considered ADA equivalent and, therefore, do not comply with ADA requirements. Both the FHW A (the Federal Highway Administration) and the U.S. Access Board are encouraging use of the new design over the original. Choosing which color of truncated domes to be used has been a challenge since the guideline only requires the color to contrast with the color of adjoining surfaces. However, CalTrans recently adopted the Federal Yellow color as its standard, as have many other cities. The choice of yellow has been used in the past per California Building Code, Title 24; at transit boarding platforms, and yellow is the last visible color to be seen by someone before completely losing their eyesight. Most of the City's standards refer to CalTrans Standards and Specifications for construction; and although manufacturers have other colors available, Staff recommends using the Federal Yellow color for the aforementioned reasons. Therefore, Staff recommends that the City Council adopt the Resolution approving the color of Federal . :~1~0~~ f~~ ~~~c~a~e~ ~~~~s_ t~ ~~ ~I~~~ ~n~ ~~~i~a~ :~~s~ _ ~ ~ _ " " " " ~ _ _ ~ _ _ _ . ~ . . ~ . ~ ~ . . . COPIES TO: G;IADA UpgredolAGST_truncated dome"doc I~ ITEM NO. .8.1 1~1 RESOLUTION NO. - 04 · A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF DUBLIN ********* APPROVING THE COLOR OF TRUNCATED DOMES WHEREAS, raised truncated domes are standard curb ramp detectable warning devices approved by the Americans with Disabilities Act (ADA) and Federal Highway Administration (FHW A) for visually impaired individuals; and WHEREAS, yellow colored truncated domes have been used at transit boarding platforms, and said color is the last color visible to a person prior to complete loss of vision. WHEREAS, the California Department of Transportation Standard Plans and Specification was recently revised to incorporate yel10w colored (Federal Yellow) raised truncated domes for installation at curb ramps in public works/transportation types of projects; and WHEREAS, the California Department of Transportation Standard Plans and Specification is the adopted standard for the City of Dublin; and NOW, THEREFORE, BE IT RESOLVEDthat said yellow-colored raised truncated domes are hereby approved for installation within public and private right-of-way in the City of Dublin. · . . ..... ... - PASSED, APPROVED AND ADOPTED this 7th day of December, 2004. AYES: NOES: ABSENT: ABSTAIN: Mayor ATTEST: City Clerk · Ù'ADA Upgrsde\RESO_trunc.ateò dorn~s.d()c \2 -j -'0 '-'\ £,. \ ATTACmNT I. · · · ~1j'\- New Curb-Ramps with Truncated Domes in Livermore ATTACDT L . . >- \,,9¡ó :;J~ 2.35' APART NOTES \'I1DTH OF SIDEWALK PER PARKING PLAN - 'i¡¡ IF A WALK CROSSES OR ADJOINS A VEHICULAR WAY, AND THE WALKING SURFACES ARE NOT SEPARATED BY CURBS, RAILING, OR OTHER ElEMENTS BETWEEN THE PEDESTRIAN AREAS AND THE VEHICULAR AREAS, THE BOUNDARY BETVÆEN THE AREAS SHALL BE DEFINED BY A CONTINUOUS, YELLOW. DETECTABLE WARNING \\HICH IS THE SAME \'I1DTH AS THE WALKWAY AND A DEPTH Of 3S' ---.,'.',-'."'. r-·'·'· @ @ @ @ @ @ © @ @ @ @ @ @ @ © @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ~ @ @ @ @ @ ~ @ @ @ @ @ @ © @ @ @ @ @ © @ © @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ © @ @ @ @ @ @ @ C?j 0.) @ (R) @ @ © @ @ @ @ l'd):<C @ @ @ @ (¡¿J i,~) ,@ @_@.@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ w © @ @ @ © @ @ @ © @ @ @ @ @ © @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ © @ @ @ @ @ @ © @ @ @ @ @ @ @ @ @ @ © © © © @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ © @ ~ ~ @ © @ @ @ @ @ @ @ @ @ @ @ @ © @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ © @ @ @ @ @ @ @ © @ @ @ ~ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ © @ @ @ @ @ @ @ @ @ @ © @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ © @ © @ @ @ @ @ @ @ @ © @ @ ~ @ @ @ @ @ © @ @ @ @ @ @ ~ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ © © © @ @ © @ @ @ @ © © @ @ @ © @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ © @ @ @ @ @ @ @ @ @ @ © @ @ @ @ @ @ @ @ @ @ @ @ @ @ @"@.@ @ @ @ @ @ @ @ @ @ @ © @ @ © @ @ @ @ © @ @"@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ © @ @ @ @ @ @ @ @ @ @ © @ @ @ @ @ @ @ © @ @ @ @ @ @ @ @ @ @ @ @ @ @ @,@ © © ~ @ @ @ @,@,@ @ @ @ © @ @ @ © @ @ @ @ © @ @ @ @ @"@ @ @ @ ~ © @.@ @ @ @ @ © @ @ @ @ @ @ @ @ @ @ © @ © @ @ @ @ @ @ @ @ @ ~ @ @ © @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @,@ @ @ ~ @ @ '@ © @,@ @, @ -@ @ @ @ @ © @ @ @ @ © © @ @ @ © @ @ @ @ @ @ @ @ y~ ,---- L67' APPROK - _0.9' AT BASE 0.2' HT l OA5' rr-rö1 { TAPERED EDGES \\HERE EXPOSED 1/ SECTION A-A -....... TRUNCATED OOMES SCALE: NOT TO SCALE DATE: DRAWN BY: LDH V: \CAD\STDS\CD- APPROVED: -".._,,,,,_.,- PUBLIC WORKS DIRECTOR CD- · ,,,,*,/13'}F .-::::~:::~... 6'~ I u #..~-t 12,~11 GROOVED BORDER (CD-,.....j --111 MUST BE ON THE LEVEL SURFACE --' I AT THE TOP OF THE RAMP , ___- IiQIE;. CROSS SLOPE OF LANDING AREA DOES / NOT EXCEED 2 ¡ IN ANY DIRECTION /' ~¥o' / Þi ;;/-- ................ ..----..----- -"-< \ , . -j'\ v."t,:?",-- '\ ,-~ ... '1Þc-/ -- ...." "'- /-"'"':>~'" . -0l/":S .' ,., ", TRAN~mNS FRO: RAMPS TO w:LKs<2;':--S~TR:~:S ,__J SHALL BE FLUSH AND FREE OF ABRUPT CHANGES. · NOTE: 1. IF X IS LESS THAN 48' THEN THE SLOPE OF THE FANNED OR FLARED SIDE MAY NOT EXCEED 1:12 (8,33%) FlARED CURB-cuT RAMP SCALE: NOT TO SCALE DATE: DRAWN BY: LDH V: \CAD\STDS\CD- APPROVED: · PUBLIC WORKS DIRECTOR CD-