HomeMy WebLinkAboutStaff Report 192-10TO:
FROM:
DATE:
City of Palo Alto
City Manager's Report
HONORABLE CITY COUNCIL
CITY MANAGER DEPARTMENT: PUBLIC WORKS
APRIL 5, 2010 CMR:I92:10
REPORT TYPE: INFORMATION
SUBJECT: Bay Area Pavement Condition Summary and the City of Palo Alto
Pavement Management and Maintenance System (PMMS)
This is an infonnational report and no Council action is required.
BACKGROUND
The City of Palo Alto has been utilizing a customized Pavement Management and Maintenance
System (PMMS) since the 1980's to manage its street maintenance inventory and condition.
Condition scores are detennined by bi-annual visual street survey results along with age and type
of street construction. In the early 1980's the Metropolitan Transportation Commission's (MTC)
developed a software program, Streetsaver, which it sold to government jurisdictions. Due to the
fact that the City's PMMS utilizes our sophisticated Geographic Information System (GIS) in
addition to pavement condition scoring, Public Works staff chose to retain their current system.
The City's PMMS system utilized a more complex scoring system than Streetsaver and was
accepted and certified by the MTC bi-annually.
In 2006, the City Auditor's Street Maintenance Audit recommended 21 goals of which 19 were
achieved within one year of the audit. Goal number 20 recommended the Public Works
Department either modernize or modify the City'S in-house PMMS software to be an equal to the
MTC's Streetsaver or to purchase and use Streetsaver while abandoning the City's PMMS.
The auditor's recommendation number 21 was to have the City of Palo Alto's Pavement
Condition Index (PCI) score included in the annual MTC pavement condition summary for cities
in the San Francisco Bay Area. The PCI is a computer generated score derived from pavement
distresses that are characteristic in asphalt paving degradations. MTC considers pavements with
a PCI score of 90 or greater to be in "excellent" condition and a pavement section with a PCI
score of below 25 is considered "failed." (Attachment A). Even though the MTC had certified
Palo Alto's PMMS as an effective pavement management system; they would not allow the City
of Palo Alto's PCI score to be included in the annual report due to differences in the two distinct
database sets bf pavement infonnation and software. According to MTC, 109 jurisdictions in the
Bay Area use Streetsaver and only two jurisdictions do not -Walnut Creek and Palo Alto. As a
result, MTC reported that it had difficulty comparing Palo Alto's streets to the rest of the Bay
Area and would not include the City's overall pavement condition with other cities.
CMR:192.10 Page 1 of3
DISCUSSION
In order for MTC to report the City's pavement condition and to retain the City of Palo Alto's
GIS capabilities of the PMMS, the City hired Nichols Consulting, a third party consulting agency
to create a correlation so that the two inspection methods and corresponding PCI scores would be
sufficiently equivalent to allow MTC to include Palo Alto's scores in the annual report.
Nichols conducted their pavement inspection using a statistical analysis of random sampling to
calculate a PCI to attempt to correlate with the City's older inspection methods. Nichols and
Streetsaver only require a 10% sampling of each pavement section to determine a PCI score.
The City of Palo Alto uses the entire pavement section to determine a PCI score. The results of
the original correlation were not favorable due to different data collection, recording and PCI
mathematical formula calculations and methodologies. Thus the City adopted the identical data
collection and recording methodology as StreetSaver, while maintaining its current methods of
pavement inspection. In addition the City of Palo Alto was granted access to the PCI encoding
and calculations as used by Streetsaver used to obtain the PCI. The PMMS now uses this
identical log function in its PCI algorithm calculation for PCI scores. By inspecting each
pavement section in its entirety, provides the City of Palo Alto with accurate pavement
information that statistical sampling cannot compete with. Thus our PCI scores are created using
a 100% percentile sampling curve, while StreetSaver can only ever achieve a 95 th percentile
curve due to random sampling. That being said, our scores will be more conservative and
accurate. Both Streetsaver and PMMS are now able to calculate identical PCl's utilizing this
data.
Staff believes it is important to retain the PMMS because of its direct integration with the City's
Geographical Information System (GIS), utilized and available to all City employees. The
benefits thus allow Public Works Engineering to continue coordinating streetwork and utility
improvements with the Utilities Department and other user groups to avoid trenching newly
paved roads allowing Palo Alto to be the only City in the Bay Area to have this capability.
As a result of the work by Nichols, Geodesy and Public Works Engineering staff, the MTC
accepted the City's 2009 average PCI score of 72 and for the fust time included it in the 2009
Pavement Conditions of Bay Area Jurisdictions report. The report, included as Attachment A,
i1lustrates that the PCI of Palo Alto is actually 6 points better than the average Bay Area city
score of 66. After completing the City of Palo Alto's 2009 preventative maintenance program
and the annual asphalt overlay program, the average PCI has jumped from 72 to 74. Public
Works Staff expects the City PCI to rise even more quickly with a greater investment in the
Street Resurfacing Program.
POLICY IMPLICATIONS
Implementation ofthe final responses to the 2006 Street Maintenance Audit recommendations is
consistent with existing City policies.
ENVIRONMENTAL REVIEW
No environmental review is required.
CMR:192.10 Page 2 of3
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ATTACHMENTS
Attachment A: pcr Breakdown of Palo Alto.Streets using MTC's Point Scale
Attachment B: Pavement Conditions of BayArea Jurisdictions (2009)
PREPARED BY:
DEPARTMENT HEAD:
CITY MANAGER APPROVAL:
CMR:192.10
~.:dk
MURDO NICOLSON
GLENN S. ROBERTS
Director of Public Works
c
Page 3 of3
Attachment A
PCI Breakdown of Palo Alto Streets using MTC's Point Scale
PCI PAVEMENT AREA(SF) % PAVEMENT AREA BREAKDOWN LANE MILES
90-100 9596241 26% excellent 121.2.
"
80-89 8969971 24% very good 113.3
70-79 5192875 14% good . 65.6
60-69 3070261 8% fair 38.8
50-59 3674568 10% at risk 46.4 .
25-49 4855111 13% poor 61.3 ..
0-24 1832453 5% failed 23.1 -
37191480 100% 469.6
NOTES:
1. Please note that in Attachment B, there are no cities in the PCI condition summary with an average score of "excellent"
or "failed", as none of the 109 Bay Area jurisdictions average PCI scores met those criteria.
2. The City of Palo Alto's average PCI score of 72 was generated from the data in this table.
-
-"
Attachment B
Pavement Condition
Of Bay Area Jurisdictions
2009
Pavement Condition Index (PCI). for Bay Area Jnrisdictions, 2009
Total
Jurisdiction County Lane Miles 2005 2006 2007 2009 1
Very Good (PCI = 80-89)
Brentwood Contra Costa 379 83 85 84 85
Los Altos Santa Clara 226 84 85 84 83
Foster City San Mateo 121 80 82 83 82
Belvedere Marin 24 81 81 79 82
Santa Clara Santa Clara 596 84 83 82 82
Dublin Alameda 228 79 80 80 80
Contra Costa County Contra Costa 1,323 85 83 82 80
Good (PCI=70-79)
Sonoma Sonoma 68 77 80 79 79
Gilroy Santa Clara 243 79 82 80 79
Concord Contra Costa 706 78 78 78 78
Livermore Alameda 639 78 79 79 78
Oakley Contra Costa 206 86 83 80 78'
Vacaville Solano 533 76 78 79 77
Redwood City San Mateo 353 74 74 76 77
Pleasanton Alameda 498 71 74 75 76
Union City Alameda 330 76 76 75 76'
San Pablo Contra Costa 102 65 67 72 76
Brisbane San Mateo 57 68 70 73 76
Emeryville Alameda 47 73 76 79 76**
Clayton Contra Costa 90 72 75 77 76
Dixon Solano 129 79 81 77 76
Los Altos Hills Santa Clara 113 73 74 75 76
Morgan Hili Santa Clara 259 71 71 75 76
American Canyon Napa 102 76 76 76 75
Burlingame San Mateo 162 66 68 72 75
Campbell Santa Clara 218 79 78 76 75
Daly City San Mateo 253 70 70 73 75
Mountain View Santa Clara 329 75 74 74 75
Santa Clara County Santa Clara 1,501 74 75 77 75
Pavement Condition Inde. (PCI) for Bay Are. Jurisdictions, 2009 (continued)
Total
Jurisdiction County Lane Miles 2005 2006 2007 2009 1
Sunnyvale Santa Clara 513 83 80 77 74
San Ramon Contra Costa 399 74 74 73 74
Windsor Sonoma 158 75 74 75 74
walnut Creek Contra Costa 436 NA 72 74 73
Fairfield Solano 702 78 77 75 73
Hercules Contra Costa 124 72 75 74 73-
Corte Madera Marin 64 71 73 73 73
Atherton San Mateo 106 68 68 69 73
Danville C,ontra Costa 319 75 74 73 72
Saratoga Santa Clara 281 67 70 71 72-
Alameda County Alameda 997 70 69 71 72
Palo Alto Santa Clara 470 NA NA NA 72'
South San Francisco San Mateo 297 68 67 71 72
Los Gatos Santa Clara 218 70 .72 73 72
Cloverdale Sonoma 64 68 69 71 72.
Lafayette Contra Costa 202 60 64 70 71
Novato Marin 318 64 65 67 n
Cupertino Santa Clara 303 69 69 70 70
San Rafael Marin 331 63 63 66 70
San Carlos San Mateo 175 67 68 69 70
San Mateo San Mateo 409 58 61 67 70
Antioch Contra Costa 599 71 70 70 70
Pinole Contra Costa 118 73 71 71 70
Milpitas Santc! Clara 279 69 70 70 70
Fair (PCI = 60-69)
Piedmont Alameda 78 67 67 67 69
Fairfax Marin 53 65 69 70 69-
Hillsborough San Mateo 164 57 64 66 69-
Newark Alameda 252 77 75 71 69-
Hayward Alameda 625 66 68 68 69
Ross Marin 22 61 64 65 69
San Mateo County San Mateo 634 64 65 67 68
,{
Pavement Condition Index (PCI) 'Dr Bay Ar,ea Jurisdiction., 2009 (continued)
Total
Jurisdiction County Lane Miles 2005 2006 2007 2009'
Monte Sereno Santa Clara 31 59 65 70 68'"
Tiburon Marin 67 61 64 67 67
Portola Valley San Mateo 71 66 64 63 67
Healdsburg Sonoma 91 66 66 66 67
Yountville Napa 17 67 67 65 67
Colma San Mateo 23 58 67 72 67
Rohnert Park Sonoma 205 70 68 67 67
Sebastopol Sonoma 47 63 67 67 66
Fremont Alameda 1,063 71 70 68 66
Benicia Solano 190 70 70 68 66
Pleasant Hili Contra Costa 242 62 62 65 65
Sausalito Marin 54 67 69 68 65
Santa-Rosa Sonoma 1,090 64 64 64 65
Pittsburg Contra Costa 316 63 65 64 64
Cotati SOnoma 46 68 66 66 64
Solano County Solano 1,165 59 58 61 64
Albany Alameda 59 60 62 63 63
San Francisco San Francisco 2,112 65 64 64 63'
San Bruno San Mateo 178 62 62 64 63
San Jose Santa Clara 4,186 65 63 63 63
Alameda Alameda 315 66 63 63 62'
Menlo Park San Mateo 200 61 62 62 62
Belmont San Mateo .135 61 61 61 61'
Half Moon Bay San Mateo 55 56 55 59 61
Mill Valley Marin 117 64 64 62 60
Berkeley Alameda 453 63 62 60 60
"
Pavement Condition Index (PCI) for Bay Area Jurisdictions, 2009 (continued)
Total
Jurisdiction County Lane Miles 2005 2006 2007 2009 '
At·Rlsk (PCI=50-59)
Martinez Contra Costa 233 58 57 57 59*
Calistoga Napa 29 58 57 57 59
Pacifica San Mateo 189 68 64 60 59
Moraga Contra Costa 110 62 61 60 59
Oakland Alameda 1,964 55 56 57 58'
San Leandro Alameda 392 63 62 60 58
Millbrae San Mateo 124 62 60 57 57
Woodside San Mateo 97 63 62 60 57*
San Anselmo Marin 80 60 59 58 57*
Suisun City Solano 150 56 53 50 55
Petaluma Sonoma 390 63 60 57 55
Napa Napa 464 53 52 53 55
Napa County Napa 836 57 54 51 55
Richmond Contra Costa 549 49 46 50 53
Vallejo Solano 676 54 54 54 53
East Palo Alto San Mateo 80 63 60 56 52*
EI Cerrito Contra Costa 138 57 53 50 50*
Marin County Marin 848 50 48 49 50
Poor (PCI = 25-49)
Orinda Contra Costa 192 56 46 47 48
St. Helena Napa 51 60 58 53 48**
Larkspur Marin 63 53 51 48 47
Rio Vista Solano 45 55 51 48 45**
Sonoma County Sonoma 2,720 45 44 44 44
Regional 42,492 63 64 65 66
Notes:
Where "NA" is indicated, the Jurisdiction uses a pavement management software that does not use PCI scale.
1 Increased utilization of online reporting options by many jurisdictions In 2009 allowed MTC to collect and tabulate 2009 pavement condition data,
even as 2008 data was still being compiled. To simplify reporting, MTC has decided not to separately report 2008 data, electing instead to bring
all PCI data up to date as of 2009. The reported 2009 three·year moving average Is computed from the individual·year scores for 2006, 2007
and 2009.
:2 This is the first year of reporting by Palo Alto, No average was computed.
3 PCI has been correlated from an alternative condition scale to the PCI scale,
4' Three-year moving average score is an estimate based on inspections done in 2007.
U Three-year moving average score Is an estimate based on inspections done In 2006 or earlier.