HomeMy WebLinkAbout07.a. (Handout) Updated Presentation w y Item 7.a.
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ANNUAL REPORT OF SANITARY
SEWER OVERFLOWS
Y Paul A. Seitz
Division Manager
_} - Collection System Operations Division
February 15, 2018
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COLLECTION SYSTEM OPERATIONS
MAIN FUNCTIONS
Cleaning Sewers
Televising Sewers
� Repairing Sewers
SEWER CLEANING CRITERIA
Cleaning Frequencies vary based on :
Prior Cleaning results
CCTV inspections
Overflows and stoppages
Age
Pipe material
Pipe size
SEWER GLEANING FREOP IENCIFS
Based on criteria schedules will vary from 1
— 120 months for sewers 18-inch or less in
diameter
"Hot Spot" or problem sewer mains are
cleaned repeatedly on a 1 , 2 , or 3 month
schedule
New sewers are initially assigned to a 120
month schedule
ANNUAL CLEANING STATISTICS
In Calendar Year 2017 , CSO
cleaned 759 miles
1 , 2 and 3 months schedules ( hot
spots ) accounted for 179 miles
SEWER T LEVISING - :) CRITERIA
CSO CCTV staff televise sewers for
Quality assurance and quality control of
CSO cleaning practices
New sewer line acceptance
Review after all overflows and stoppages
Unscheduled work orders to address issues
discovered during cleanings , such as rocks,
debris, other obstructions
SEWER T- LEVISING - DISTRICT PROGRAM
Ongoing program to assess the District's
pipelines , with a goal to inspect sewers at
least once every 10 years .
Criteria for televising sewers
Maintenance issues
Previous televising results
Defect score
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ANNUAL TELEVISING STATISTICS
In Calendar Year 2017 , 167 miles of
sanitary sewers were televised
CSO televised 55 miles
Roto-Rooter televised 112 miles
SEWER REPAIRS
Spot repairs are made to the collection
system which allows CSO to extend
cleaning frequencies
A spot repair is a repair to the collection
system that consists of installation of new
pipe or an internal permaliner repair.
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SEWER REPAIR STATISTICS
70 spot repairs were completed .
60 structure adjustments were made in
the public right of way and on private
property.
2017 SANITARY SEWER OVERFLOWS
38 Overflows
2 . 50 Overflows per 100 Miles
No Capacity Overflows
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COMPARATIVE DATA FOR 2017
FROM STATE DATABASE
REGION
Number of 31149 11001 38
Ove rf I ows
Total Volume 38,687,984 13,168,882 330,226
(Gallons)
Overflows per
4.22 6.62 2.50
100 Miles
Average Volume 121286 13,156 81690
per SSO (Gallons)
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* Information from CIWQS as of 1/30/18
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OVERFLOWS COMPARISON
1999 =2017
NUMBER OF OVERFLOWS
180 -
162
160 143 141
140 135
123
120 107
100 81 86
84 _ _�1�- 73
63
60 - 43 49 48 49 43
40 - - 37 44 38
20
0 -
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
OVERFLOW QUANTITIES
Size of • (Gallons) Number in 2016 Number in 2017
Greater Than or 4 4
Equal to 1,000
Between 100 and 999 12 10
Between 10 and 99 16 18
Less Than 10 8 6
Total Overflow Volume 29,200 gallons 330,226 gallons*
* The SSO on Miner Road (243,100 gallons) and Reliez Valley Road (79,045
. gallons) attributed 97.6% of the total overflow volume in 2017
2017 O
BY CITY
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Alamo Lafayette Martinez Orinda Pleasant San Walnut
Hill Ramon Creek
CITY
2017 OVERFLOW CAUSES
Other Plug, 13%
Physical Defect,
5%
Rags, Rock, Debris,
8%
Grease, 5%
Roots, 68%
2017 OVERFLOWS
BY PIPE SIZE AND TYPE
■ABS ■ACP ■ CIP ■ HDPE PVC VCP
25
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6" 8" 10" 12" 18"
PIPE SIZE
CATEGORY 1 OVERFLOWS
(ANY VOLUME OF WASTEWATER THAT REACHES THE WATERS OF THE STATE
9
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2012 2013 2014 2015 2016 2017
YEAR
•
Miner Road Emergency Response
Installation and implementation of new software: Cityworks, IT Pipes and Dig Smart
Implementation of new hardware: (pads
SSMP — 5 year Update
Accomplished over 16,156 cleaning schedules and work orders that were completed on
schedule 99% of the time.
Received and cleared over 26,000 USA requests on time.
Completed 987 services on vehicles and equipment. DOT regulated services were
completed on schedule 100% of the time. Up time for vehicles was greater than 95%.
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Conducted survey of 100% of all customers' emergency calls.
197 Customer Surveys were sent to ratepayers. 46 surveys were
submitted for a return rate of 23%.
Average Customer Service rating was 3.97 out of 4.0.
Received a rating of 4.0 for 10 months of the year.
Average response time was 40.7 minutes.
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STRATEGIC PLAN METRICS
GOAL 2 - MEET REGULATORY
REQUIRE " FENTS
metric Actual (CY 2017)A
SSO's / 100 miles 3.0 per 100 miles 2.50 per 100 miles
Spills to Public Waters Less than 3 7
of Spill less than 500 Greater than 95% 82%
gallons
Cleaning schedules Greater than 95% 96.46%
completed on time
Cleaning QA/QC 3% of pipelines cleaned 2.84%
QA/QC Pass Rate Greater than 98% 97%
Clean >800 miles of Greater than 800 miles 759 miles
pipeline
CCTV >150 miles of Greater than 150 miles 167 miles (CSO-55 miles;
pipeline Roto Rooter-112 miles)
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STRATEGIC PLAN METRICS
GOAL 1 - CUSTOMER SERVICE
,.Met Actual (CY 2017)
Response time Less than 20 36.5 minutes
during working minutes
hours
Response time Less than 30 40.75 minutes
after hours minutes
Average Customer Greater than 3.8 3.97
Service Rating out of 4
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Questions ?.
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