Laserfiche WebLink
The project consists of the application of a root herbicide to retard and kill root growth present in <br /> and around the targeted sewer lines. The herbicide chemical is combined with a foaming agent <br /> that is applied by means of jetting equipment to coat the inside of the sewer pipe. Foam fills the <br /> pipe and causes the herbicide to cover and stick to any tree roots that it comes in contact with. <br /> The herbicide proceeds to kill the roots that are in the pipe and within a short distance of the <br /> outer wall while leaving the main tree structure undamaged. The effects of the herbicide <br /> generally last between 2 to 3 years depending on the frequency of application. <br /> One application will not solve all future root intrusions in the pipe as the roots will eventually <br /> grow back. This project is structured to begin a yearly herbicide application to control root <br /> intrusions into the sewer system by applying herbicide to a third of the identified root susceptible <br /> pipes in the City each year as shown on the attached map. The current project is for 3 years. <br /> The schedule for the current project and future projects is outlined in Table 1: <br /> Table 1 <br /> Zone <br /> Year 1st 2nd 3rd 4th Status <br /> Application Application Application Application <br /> 2014 1 <br /> 2015 2 Current <br /> Project <br /> 2016 1 3 1 <br /> 2017 2 <br /> 2018 3 <br /> 2019 1 <br /> 2020 2 Future <br /> 2021 3 Proj ects <br /> 2022 1 <br /> 2023 2 <br /> 2024 3 <br /> Project locations have been identified through the City's televised sewer inspection program. <br /> The herbicide root control program is intended to supplement ongoing root cutting work <br /> performed by City maintenance crews. The herbicide root control program will enable City <br /> maintenance crews to work on other high priority maintenance needs such as de-greasing sewers <br /> and making repairs. Using a root control herbicide will extend the service life of sewer pipes <br /> because continual root cutting uses rotating saws and chains that tend to damage the sewer over <br /> time and when roots are cut they grow back thicker, larger and stronger eventually breaking the <br /> joint or crack the root originally penetrated through. <br /> Project Bid Review <br /> The project plans and specifications were prepared by Engineering Division staff. The Contract <br /> language was reviewed and approved by the Legal Department. The project was advertised <br /> Page 12 <br />