Agmt18 National Plant Services, Inc.

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and be equipped with approximately 800 linear feet of hose. Contractor's operating technicians shall have a minimum of 3 years of experience cleaning with this piece of equipment. Contractor shall clean the lines in a downstream direction, beginning from the most upstream manhole of a particular reach or set of reaches, and begin cleaning so that the debris will continually be pulled downstream. In order to jet clean the lines, a high pressure water pump on the combination truck shall deliver water from attached tanks through a high pressure hose to a cleaning nozzle. The water pumped through the cleaning nozzle shall propel the nozzle and attached high pressure hose through the sewer and/or storm drain pipelines. Once the cleaning nozzle has arrived at an upstream manhole, the nozzle shall be pulled back through the pipe at a velocity controlled by the operator. During the cleaning process, the cleaning nozzle will not travel faster than one foot per second in the line. While the cleaning nozzle is pulled back, the vacuum system shall be used to simultaneously remove debris flushed by the cleaning nozzle. Contractor shall use a root cutting nozzle to remove all debris. The root cutting nozzle shall revolve 360 degrees, be capable of cleaning 4" to 78" diameter sewer and/or storm drain pipe lines, and operate at 80 gallons per minute at a pressure of 3,000 pounds per square inch. Dislodged roots shall be captured and removed from the line either by the vacuum or a basket. The Contractor shall remove all sludge, dirt, sand, rocks, roots, grease and other solid or semisolid material resulting from the cleaning operation at the downstream manhole of the section being cleaned. Procedure for removing roots may include the use of mechanical equipment such as rodding machines and bucket machines using root cutters and porcupines. Passing material from manhole section to manhole section which could cause line stoppages, accumulations of sand in wet wells, or damage pumping equipment, shall not be permitted. Chemical root treatment shall not be used by the Contractor. Although hazardous materials are not expected, the Contractor shall contact the City, if such materials are found. The Contractor is responsible for proper removal and disposal of any found hazardous materials in accordance with all applicable federal, state and local laws, regulations, orders and other requirements. Hazardous materials shall only be removed by approved hazardous material sub-contractor(s). No additional compensation shall be given for disposal of material. The Contractor shall dispose all solids or semisolids resulting from the cleaning operations from the site at a suitably sanitary landfill site as defined by the Titles 22 and 23 of the California Administrative Code. Under no circumstances will the Contractor will be allowed to accumulate debris on the site. The Contractor will be allowed to store a debris container in the City Public Works Department corporation yard. The removal and disposal of solids shall be included in the agreed cost. If the Contractor encounters a surcharging manhole (flow exceeds the diameter of the sewer and/ or storm drain pipelines), the Contractor shall immediately notify the City Public Works Department at (650-780-7464) and provide information on the cause of the blockage. Page 7 of 14 REV: 06-29-18 PR ATTY/AGR.2018.148/National Plant Services, Inc.