San Lorenzo River Levee Burrowing Rodent Mitigation Project

The City of Santa Cruz Public Works Department is seeking a contractor to implement a burrowing rodent management program on the San Lorenzo River Levees. This program is anticipated to be a multi-year effort to manage the burrowing rodent population and manage the impacts of burrows in the San Lorenzo River Levees. Burrowing rodents pose a threat to levee stability and management of the burrowing rodent population is needed to proceed with FEMA certification. The burrowing rodent management program will consist of identifying burrows, which may involve weed whipping for visibility by the contractor, mitigating active burrows and grouting existing burrows after mitigation. The selected contractor shall use an RC 206ES Rodent Control compressor or equivalent to mitigate burrows by fumigation. Fumigation shall be completed by a qualified contractor or sub-contractor with a valid California Structural Pest Control Board License and registered with the County of Santa Cruz Agricultural Department. The contractor will survey for and flag active burrows. Following the fumigation the burrows shall be filled with grout and meet the following requirements: 9 parts cement to 1 part bentonite mixed with water to achieve 8-10 inches slump. Low pressure injection of flowable grout with shutoff valve to avoid overfilling burrow hole. Backfill injected burrow hole with dirt. Use of sediment control BMPs to hold back spillage at the lowest elevation of the riverbank. Work areas will be cleaned and devoid of concrete debris Each mitigation effort will include a submittal detailing the total gallons of grout pumped into each zone (See attachment A) Location: Specified zones along the San Lorenzo River levees from Highway 1 bridge to the trestle bridge located by the Santa Cruz Boardwalk parking lot Water side: Upper 20 ft of the water side slope as measured from the edge of the paved levee path or to top of rip rap armoring (whichever is less) Land side: From edge of paved levee path to levee toe