Fish & Wildlife 5 (San Diego)
(California Department of Fish and Wildlife, Region 5)
Freeman Diversion Routine Maintenance
NOE - Notice of Exemption
CDFW is proposing to execute a Lake and Streambed Alteration Agreement No. 1600-2013-0223-R5. The Applicant proposes to conduct maintenance activities at the Freeman Diversion facility, located on the Santa Clara River. Project activities include: Vegetation control at the Roller Compacted Concrete Dam (RCCD) along the slopes of the dam and within a 5-foot wide zone on the upstream and downstream side of the dam. In the event that clearance takes place within the maximum width (15 feet), the total disturbance area would be 30 feet (15 feet on either side of the dam) by 1,175 feet, which would result in an impact area totaling 0.80 acres; Vegetation control along riprap and access areas consists of the removal and prevention of vegetation growth within access areas and riprap structures of the facility. Vegetation control will be conducted within a 15-foot wide zone along the toe of all rip rap structures within the facility. In the even that vegetation clearance occurs within the maximum width (15 feet from toe of riprap slopes), the total disturbance area would be 15 feet by 5,185 feet, which would result in an impact area totaling 1.79 acres. This 1.79 acre area of vegetation disturbance has been subject to this same maintenance regime for many years; establishment of a low-flow channel requires the creation, or excavation, of a low-flow channel that will connect the downstream entrance of the fish ladder to the thalweg (active channel area) of the Santa Clara River and will require bulldozing a channel to remove built up sediment. The maximum distance is estimated not to exceed 300 feet in length and the average width of this channel will be 15 feet; repair of existing structures includes the in-kind repair fo riprap bank stabilization structures and access areas; and de-watering of the settling basin. There are occasions when it is necessary to lower the water level in the basin to perform maintenance and/or repairs to associated infrastructure and to remove accumulated sediment from the basin. A gate is located in the desilting basin that allows for water to be released from the desilting into the south side of the Santa Clara River.