Newell Creek Dam InletOutlet Replacement Project Public Information

Newell Creek Dam Inlet/Outlet Replacement Project Public Information Meeting for the Draft Environmental Impact Report City of Santa Cruz Water Department December 11 & 13, 2018

Presentation - What We Will Cover • Project Overview • Environmental Review Process • Findings of the Draft EIR • How to Participate Slide 2 of 30

Project Overview Slide 3 of 30

City’s Major Water Supply Facilities Newell Creek Pipeline • Loch Lomond • Graham Hill Water Treatment Plant • Raw Water Conveyance • Newell Creek Pipeline • North Coast Pipeline • San Lorenzo River • Felton Diversion • Tait St. Wells • North Coast Intakes • Liddell Spring • Laguna Creek • Majors Creek • Beltz Wells & Treatment Plants Slide 4 of 30

Project Location The Project will be at Loch Lomond Reservoir about 10 miles north of Santa Cruz and 2 miles east of Ben Lomond in the Santa Cruz Mountains Slide 5 of 30

Newell Creek Dam • Newell Creek Dam (NCD) is an earthen fill dam constructed in the 1960 s • NCD forms the Loch Lomond Reservoir • Loch Lomond Reservoir is the primary water storage facility for the City of Santa Cruz Water Department’s supply system Slide 5 of 30

Newell Creek Dam Inlet/Outlet Works The NCD Inlet/Outlet Works is the pipeline and controls used to operate the Reservoir to: • Convey water from the Reservoir to the Newell Creek Pipeline for transport to the City’s Graham Hill Water Treatment Plant • Deliver San Lorenzo River water diversions from the Newell Creek Pipeline into the Reservoir • Provide beneficial water releases to downstream Newell Creek • Implement operational and emergency flow releases from the Reservoir Slide 7 of 30

Newell Creek Dam Inlet/Outlet Works The Existing NCD Inlet/Outlet Works are approaching the end of their useful design life: • The inlet/outlet pipeline has deteriorated due to age and cannot be rehabilitated • The deepest of five existing intakes in the reservoir has been covered in sediment and sealed • An inoperable 24 inch plug valve at the toe of the dam limits the volume of flow releases Slide 8 of 30

Project Objectives • To protect the City’s water supply system by addressing deficiencies in the NCD inlet/outlet works to maintain full system functionality and reliability • Address deficiencies in the NCD inlet/outlet works to meet DSOD requirements to lower the maximum reservoir storage within required timeframes • Improve overall operational efficiency and system performance of the NCD inlet/outlet works Slide 9 of 30

Project Objectives • Improve access and ability to inspect and maintain the inlet/outlet system • Implement an inlet/outlet replacement project that is costeffective • Complete the first segment replacing the existing aging Newell Creek Pipeline to prevent damage to the pipeline during construction Slide 10 of 30

Project Components • A new inlet/outlet structure with three new intakes and air vent in the Reservoir • A new fourteen-foot diameter tunnel through the west dam abutment containing inlet/outlet pipelines • A new outlet structure and valves at the toe of the dam Slide 11 of 30

Project Components • A new inlet/outlet structure with three new inlets and air vent in the Reservoir • A new fourteen-foot diameter tunnel through the west dam abutment containing inlet/outlet pipelines • A new outlet structure and valves at the toe of the dam Slide 12 of 30

Project Components • A new inlet/outlet structure with three new intakes and air vent in the Reservoir • A new fourteen-foot diameter tunnel through the west dam abutment containing inlet/outlet pipelines • A new outlet structure and valves at the toe of the dam Slide 13 of 30

Project Components • A new control house on the dam • Replacement of a section of Newell Creek Pipeline below the outlet structure • Road and site improvements for construction access • Decommission of existing inlet/outlet works Slide 14 of 30

Project Components • A new control house on the dam • Replacement of a section of Newell Creek Pipeline below the outlet structure • Road and site improvements for construction access • Decommission of existing inlet/outlet works Slide 15115 of 30

Project Components • A new control house on the dam • Replacement of a section of Newell Creek Pipeline below the outlet structure • Road and site improvements for construction access • Decommission of existing inlet/outlet works Slide 1616 of 30

Project Components • A new control house on the dam • Replacement of a section of Newell Creek Pipeline below the outlet structure • Road and site improvements for construction access • Decommission of existing inlet/outlet works Slide 1717 of 30

Project Schedule Construction duration would be expected to be approximately 2 years, beginning mid 2020 and finishing mid 2022 • Year 1 Proposed Sequencing • Equipment mobilization and staging areas development • Newell Creek Pipeline replacement segment installation • Spillway plunge pool culvert bridge installation • Access road and area improvements, including construction platform • Temporary boat launch and silt curtains installation • Intake structure construction from barge in reservoir • Tunnel portal construction and start of tunnel excavation Slide 1818 of 30

Project Schedule Construction duration would be expected to be approximately 2 years, beginning mid 2020 and finishing mid 2022 • Year 2 Proposed Sequencing • Continuing tunnel excavation • Inlet/outlet conduit installation in tunnel, connection of intake structure to the conduit, and tunnel backfilling • Control house construction on dam crest • New outlet structure construction and connections • New system testing and existing system decommissioning Slide 1919 of 30

Environmental Review Process Slide 20 of 30

CEQA & the EIR Schedule Slide 21 of 16

Findings of the Draft EIR Slide 20 of 30

Significant Environmental Impacts No unavoidable significant environmental impacts were identified in the Draft EIR Slide 23 of 30

Mitigated Environmental Impacts The Draft EIR identified potentially significant impacts that can be mitigated to less than significant with mitigation: • Biological Resources • Special status species, sensitive habitat, aquatic resources • Nesting birds, in-reservoir fish • Cultural Resources • Paleontological resources Slide 24 of 30

Mitigated Environmental Impacts The Draft EIR identified potentially significant impacts that can be mitigated to less than significant with mitigation: • Forestry Resources • Loss or conversion of forest land to non-forest use • Hazards and Hazardous Materials • Disposal of hazardous waste • Upset or release of hazardous materials • Hydrology and Water Quality • Water quality impacts during construction Slide 25 of 30

Less-than-significant Impacts The Draft EIR identified less than significant impacts: • Air Quality • Criteria pollutants and greenhouse gas emissions • Odors • Cultural Resources • Archaeological, historical, and tribal cultural resources • Geology and Soils • Seismic hazards, slope stability, expansive soils Slide 26 of 30

Less-than-significant Impacts The Draft EIR identified less than significant impacts: • Hazards and Hazardous Materials • Use/transport of hazardous materials • Hydrology and Water Quality • Stormwater drainage and flood hazards • Noise • Permanent and construction noise increases • Traffic • Construction related traffic Slide 27 of 30

How to Participate Slide 26 of 30

Public’s Role A Notice of Availability (NOA) has been released to announce that a Draft EIR has been prepared and is available for public review. After reviewing the Draft EIR, we invite your comments in writing. Comments are most helpful when they focus on: • Sufficiency of the document in identifying and analyzing impacts • Ways in which significant impacts might be avoided • Additional specific mitigation measures or alternatives Slide 29 of 30

Comment Information Copies of the NOA and Comment Cards are available at this meeting The Draft EIR is available at the Downtown Santa Cruz and Felton Libraries, and at the Water Department Engineering Counter, and on the City’s website: All comments on the Draft EIR are due in writing by 5: 00 p. m. on December 21 Sarah Easley Perez, Associate Planner City of Santa Cruz Water Department 212 Locust Street, Suite C Santa Cruz, CA 95060 seasleyperez@cityofsantacruz. com http: //www. cityofsantacruz. c om/government/citydepartments/water/onlinereports/environmentaldocuments Slide 30 of 30