PROJECT DESCRIPTION
The Project is being proposed to repair and replace the City’s water infrastructure facilities in the Upper Arroyo Seco that were damaged by debris flows caused by storms following the 2009 Station Fire. Disrepair and damage to these structures has greatly reduced the City’s capacity to divert water from the Arroyo Seco and spread it for groundwater recharge and pumping credits. The proposed improvements would allow for increased utilization of the City’s pre-1914 surface water rights from the Arroyo Seco and maximize the beneficial use of this important local water resource. The Project involves the construction of a new diversion weir and intake in the same location within the Arroyo Seco as the current facility (Area 2) which will span the width of the streambed and include an operable weir crest gate. In Area 3, the proposed Project includes the reconfiguration and expansion of the existing spreading basins in order to accommodate the increased diversion of stream flows for infiltration into the Raymond Groundwater Basin.
Upon completion of the proposed Project and into the foreseeable future, the City intends to keep the existing structural bridge overlay on top of Bridge No. 3 along the Gabrielino Trail (which connects Areas 2 and 3). Furthermore, the City may need to remove some or all of the historic bridge to protect public safety. During construction of the proposed Project, there may be times when portions of the Altadena Crest Trail, Gabrielino Trail/Access Road, Arroyo Seco Trail, and the unnamed trails/maintenance roads would be partially or fully closed to the public due to construction activities. Upon completion of the proposed Project, the temporarily disrupted trail network would be restored.
Long-term operations in Areas 2 and 3 would not be substantively different than the current conditions.
ENVIRONMENTAL REVIEW
Notice of Availability (June 2020)
DOCUMENTS AVAILABLE FOR REVIEW
00_Acronyms List
00_Table of Contents_rev
0_Executive Summary
1_Introduction
2_Environmental Setting_rev
3_Project Description_rev
4.0_Environmental Impact Analysis
4.1_Air Quality
4.2_Biological Resources_rev
4.3 Cultural Resources
4.4_Greenhouse Gas Emissions
4.5_Hydrology and Water Quality_rev
4.6_Noise
4.7_Recreation_rev
4.8_Transportation_rev
4.9_Tribal Cultural Resources
5_Mandatory CEQA Topics
6_Alternatives_rev
7_List of Preparers
App A-2_Initial Study Appendices, 2019
App A-3_NOP-Initial Study Comment Letters
App A-4_Final ASCP IS-MND, 2015
App B-1_Area 2 BOD Report, 2020
App B-2_ASCP Area 3 Plans, 2015
App C_CalEEMod Data
App D_Biological Resources Tech Report, 2020
App E-1_Cultural Resources Tech Report
App E-2_Paleontology Records, 2020
App F_Hydraulics, Sediment Transport, Groundwater Analysis, 2018
App G_Field Measurement Noise Data, 2019
App H_Transportation Data, 2020
App I-1_Tribal Cultural Resource_AB-52
CONTACT INFORMATION
CASE MANAGER: Elisa VenturaEMAIL: eventura@cityofpasadena.net