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Siskiyou County Flood Control and Water Conservation District GSA - Butte Valley - 1-004 SHASTA VALLEY

Siskiyou County Flood Control and Water Conservation District GSA - Butte Valley - 1-004 SHASTA VALLEY

A. Applicant Information

Requesting Agency Information
Agency Name: Siskiyou County Flood Control and Water Conservation District GSA - Butte Valley
Address: 1312 Fairlane Rd
City: Yreka Zip: 96097
Work Phone: (530) 842-8005 Cell Phone:
Email: mparker@co.siskiyou.ca.us Fax:
Revision Request Manager Information
Person Name: Matt Parker
Address: 1312 Fairlane
City: Yreka Zip: 96097
Work Phone: 530-842-8019 Cell Phone:
Email: mparker@co.siskiyou.ca.us Fax:
 

B. Description of Proposed Boundary Modification

  1. The GSA wishes to modify the current Shasta Basin Boundary
    • Scientific External
  3. The Siskiyou County Flood Control and Water Conservation District is applying for a scientific boundary modification to the Shasta Valley Subbasin (1-004) based on geologic and hydrologic conditions (§ 342.2). There is community support, hydrologic reports, geologic mapping, geologic reports, and technical documentation that supports the recognition of the strong hydrologic connection that exists between the groundwater basin (currently delineated only by Quaternary terrace deposits and alluvium) and the volcanic and mostly volcanogenic sedimentary rocks that occupy the Shasta Valley. This modification request recognizes that the Shasta Valley groundwater basin meets the criteria to be classified as an intermontane basin-fill aquifer (USGS, 1975) and as a single complex basin (DWR, 2003), because it is composed of alluvial and unconsolidated sedimentary deposits underlain and interbedded with fractured and jointed volcanic rocks and basalt flows that receive, transmit, store, and produce water for both groundwater extraction and streams. The current boundary as defined under Bulletin 118 (2003) does not adequately address the hydrology of the Shasta Valley groundwater basin and modifying to the proposed boundary will allow the GSA to develop and implement a more substantive, accurate and sustainable GSP for all of its watershed stakeholders. The proposed boundary line follows geologic contacts and hydrologic features that define the aquifers that make up the basin. The proposed basin encompasses the majority of Shasta Valley?s groundwater use, groundwater recharge through flood irrigation, interconnected stream reaches, and key hydrogeologic units therefore better representing the aquifers that comprise the basin and promoting Sustainable Groundwater Management. The implementation of Sustainable Groundwater Management in Shasta Valley groundwater basin can only occur if the basin?s boundaries include the hydrogeologic units that comprise the basin; strictly defining the basin by the surficial extent of alluvium the majority of the basin?s land and water use. The short segments of the proposed basin boundary that follow the NHD HUC8 Shasta watershed boundary are used to ensure that the basin?s boundaries are both practicable and practical for the GSA and beneficial users. The basin linework and the hydrogeologic conceptual model of the initial modification request submittal have been revised to better reflect the intent of the initial submittal, and the revisions to the linework are considered non-material changes.
    • 1-004 SHASTA VALLEY
  5. No Change

C. Initial Notification and Combination of Requests

  1. Yes
    Local Agency Potential Basin(s)/Subbasin(s)
    1-004 SHASTA VALLEY
  2. No

D. Required Documents for All Modifications

This boundary modification is not considered a project therefore CEQA is not needed.

E. General Information

1) Beginning in the Northern portion of the proposed basin (-122.5073, 41.805 decimal degrees) and moving in a clockwise direction, the basin boundary follows the NHD HUC 8 Watershed boundary for Shasta Valley (excluding any outcroppings of Kh - Hornbrook formation) to the intersection with the High Cascade Volcanics (Qv) (-122.2621 ,41.7984 decimal degrees); 2) The boundary then follows the contact between the Western Cascade Volcanics (Tv), and the High Cascade Volcanics (Qv, Pv) to the intersection with the Yellow Butte Fault at point (-122.3173, 41.6514 decimal degrees); 3) The boundary continues along the Yellow Butte Fault (excluding outcrops of Kh - Hornbrook Formation), to its intersection with the older Mesozoic and Paleozoic rocks (Mzg, SOd) to point (-122.2577, 41.5511 decimal degrees); 4) At point (-122.2850446, 41.5490124) the boundary follows topographic and geological features around a cinder cone; 5) The basin boundary then follows the contact of the Plutos Cave Basalt (Qvb) with the older Mesozoic and Paleozoic rocks (Mzg, SOd) and the other members of the High Cascade Volcanics (Qv), to the contact with the glacial deposits (Qg) at point (-122.2927, 41.5473 decimal degrees). 6) The basin boundary continues along the contact of the glacial deposits (Qg) and Volcanic rocks of Shasta Valley (Qvs), with the High Cascade Volcanics (Qv) to point (-122.3806, 41.4425 decimal degrees); 7) The basin boundary continues to follow the contact between the Volcanic Rocks of Shasta Valley (Qvs), and the High Cascade Volcanics (Qv) to the intersection of the southern part of the NHD HUC 8 Watershed boundary for Shasta Valley at point (-122.3919, 41.3751 decimal degrees); 8) The boundary then follows the NHD HUC 8 Watershed boundary for Shasta Valley to the intersection of the geologic contact of glacial deposits (Qg) at point (-122.4155, 41.3577 decimal degrees); 9) The boundary then follows the geologic contact of glacial deposits (Qt) and the Volcanic Rocks of Shasta Valley (Qvs), continuing on contact with the older Mesozoic and Paleozoic rocks (Eastern Klamath Belt, Central Metamorphic Belt, Western Paleozoic and Triassic Belt, and Hornbrook Formation), Quaternary alluvium (Q), Quaternary terrace deposits (Qt), Quaternary landslide deposits (Qls) and mine tailings (t), ending back at point 1 (-122.5073, 41.805 decimal degrees).

F. Notice and Consultation

In Current Basin: Montague Water Conservation District City of Montague City of Grenada (Grenada Sanitary District) Grenada Irrigation District City of Yreka Shasta River Water Users Association Karuk Tribal Housing Authority In Proposed Basin: Lake Shastina Community Services District (Lake Shastina Mutual Water Company) Big Springs Irrigation District Town of Edgewood Town of Gazelle
Siskiyou County natural resources staff retains an email outreach list of SGMA interested parties. Email updates are regularly sent regarding all SGMA and GSP related activities. County staff reached out to all Shasta Valley irrigation districts, public water agencies, and other groundwater users in the current and potential new basin, to gather information and feedback regarding the Flood Control District potentially applying to modify the current Shasta basin boundary line. Staff attended meetings, met with stakeholder groups, exchanged emails, and held phone conversations to gauge the interest and reaction from the community regarding the boundary line potentially moving to include themselves, their entity, or neighboring entities. County staff held two rounds of public workshops in March and May, to present related material to the community, and the Flood Control District held a public hearing in June.
Natural Resource staff attended meetings with irrigation districts, non-profit interest groups, tribal entities, and community members to discuss modifying the Shasta basin boundary line. Those include: 11/28/17 Attended Shasta Watershed Conservation Group meeting 11/29/17 Attended Montague Water Conservation District meeting - Attended Scott & Shasta Watermaster District meeting 12/4/17 Attended Big Springs Irrigation District meeting 12/5/17 Attended Shasta River Water Users Association meeting 12/14/17 Attended Siskiyou County Farm Bureau meeting 2/5/18 Discussion item during natural resources meeting with Karuk Tribe - Attended Big Springs Irrigation District meeting 2/9/18 Discussion item during meeting with Shasta Indian Nation 2/14/18 Attended Montague Water Conservation District meeting 2/19/18 Attended Grenada Irrigation District meeting 3/9/18 Attended Shasta Watershed Conservation Group meeting 3/28/18 Attended Lake Shastina Community District board meeting 4/6/18 Meeting with individual water users and community members
2/28/18 Email notice of Stakeholder workshops (Montague & Gazelle) 2/28/18 Email SGAC meeting agenda 3/5/18 Shasta Groundwater Advisory Committee meeting 3/9/18 Email notice of Stakeholder workshops (Montague & Gazelle) 3/13/18 Outreach workshop in Montague 3/14/18 Outreach workshop in Gazelle 4/13/18 Email update with staff report reminder for 4/17 Flood Control meeting 4/17/18 Flood Control District meeting staff report 5/21/18 Email notice of Stakeholder workshop (Montague) 5/30/18 Email notice of Stakeholder workshop (Montague) 5/31/18 Outreach workshop in Montague 6/4/18 Email meeting notice for Shasta Groundwater Advisory Committee special meeting 6/8/18 Shasta Groundwater Advisory Committee Special meeting 6/12/18 Flood Control District Public Hearing 6/15/18 Email outreach email update

H. Local Support

All requests for boundary modification must include the following:
2/28/18 Email notice of Stakeholder workshops (Montague & Gazelle) 2/28/18 Email SGAC meeting agenda 3/5/18 Shasta Groundwater Advisory Committee meeting 3/9/18 Email notice of Stakeholder workshops (Montague & Gazelle) 3/13/18 Outreach workshop in Montague 3/14/18 Outreach workshop in Gazelle 4/13/18 Email update with staff report reminder for 4/17 Flood Control meeting 4/17/18 Flood Control District meeting staff report 5/21/18 Email notice of Stakeholder workshop (Montague) 5/30/18 Email notice of Stakeholder workshop (Montague) 5/31/18 Outreach workshop in Montague 6/4/18 Email meeting notice for Shasta Groundwater Advisory Committee special meeting 6/8/18 Shasta Groundwater Advisory Committee Special meeting 6/12/18 Flood Control District Public Hearing 6/15/18 Email outreach email update
The District has not received opposition to this proposed boundary modification.

I. Hydrogeologic Conceptual Model

Requests for boundary modification, must include a document or text to a clearly defined hydrogeologic conceptual model demonstrating each of the following:

J. Technical Studies for External Scientific Modifications

Requests for a scientific modification must include a document containing information that demonstrates the extent of the aquifer. Provide the following:
Created on 06/20/2018 at 8:53AM, last modified on 12/14/2023 at 1:33PM and page generated on 05/05/2024 at 8:56AM