B. Description of Proposed Boundary Modification

1. Short Description

   This proposed Basin Boundary Modification Request for the Warren Valley Groundwater Basin 7-12 is to bring the eastern basin boundary into alignment with the written description of the Warren Valley Basin provided in Bulletin 118 (Update 2003).
2. Type of basin boundary revision

   • Scientific Internal
3. Provide a narrative overview of the boundary modification request and how the resulting modification would affect likelihood of sustainable management.

   23 CCR §340.4 States that a "clear and unambiguous written description of a basin or subbasin boundary in Bulletin 118 shall prevail over any inconsistent basin or subbasin boundary as depicted on a map, in an electronic data file, or otherwise, except when modified pursuant to these regulations." The purpose of this proposed Basin Boundary Modification Request for the Warren Valley Groundwater Basin 7-12 (Warren Valley Basin) is to bring the eastern basin boundary into alignment with the written description of the Warren Valley Basin provided in Bulletin 118 (Update 2003). An apparent discrepancy exists between the area of the Warren Valley Basin listed in Bulletin 118 (Update 2003) as 17,200 acres or 26.9 square miles and the area of the Warren Valley Basin listed as 23,952 acres or 37.4 square miles in datasets available on DWR's CASGEM website (http://www.water.ca.gov/groundwater/casgem/basin_prioritization.cfm). Bulletin 118 (Update 2003) identifies the "Yucca barrier" of Lewis (1972) as the eastern boundary of the Warren Valley Basin. Subsequent studies by the USGS (Nishikawa et al., 2003 and 2004) document hydrogeologic and water level data that support the presence of the Yucca barrier. Mojave Water Agency staff obtained a copy of Lewis (1972), USGS Open-File Report 72-234 (https://pubs.er.usgs.gov/publication/ofr72234), then georeferenced and digitized the "Yucca barrier" into a shapefile, which was overlain onto the Final 2016 Bulletin 118 Groundwater Basin Boundaries available on DWR's Basin Boundary Modifications webpage (http://www.water.ca.gov/groundwater/sgm/basin_boundaries.cfm). The location of the eastern boundary of Warren Valley Basin in the Final 2016 Bulletin 118 Groundwater Basin Boundaries shapefile is inconsistent with the "Yucca barrier" of Lewis (1972) as shown on the attached figure. This proposed Internal Scientific Basin Boundary Modification is an administrative adjustment to bring the graphically drawn basin boundary into alignment with the written description of Warren Valley Basin provided in Bulletin 118 (Update 2003) as required by 23 CCR §340.4. This correction would also bring the western boundary of the Joshua Tree Groundwater Basin 7-62 (Joshua Tree Basin) into alignment with the ?Yucca barrier? of Lewis (1972) as described in the written description of the Joshua Tree Basin provided in Bulletin 118 (Update 2003). This correction would resolve an apparent discrepancy between the area of the Joshua Tree Basin listed in Bulletin 118 (Update 2003) as 33,800 acres or 53.8 square miles and the basin area listed in datasets available on DWR?s CASGEM website (http://www.water.ca.gov/groundwater/casgem/basin_prioritization.cfm) as 27,422 acres or 42.8 square miles.

   Attachment(s):
4. List the existing basin(s)/subbasin(s) to be modified by this request

   • 7-012 WARREN VALLEY
   • 7-062 JOSHUA TREE
5. Provide the proposed name for the new basin(s) or subbasin(s)

C. Initial Notification and Combination of Requests

1. Was an initial notification submitted to the Department?

   Yes
   List of submitted initial notification for the selected basin(s)/subbasin(s).

   Local Agency	Potential Basin(s)/Subbasin(s)
   Mojave Water Agency	7-012 WARREN VALLEY

2. Does this application include a combination of requests?

   No

D. Required Documents for All Modifications

1. A copy of the statutory or other legal authority under which the requesting agency was created with specific citations to the provisions setting forth the duties and responsibilities of the agency.

Attachment(s):

• Mojave Water Agency Law.pdf (27.9MB) Uploaded on 06/26/2018 at 09:22AM
• Mojave Water Agency Law - specific citations.pdf (87.4kB) Uploaded on 06/26/2018 at 09:54AM

2. A copy of the signed resolution adopted by the requesting agency formally initiating the boundary modification request process.

Attachment(s):

• MWA Resolution 1042-17.pdf (84.7kB) Uploaded on 06/26/2018 at 09:25AM

3. A map of adequate scale (no greater than 1:24,000; e.g., 1:10,000 is not acceptable) showing the proposed modified basin boundary in relation to the existing Bulletin-118 basin boundary and the local agencies that are within or bordering the existing and proposed basin.

Attachment(s):

• Proposed BBMR Figure.pdf (815.2kB) Uploaded on 07/17/2018 at 04:51PM

4. A GIS shapefile of the proposed modified groundwater basin boundaries. Download Existing B118 basin shape file | DWR Spatial Data Standards

Attachment(s):

• Proposed_BBMR_07192018.zip (57.2kB) Uploaded on 07/19/2018 at 04:09PM

5. A GIS shapefile of the political boundaries of any affected or adjacent local agency. Download water agency shape file

Attachment(s):

• All Boundaries.zip (35.2kB) Uploaded on 07/17/2018 at 11:36AM

6. Any information, if necessary, to enable DWR to satisfy the requirements of a responsible agency pursuant to the California Environmental Quality Act.

This is not a project under CEQA.

E. General Information

1. Describe the lateral boundaries of the alluvial aquifer or aquifers that form the groundwater basin and the definable bottom of the basin. The description must be in terms that are clear, definite, and sufficiently detailed to allow an authoritative map of the proposed basin boundaries to be plotted using the given description.

Attachment(s):

• 7-12 Warren Valley Basin Bulletin 118.pdf (30.5kB) Uploaded on 06/26/2018 at 10:13AM
• 7-62 Joshua Tree Basin Bulletin 118.pdf (30.5kB) Uploaded on 07/17/2018 at 11:36AM

F. Notice and Consultation

1. List all local agencies and public water systems affected by the basin(s) modification request.

Joshua Basin Water District (JBWD), Hi-Desert Water District (HDWD), Warren Valley Basin Watermaster, Twentynine Palms Water District (TPWD), and Mojave Water Agency (MWA)

2. Explain the methods used to identify interested local agencies and public water systems in the affected basin(s):

Meetings and communications with staff from JBWD, HDWD, MWA, DWR, and SWRCB in addition to GIS evaluation of the area.

3. Provide information regarding the nature of consultations with affected or interested agencies. Attach and cite any copies of correspondences with local agencies and public water systems and/or any other persons or entities consulted.

Attachment(s):

• F. Notice and Consultaion - collaboration with local agencies.pdf (77kB) Uploaded on 07/17/2018 at 11:50AM

4. Provide a summary of all public meetings at which the proposed boundary modification was discussed or considered by the requesting agency. Attach and cite any copies of agendas and notices published.

Attachment(s):

• F. Notice and Consultation - public meetings.pdf (85.1kB) Uploaded on 06/26/2018 at 10:39AM

5. Attach a copy of all comments regarding the proposed boundary modification received by the requesting agency and a summary of any responses made by the requesting agency.

None

H. Local Support

1. Provide any evidence that sufficient information was provided to affected agencies and systems regarding the proposed boundary modification.

Letter of Support from JBWD Letter of Support and Resolution of Support from HDWD

Attachment(s):

• 2018-05-10 JBWD Letter of Support.pdf (29.5kB) Uploaded on 06/26/2018 at 09:40AM
• 2018-06-13 HDWD Letter of Support.pdf (274.9kB) Uploaded on 06/26/2018 at 09:41AM
• HDWD Resolution 18-10.pdf (673.2kB) Uploaded on 06/26/2018 at 09:41AM

2. Provide a list of all affected agencies and affected systems that submitted comments and/or documents in support or opposition to the proposed boundary. The agency submitting their support or opposition for a boundary modification must provide a copy of a resolution formally adopted by the decision-making body of the affected agency or system or a letter signed by an executive officer or other official with appropriate delegated authority who represents the agency or system. Attach copies of the resolution and/or signed letter detailing the support or opposition submitted.

Letter of Support from JBWD Letter of Support and Resolution of Support from HDWD

Attachment(s):

• 2018-05-10 JBWD Letter of Support.pdf (29.5kB) Uploaded on 07/05/2018 at 09:08AM
• 2018-06-13 HDWD Letter of Support.pdf (274.9kB) Uploaded on 07/05/2018 at 09:09AM
• HDWD Resolution 18-10.pdf (673.2kB) Uploaded on 07/05/2018 at 09:09AM

3. Provide any evidence that rebuts any opposition to the proposed boundary modification.

Not applicable

I. Hydrogeologic Conceptual Model

1. Principal aquifer units within requested basin.
2. Lateral boundaries of the proposed basin, including:
   1. Geologic features that significantly impede or impact groundwater flow.
   2. Aquifer characteristics that significantly impede or impact groundwater flow.
   3. Significant geologic and hydrologic features and conditions of the principle aquifer units, as appropriate, including information regarding the confined or unconfined nature of the aquifer, facies changes, truncation of units, the presence of faults or folds that impede groundwater flow, or other groundwater flow restricting features.
   4. Key surface water bodies, groundwater divides and significant recharge sources.
3. Recharge and discharge areas within the basin.
4. Definable bottom of the basin or subbasin.

The department may waive this requirement for an internal boundary modification if the requesting agency is able to demonstrate that the proposed boundary modification is unlikely to affect sustainable groundwater management.

Attachment(s):

• 7-62 Joshua Tree Basin Bulletin 118.pdf (30.5kB) Uploaded on 07/17/2018 at 11:25AM
• 7-12 Warren Valley Basin Bulletin 118.pdf (30.5kB) Uploaded on 06/26/2018 at 10:12AM

K. Technical Studies for Internal Scientific Modifications

1. A qualified map depicting structural geologic features that could significant impact or impede lateral groundwater flow.

Attachment(s):

• Yucca barrier with Draft 2018 SGMA Basin Prioritization.pdf (901.3kB) Uploaded on 07/17/2018 at 11:27AM

2. Geologic and hydrologic evidence of groundwater conditions by attaching or providing a URL to any of the following:
   1. Historical and current potentiometric surface maps, groundwater levels, groundwater recharge and discharge areas of the aquifer system within the vicinity of the proposed boundary modification.
   2. Aquifer performance testing results demonstrating basin boundary condition response.
   3. Water quality information of the aquifer system including but not limited to general water quality parameters and isotopic analysis.
   4. Supporting certified geophysical studies.
   5. Any other pertinent information.

Lewis, R.E. 1972. Ground-Water Resources of the Yucca Valley-Joshua Tree Area, San Bernardino County, California. U.S. Geological Survey Open-File Report. 51 p. https://pubs.er.usgs.gov/publication/ofr72234

Attachment(s):

• Lewis 1972 from USGS website.pdf (1.3MB) Uploaded on 06/26/2018 at 10:08AM