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Name:	Mojave Water Agency
Address:	13846 Conference Center Drive
City:	Apple Valley	Zip:	92307
Phone(Work):	(760) 946-7063	Phone(Cell):
Email:	agarcia@mojavewater.org	Fax:	(760) 240-2642

Name:	Anna Garcia
Address:	13846 Conference Center Drive
City:	Apple Valley	Zip:	92307
Phone(Work):	760-946-7063	Phone(Cell):
Email:	agarcia@mojavewater.org

General information regarding potential basin boundary modification process is posted or will be posted.

• http://www.mojavewater.org/basinmodification.html

• 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 resolve an apparent discrepancy between the area of the Joshua Tree Groundwater Basin 7-62 (Joshua Tree Basin) listed in Bulletin 118 (Update 2003) as 33,800 acres or 53.8 square miles and 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. Which would indicate that the area beyond the properly described and delineated Warren Valley Basin (7-12) is part of the Joshua Tree Basin (7-62) and should have been designated very low priority.

• 7-012 WARREN VALLEY

Uploaded document: Figure - Warren Valley Basin.pdf