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Name:	Corona City Of
Address:	Department of Water and Power, 755 Public Safety Way
City:	Corona	Zip:	92880
Phone(Work):	(951) 279-3660	Phone(Cell):	(951) 830-2319
Email:	tom.moody@ci.corona.ca.us	Fax:

Name:	Tom Moody
Address:	755 Public Safety Way
City:	Corona	Zip:	92882
Phone(Work):	951-736-2234	Phone(Cell):
Email:	tom.moody@ci.corona.ca.us

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

• http://discovercoronadwp.com/02-2016-BasinModificationInfo.shtml

• The northwestern portion of the current Elsinore Basin from which the City of Corona (City) pumps groundwater is within the Temescal Wash watershed, and is locally referred to as the Bedford-Coldwater area. The City is coordinating with the Temescal Valley Water District (TVWD) (formerly Lee Lake Water District) and the Elsinore Valley Municipal Water District (EVMWD) to explore a basin boundary modification request from DWR to create a new groundwater basin covering the Bedford-Coldwater area. This boundary modification request would also include realignment of the existing Elsinore Basin boundaries to match the alluvium of the Elsinore Valley and Temescal Wash areas, as mapped by the USGS. The City, TVWD, and EVWMD are submitting a combined request for boundary modifications, as required by DWR. The basin boundary modification request will document the benefits and need for the Elsinore Basin boundary modifications and creation of the new Bedford-Coldwater Basin. The Elsinore Basin and proposed new Bedford-Coldwater Basin boundaries would be modified to align with the alluvial deposits as mapped by the USGS, resulting in better correlation between the description in DWR Bulletin 118 and the mapped basins. Groundwater within the Bedford-Coldwater area is hydraulically connected to the remainder of the Elsinore Basin primarily beneath a narrow channel of the Temescal Wash, and to a limited extent through shallow upland alluvial material. This limited connection provides a natural break for a basin boundary in a location that general separates two regional groundwater flow regimes. Groundwater flow north of this boundary is primarily towards the northwest and the center of the proposed basin. Although some groundwater inflow to the proposed basin is from the south, most of the groundwater in the rest of the Elsinore Basin flows southeast toward the basin center. The canyon contains shallow bedrock and thin alluvial sediments, which restrict the volume of subsurface inflow across the boundary. Recharge within the Bedford-Coldwater area primarily occurs from runoff in adjacent hills east and west of the area rather than from the small amounts of inflow from the south. The Elsinore Basin south of the Bedford-Coldwater area is within the service area of the EVMWD, but the Bedford-Coldwater area is outside of EVMWD. The City and TVWD service areas cover almost all of the Bedford-Coldwater area; those portions outside of these service areas are not within the service area of any local water agency. The agencies will coordinate with Riverside County for these currently unmanaged areas as required under the Sustainable Groundwater Management Act of 2014 (SGMA). Corona, in coordination with EVMWD and TVWD, has long been responsible for managing groundwater conditions in the Bedford-Coldwater area. For example, the City has executed legal agreements with EVMWD for the managed withdrawals from the Coldwater area. Creation of this new basin would allow the City to continue to coordinate with the other agencies overlying the Bedford-Coldwater area separate from activities in the Elsinore Basin. This arrangement would facilitate activities for sustainable management of the groundwater within the Bedford-Coldwater area. Recognizing the hydrogeologic and jurisdictional conditions in the Bedford-Coldwater area that are distinct from the remainder of the Elsinore Basin, Corona, TVWD, and EVMWD believe that more effective sustainable groundwater management will be achieved if Bedford-Coldwater is a separate groundwater basin. The modified basin boundaries of the new Bedford-Coldwater Basin and the re-aligned Elsinore Basin will be more consistent with both the hydrogeologic conceptual model and historical and ongoing management of these shared groundwater resources. A map that shows the current and proposed basin boundaries can be accessed below.

• 8-004 ELSINORE

Uploaded document: Elsinore Basin Boundary Modification Map 2-11-16.pdf