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4.I Water Resources

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The stored water could be extracted in dry years in amounts up to 4,950 afy. As of
December 31, 2007, there is 18,828 af of water stored in the Semitropic Groundwater Storage
Bank by The Newhall Land and Farming Company for the Newhall Ranch Specific
Plan. Newhall Ranch is located within the CLWA service area. Delivery of stored water
from the Newhall Land Semitropic Groundwater Bank requires further agreements between
CLWA and Newhall Land.

3. IMPACT ANALYSIS

The following discussion identifies anticipated impacts associated with the
implementation of the proposed project based on the thresholds of significance below. As
described above, imported water supplies from the Delta may or may not be affected by the
recent action related to the longfin smelt and the recent court decision related to the salmon and
steelhead BO described above. Given the lack of conclusion related to these actions and
resultant SWP and CVP operations as described above, the information presented in this section
and the analysis included here incorporates the best available information as provided by DWR
and CLWA, given it is not possible or required to speculate as to potential water supply impacts
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specifically related to these actions.

a. Thresholds of Significance

The proposed project would have a significant impact with respect to water supply if it
would:

• Have insufficient water supplies available to serve the project from existing and
planned entitlements such that new or expanded entitlements would be needed;

• Have insufficient water supply infrastructure available to serve the project such that
new or expanded infrastructure would be required; or

• Substantially deplete groundwater supplies or interfere substantially with
groundwater recharge such that there would be a net deficit in aquifer volume or a
lowering of the local groundwater table level (e.g., the production rate of pre-existing

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Los Angeles County, Additional CEQA Findings Regarding the Newhall Ranch Final Additional Analysis to the
Partially Certified Final EIR for the Newhall Ranch Specific Plan and Water Reclamation Plant, March 2003.
Retrieved from: http://planning.co.la.ca.us/doc/offDocs/drp_Newhall_Ranch.pdf.
81 CEQA Guidelines Sec. 15144, 15145.

County of Los Angeles Department of Regional Planning Skyline Ranch Project
PCR Services Corporation July 2009

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PRELIMINARY WORKING DRAFT – Work in Progress