4.0 CUMULATIVE IMPACTS - Sacramento District - U.S. Army

4.0 Cumulative Impacts
site receptors would be significant even after mitigation.
Cumulative impacts from construction noise would be less than significant and
stationary noise sources would have no cumulative impact.
4.3.8 Utilities and Service Systems
Identification of Direct and Indirect Impacts of the Proposed Action
For reasons presented in Section 3.15, Utilities and Service Systems, the effects of the Proposed Action
on surface and groundwater supplies would not be substantial. However, because substantial new
development is planned for western Placer County at this time, the Proposed Action’s impact on water
supply has the potential to cumulate with the impact from other development and is therefore evaluated
below.
As described in Section 3.15, under Impact UTIL-4, the Proposed Action by itself would not require the
expansion of the Pleasant Grove Wastewater Treatment Plant (WWTP) as adequate capacity exists at this
time to treat the flows that would be generated at buildout of the Proposed Action. However, the
Proposed Action would be developed incrementally over time and some of the excess capacity available
at this time may not be available for the Proposed Action. Therefore, Impact UTIL-4 analyzes the
combined effect of the Proposed Action and other reasonably foreseeable projects in the area on WWTP
capacity. That analysis is therefore an assessment of the cumulative impact of the Proposed Action in
conjunction with the impacts of other future development. Similarly, Impact UTIL-5 presents the impact
of the Proposed Action in conjunction with the impacts of other reasonably foreseeable future
development on solid waste handling and disposal facilities, and also represents a cumulative analysis.
As they are adequately addressed in Section 3.15, these issues are not analyzed further below.
Current Status of the Resource
Water supplied to the Proposed Action would be from the American River, which supplies water to the
Central Valley Project (CVP) and State Water Project (SWP) storage reservoirs that in turn respond to
water demands imposed by their contracts and other non-project agricultural, municipal, and industrial
demands. Within the City of Roseville’s service area, most water supplies are for residential, commercial,
and industrial users. The City of Roseville’s water demand in 2008 was 36,559 afy (4,509 hectare-meters
per year). Within Placer County Water Agency’s service area, the majority of treated water is delivered to
residential and commercial users. The total demand for treated water was 35,573 acre-feet (4,587 hectaremeters)
in 2004 (Placer County Water Agency 2005).
Impact Sciences, Inc. 4.0-39 Sierra Vista Specific Plan Draft EIS
USACE #200601050 July 2012