Page 122 - Yucaipa Valley Water District
P. 122
Workshop Memorandum 17-079
Date: May 30, 2017
From: Jennifer Ares, Water Resource Manager
Subject: Review of a Proposal for the 2016-2017 Habitat Monitoring Program Activities,
Groundwater and Surface Water Data Assistance, and Annual Report
The Yucaipa Valley Water District began discharging to San Timoteo Creek in 1986 and currently
discharges tertiary treated recycled water to the stream system. The riparian vegetation along
San Timoteo Creek has been partially supported by the discharge of highly treated recycled water.
In order to maximize the reuse of recycled water, the District was granted a “change of point of
discharge” agreement from the State Water Resources Control Board permitting the reduction of
the discharge from San Timoteo Creek with definitive mitigation measures. Gradual reductions
of the discharge along with an adaptive management plan are required to ensure the vegetation
is not negatively impacted due to the reduction of recycled water flow. The table below represents
the minimum 7-day average discharge reductions over five years allowable under the WW-26
permit.
12-Month Period Following the Minimum 7-Day Average
Month Order was Approved Discharge for the 12-Month Period
First 1.9 mgd (2.9 cfs)
Second 1.0 mgd (1.6 cfs)
Third 0.5 mgd (0.8 cfs)
Fourth 0.2 mgd (0.3 cfs)
Fifth 0.1 mgd (0.2 cfs)
In accordance with the results of a water use report prepared by SWCA Environmental
Consultants in 2005, the District could reduce the discharge to maintain the existing habitat in
San Timoteo Creek. In order to validate the reduction in flow, an annual habitat monitoring
program has been in place and reports are prepared each year to determine the results of the
reduction in creek discharges. The District is currently in its fourth year of reporting the habitat
monitoring program activities.
The Habitat Monitoring Program for San Timoteo Creek defines the adaptive management plan
for San Timoteo Creek. Components of the monitoring plan consist of vegetation analysis, aerial
photo and groundwater monitoring. Costs associated with the Habitat Monitoring program are
listed below.
Yucaipa Valley Water District - May 30, 2017 - Page 122 of 138
