Page 11 - Yucaipa Sustainable Groundwater Management Agency - Yucaipa SGMA

7 | Groundwater Sustainability Plan for the Yucaipa Basin Area | San Bernardino Valley Municipal Water District

TAC Meetings Deliverables: TM that will become
• Actions to Achieve Sustainability – Project brainstorm of the “Projects and Management
existing and planned management and new actions to achieve Actions to Achieve Sustainability
sustainability Goal” chapter of the Yucaipa GSP.
• Actions to Achieve Sustainability – Review results of project
ranking system and develop groundwater model scenarios to
evaluate project and management actions

TASK 8.0 INFILTRATION TESTING

Considerable work has been conducted by basin stakeholders to assess the potential to recharge the
groundwater in the Yucaipa basin. The most recent activity includes conducting pilot infiltration testing
at 13 sites across the valley, and the regional infiltration study is currently underway. Our team will
incorporate the results of the infiltration study into the USGS model which will then be used to assess
future management activities, including groundwater recharge from stormwater, imported water, or
from recycled water, and to evaluate the impacts of groundwater recharge projects on sustainability
goals. Our team will summarize the infiltration test results and the implications of those results on future
projects and sustainable management.

Deliverables: TM that will become the “Summary of Infiltration Test Results” chapter of the Yucaipa GSP.

IMPLEMENTING THE PLAN AND ADAPTIVE MANAGEMENT

TASK 9.0 DEFINE IMPLEMENTATION ACTIONS
In this task, our team will develop a plan of action for implementing the projects and management actions
identified in Task 7. The plan includes costs, schedule, annual reporting, and a periodic assessment of
progress towards sustainability.

Deliverables: TM that will become the “Plan Implementation Actions” chapter of the Yucaipa GSP.

TASK 10.0 DESCRIBE EXISTING AND PLANNED MONITORING NETWORK
Our team currently has an updated database of water levels in the basin. We will summarize the known
monitoring programs and activities within the groundwater basin that can be used to meet SGMA
requirements. Identifying existing monitoring points will help our team determine the scale of the
monitoring plan needed to consistently collect data to evaluate progress and meet all sustainability goals.
There are sufficient monitoring points to develop a groundwater monitoring network to provide on-going
monitoring for SGMA thresholds. However, specific monitoring points, including the USGS monitoring
system, will be selected to collect data that will be used for on-going evaluation of the sustainability
indicators.
Subsidence monitoring is a unique subset of the monitoring program. In other regions, land subsidence
in relation to groundwater withdrawals has occurred where fine-grained soils have been dewatered
resulting in hydrocompaction. We will confirm or expand on our current understanding from previous
project areas with soils that are potentially susceptible to hydrocompaction. Geoscience has provided
subsidence condition monitoring and assessment for more than 20 years. Geoscience designed and is
currently overseeing extensometer construction for the Rancho California Water District to help assess
land subsidence. More recently, we have added InSar imagery evaluation to the extensometer data to

Yucaipa Sustainable Groundwater Management Agency - August 9, 2018 - Page 11 of 208