Upper and Lower Ventura River Groundwater Basins: Groundwater - - PowerPoint PPT Presentation

Daniel B. Stephens & Associates, Inc.

Upper and Lower Ventura River Groundwater Basins:

Groundwater Budget and Approach for a Groundwater Management Plan

Jordan Kear, PG, CHg

Ventura River Watershed Council Project Kickoff Meeting 25 May 2010

Daniel B. Stephens & Associates, Inc.

Daniel B. Stephens & Associates, Inc.

Upper Ventura River – 11.6 mi2 Lower Ventura River – 8.3 mi2

Daniel B. Stephens & Associates, Inc.

Project Kickoff Meeting Objectives

 Discuss the scope of work and pertinent details of the project  Comments solicited from stakeholders  Display the scope and extent of the project, present schedules, and importantly, request information from the stakeholders that are present.

Daniel B. Stephens & Associates, Inc.

Daniel B. Stephens & Associates, Inc.

Scope of work

 Task 1 – Project Kickoff Meeting  Task 2 – Review Available Information  Task 3 – Coordinate with other agencies  Task 4 – Prepare draft groundwater budget  Task 5 – Present draft groundwater budget  Task 6 – Prepare complete draft  Task 7 – Prepare Final Groundwater budget and Approach for GWMP

Daniel B. Stephens & Associates, Inc.

Task 2 – Obtain and Review Available Information

 Target data and information:

Lithologic logs Additional borehole geophysical logs Well construction data and information Water-well video surveys Aquifer testing data and results Power company testing data Pumping rates Groundwater Extraction Quantities Additional water level measurements Additional water quality data Location data for sites of environmental concern Chemical data for sites of environmental concern Other pertinent data from respective agencies

Daniel B. Stephens & Associates, Inc.

Task 3 – Coordinate with Agencies and Stakeholders

 Sources of target data and information:

County of Ventura Watershed Protection District (WPD) Casitas Municipal Water District (CMWD) California Department of Water Resources (DWR) California Department of Toxic Substances Control (DTSC) Water purveyors Ojai Valley Sanitary District Ojai Basin Groundwater Management Agency Resource Conservation Districts Cooperating private ranch owners and property owners Local water well drillers United States Geological Survey (USGS) Division of Oil, Gas, and Geothermal Resources (DOG) California State Water Resources Control Board (SWRCB) California Regional Water Quality Control Board Los Angeles Region (RWQCB) California Department of Health Services

Daniel B. Stephens & Associates, Inc.

Task 4 – Prepare a Draft Groundwater Budget and Approach for GWMP

 Groundwater Budgeting:

Inflow minus Outflow equals Change in storage

Daniel B. Stephens & Associates, Inc.

INFLOW COMPONENTS

Precipitation Streamflow Subsurface inflow Reservoir Losses Irrigation Return Flow Human Return Flow

Daniel B. Stephens & Associates, Inc.

OUTFLOW COMPONENTS

Evaporation Transpiration Surface outflow Subsurface outflow Groundwater Pumping

Daniel B. Stephens & Associates, Inc.

0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 40.00 Jun-68 Dec-73 May-79 Nov-84 May-90 Oct-95 Apr-01 Oct-06 Apr-12

Change in storage

Daniel B. Stephens & Associates, Inc.

Task 5 – Present Draft GW Budget & Approach for GWMP

 To this forum, 75% draft  Draft Report issued simultaneously

Task 6 – Incorporate comments into Complete Draft Report

 To the WPD  90% Draft Report

Daniel B. Stephens & Associates, Inc.

Task 7 – Prepare and submit final Complete Groundwater Budget Report and Approach for GWMP

 Incorporates agency and peer comments

Daniel B. Stephens & Associates, Inc.

Deliverable/Task By Date Task 1: Kick-off Meeting May 25, 2010 Task 2: Review of available information Ongoing Task 3: Coordinate with other agencies Ongoing Deliverable 2/Task 4 and 5: Prepare Draft Budget/ Approach to GWMP and conduct presentation of Draft at VRWC meeting July 27, 2010 Deliverable 3/Task 6: Final Draft September 2010 Deliverable 4/Task 7: Final Groundwater Budget November 15 2010

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