Moorpark Desalter - Pilot Well Test Project

Public Works Agency
Water and Sanitation
Department
Ventura County Waterworks District No. 1
Moorpark Desalter
Pilot Well Test Project
Presentation to the Las Posas Users Group/
Fox Canyon Groundwater Management Agency
Reddy Pakala
Director, Water and Sanitation Department
Public Works Agency
February 27, 2013
Slide 1
Local Groundwater Basins within the FCGMA
South
Las Posas Basin
(Yellow)
East Las Posas
West Las Posas
Pleasant
Valley
Oxnard Plain
Proposed
Moorpark
Desalter
February
February27,
16,2013
2012
Slide 2
Moorpark Desalter – District 1 Service Area/Test Site
VC Waterworks
District No. 1
(Area in Yellow)
Waterworks District No. 19
Service Area
Proposed
Moorpark Desalter
Pilot Well Test Site/
Proposed
Well Field Site
Moorpark Wastewater
Treatment Plant
February 27, 2013
Ventura County Waterworks District No. 1
Slide 3
Scope/Cost/Schedule
Scope of Construction and Development Included:
• Three (3) engineering or test holes:
• Two (2) test wells:
• One (1) nested (3-level) monitoring well
Cost/Funding
• Construction cost:
• Fox Canyon GMA Grant:
800 ft deep; 8” in dia.
360 ft deep; 8” in dia.
800 ft deep; 8” in dia.
$363,346
$220,000
Ventura County Brush Fire
Project Team and Schedule
•
•
•
•
Hydrogeologist:
Hopkins Groundwater Consultants, Ventura
Contractor:
Hansen Well-Do Service, Inc. Oak View
Project Manager:
Eric Keller
Construction and Testing Schedule: 4/2012 – 11/2012
Ventura County Brush Fire
February 27, 2013
Ventura County Waterworks District No. 1
Slide 4
Wells Site Location
Moorpark Desalter Pilot Well Test Project, Ventura County WWD No. 1, Moorpark, CA
HOPKINS
GROUNDWATER
CONSULTANTS
February 27, 2013
Ventura County Waterworks District No. 1
Slide 5
Ventura County Waterworks District No. 1
Moorpark Desalter - Pilot Well Test Project
Test Well No. 1
Nine –Day Constant Discharge Test
Maximum Production
195 gpm
Static Water Level
8.5 ft bgs*
Pumping Level
72.3 ft bgs
Drawn-Down
63.8 ft bgs
Maximum Specific Capacity
3.1 gpm/ft
Aquifer Parameters
• Transmissivity
(Hydraulic Conductivity)
• Storage-Coefficient
7,500 gpd/ft
N/A
* bgs – Below Ground Surface
245’
Not to Scale
BOTTOM OF DEVELOPED WELL
Ventura County Waterworks District No. 1
Slide 6
Ventura County Waterworks District No. 1
Moorpark Desalter - Pilot Well Test Project
Test Well No. 2
Seven-Day Constant Discharge Test
Maximum Production
Static Water Level
20.7 ft bgs
Pumping Level
53.4.ft bgs
Drawn-Down
32.7 ft bgs
Maximum Specific Capacity
Aquifer Parameters
• Transmissivity
(Hydraulic Conductivity)
• Storage-Coefficient
235’
Not to Scale
550 gpm
17.14 gpm/ft
55,500 gpd/ft
0.0065
BOTTOM OF DEVELOPED WELL
Ventura County Waterworks District No. 1
Slide 7
Ventura County Waterworks District No. 1
Moorpark Desalter - Pilot Well Test Project
Nested
Monitoring
Well
Not to Scale
Ventura County Waterworks District No. 1
Slide 8
February 27, 2013
Ventura County Waterworks District No. 1
Slide 9
Ventura County Waterworks District No. 1
Moorpark Desalter - Pilot Well Test Project
February 27, 2013
Ventura County Waterworks District No. 1
Slide 10
Ventura County Waterworks District No. 1
Moorpark Desalter - Pilot Well Test Project
February 27, 2013
Ventura County Waterworks District No. 1
Slide 11
Test Results
Wide Variability in
Subsurface Conditions
(Aquifer Materials and
Saturated Thickness)
Production Range:
150 gpm to 600 gpm
Range of Depth
to Groundwater:
10 ft to 20 ft bgs
Depth of
Production Wells:
250 ft bgs
Ventura County Brush Fire
Range of Draw Down:
30 ft to 70 ft
Anticipated Wellfield
Production:
Up to 3,875 gpm
(Dependent upon Proximity
to the Arroyo Simi Channel)
Ventura County Brush Fire
February 27, 2013
Ventura County Waterworks District No. 1
Slide 12
Public Works Agency
A
Map of South Las Posas Basin
Proposed Future
Moorpark Desalter
Well Field
Site
Moorpark Wastewater
Treatment Plant
Arroyo Simi
Arroyo Las Posas
A'
Slide 13
Ventura County Waterworks District No. 1
Ventura County Waterworks District No. 1
Moorpark Desalter - Pilot Well Test Project
Fox Canyon Aquifer and Shallow Aquifer
February 27, 2013
Ventura County Waterworks District No. 1
Slide 14
Next Steps

Prepare and calibrate a 3-dimensional groundwater model (latest
MODFLOW version with VISTAS).
•
Analyze for:
•
•
•

Different scenarios for the number of wells, spacing, production (gpm)
and distance from the Arroyo Simi Channel
Impacts to nearby wells and to the East Las Posas Basin (Fox Canyon
Aquifer)
Migration of salts.
Coordinate and finalize well spacing, depth, and distance from the Arroyo
Simi in consultation with the California Department of Public Health.
Ventura County Brush Fire

Determine the number of wells, production (gpm), spacing, and distance
from the Arroyo Simi to produce up to 5,000 AF/year of treated
water matching State Water Project water quality.

Quantify stream recharge and underground storage created
by the proposed Moorpark Desalter Project.
Ventura County Brush Fire
February 27, 2013
Ventura County Waterworks District No. 1
Slide 15
Public Works Agency
Water and Sanitation
Department
Preliminary Assessment of
Water Supply Conditions for
the Las Posas Aquifer
Presentation to the Las Posas Users Group (LPUG)
Reddy Pakala
Director, Water and Sanitation Department
Public Works Agency
February 27, 2013
Slide 1
Purpose
 Help Calleguas Creek Watershed stakeholders to comply
with salts TMDLs adopted by LARWQCB/EPA in
October 2007.*
 Respond to GMA regarding available brackish groundwater
for future desalter projects in the South Las Posas Basin
(Shallow Aquifer).
 Identify missing data gaps (Item No. 10*).
 Identify future capital projects to increase
stormwater recharge to the
South Las Posas Aquifer (Item No. 11*).
* Note: Refer to the “Preliminary Assessment of Water Supply
Conditions – Las Posas Aquifer”, dated February 21, 2013.
February 27, 2013
Ventura County Water and Sanitation Department
Slide 2
Water Supply to/Discharge from
Simi Valley Wastewater Treatment Plant

Ventura County Waterworks District No. 8 (Simi Valley) imports more
than 95% of its water supply from Calleguas and provides 75% of the water
demands for the City of Simi Valley (City). Provides some reclaimed water
and treated groundwater to its customers.

Golden State Water Company provides 25% of the City’s water demands.
It’s water supply comes from both imported and local groundwater sources.

Simi Valley Wastewater Treatment Plant (known as the Simi Valley Water
Quality Control Plant [SVWQCP]), discharges to the Arroyo Simi Channel
under a NPDES permit from the EPA/LARWQCB. Has been discharging to
the Arroyo Simi Flood Control Channel since the early 1960’s.

Discharged water is considered “Waters of the United States” and is subject
to requirements from the U.S. Department of Fish and Wildlife for future
reclamation projects.

Estimated inflow to the SVWQCP at build-out capacity is 14,000 AF/yr.
February 27, 2013
Ventura County Water and Sanitation Department
Slide 3
Water Supply to/Discharge from
Moorpark Wastewater Treatment Plant
Ventura County Waterworks District No. 1 (WWD No. 1 )

Imports 80% of its water from Calleguas. Remaining water supply is from 6 groundwater wells.

Extracts its groundwater under GMA annual historical allocations (reduced by 25%).

Provides water supply to 176 agricultural customs (mostly outside the City of Moorpark
city limits).

95% of the local groundwater is for agricultural purposes.

Moorpark Wastewater Treatment Plant, also known as the Moorpark Water Reclamation Facility
(MWRF), discharges treated water to the South Las Posas Basin through on-site percolation ponds
under a WDR permit from the LARWQCB.

MWRF has been recharging to the South Las Posas Basin since 1960 (more than 50 years).

Estimated inflow to the Moorpark Wastewater Treatment Plant at its build-out capacity is
5,590 AF/yr.
Ventura County Waterworks District No. 1
Moorpark County Club Golf Course
Supplied with Recycled Water since 2004
February 27, 2013
Ventura County Water and Sanitation Department
Slide 4
Methodology
 Current inflows to the aquifer from SVWQCP and MWTP discharges are based on
EPA/LARWQCB permits and other documents.
 Outflows are based on current reclamation, near-term reclamation projects, and
long-term projects by WWD No. 8 (Simi Valley) and WWD No. 1 (Moorpark).
 Long-term reclamation projects’ annual consumption was estimated based on:
 Our experience in planning, design, and construction of a reclamation project and
wastewater treatment plants
 Operation of the WWD No. 1 recycled water system
 The Urban Water Management Plans for WWD No. 8 (Simi Valley) and
WWD No. 1(Moorpark).
 We have assumed that a Simi Valley desalter will be constructed after 10 years
when Calleguas extends the Salinity Management Pipeline to Simi Valley
(Items Nos. 6A and 6B*).
* Note: Refer to the “Preliminary Assessment of Water Supply Conditions – Las Posas Aquifer”, dated
February 21, 2013.
February 27, 2013
Ventura County Water and Sanitation Department
Slide 5
Preliminary Assessment of
Water Supply Conditions - Las Posas Aquifer
Current
Conditions
(+) 12,130 AF)
(+) Data Gaps
(9A, B, C, D, & E)
(Stormwater
Recharge)
Projected
Flows
Projected
Flows
(2017 thru 2021)
(2022 thru 2028)
4 to 8 Years
(+) 12,195 AF
(+) Data Gaps
9 to 15 Years
(+) 10,339 AF
(+) Data Gaps
Projected
Flows
(2029 Thru 2038)
16 to 25 Years
(+) 10,470 AF
(+) Data Gaps
Projected
Flows
Beyond 25 Years
(+) 10,470 AF
(+) Data Gaps
(+) Capital Projects
in Item No. 10
• Data gaps in Item No. 9 will add additional water supply to the aquifer.
• Our recommendation is for LPUG or GMA to fill the data gaps in the next two to
four years.
February 27, 2013
Ventura County Water and Sanitation Department
Slide 6