San Fernando Valley Water Supply and Groundwater Basin...San Fernando Valley Water Supply and...
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seeps Documented sources of potential groundwater contamination occur across western San Fernando Valley (geotracker.swrcb.ca.gov). • Municipal water supply wells are limited to the eastern side of San Fernando Valley. • Relatively flat water level hydrographs indicate minimal groundwater production across western SFV. • The use of private wells is severely limited by the adjudication of SFV water rights. 460 480 500 520 540 560 Jan-55 Jan-60 Jan-65 Jan-70 Jan-75 Jan-80 Jan-85 Jan-90 Jan-95 Jan-00 Jan-05 Jan-10 Groundwater Level Elevation (ft msl) Well 3811E 760 780 800 Jan-80 Jan-85 Jan-90 Jan-95 Jan-00 Jan-05 Jan-10 Groundwater Level Elevation (ft msl) Well 4747D Well defined plumes of groundwater contamination occur in eastern San Fernando Valley >18 miles from SSFL. Contaminant sources and responsible parties have been identified by the Los Angeles Regional Water Quality Control Board and U.S. EPA (San Fernando Valley Superfund Site Groundwater Monitoring Program 2010 Report, USEPA). SSFL MAP AREA San Fernando Valley Water Supply and Groundwater Basin The valley-fill aquifer underlying the ~200-square-mile SFV is >1,000 feet thick toward the eastern end of the basin, where it serves as an important regional water supply, despite contamination from local industry. The aquifer beneath the western two-thirds of the basin is relatively unproductive and little used. 10,000 10,000 23,000 6,600 54,000 900 125 San Fernando Valley Estimated Average Sources of Groundwater Recharge (acre-feet/year) Valley floor recharge of local rainfall and runoff Mountain front recharge of local rainfall and runoff Spreading basin recharge of local runoff Spreading basin recharge of imported water "Return flows" (20% of delivered water) Groundwater inflow from adjoining basins SSFL recharge that flows into basin Estimates adopted from water balance presented in San Fernando Basin Groundwater Model Documentation (USEPA,1994). Groundwater flow from SSFL is estimated to account for roughly 1/10 of 1% of SFV recharge. 165,000 50,000 17,000 8,000 13,000 10,000 San Fernando Valley Estimated Average Water Supply (acre-feet/year) LADWP imported water LADWP locally pumped groundwater Glendale PSD imported water Glendale PSD locally pumped groundwater Burbank PSD imported water Burbank PSD locally pumped groundwater Estimates adopted from data provided in Upper Los Angeles River Area Watermaster annual reports. Groundwater flow from SSFL is estimated to account for roughly 1/20 of 1% of the SFV water supply. Vertical Exaggeration = 10 San Fernando Valley Simi Hills 1:1 scale Simulations using a 3-D groundwater flow model indicate that groundwater recharged at SSFL is split roughly equally between discharge to hillside seeps and deep flow into the surrounding valleys (Appendix 6-A of the SSFL Groundwater RI Report). seeps Alluvial and Saugus Fm Aquifer 6//24/2011
Transcript of San Fernando Valley Water Supply and Groundwater Basin...San Fernando Valley Water Supply and...
seeps
Documented sources of potential groundwater contamination occur across western San Fernando Valley (geotracker.swrcb.ca.gov).
• Municipal water supply wells are limited to the eastern side of San Fernando Valley.
• Relatively flat water level hydrographs indicate minimal groundwater production across western SFV.
• The use of private wells is severely limited by the adjudication of SFV water rights.
460
480
500
520
540
560
Jan-55 Jan-60 Jan-65 Jan-70 Jan-75 Jan-80 Jan-85 Jan-90 Jan-95 Jan-00 Jan-05 Jan-10
Gro
undw
ater
Lev
el E
leva
tion
(ft m
sl) Well 3811E
760
780
800
Jan-80 Jan-85 Jan-90 Jan-95 Jan-00 Jan-05 Jan-10
Gro
undw
ater
Le
vel E
leva
tion
(ft m
sl)
Well 4747D
Well defined plumes of groundwater contamination occur in eastern San Fernando Valley >18 miles from SSFL. Contaminant sources and responsible parties have been identified by the Los Angeles Regional Water Quality Control Board and U.S. EPA (San Fernando Valley Superfund Site Groundwater Monitoring Program 2010 Report, USEPA).
SSFL
MAP AREA
San Fernando Valley Water Supply and Groundwater Basin The valley-fill aquifer underlying the ~200-square-mile SFV is >1,000 feet thick toward the eastern end of the basin, where it serves as an important regional water
supply, despite contamination from local industry. The aquifer beneath the western two-thirds of the basin is relatively unproductive and little used.
10,000
10,000
23,000
6,600
54,000
900 125
San Fernando Valley Estimated Average Sources of Groundwater Recharge (acre-feet/year)
Valley floor recharge of local rainfall and runoffMountain front recharge of local rainfall and runoffSpreading basin recharge of local runoffSpreading basin recharge of imported water"Return flows" (20% of delivered water)Groundwater inflow from adjoining basinsSSFL recharge that flows into basin
Estimates adopted from water balance presented in San Fernando Basin Groundwater Model Documentation (USEPA,1994).
Groundwater flow from SSFL is estimated to account for roughly 1/10 of 1% of SFV recharge.
165,000 50,000
17,000
8,000 13,000 10,000 San Fernando Valley Estimated Average
Water Supply (acre-feet/year)
LADWP imported waterLADWP locally pumped groundwaterGlendale PSD imported waterGlendale PSD locally pumped groundwaterBurbank PSD imported waterBurbank PSD locally pumped groundwater
Estimates adopted from data provided in Upper Los Angeles River Area Watermaster annual reports.
Groundwater flow from SSFL is estimated to account for roughly 1/20 of 1% of the SFV water supply.
Vertical Exaggeration = 10
San Fernando Valley
Simi Hills
1:1 scale
Simulations using a 3-D groundwater flow model indicate that groundwater recharged at SSFL is split roughly equally between discharge to hillside seeps and deep flow into the surrounding valleys (Appendix 6-A of the SSFL Groundwater RI Report).
seeps
Alluvial and Saugus Fm Aquifer
6//24/2011
24/06/2011 1
TCE Depth Profile to 1400 Feet from
Coreholes C6 and C15
Heights of
Average
Americans:
Male: 5’10”
Female: 5’4”
Str
ati
gra
ph
y
Dep
th
Canyon
Mbr C
Happy
Valley
Mbr
Bowl
Mbr
Lower Sage
Mbr
Upper
Woolsey
Mbr
Upper
Canyon Mbr
Lower
Canyon
Mbr
Canyon Shale
Total Equivalent TCE
(µg/L Porewater)
C6
C15
Op
en
Ho
le
Op
en
Ho
leC
asin
g
890 ft
Location of Coreholes
1907 m
Area IIC6
C15
Coreholes are located 50 feet apart in Area II
near Delta test stand. C6 was initially drilled
2001 and deepened in 2003, C15 was
completed during a follow up study in 2009.
The casing of C15 extends from ground
surface to the depth at the bottom of C6
(~ 890m).
TCE Plumes
Field view of C6 and C15 coreholes and drill
rig on site.
Retrieval of core in 5 fool lengths is followed
by photographing, visual inspection and
recording of hydrogeologic properties
including; fractures, lithology, mineralogy etc.
Rock CrusherCore is sub-
sampled,
crushed and
preserved in
methanol for
shipping and
laboratory
analysis of
VOC’s.
Drilling Coreholes
Sampling and Analysis
Core Collection and Inspection
Prepared by Jonathan Kennel and Kristina Small, G360, June 24th 2011
