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Groundwater Rise in Kearny Mesa

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by Tony Sawyer on 1 October 2013

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Transcript of Groundwater Rise in Kearny Mesa

South Miramar Landfill
Two monitoring wells - one shallow and one deep
Mobil Station
Well MW-6 is screened shallow (5 to 15 feet BGS) and shows fluctuating depth to groundwater between 6 and 9 feet.
Well MW-7 is screened from 35 to 50 feet BGS and groundwater has risen an average of 1.13 feet per year since 2007. On 9/7/2012, groundwater was 30.96 feet BGS.
The groundwater gradient is to the northwest.
San Diego Fence
General Dynamics
Nineteen monitoring wells
Ryder Truck Rental
Eight groundwater monitoring wells
County Operations Center
Average rise in groundwater of 2 ft/yr between 2002 and 2005 in two shallower wells. In 2005, groundwater was approximately 67 feet BGS. Wells are screened between 60 and 80 feet BGS.
Fluctuating groundwater levels between 2002 and 2005 in deep well. In 2005, groundwater was approximately 82 feet BGS. Well was screened between 80 and 110 feet BGS.
Gradient could not be determined.
and Its Implications on Human Health Risk
An Investigation Into Anomalous Rising Groundwater Levels Beneath Kearny Mesa
by Tony Sawyer, PG, CHG and Ronel Skoda
Observations:

There is an anomalous rise in the groundwater level in the Kearny Mesa area

There appears to be a vertically downward groundwater gradient

The source of the recharge appears to be east of Highway 163 and south of Clairemont Mesa Boulevard

Saturated near-surface soils are limiting vapor migration
Average rise in groundwater of 0.7 ft/yr since 2005 in shallow well. In 2012, groundwater was approximately 18 feet below ground surface (BGS)
Average rise in groundwater of 1 ft/yr since 2005 in deep well. In 2012, groundwater was approximately 201 feet BGS
Gradient could not be determined
MW-9S
MW-9D
MW-10
MW-11
MW-6
MW-7
`
RediCare
MW-4
MW-1
In MW-1, the groundwater level has risen 7.86 feet over 12 years, or an average of 0.66 foot/year
In MW-4, the groundwater level has risen 7.18 feet over 12 years, or an average of 0.6 foot/year
The groundwater gradient is to the northeast
MW-12
MW-10
The groundwater levels have remained fairly consistent between around 17 and 20 feet BGS.
The groundwater gradient is indeterminant
MW-1
MW-100
MW-101A
Three monitoring wells at two different depths
Fourteen monitoring wells
Thirteen groundwater monitoring wells
MW-5
MW-4
MW-1
All the wells show a consistent rise in groundwater levels starting as early as 1995.
A remediation system operated for a year (2009-2010) and significantly influenced the nearest wells.
In MW-4 (at the edge of the radius of influence of the remediation system), the groundwater level has risen 25 feet over 11 years, or an average of 2.27 feet/year
The wells are screened in the 30 to 70 feet BGS range
The groundwater gradient is to the northeast
MW-7B
No Data Submitted to Geotracker
MW-7C
MW-5
MW-6
MW-4
MW-8
No Data Submitted to Geotracker
MW-14
SB-14A-1
No Data Submitted to Geotracker
MW-14A
SB-14D-1
No Data Submitted to Geotracker
MW-14D
PZ-01A
No Data Submitted to Geotracker
MW-15B
MW-15C
MW-15A
MW-16A
MW-16C
MW-2
MW-9
No Data Submitted to Geotracker
MW-10
MW-12
No Data Submitted to Geotracker
MW-11
MW-13
No Data Submitted to Geotracker
MW-3
MW-1
All the wells show a consistent rise in groundwater levels starting as early as 1998.
In MW-1, the groundwater level has risen 84 feet over 15 years, or an average of 5.6 feet/year
The wells are screened in three different zones, showing different amounts of groundwater rise
The groundwater gradient is to the south and east
Groundwater levels have risen highest near the Dog Park
Changes in health risk
Conclusions:

It is very likely that the source is leaking water supply lines and/or recharge from new development irrigation or infiltration ponds

The rise in the groundwater has resulted in increased calculated health risks directly above the center of the plume

The influx of clean water will serve as a barrier to contaminant migration vertically.

Further evaluation of other sites in the vicinity for similar changes in groundwater and health risks is underway. Recently, Brown & Caldwell installed another deep well and a Vibrating Wire Piezometer to further define the anomalous groundwater conditions
Authors:
Tony V. Sawyer, PG, CHg, CEG, Hydrogeologist with San Diego County Department of Environmental Health Site Assessment and Mitigation Program (DEH SAM), tony.sawyer@sdcounty.ca.gov
Ronel Skoda, Environmental Health Intern, DEH SAM

Sources:

All data and figures used in this presentation were obtained through Geotracker, the internet or the County GIS and are in the public domain, except for the health risk charts. Those were prepared by Ronel Skoda of the San Diego County Department of Environmental Health.

fin
Piezometric Head over Time
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