Groundwater Basin Assessment Study

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Groundwater Basin Assessment Study

• Southern California Water Dialogue
• January 24, 2007

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In-Basin Groundwater Storage Projects
1
3
12
9
4

• Approved Projects
• N. Las Posas (Phases 12)
• Long Beach
• Foothill MWD
• TVMWD / La Verne
• Chino Basin
• Orange County Basin
• Compton
• Long Beach - Lakewood
• Upper Claremont Heights TVMWD
• Western MWD /Elsinore Valley

5
11
7
2
8
10
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• Pending Projects
• Central Basin MWD

• Identified Projects
• Raymond Basin - Foothill MWD Pasadena

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In-Region Groundwater Storage Resources


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Scope of Assessment Study

• Use of existing data and reports
• Service area overview
• Detailed review of 23 sub-areas

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Scope of Assessment Study

• Basin hydrogeology
• Governance
• Facilities and operations
• Water levels
• Water quality
• Storage programs

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Groundwater Basins
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Raymond Basin
Monkhill
Pasadena
SantaAnita
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MSGB Production
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MSGB Key Well Water Level
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ULARA Precipitation
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Central Basin Direct Recharge
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Chino Basin Aquifer Capability
Table 1 Summary of Hydrogeologic Parameters of
Chino and Cucamonga Basins  
Chino Basin
Cucamonga Basin
Parameter
Source Wildermuth, 2005 and DWR, 2004
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Central Basin Governance
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Chino Spreading Capability(Partial List)
Basin
Wetted Area(acres)
RechargeCapacity(cfs)
RechargeCapacity (AFY)
Source Water
Owner
BrooksStreet
7.7
5
3,000
Runoff Imported
CBWCD
Montclair
28.2
10
7,770
Runoff Imported
CBWCD
7th 8thStreet
14.5
5
1,350
Runoff
SBCFCD
Upland
10.1
4
2,730
Runoff Imported
City ofUpland
Ely
35.7
3
2,880
Runoff Recycled
SBCFCD/CBWCD
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MSGB Water Quality Issues
  Table 5 Summary of Constituents of Concern in
Main San Gabriel Basin  
Constituent
Range
Description
TDS (mg/L)
90 to 4,288 Average 367
Municipal wells indicate a range of 172 to 914
mg/L(average of 318 mg/L)
Nitrate as N (mg/L)
ND to 27.8
Exceed nitrate MCL in eastern portion of basin.
VOCs TCE and PCE (µg/L)
TCE ND to 499 PCE ND to 330
64 wells are currently treated for VOCs
Perchlorate (µg/L)
ND to 183
22 wells removed from service due to perchlorate
levels (treatment facilities are currently online)
NDMA (ppt)
ND to gt 2
8 local wells have NDMA above action level of 2
ppt(3 facilities currently in operation)
Source Watermaster, 2004 and DWR, 2003
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  MSGB Treatment Operations
TreatmentType
ofWells
Contaminant
TreatmentTarget
TreatmentCost(/AF)
AmountTreated(AFY)
39
VOCs
ND
25
47,000
Air Stripping
LPGAC
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VOCs
ND
Varies
14,000
Ultra-Violet/ Oxidation
9
1,4-Dioxane
ND
100
6,000
Ion Exchange
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Perchlorate
ND
200
6,000
Ultra-Violet
12
NDMA
ND
100
6,000
Total
93
--
ND
--
79,000
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Summary

• Baseline report that expands upon DWR Bulletin
  118 and the AGWA report
• Overview of basin management and use
• Report complete later this year

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