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Groundwater Basin Assessment Study

Groundwater Basin Assessment Study. Southern California Water Dialogue January 24, 2007. In-Basin Groundwater Storage Projects. 1. 3. 12. 9. 4. Approved Projects N. Las Posas (Phases 1&2) Long Beach Foothill MWD TVMWD / La Verne Chino Basin Orange County Basin Compton

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Groundwater Basin Assessment Study

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  1. Groundwater Basin Assessment Study Southern California Water Dialogue January 24, 2007

  2. In-Basin Groundwater Storage Projects 1 3 12 9 4 Approved Projects N. Las Posas (Phases 1&2) 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 6 Pending Projects Central Basin MWD Identified Projects Raymond Basin - Foothill MWD & Pasadena

  3. Identified Existing IRP Target 350 300 250 Thousands AF 200 150 100 50 0 2005 2006 2010 2020 2025 In-Region Groundwater Storage Resources

  4. Scope of Assessment Study • Use of existing data and reports • Service area overview • Detailed review of 23 sub-areas

  5. Scope of Assessment Study • Basin hydrogeology • Governance • Facilities and operations • Water levels • Water quality • Storage programs

  6. Groundwater Basins

  7. Raymond Basin Monkhill Pasadena SantaAnita

  8. MSGB Production

  9. MSGB Key Well Water Level

  10. ULARA Precipitation

  11. Central Basin Direct Recharge

  12. Table 1 Summary of Hydrogeologic Parameters of Chino and Cucamonga Basins Structure Aquifer(s) Upper aquifer: Unconfined Deep aquifer: Confined Unconfined Yield and Storage Natural Safe Yield 140,000 AFY 13,800 AFY to22,200 AFY Adjudication Amount 145,000 AFY 22,721 AFY Total Storage ~ 6 million AF Unknown Unused Storage Space ~1 million AF Unknown Avail. Storage Space ~500,000 AF Unknown Chino Basin Aquifer Capability Parameter Chino Basin Cucamonga Basin Source: Wildermuth, 2005 and DWR, 2004

  13. Agency Role California Department ofWater Resources Court appointed Watermaster to manage water quantity Water Replenishment Districtof Southern California Groundwater replenishment in Central and West Coast Basins Los Angeles CountyDepartment of Public Works Operation of spreading facilities and Alamitos Barrier facilities Sanitation Districts ofLos Angeles County Produces recycled water for MontebelloForebay Spreading Grounds Los Angeles Regional Water Quality Control Board Issuance of permit for spreading of recycled water in Montebello Forebay CentralBasin Governance

  14. 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

  15. Table 5 Summary of Constituents of Concern in Main San Gabriel Basin MSGB Water Quality Issues 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 > 2 8 local wells have NDMA above action level of 2 ppt(3 facilities currently in operation) Source: Watermaster, 2004 and DWR, 2003

  16. MSGB Treatment Operations TreatmentType # ofWells Contaminant TreatmentTarget TreatmentCost($/AF) AmountTreated(AFY) 39 VOCs ND $25 47,000 AirStripping LPGAC 16 VOCs ND Varies 14,000 Ultra-Violet/ Oxidation 9 1,4-Dioxane ND $100 6,000 Ion Exchange 17 Perchlorate ND $200 6,000 Ultra-Violet 12 NDMA ND $100 6,000 Total 93 -- ND -- 79,000

  17. 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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