$T$T Big Bear Dam "! 38 "! 18. Figure 8 ISOHYETAL MAP BIG BEAR LAKE AND BALDWIN LAKE WATERSHEDS GEOHYDROLOGIC EVALUATION OF ARTIFICIAL RECHARGE

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1 BIG BEAR AREA REGIONAL WASTEWATER AGENCY SAN BERNARDINO MOUNTAINS GEOHYDROLOGIC EVALUATION OF ARTIFICIAL RECHARGE POTENTIAL IN THE BIG BEAR VALLEY, CALIFORNIA ISOHYETAL MAP BIG BEAR LAKE AND BALDWIN LAKE WATERSHEDS "! 18 T.3 N. T.1 N Gray's Landing $T$T Big Bear Dam 26 Grout Creek Big Bear Lake Mill Creek North Shore Village 10 Van Dusen VAN DUSEN CANYON SITE "! 38 "! 18 Rathbone Division 8 $T "! 38 #S East Baldwin West Baldwin Big Bear Community Services District 16 Erwin Baldwin Lake (dry) Erwin Lake SHAY MEADOW SITE GREEN SPOT SITE 16 %U EXPLANATION Average Annual Precipitation (in.) (Source: San Bernardino County Flood Control District) $T Weather Station San Bernardino County Flood Control District #S Big Bear City Community Services District Evaporation Pan Location of Recharge Areas Under Investigation Big Bear Lake Watershed Boundary with Hydrologic s Baldwin Lake Watershed Boundary with Hydrologic s State Highway Surface Water Dry Playa Lake Creek or Drainage Channel 34 SAND CANYON SITE 30 T.2 N. T.1 N. 18 R.1 W. R.1 E. R.1 E. R.2 E. 1-OCT-04 Prepared by: DWB Map Projection: UTM Zone 11, NAD27 Central Meridian: -117 degrees Miles Figure 8 GIS_proj\bbarwa_vdc_gs_summary_rpt\bbarwa_summary_rpt.apr

2 Big Bear Area Regional Wastewater Agency Geohydrologic Evaluation of Artificial Recharge Potential in the Big Bear Valley, California Conceptual Diagram of Artificial Recharge Test Spreading Basin Potable Water Monitoring Well Monitoring Well Extraction Well Recharging Water Ground Water Mound AQUIFER 1-Oct-04 Note: vertical scale is exaggerated Figure 7

3 Figure 6 Big Bear Area Regional Wastewater Agency Geohydrologic Evaluation of Artificial Recharge Potential in the Big Bear Valley, California Photograph of Pilot Spreading Basin Construction (View Looking Northwest During Construction of the Pilot Recharge Basin at the Green Spot Site) 1-Oct-04

4 Big Bear Area Regional Wastewater Agency Figure 5 Geohydrologic Evaluation of Artificial Recharge Potential in the Big Bear Valley, California Photograph of Monitoring Well Construction (Construction of Monitoring Well GS MW-1 at the Green Spot Site) See Figure 16 for location. 1-Oct-04

5 Figure 4 Big Bear Area Regional Wastewater Agency Geohydrologic Evaluation of Artificial Recharge Potential in the Big Bear Valley, California Photograph of Single-Ring Infiltrometer Testing (Single-Ring Infiltrometer Test at the Green Spot Site Prior to Full-Scale Pilot Testing) 1-Oct-04

6 Big Bear Area Regional Wastewater Agency Figure 3 Geohydrologic Evaluation of Artificial Recharge Potential in the Big Bear Valley, California Photograph of Borehole Drilling (Drilling of Green Spot BH-1 using the Dual Tube Reverse Circulation Drilling Method.) See Figure 16 for location of GS BH-1. 1-Oct-04

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8 Big Bear Area Regional Wastewater Agency Geohydrologic Evaluation of Artificial Recharge Potential in the Big Bear Valley, California Recharge Site Evaluation Process Initial Evaluation Basis 1. Permeability of Unsaturated Zone Initially Perform Reconnaissance and Evaluate Potential Recharge Sites Based on Existing Geohydrological Data 2. Presence of Clay Layers 3. Depth to Ground Water Develop Prioritized List of Candidate Sites for Environmental Studies and Further Geohydrological Investigations Including Pilot Testing and Analysis (see Table 1) Sand Canyon Site Added by BBARWA 4. Ground Water Quality 5. Proximity to Existing Production Wells Pursue Access to Sites for Environmental Studies, Drilling and Geohydrological Pilot Testing Can Permission to Access Sites be Obtained From Private Owners or Public Agencies? N For Those Sites Where Access is Not Currently Obtainable, Stop Evaluation Process for the Present Y Perform Environmental Studies at Candidate Sites Do Sensitive Species or Cultural Artifacts Exist within Proposed Recharge Pilot Testing Sites? Y Is Mitigation Possible for the Sites Containing Sensitive Species or Cultural Artifacts? N N Y Verify and Supplement Geohydrologic Properties Data at Candidate Sites Through Borehole Drilling and Infiltrometer Tests Are Geohydrological Conditions Favorable to Warrant Proceeding with Surface Spreading Basin Pilot Tests? N Abandon Site Pilot Testing Considerations Y for Sub-Scale Spreading Basins Conduct Geohydrological Pilot Recharge Tests Using A Subscale Surface Spreading Basin at Each Site Analyze and Evaluate Results of Pilot Recharge Tests Including Use of Ground Water Flow Model, and Provide Recommendations on Suitability of Sites Figure 2 1-Oct-04

9 BIG BEAR AREA REGIONAL WASTEWATER AGENCY GEOHYDROLOGIC EVALUATION OF ARTIFICIAL RECHARGE POTENTIAL IN THE BIG BEAR VALLEY, CALIFORNIA GENERAL LOCATION BIG BEAR VALLEY T.3 N. T.1 N. SAN BERNARDINO MOUNTAINS Grout Creek Grout Delamar Mountain Creek North Shore Van Dusen VAN DUSEN CANYON SITE Bertha Ridge Gold Mountain Van Dusen Canyon "! 38 Mt. Doble Valley East Baldwin BBARWA Boundary Shay Creek "! 18 Baldwin Lake (dry) Nelson Ridge Pioneertown Valley %U EXPLANATION Location of Recharge Areas Under Investigation Big Bear Area Regional Wastewater Agency (BBARWA) Boundary Big Bear Lake Watershed Boundary with Hydrologic s Baldwin Lake Watershed Boundary with Hydrologic s State Highway Surface Water Gray's Landing North Creek Big Bear Lake Mill Creek Metcalf Creek Knickerbocker Canyon Village Division "! 38 "! 18 Snow Summit Rathbone West Baldwin Moon Ridge Sand Canyon SAND CANYON SITE Sawmill Canyon Erwin SHAY MEADOW SITE Erwin Lake Deadman's Ridge GREEN SPOT SITE County Inset Los Angeles Dry Playa Lake Creek or Drainage Channel San Bernardino Miles Study Area T.2 N. T.1 N. Clark's Summit Sugarloaf Mountain Orange Pacific Ocean Riverside San Diego I mperial R.1 W. R.1 E. R.1 E. R.2 E. 1-OCT-04 Prepared by: DWB Map Projection: UTM Zone 11, NAD27 Central Meridian: -117 degrees Miles Figure 1 GIS_proj\bbarwa_vdc_gs_summary_rpt\bbarwa_summary_rpt.apr

10 BIG BEAR AREA REGIONAL WASTEWATER AGENCY GEOHYDROLOGIC EVALUATION OF ARTIFICIAL RECHARGE POTENTIAL IN THE BIG BEAR VALLEY, CALIFORNIA GREEN SPOT AREA GROUND WATER MODEL HYDROGRPAHS Shay Rd EXPLANATION West Baldwin Big Bear Blvd East Baldwin Model Boundary Conditions Constant Head #S Erwin Drain No Flow Baldwin Ln Maple Ln $T Erwin Ranch Rd Stream Well Cypress Ln Well Classification Model Boundary $T Monitoring #S Municipal State Ln " Private Well Status $T $T " GREEN SPOT SITE Pumping Non-Pumping Hatchery Dr Example: #S = Pumping Municipal Well Note: Private Well Locations are Approximate. Hydrologic Boundary Creek or Drainage Channel State Highway 38 Streets and Roads 2N27 T.2 N. R.2 E. Section 20 Prepared by: DWB 1-OCT-04 Map Projection: UTM Zone 11, NAD27 Central Meridian: -117 degrees GIS_proj\bbarwa_vdc_gs_summary_rpt\bbarwa_summary_rpt.apr Feet Figure 62

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14 Big Bear Area Regional Wastewater Agency Geohydrologic Evaluation of Artificial Recharge Potential in the Big Bear Valley, California Table 1 Site Evaluation Matrix Evaluation Criteria Site-Wide Impermeable Layers Vadose Zone Permeability Depth to Ground Water Proximity to Production Wells Regulatory Requirement Issues or Local Restraints Area Available for Full-Scale Spreading Basins Weighting Factor 0.21 NO: YES: 5 VOID Raw Score Weighted Score 0.19 <4.0 but <3.0 but <2.0 but <1.0 but <0.5: Surface to Ground Water (feet) 0.17 <150 but <100 but <50: <1,000 but <750 but <500: Raw Score Basis Percolation Rate (ft/day)* Distance (feet) Minimal: Moderate: Significant: Extensive: <5 but <2 but <3/4: Total Potential Basin Area (acres) Total Weighted Score RANK North of Green Spot Spring (Area 1) Van Dusen Canyon (Area 2) Raw Score Weighted Score Raw Score Weighted Score Shay Meadow (Area 3) * Percolation rate may decrease during operational use due to movement of flow-entrained sedimentary particles into the voids of the vadose zone (possibly to 1/2 of test values). 1-Oct-04 Page 1 of 1

15 Big Bear Area Regional Wastewater Agency Geohydrologic Evaluation of Artificial Recharge Potential in the Big Bear Valley, California Table 2 Summary of Annual Evaporation Data Big Bear City Community Services District Weather Station Year Annual Pan Evaporation [inches] NA 1999 NA 2000 NA 2001 NA 2002 NA AVERAGE 42.4 Source: San Bernardino County Flood Control District. NA = Data not available 1-Oct-04 1 of 1