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Technical Memorandum TIN/TDS Study - Phase 2A of the Santa Ana Watershed Development of Groundwater Management Zones Estimation of Historical and Current TDS and Nitrogen Concentrations in Groundwater Final Technical Memorandum Prepared for the TIN/TDS Task Force July 2000 Wildermuth WE Environmental, Inc. TABLE OF CONTENTS 1. INTRODUCTION.......................................................................................................1-1 2. DATA SOURCES .......................................................................................................2-1 2.1 Data Request............................................................................................................................. 2-1 2.2 Other Data Sources................................................................................................................... 2-1 3. UPDATED BOUNDARY MAPS FOR MANAGEMENT ZONES ..................................................3-1 3.1 Objective................................................................................................................................... 3-1 3.2 Procedure.................................................................................................................................. 3-1 3.3 Development of Management Zone Boundaries ...................................................................... 3-3 3.3.1. San Bernardino Valley and Yucaipa/Beaumont Plains................................................................. 3-3 3.3.2. San Jacinto Basins ...................................................................................................................... 3-10 3.3.3. Chino – Rialto/Colton – Riverside Basins................................................................................... 3-23 3.3.4. Elsinore – Temescal Valleys........................................................................................................ 3-41 3.3.5. Orange County Basins ................................................................................................................ 3-49 4. REGIONAL TDS AND NITROGEN IN GROUNDWATER .......................................................4-1 4.1 Objective................................................................................................................................... 4-1 4.2 Procedure for Estimating Regional Water Quality................................................................... 4-1 4.2.1. Principal Changes to Original Procedure .................................................................................... 4-1 4.2.2. Procedure for Computing Regional Water Quality Used in this Study......................................... 4-2 4.3 Summary of Ambient Water Quality Statistics ........................................................................ 4-5 4.4 Estimation of Regional TDS and Nitrate Concentrations......................................................... 4-6 5. COMPUTE TDS AND NITROGEN CONCENTRATIONS FOR MANAGEMENT ZONES (1973 AND 1997)............................................................................................................5-1 5.1 Objective................................................................................................................................... 5-1 5.2 Procedure to Compute Ambient Concentrations (TDS and Nitrate) for Management Zones ........................................................................................................................................ 5-1 5.3 Details Related to Computation of Ambient Concentrations ................................................... 5-4 6. COMPLIANCE METRIC FOR THE SANTA ANA RIVER AT PRADO DAM ...................................6-1 6.1 Objective................................................................................................................................... 6-1 6.2 Existing August-Only Metric ................................................................................................... 6-1 6.3 Water Quality and Quantity at and Below Prado ..................................................................... 6-2 6.3.1. Surface Water at Below Prado...................................................................................................... 6-2 6.3.2. Groundwater Recharge................................................................................................................. 6-4 6.3.3. Fate of Recharge Water ................................................................................................................ 6-5 6.3.4. TDS and TIN in Groundwater....................................................................................................... 6-6 6.3.4.1 TDS at Wells...................................................................................................................................... 6-9 6.3.4.2 TIN at Wells..................................................................................................................................... 6-11 6.4 Conclusions ............................................................................................................................ 6-12 07/27/00 Final i Wildermuth Environmental, Inc. TIN/TDS STUDY PHASE 2A FINAL TECHNICAL MEMORANDUM 7. NITROGEN LOSS COEFFICIENT ....................................................................................7-1 7.1 Objective................................................................................................................................... 7-1 7.2 Definitions ................................................................................................................................ 7-1 7.3 Procedure.................................................................................................................................. 7-1 7.4 Nitrogen Losses in the Santa Ana River................................................................................... 7-2 7.4.1. Losing Reaches and Orange County Forebay............................................................................... 7-2 7.4.2. Nitrogen in the Santa Ana River and in Wells Under the Influence of the Santa Ana River ......... 7-2 7.5 Updated Data for RIX .............................................................................................................. 7-4 7.6 Nitrogen Loss Coefficients....................................................................................................... 7-4 8. REFERENCES ............................................................................................................8-1 APPENDIX A. COMPACT DISK (SEE NEXT PAGE FOR CONTENTS) APPENDIX B. COMMENTS AND RESPONSES APPENDIX C. DATA REQUEST LETTER AND ATTACHMENTS 07/27/00 Final ii Wildermuth Environmental, Inc. APPENDIX A. COMPACT DISK Folder Folder Contents File/Folder Name(s) File Type Adobe Acrobat Installation files for Adobe Acrobat Reader. AdobeWin3_1.exe for MS AdobeWin3_1.exe Program Windows 3.1 and AdobeWin95_98_NT.exe for MS Windows 95, MS AdobeWin95_98_NT.exe Program Windows 98, MS Windows NT. For other operating systems, download Adobe Acrobat Reader at: http://www.adobe.com/products/acrobat/readermain.html Aquifer Layers Layer geometry data for groundwater basins where multiple aquifers were BunkerHillPressure_Layer.exe ArcView Shapefiles (zipped) delineated; data used for volumetric analysis to determine ambient water Chino_Layer.exe Surfer Grid Files (zipped) quality within management zones. OrangeCounty_Layer.exe ArcInfo Export Files (zipped) Bottom of Bottom of the freshwater aquifer geometry data for groundwater basins BunkerHill_BoA.exe ArcView Shapefiles (zipped) Aquifer where a single aquifer was delineated; data used for volumetric analysis to ChinoRiverside_BoA.exe ArcView Shapefiles (zipped) determine ambient water quality within management zones. ElsinoreTemescal_BoA.exe ArcView Shapefiles (zipped) SanJacinto_BoA.exe Surfer Grid File (zipped) Boundaries Management zone and Basin Plan subbasin boundaries for the entire Mz_boundaries.exe ArcInfo Export File (zipped) watershed. BasinPlan_boundaries.exe ArcInfo Export File (zipped) Database Microsoft Access 2000 database containing water quality, water level, well tintds_db.exe MS Access database (zipped) information, and well construction data used in the delineation of management zone boundaries and the development of ambient water quality estimates. Fonts Fonts to load for map symbology. addfonts.exe True Type Fonts (zipped) GIS Coordinate File containing description of coordinate system parameters for all GIS Coord_sys_parameters.txt Text file System coverages included on the CD. Parameters Grid 400 m x 400 m grid used in ambient water quality computations. Grid.shp ArcInfo Export File (zipped) Land Use GIS land use coverages of Orange County for 1957 and of Chino Basin for Chino_Landuse.exe ArcView Shapefiles (zipped) 1949, 1957, 1963, 1975, 1984, and 1993. OCWD_Landuse.exe JPEG image (zipped) Other Map GIS coverages of other features shown on maps in this report (includes Geology.exe ArcView Shapefiles (zipped) Features surface geology, faults, groundwater divides, rivers, lakes, roads, recharge GW_divides.exe ArcView Shapefiles (zipped) facilities, wastewater ponds, and well coverages). Lakes.exe ArcView Shapefiles (zipped) Ocwd_forebay-pressure.exe ArcView Shapefiles (zipped) Ocwd_recharge.exe ArcView Shapefiles (zipped) Rivers.exe ArcView Shapefiles (zipped) Roads.exe ArcView Shapefiles (zipped) Sanjacinto_ww_ponds.exe ArcView Shapefiles (zipped) Wells_LosingReach.exe ArcView Shapefiles (zipped)
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