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County of San Mateo the Promise of the Peninsula

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County of San Mateo the Promise of the Peninsula Midcoast Groundwater Study Phase II V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V Half Moon Bay V V V V V V V V V V V V V V V V V VV V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V County of San Mateo The Promise of the Peninsula SAN MATEO COUNTY MIDCOAST GROUNDWATER STUDY, PHASE II SAN MATEO COUNTY, CALIFORNIA January 8, 2007 (Revised October 2008) Copyright 2008 Kleinfelder All Rights Reserved Use or copying of this document is strictly prohibited by anyone other than the client for the specific project. 26848/4RPT (SJO8R430)/es TABLE OF CONTENTS 1.0 INTRODUCTION .................................................................................................. 1 1.1 PURPOSE AND SCOPE OF SERVICES .............................................................. 2 1.2 INVESTIGATIVE METHODS.............................................................................. 3 1.2.1 Report and Document Review ........................................................ 3 1.2.2 Data Management........................................................................... 4 1.2.3 Geographic Information System (GIS) ............................................ 4 2.0 GEOLOGIC SETTING.......................................................................................... 6 2.1 REGIONAL GEOLOGIC SETTING...................................................................... 6 2.1.1 Lithologic Units................................................................................ 7 2.1.2 Structure ......................................................................................... 7 2.2 MIDCOAST GEOLOGIC SETTING ..................................................................... 8 2.2.1 Midcoast Stratigraphy ..................................................................... 8 3.0 HYDROGEOLOGY ............................................................................................ 11 3.1 HYDROGEOLOGIC SETTING ......................................................................... 11 4.0 DESCRIPTION OF THE CONCEPTUAL-MODELING PARAMETERS............. 13 4.1 HYDROGEOLOGIC UNITS OF THE MIDCOAST STUDY AREA.............................. 13 4.2 PRELIMINARY EVALUATION OF AVAILABLE DATA............................................ 18 4.3 EVALUATION OF DEPTH TO WATER AND PUMPING RATE INFORMATION ........... 18 4.4 DISTANCE TO SURROUNDING WELLS SPREADSHEET ..................................... 19 5.0 FIELD DATA COLLECTION.............................................................................. 20 6.0 HYDROGEOLOGIC ANALYSIS ........................................................................ 22 6.1 PUMPING-TEST ANALYSIS ........................................................................... 22 6.1.1 Transmissivity ............................................................................... 24 6.1.2 Hydraulic Conductivity................................................................... 24 6.2 Pumping Tests .............................................................................. 25 6.3 Summary of Pumping Test Results............................................... 27 7.0 SUBAREA WATER-BALANCE ASSESSMENT ............................................... 29 7.1 METHODOLOGY OF THE HYDROGEOLOGIC ANALYSIS..................................... 29 7.1.1 Water-Balance Models.................................................................. 30 7.1.2 Calibration / Validation .................................................................. 32 7.1.3 Results .......................................................................................... 33 7.2 SUBBASIN ANALYSIS................................................................................... 34 7.2.1 El Granada Subbasin Water Balance............................................ 34 7.2.2 Arroyo de en Medio / Frenchmans Subbasins Water Balance...... 38 7.2.3 Airport SubArea Water Balance .................................................... 43 7.2.4 Moss Beach Subbasin Water Balance .......................................... 50 7.2.5 Montara Subbasin Water Balance................................................. 58 7.2.6 Portola Subarea Water Balance.................................................... 62 8.0 CONCLUSIONS................................................................................................. 65 8.1 EL GRANADA SUBBASIN.............................................................................. 65 8.2 ARROYO DE EN MEDIO / FRENCHMANSSUBBASINS ........................................ 66 26848/4RPT (SJO8R430)/es Page ii of iii October 2008 Copyright 2007 Kleinfelder 8.3 AIRPORT SUBBASIN .................................................................................... 67 8.4 MOSS BEACH SUBBASIN ............................................................................. 68 8.5 UPPER MOSS BEACH AND DEAN CREEK SUBAREAS ...................................... 69 8.6 MONTARA SUBBASIN .................................................................................. 70 8.7 PORTOLA SUBAREA.................................................................................... 71 8.8 MARTINI CREEK UPLAND SUBBASIN, WAGNER VALLEY SUBAREA, AND MONTARA CREEK UPPER AND LOWER SUBAREAS ................................................................... 72 9.0 RECOMMENDATIONS ...................................................................................... 74 10.0 LIMITATIONS..................................................................................................... 76 11.0 BIBLIOGRAPHY ................................................................................................ 78 Plates Plate 1 Project Area Map Plate 2 Regional Geologic Map Plate 3 Subbasins and Geologic Map Plate 4 Geologic Cross Sections Plate 5 Study Area Block Diagram Plate 6 Midcoast Subareas, Wells, Septic Tanks Plate 7 Developed and Undeveloped APNs Plate 8 Well-Depth and Depth to Water Frequency Distributions by Subarea (1) Plate 9 Well-Depth and Depth to Water Frequency Distributions by Subarea (2) Plate 10 Subareas Groundwater Elevation Monitoring, El Granada and Miramar Plate 11 Subareas Groundwater Elevation Monitoring, Airport and Moss Beach Plate 12 Subareas Groundwater Elevation Monitoring, Montara Plate 13 Pumping-Test Plots, Wells 1342 and 342 Plate 14 Pumping-Test Plots, Wells 163 and 1347 Plate 15 Precipitation Contour Map Plate 16 El Granada Subbasin Water Balance Plate 17 Arroyo de en Medio Subbasin Water Balance Plate 18 Moss Beach Subbasin Water Balance Plate 19 Montara Subbasin and Portola Subarea Water Balance Plate 20 Agricultural Lands by Water Source Appendix A Plate A-1 Geologic Time Scale Appendix B Distance to Surrounding Wells Spreadsheet Appendix C Supporting Spreadsheet Data 26848/4RPT (SJO8R430)/es Page iii of iii October 2008 Copyright 2007 Kleinfelder 1.0 INTRODUCTION The San Mateo Midcoast area is a scenic stretch of California coastline extending along US Highway 1 from north of Half Moon Bay in the south to north of the town of Montara (Project Area Map, Plate 1). The study area encompasses the communities of Montara, Moss Beach, Seal Cove, Princeton, El Granada, and Miramar. The land surface rises from the Pacific Ocean along wave-cut terraces, slopes gently upward to the east, then steepens along the granitic slopes of Montara Mountain. Surface topography is interrupted at several places in its assent upslope by geomorphic features created by tectonic (fault offset) and fluvial (stream erosion) processes. The lower, flatter portions of the Midcoast area consist predominately of marine terraces deposited during the last oceanic high-water stand during the Sangamon interglacial period of the Pleistocene Age (11,000 to 1.6 million years ago, see Geologic Time Scale, Appendix, Plate A-1). As the ocean has withdrawn from its higher elevations during Holocene time (the latest 11,000 years), streams flowing from the highlands of Montara Mountain have eroded narrow valleys into the mountain’s granite slopes and into the marine terrace deposits. The alluvium within the valleys and the terrace deposits generally consists of loose, unconsolidated, coarse- and medium-grained sand eroded from the granitic rocks of Montara Mountain. These sediments are the storage reservoirs for most groundwater in the Midcoast area. Most groundwater in the Midcoast area is derived from the alluvial and coastal terrace deposits and weathered granite that are recharged by rain falling on the coastal plains and in the mountains to the east. The San Mateo County Board of Supervisors has determined that because of the rapid growth within the Midcoast area of the county and the potential limited groundwater source in the area, a new comprehensive study of the hydrogeologic conditions of the area should be conducted. The Midcoast groundwater study was proposed to be conducted in phases. The Board contracted with Balance Hydrologics, Inc. to conduct the Phase I portion of the Midcoast Groundwater Study. The Phase I study consisted of a literature and data review (Balance, April 2002). 26848/4RPT (SJO8R430)/es Page 1 of 83 October 2008 Copyright 2007 Kleinfelder The purpose of Balance’s Phase I report was to provide a base-line list and review of publications, reports and other documents pertaining to the hydrogeologic conditions of the Midcoast area.
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