DOCSLIB.ORG

Geohydrology of a Deep-Aquifer Monitoring

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Geohydrology of a Deep-Aquifer Monitoring U.S. Department of the Interior U.S. Geological Survey � H A N S O N A � N D O T H E R S – A G T E O M H A Y R D I R N O A L , O M G O Y N O T F E A R E D Y E C E O P - U A N Q T U Y I , F C E R A Deep-Aquifer L M I O O Monitoring-Well F N O I R T Site N O I R A I N G Marina Coast - W Water District E L L S I T E GEOHYDROLOGY OF A DEEP-AQUIFER MONITORING-WELL SITE AT MARINA, W R I R 0 2 - 4 MONTEREY COUNTY, CALIFORNIA 0 0 3 Prepared in cooperation with MONTEREY COUNTY WATER RESOURCES AGENCY Water-Resources Investigations Report 02-4003 Base image for cover illustration provided courtesy of the Monterey Bay Aquarium Research Institute. Geohydrology of a Deep-Aquifer System Monitoring-Well Site at Marina, Monterey County, California By R.T. Hanson, Rhett R. Everett, Mark W. Newhouse, Steven M. Crawford, M. Isabel Pimentel, and Gregory A. Smith U.S. GEOLOGICAL SURVEY Water-Resources Investigations Report 02–4003 Prepared in cooperation with the Monterey County Water Resources Agency 4024-13 Sacramento, California 2002 U.S. DEPARTMENT OF THE INTERIOR GALE A. NORTON, Secretary U.S. GEOLOGICAL SURVEY Charles G. Groat, Director The use of firm, trade, and brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. For additional information write to: Copies of this report can be purchased from: District Chief U.S. Geological Survey U.S. Geological Survey Information Services Placer Hall, Suite 2012 Box 25286 6000 J Street Federal Center Sacramento, CA 95819-6129 Denver, CO 80225 CONTENTS Abstract.................................................................................................................................................................................. 1 Introduction ........................................................................................................................................................................... 2 Description of Study Area ........................................................................................................................................... 3 Land and Water Use..................................................................................................................................................... 3 Geohydrology of The Salinas Valley ........................................................................................................................... 3 Approach to Investigation............................................................................................................................................ 6 Acknowledgments ....................................................................................................................................................... 6 Geohydrologic Description of DMW1 .................................................................................................................................. 8 Geologic Data .............................................................................................................................................................. 8 Geophysical Data......................................................................................................................................................... 12 Paleontologic Data....................................................................................................................................................... 18 Hydrostratigraphy of DMW1 Site ............................................................................................................................... 18 Hydraulics.............................................................................................................................................................................. 20 Water-Level Measurements ......................................................................................................................................... 21 Hydraulic Properties .................................................................................................................................................... 21 Water Chemistry .................................................................................................................................................................... 22 Chemical Characteristics of Water from Monitoring and Supply Wells ..................................................................... 22 Source, Age, and Movement of Ground Water............................................................................................................ 23 Seawater Intrusion and Saline Ground Water.............................................................................................................. 25 Summary and Conclusions .................................................................................................................................................... 33 References Cited.................................................................................................................................................................... 34 Appendix 1: Cuttings and Core Descriptions for the DMW1 Monitoring Site..................................................................... 38 Appendix 2: Paleontologic Analyses for the DMW1 Monitoring Site.................................................................................. 65 Appendix 3: Water-Chemistry Data for the DMW1 Monitoring Wells and Core Pore Waters............................................. 69 FIGURES 1. Map showing location of deep-aquifer system monitoring-well site in the Salinas Valley, at Marina, California 4 2. Map showing location of deep-aquifer system monitoring-well site and selected water-supply wells, Marina, California ............................................................................................................................................................... 5 3. Schematic diagram showing well construction and lithology for the deep-aquifer system, Marina, California... 7 4. Photographs of cores 1 to 19 from the deep-aquifer system monitoring-well site, Marina, California ................ 9 5–13. Graphs showing: 5. Lithology and geophysical logs for the deep-aquifer system monitoring-well site, Marina, California....... 13 6. Acoustic and borehole inclinometer geophysical logs for the deep-aquifer system monitoring-well site, Marina, California ......................................................................................................................................... 14 7. Multi-spectral natural gamma geophysical logs for the deep-aquifer system monitoring-well site, Marina, California ......................................................................................................................................... 15 8. Geophysical logs for the deep-aquifer system monitoring-well site, Marina, California ............................. 17 9. Relation between chloride concentration and electromagnetic conductivity for core pore-water and well-water samples from the deep-aquifer system monitoring-well site, Marina, California ...................... 19 10. Trilinear diagram of major-ion chemistry for selected ground-water samples from the deep-aquifer system in the Salinas Valley, 1995, 1997, and 2000 with samples from DMW-1 wells, 2000...................... 24 11. Ratios of chloride-to-boron, chloride-to-iodide, and chloride-to-bromide plotted against chloride for ground-water and surface-water samples in the Salinas Valley, California................................................... 26 12. Deuterium and oxygen isotope values for selected ground-water and surface-water samples from the Salinas Valley, California............................................................................................................................... 29 13. Strontium-87/86 ratios plotted against strontium, and boron-11 plotted against chloride-to-boron ratios for selected wells in the Salinas Valley, California.............................................................................. 30 Contents III TABLES 1. Summary of well completion for the deep-aquifer system monitoring-well site, Marina, California...................... 8 2. Summary of slug-test estimates of hydraulic properties for the deep-aquifer system site, monitoring-well, Marina, California..................................................................................................................................................... 22 CONVERSION FACTORS, VERTICAL DATUM, WATER-QUALITY INFORMATION, ABBREVIATIONS, AND WELL- NUMBERING SYSTEM Multiply By To obtain inch (in.) 25.4 millimeter foot (ft) 0.3048 meter mile (mi) 1.609 kilometer square mile (mi2) 2.590 square kilometer acre-foot (acre-ft) 0.001233 cubic hectometer cubic foot per second (ft3/s) 0.02832 cubic meter per second foot per day (ft/d) 370.37037 millidarcy foot per day per foot (ft/d/ft) 1 meter per day per meter foot squared per day (ft2/d) 0.0929 meter squared per day gallon per minute (gal/min) 0.06308 liter per second Temperature is given in degrees Celsius (oC), which can be converted to degrees Fahrenheit (oF) by the following equation: oF = 1.8(oC) + 32. Vertical Datum Sea Level: In this report, “sea level” refers to the National Geodetic Vertical Datum of 1929 (NGVD of 1929)--a geodetic datum derived from general adjustments of the first-order level nets of both the United States and Canada, formerly called Sea Level Datum of 1929. Water-Quality Information
Load more

Recommended publications
  • Technical Report
    2350 Mission College Blvd., Suite 525 Santa Clara, CA 95054 650-852-2800 Storm Water Resource Plan For the Greater Salinas Area Final February 10, 2017 Prepared for Monterey Regional Water Pollution Control Agency 5 Harris Court, Building D Monterey, CA 93940 K/J Project No. 1668019*00 Table of Contents List of Tables ................................................................................................................................ iii List of Figures............................................................................................................................... iii List of Appendices ........................................................................................................................ iv List of Acronyms ........................................................................................................................... iv Section 1: Introduction and SWRP Objectives .............................................. 6 1.1 Plan Development .................................................................................. 6 1.1 SWRP Plan Objectives........................................................................... 8 1.1.1 GMC IRWM Plan Objectives ..................................................... 11 1.1.1.1 Basin Plan Goals Relevant to Storm Water ............ 11 1.1.2 Greater Salinas Area SWRP Objectives ................................... 11 1.1.2.1 Water Quality Objective .......................................... 12 1.1.2.2 Water Supply Objective .........................................
    [Show full text]
  • 20020906 Water Issues
    The Californian September 6, 2002 Section: Local Page: 3C Water Issues Divide Residents of Two Counties POLLY KENNEDY SPECIAL TO THE CALIFORNIAN There's a storm brewing in South Monterey County, but this one doesn't contain any water. Actually, a great part of it is about a lack of water. I have learned a couple of valuable lessons over the past decade: don't believe everything you hear, and there are always two sides to every story. These lessons were certainly proven true after a week-long vacation to Oak Shores at Lake Nacimiento with a family from Pacific Grove, which has become somewhat of a summer tradition. We paid for this home probably seven months ago, and it was at the end of July when, much to our chagrin, we heard (they in P.G. and we in King City) that the lake was dried up. I can tell you first-hand this rumor is false. The lake, according to a year-round resident Leslie of Oak Shores, hasn't been dry since the drought of 1990. She told us rumors have been escalating for years, because the lake is - and always has been - an agricultural reservoir and water is let out. The residents of Monterey County, she said, will vote on this issue in November. The lake is filled by rainwater only, and Monterey County uses the water to help keep the saltwater from intruding into the Salinas Valley. Adding to the problem is the lack of rain this past year. A year ago, 16 inches of the precious stuff was measured at Lake Nacimiento.
    [Show full text]
  • Forever Green Water Conservation Patch
    California is in the middle of a very serious drought and it is up to us, as stewards of our land, to make every effort to conserve water and help educate others to do the same! This patch program has been designed to educate the participants about water conservation, exploring your water footprint, how water is treated, water runoff, and to save money reducing unnecessary water usage. You will explore and investigate your local water district through printed materials and links found within this patch program. Learn how to test your local water source and compare results. Visit locally suggested water sources, water bodies, creeks, and beaches to gain a better understanding of your watershed. With guided instructions you’ll learn how to reach out to communities and help spread the word about water conservation. By reducing wasteful water practices you’ll save money on your water bill. Within this patch program, you’ll learn which county has a water rebate program for customers being proactive about water conservation. 1. Get to know your H2O! 1. Discover: Investigate your local water district online & through printed materials [Attachment A] • Santa Cruz Municipal Utilities Office (SCMU) o Santa Cruz County Water District Home Page o Santa Cruz County Water District Map • San Benito County Water District o San Benito County Water District Home Page o San Benito County Water District Map • Monterey Peninsula Water Management District o Monterey County Water Home Page o Monterey County Water District Map • San Luis Obispo County Water Resources o San Luis Obispo County Water Home Page o San Luis Obispo County Water District Map • Santa Barbara Public Works o Santa Barbara County Water District Home Page o Santa Barbara County Water District Map • Ventura Water o Ventura County Water District Home Page o Ventura County Water District Map 2.
    [Show full text]
  • May 2018 NEWSLETTER
    May 2018 NEWSLETTER NRWMAC’S PETITIONS of these uses as carrying any more or any less The Monterey County Water Resources weight than any other use. Yet it is now, and Agency (MCWRA) is releasing water from Lake always has been, the recreational component Nacimiento at an unprecedented rate. To that sufers due to MCWRA’s mismanagement. understand just how much water is being sent Although NRWMAC has been fghting to down the river, follow this link to the stream maintain the lake level at g48 feet above mean gauge monitor maintained by the United sea level (MSL), MCWRA is determined to States Geological Survey (USGS) at the base of lower it to g30 feet MSL, at which level lake the dam at Lake Nacimiento Reservoir: activity is adversely impacted. As a The full USGS website link - consequence, NRWMAC has retained a water https://waterdata.usgs.gov/ca/nwis/uv/t rights attorney to ejamine any and all legal site_no=11149400&PARAmeter_cd=00065,00 options to pursue against MCWRA, including 060 an immediate cessation of the massive and ( Alternate: https://tinyurl.com/yanggojj ) unreasonable water releases. NRWMAC is setting up a GoFundMe page to help fnance The data presented on the USGS website is attorney fees and will shortly announce when generally more reliable than that which and how donations can be made. MCWRA publishes on their website: http://www.co.monterey.ca.us/home/showdo RANGERS AND THE LAKE cumenttid=22189 With the water levels dropping it is more important than ever to bring Park Rangers back On April 26, 2018, NRWMAC served MCWRA to the lake in numbers sufficient to maintain with a petition, signed by 6,000 plus citiiens, center-line buoys and mark shallow water demanding the release be curtailed.
    [Show full text]
  • San Antonio and Nacimiento Rivers Watershed Management Plan
    San Antonio and Nacimiento Rivers Watershed Management Plan October 2008 Prepared by the Nacitone Watersheds Steering Committee and Central Coast Salmon Enhancement, Inc. Prepared for the Monterey County Water Resources Agency and the State Water Resources Control Board Funding for this project has been provided in full or in part through an agreement with the State Water Resources Control Board. The contents of this document do not necessarily reflect the views and policies of the State Water Resources Control Board, nor does mention of trade names or commercial products constitute endorsement or recommendations for use. (This page intentionally left blank) 2 Acknowledgements Facilitation of the Nacitone Watersheds Planning Process was managed by Traci Roberts of the Monterey County Farm Bureau. Stephnie Wald of Central Coast Salmon Enhancement prepared the watershed management plan with grateful assistance of Nicole Smith, Elise Torres, and Sarah Paddack. The preparation of the management plan was guided by Steering Committee Co-chairs Duane Wolgomott and Phil Humphrey. Ken Ekelund of the Monterey County Water Resources Agency managed the SWRCB grant that funded the Nacitone Watersheds Management Plan. Each member of the Steering Committee also contributed valuable information and assistance and is acknowledged below. Ann Beckett, Lockwood resident Marilyn Breland, Heritage Ranch resident Bill Capps, Nacimiento Regional Water Management Advisory Committee Terry Chavis, Heritage Ranch resident Ken Ekelund, Program Manager, Monterey County
    [Show full text]
  • Interlake Tunnel and Spillway Modification Projects
    Interlake Tunnel and Spillway Modification Projects April 16,2015 Pre‐proposal Meeting 1 Agenda • Welcome / Introductions • Pre‐proposal meeting instructions • Project Information – Tunnel Project Introduction – Spillway Modification Introduction – Reservoir simulation modeling results – Project schedule – Capital cost budget 2 Agenda (cont.) • RFP Requirements • Selection Criteria • Sample Contract Agreement – Compensation and payments • RFP 10531 Preliminary Engineering Scope of Work • RFP 10532 Environmental Compliance Scope of Work • Exhibit B –Technical References • Questions and Answers 3 Introductions Project Owner Program Management EPC Consultants, Inc Conceptual Engineering 4 PROJECT BACKGROUND, DESCRIPTION AND FUNCTION 5 Bob Antle • Project champion • Representing agriculture in Salinas Valley • Desired tunnel to be built: As fast As cheap As soon as possible • Sought alternative means to conventional public project process. Project team is honoring Bob’s legacy. 6 Existing Surface Water Supply for Salinas Valley properties 2 reservoirs, Salinas River, and Salinas River Diversion Facility Description Average SRDF Annual Amounts Salinas (AFY) San Antonio River Average annual 200,000 controlled release from reservoirs Nacimiento (baseline) Less ‐40,000 Evapotranspiration & Conveyance losses SRDF deliveries ‐6,000 Ground water 154,000 recharge Provides flood control, minimum flows, and conservation releases 7 Tunnel has 37 year history from 1978 8 1991 Analysis 9 1991 tunnel studies 10 Reservoirs Features San Antonio Max Capacity
    [Show full text]
  • January 2020 NEWSLETTER NRWMAC VS MONTEREY COUNTY Habitat
    Current Lake Level – 762 ft ( 60% ) Current Daily Release – 60 cfs January 2020 NEWSLETTER NRWMAC VS MONTEREY COUNTY habitat. However, NRWMAC's 6500 constituents also have rights to the use of this water, and for It has been one year since the Nacimiento over 25 years NRWMAC has fought, and Regional Water Management Advisory continues to fight, to ensure that these rights Committee ("NRWMAC") filed its lawsuit against are recognized and honored.2 the County of Monterey, and other agencies in that county, each of which has some In the current litigation, NRWMAC has been responsibility for managing Lake Nacimiento. Or 1 involved in a lengthy and continuing negotiation rather, mismanaging it. The lawsuit alleges that process with Monterey County over what the the various agencies named as defendants (for lake level should be. (To allow for settlement the sake of brevity, all are referred to herein as discussions to proceed while keeping litigation "Monterey County") have, among other things, costs to a minimum, the parties agreed to stay failed their obligations to operate the lake in the court action.) Although the specific details of such manner as to provide sufficient water the talks are shielded by a confidentiality levels for recreation. When the level becomes agreement, in general terms they concern the too low, docks and launch ramps become level at which the lake should be maintained unusable and navigational hazards emerge from from April through Labor Day each year. under water. This happens entirely too often in NRWMAC asserts that the water in the lake the peak summer months, causing harm, must be maintained during these months at 750 financial and otherwise, to the community of feet above mean sea level (msl), with residents, businesses and lake enthusiasts who adjustments made for drought years.
    [Show full text]
  • By William E. Templin and Randall C. Schluter Sacramento, California 1990
    A WATER-RESOURCES DATA-NETWORK EVALUATION FOR MONTEREY COUNTY, CALIFORNIA, PHASE 3: NORTHERN SALINAS RIVER DRAINAGE BASIN By William E. Templin and Randall C. Schluter U.S. GEOLOGICAL SURVEY Water-Resources Investigations Report 89-4123 Prepared in cooperation with the MONTEREY COUNTY FLOOD CONTROL AND WATER CONSERVATION DISTRICT CM iH I CO O o Sacramento, California 1990 DEPARTMENT OF THE INTERIOR MANUEL LUJAN, JR., Secretary U.S. GEOLOGICAL SURVEY Dallas L. Peck, Director For additional information write to: Copies of this report may be purchased from: District Chief U.S. Geological Survey U.S. Geological Survey Books and Open-File Reports Section Federal Building, Room W-2234 Box 25425 2800 Cottage Way Building 810, Federal Center Sacramento, CA 95825 Denver, CO 80225 CONTENTS Page Abstract .................................................................. 1 Introduction .............................................................. 2 Purpose, scope, and objectives ....................................... 2 Approach ............................................................. 6 Location of study area ............................................... 6 Limitations .......................................................... 7 Acknowledgments ...................................................... 7 Well-numbering system ................................................ 8 Climate ................................................................... 9 Land use .................................................................. 10 Water use ................................................................
    [Show full text]
  • Lake San an Toni'o 35 ,; 48'' N / 120" 54' N San Luis Obispo County Monterey County
    This document is a collection of Scooper Water Body Coordination Worksheets of Lakes and Reservoirs that are adjacent to Los Padres National Forest. These worksheets are and shall be updated annually by May 1. The information herein will be distributed to Los Padres Emergency Communication Center and to the Southern California Geographic Coordination Center. This document complies with the current Amphibious Water Scooper Aircraft Operations Plan 2016 as outlined in Appendix B, C, and D. https://gacc.nifc.gov/nrcc/dispatch/aviation/ApprovedScooperOpsPlan.pdf Appendix C – Water Body Selection Process A key element in operations is to thoroughly analyze the considerations involved in deciding which bodies of water to use in water scooping operations. Being able to do this analysis prior to the need to use scoopers is essential. Local units are responsible for completing a “Scooper Water Body Coordination Worksheet” (appendix B) for each body of water that may be used for water- scooping operations. The Process Upon receiving a dispatch to a wildfire, the dispatcher will determine the closest two bodies of water to the incident. The primary body of water contacts will be notified if required; if the AWSA has been dispatched to a wildfire, request confirmation of permission for use of the body of water. The final decision regarding safe utilization of a body of water will rest with the Water Scooper Pilot-in-command. The authorities for the body of water used will be notified when scooping operations cease. Standard Nomenclature for Body of Water Notification The following standard arrangement will be used for body of water notification and a callback phone number will be provided to the body of water authority with each request: • This is (first and last name) from the U.S.
    [Show full text]
  • Nitrate Fate and Transport in the Salinas Valley
    LLNL‐TR‐484186 LAWRENCE LIVERMORE NATIONAL LABORATORY California GAMA Special Study: Nitrate Fate and Transport in the Salinas Valley Jean E. Moran*, Bradley K. Esser, Darren Hillegonds, Marianne Holtz*, Sarah K. Roberts, Michael J. Singleton, and Ate Visser Lawrence Livermore National Laboratory *California State University, East Bay March, 2011 Final Report for the California State Water Resources Control Board GAMA Special Studies Task 10.5: Surface water-groundwater interaction and nitrate in Central Coast streams Disclaimer This document was prepared as an account of work sponsored by an agency of the United States government. Neither the United States government nor Lawrence Livermore National Security, LLC, nor any of their employees makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States government or Lawrence Livermore National Security, LLC. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States government or Lawrence Livermore National Security, LLC, and shall not be used for advertising or product endorsement purposes. Auspices Statement This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE‐AC52‐07NA27344. GAMA: AMBIENT GROUNDWATER MONITORING & ASSESSMENT PROGRAM SPECIAL STUDY California GAMA Special Study: Nitrate Fate and Transport in the Salinas Valley Jean E.
    [Show full text]
  • 05 Section B Region Description
    GREATER MONTEREY COUNTY INTEGRATED REGIONAL WATER MANAGEMENT PLAN Region Description Section B: Greater Monterey County Region Description B.1 REGIONAL BOUNDARY B.1.1 Description of Greater Monterey County IRWM Regional Boundary and its Relation to Neighboring Regions The Greater Monterey County Integrated Regional Water Management (IRWM) region includes the entirety of Monterey County exclusive of the Pajaro River Watershed IRWM region and the Monterey Peninsula, Carmel Bay, and South Monterey Bay IRWM region established under Proposition 50. The Greater Monterey County IRWM region also includes a small portion of San Benito County where the Salinas River watershed extends outside of Monterey County. Generally, the region includes the entire Salinas River watershed north of the San Luis Obispo County line, all of the Gabilan and Bolsa Nueva watersheds in the northern part of the county, and all of the coastal watersheds of the Big Sur coastal region within Monterey County. Areas within Monterey County that are not represented in this IRWM Plan (but that are represented in other IRWM Plans) include: the Pajaro River watershed, represented in the Pajaro River Watershed IRWM Plan; and the Carmel River watershed, the San Jose Creek watershed, areas overlying the Seaside Groundwater Basin, and all areas within the Monterey Peninsula Water Management District jurisdictional boundary (including the Monterey Peninsula cities of Carmel-by-the-Sea, Del Rey Oaks, Pacific Grove, Monterey, Sand City, and Seaside), which are represented in the Monterey Peninsula, Carmel Bay, and South Monterey Bay IRWM Plan. The Greater Monterey County IRWM region lies entirely within the Central Coast Regional Water Quality Control Board (RWQCB) district and is part of the IRWM Central Coast Funding Area.
    [Show full text]
  • South-Central California Coast Steelhead Recovery Planning Area
    SOUTH-CENTRAL CALIFORNIA COAST STEELHEAD RECOVERY PLANNING AREA CONSERVATION ACTION PLANNING (CAP) WORKBOOKS THREATS ASSESSMENT Little Sur River estuary, Monterey County Prepared for: Prepared by: NOAA-NMFS Hunt & Associates Biological Southwest Region Consulting Services 735 State Street, Suite 616 5290 Overpass Rd., Suite 108 2008 Contact: Mark H. Capelli Contact: Lawrence E. Hunt Recovery Coordinator Consulting Biologist (805) 963-6478 (805) 967-8512 South-Central California Coast Steelhead Recovery Planning Area South-Central California Coast Recovery Planning Area Steelhead Threats Assessment Methodology Introduction. The Department of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service (NMFS) contracted with Hunt & Associates Biological Consulting Services to provide technical support in developing Recovery Plans for steelhead (Oncorhynchus mykiss) populations in the South-Central California Coast Steelhead Recovery Planning Area and the Southern California Coast Steelhead Recovery Planning Area. Specifically, Hunt & Associates was tasked with reviewing existing information on steelhead habitat conditions, assessing the magnitude and extent of threats to steelhead and their habitats, and developing recovery actions across these two Steelhead Recovery Planning Areas. This document summarizes the results of an assessment of threats and sources of threats to steelhead in the South-Central California Coast Steelhead Recovery Planning Area, which includes coastal steelhead populations from the Pajaro River watershed of Monterey County southward to the Arroyo Grande Creek watershed in southern San Luis Obispo County, California. Recovery action matrices for each watershed in both Steelhead Recovery Planning Areas are provided in separate documents. Methods. Twenty-two coastal watersheds, encompassing 27 drainages, were selected for threats assessment analysis and recovery planning actions in this Steelhead Recovery Planning Area (see Table 1 in Threats Assessment Summary section).
    [Show full text]