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toc

i
LETTER OF PERMISSION 2002-1
TABLE OF CONTENTS

1.0
INTRODUCTION
.....................................................................................................................1
1.1

Purpose of Letter of Permission Procedure
..............................................................................1
1.2

Impact of Endangered Species Act
..........................................................................................1
1.3

Role of CHERT
......................................................................................................................1
2.0
AUTHORIZATION FROM OTHER AGENCIES:
......................................................................2
2.1

State Water Quality Certification:
.............................................................................................2
2.2

Streambed Alteration Agreement
.............................................................................................2
2.3

Conditional Use Permit
............................................................................................................2
2.4

Coastal Development Permit
...................................................................................................2
3.0
PUBLIC AND AGENCY EVALUATIONS OF AUTHORIZED ACTIVITIES
..........................2
4.0
SCOPE OF WORK
....................................................................................................................3
5.0
LOCATION OF WORK:
...........................................................................................................3
6.0
EXTRACTION METHODOLOGIES, PRACTICES AND PROTOCOLS
...................................3
6.1

Excavation
.............................................................................................................................4
6.2

Storage of Excavated Material
.................................................................................................5
6.3

Modifications for Fisheries and Wildlife Habitat Improvement Projects
.......................................5
6.4

Haul Roads
............................................................................................................................5
6.5

Vegetation
..............................................................................................................................5
6.6

Structures and Buffers
............................................................................................................6
6.7

Grading
..................................................................................................................................6
6.8

Timing
....................................................................................................................................6
6.9

Stream Crossings for Gravel Mining Purposes
..........................................................................6
6.10

Listed Species Under The Federal ESA
...................................................................................6
7.0
APPLICATION AND EVALUATION PROCEDURES:
...........................................................7
8.0
SITE VISITS AND NOTIFICATIONS
.......................................................................................7
9.0
AUTHORIZATION
...................................................................................................................8
10.0
COMPLIANCE
.........................................................................................................................8
11.0
REQUIRED MITIGATION
.......................................................................................................8
12.0
DURATION OF THE LOP
........................................................................................................8
13.0
NEW PROJECTS
......................................................................................................................9
14.0
CONDITIONS OF THE LETTER OF PERMISSION
.................................................................9
15.0
COMMUNICATION WITH THE CORPS OR ENGINEERS
...................................................10
APPENDIX A - WILD AND SCENIC RIVER SECTIONS
..................................................................12
APPENDIX B CHERT* SURVEYING AND CROSS SECTION REQUIREMENTS
........................13
B-1 General Survey Requirements
.....................................................................................................13
B-2 Monitoring Cross Section Surveying Requirements
.......................................................................13
B-3 Extraction Cross-Section Surveying Requirements
........................................................................15
B-4 Bar Surface Profile Surveying Requirements
................................................................................16
B-5 Riffle Crest and Thalweg Profile Information
...............................................................................16
B-6 Preparation of Cross Sections and Profiles
...................................................................................16
ii
B-7
Additional Requirements for Monitoring Cross Sections
................................................................18
B-8 Additional Requirements for Extraction Cross Sections ..............................................................18
B-9 Preparation of Maps
...................................................................................................................19
APPENDIX C PRE AND POST EXTRACTION REPORTS
.............................................................21
C-1 Class A Projects
........................................................................................................................21
C-2 Class B Projects
.........................................................................................................................23
APPENDIX D GENERAL TIME LINE OF LOP ACTIVITIES
.........................................................25
APPENDIX E LIST OF LOP 02-1 GRAVEL EXTRACTION OPERATIONS
..................................27
APPENDIX F LIST OF ACCRONYMS
............................................................................................30
APPENDIX G LISTED SPECIES UNDER FEDERAL ESA
..............................................................31
G-1 U.S. FISH & WILDLIFE SERVICE
.........................................................................................31
G-2 NATIONAL MARINE FISHERIES SERVICE
..........................................................................33








1
U.S.A.C.E. 2002 Letter of Permission Procedure
Gravel Mining and Excavation Activities
Humboldt County, California
DRAFT 03/28/02

1.0
INTRODUCTION

1.1

P
URPOSE OF
L
ETTER OF
P
ERMISSION
P
ROCEDURE

The purpose of this Letter of Permission Procedure (LOP 02-1) is to provide a process for the U.S Army Corps
of Engineers (Corps) to authorize gravel mining and extraction activities in Humboldt County, California. These
authorizations are required under Section 404 of the Clean Water Act (CWA) and/or Section 10 of the Rivers and
Harbors Act of 1899.

The gravel industry is important to the economy of Humboldt County. However, instream gravel extraction has
the potential to produce multiple adverse impacts in riverine habitat and to impact other economic interests (Collins
& Dunne 1990; Laird, et al., 2000). This LOP procedure will streamline the process for authorizing gravel mining
and extraction activities in Humboldt County in manner that will minimize significant adverse individual and
cumulative impacts.

1.2 I
MPACT OF
E
NDANGERED
S
PECIES
A
CT

Gravel extraction in Humboldt County is cooperatively regulated by the Corps, Humboldt County Planning
Department (County), the California Department of Fish and Game (CDFG), and others. Because Endangered
Species Act (ESA) listed species and their habitats are present, the National Marine Fisheries Service (NMFS)
and the U.S. Fish and Wildlife Service (Service) are consulted.

Several species that utilize habitat associated with mining activities in Humboldt County have been listed under the
ESA. The Service has listed several species of birds as threatened under the ESA, including the Pacific coast
population of the western snowy plover (Charadrius alexandrinus nivosus), the northern spotted owl (Strix
occidentalis caurina), the bald eagle (Haliaeetus leucocephalus), and the marbled murrelet (Brachyramphus
marmoratus); this agency has also designated critical habitat for these species. The NMFS has listed and
designated critical habitat for Chinook salmon (Oncorhynchus tshawytscha), Coho salmon (Oncorhynchus
kisutch) and Steelhead trout (Oncorhynchus mykiss) within the project area. They w