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Chehalis Best Management Practices Evaluation Project

Final Report for Water Quality Sites

April 2002

Publication No. 02-03-015 printed on recycled paper

This report is available on the Department of Ecology home page on the World Wide Web at http://www.ecy.wa.gov/biblio/0203015.html For additional copies of this publication, please contact: Department of Ecology Publications Distributions Office

Address: PO Box 47600, Olympia WA 98504-7600 E-mail: ecypub@ecy.wa.gov Phone: (360) 407-7472

Refer to Publication Number 02-03-015

The Department of Ecology is an equal opportunity agency and does not discriminate on the basis of race, creed, color, disability, age, religion, national origin, sex, marital status, disabled veteran's status, Vietnam era veteran's status, or sexual orientation. If you have special accommodation needs or require this document in alternative format, please contact Joan LeTourneau, Environmental Assessment Program, at (360)-407-6764 (voice). Ecology's telecommunications device for the deaf (TDD) number at Ecology Headquarters is (360) 407-6006.

Chehalis Best Management Practices

Evaluation Project

Final Report for Water Quality Sites

by Debby Sargeant, Sarah O'Neal, and William Ehinger

Environmental Assessment Program Olympia, Washington 98504-7710

April 2002

Waterbody Numbers: WA-23-1027, WA-23-1028, WA-23-1104, WA-23-2020

Publication No. 02-03-015

printed on recycled paper

Page i

Table of Contents

Page

List of Appendices .............................................................................................................. ii

List of Figures .................................................................................................................... iii

List of Tables...................................................................................................................... iv

Abstract ............................................................................................................................... v

Acknowledgements ............................................................................................................ vi

Introduction ......................................................................................................................... 1

Water Quality Standards ..................................................................................................... 3

Quality Assurance and Quality Control Results ................................................................. 4

Methods............................................................................................................................... 5 Sample Collection ......................................................................................................... 5 Sample Timing .............................................................................................................. 6 Sample Period and Parameters...................................................................................... 6 Data Analysis .............................................................................................................. 10

Results ............................................................................................................................... 13 1. Beaver Creek and Allen Creek BMP Evaluation ................................................... 13

Site Description................................................................................................... 13 Historical Data .................................................................................................... 13 Best Management Practices ................................................................................ 14 Water Quality Results ......................................................................................... 15 Discussion........................................................................................................... 23 Conclusions and Recommendations ................................................................... 24

2. Bunker Creek and Deep Creek BMP Evaluation ................................................... 25 Site Description................................................................................................... 25 Historical Data .................................................................................................... 26 Best Management Practices ................................................................................ 26 Water Quality Results ......................................................................................... 27 Discussion........................................................................................................... 31 Conclusions and Recommendations ................................................................... 32

3. Berwick Creek and Dillenbaugh Creek BMP Evaluation...................................... 33 Site Description................................................................................................... 33 Historical Data .................................................................................................... 34 Best Management Practices ................................................................................ 34 Water Quality Results ......................................................................................... 35 Discussion........................................................................................................... 42 Conclusions and Recommendations ................................................................... 43

Summary Conclusions and Recommendations ................................................................. 45

References ......................................................................................................................... 47

Page ii

List of Appendices A. Abstracts from Chehalis Best Management Practices Evaluation Project Reports

B. Quality Assurance and Quality Control C. Data Qualifiers

D. Previous Rainfall for Sample Events.

E. Beaver Creek and Allen Creek Field Data, 1994-99 Laboratory Data, 1994-99

F. Bunker Creek and Deep Creek Field Data, 1994-99 Laboratory Data, 1994-99

G. Berwick Creek and Dillenbaugh Creek Field Data, 1998-2000 Laboratory Data, 1998-2000

Page iii

List of Figures

Page

Figure 1. Sampling sites for Beaver Creek and Allen Creek ........................................... 14

Figure 2. Average wet season fecal coliform loading contributions to Beaver Creek, 1994-99 ............................................................................................................ 19

Figure 3. Average wet season fecal coliform loading for Beaver Creek (mouth) ........... 20

Figure 4. Fecal coliform loading for Beaver Creek and Allen Creek, 1995-99............... 21

Figure 5. Ammonia-nitrogen loading for Beaver Creek and Allen Creek, 1995-99........ 21

Figure 6. Nitrate-nitrite nitrogen concentrations for Beaver Creek and Allen Creek, 1995-99............................................................................................................. 22

Figure 7. Total persulfate nitrogen concentrations for Beaver Creek and Allen Creek, 1995-99............................................................................................................. 23

Figure 8. Sampling sites for Bunker Creek and Deep Creek ........................................... 25

Figure 9. Average dry season ammonia-nitrogen loading for Bunker Creek and Deep Creek, 1994-99 ........................................................................................ 30

Figure 10. Dry season fecal coliform levels for Deep Creek ........................................... 31

Figure 11. Sampling sites for Berwick Creek and Dillenbaugh Creek ............................ 33

Figure 12. Dissolved oxygen average percent saturation by site for Berwick Creek and Dillenbaugh Creek, 1999-2000................................................................ 37

Figure 13. Wet season average fecal coliform loading for Berwick Creek and Dillenbaugh Creek, 1998-2000....................................................................... 41

Figure 14. Dry season average fecal coliform loading for Berwick Creek and Dillenbaugh Creek, 1999-2000....................................................................... 41

Figure 15. Dry season fecal coliform results between CM 0.6 and CM 0.0 for Berwick Creek, 1999-2000............................................................................. 42

Page iv

List of Tables

Page

Table 1. Beaver and Allen creeks sampling period, field measurements, and laboratory parameters for each site...................................................................... 7

Table 2. Bunker and Deep creeks sampling period, field measurements, and laboratory parameters for each site...................................................................... 8

Table 3. Berwick and Dillenbaugh creeks sampling period, field measurements, and laboratory parameters for each site...................................................................... 9

Table 4. Beaver Creek and Allen Creek sites not meeting pH or dissolved oxygen water quality standards .......................................