Developing Water Quality Objectives in BC: A User's Guide
Contents
1. Glossary Summary of the entire assessment Preface Purpose of Water Quality Objectives How Water Quality Objectives are E How Water Quality Objectives are used Objectives and Monitoring Introduction Water Body Profile Hydrology Water Uses Point and Non point Sources Water Quality Assessment and Objectives Water Quality Assessment Water Quality Objectives Monitoring Recommendations Note that certain sections contained within the Preface and Introduction are generic in nature e g How Water Quality Objectives are determined and How Water Quality Objectives are used etc These are boiler plate statements which can be transferred from one Water Quality Objectives document to another http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 6 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide without changes We have prepared a comprehensive Glossary which can also be transferred to and subsequently amended by writers of Water Quality Objectives in Region Return to Water Quality Assessment The Introduction This chapter is usually fairly short about two to three pages and provides an introduction to e the need for development of Water Quality Objectives for a given water body e the process of establishing water quality objectives in BC e the general area to be described in the assessment report Include a general description of the watershed and ecosyste2. project proponents and contractors the key requirements for preparing water quality assessment and objectives documents We outline the key information which should be included on hydrology limnology and or oceanography water uses permitted waste discharges non point sources and ambient water quality We present examples of different types of tables and figures to use We also present the rationale for proposing Water Quality Objectives based directly on Water Quality Criteria We include the reasoning as to the types of situations where more detailed justification may be required to propose a Water Quality Objective Finally we outline the administrative procedure to formalize the proposed Water Quality Objective as Ministry policy Return to the Table of Contents Acknowledgements This User s Guide represents the culmination of a ten year evolutionary process for the development of Water Quality Objectives and Criteria in British Columbia begun in the early 1980 s During most of that decade this process was spearheaded in the Ministry of Environment Lands and Parks Water Land and Air Protection by three individuals the late Dr Ron Buchanan and Messrs Roland Rocchini and Larry Pommen These individuals did not act alone but were supported by numerous technical staff who themselves developed many of the concepts put forth in this User s Guide As well during that time period the draft documents were reviewed by countless in
3. 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide The Water Quality Assessment A Water Quality Assessment and Objectives report consists of two parts 1 an Overview previously known as the short report which summarizes the findings of the Technical Report and is mainly written for the Ministry Executive and the public 2 the Technical Report previously known as the Technical Appendix The Overview is published both as a stand alone document as well as jointly with the Technical Report Both the Overview and the Technical Report include sections chapters on proposed Water Quality Objectives and a monitoring program Outline of Assessment Document The Overview The Introduction Hydrology Limnology and or Oceanography Water Uses Permitted Discharges Non point Sources e Ambient Water Quality and Proposed Water Quality Objectives e Proposed Water Quality Monitoring Program References Figures Tables Appendices Outline of Assessment Document http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 4 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide A general outline for an assessment document is given below More details on each major report division follow in the latter sections of this chapter The document will usually consist of the following in the order listed 1 Overview Report included at front of
4. Methods for Deriving Site Specific Water Quality Objectives in British http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 15 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide Columbia and Yukon For all situations situations apply sound logic and convey this logic to the reader of the Technical Report This gives the Water Quality Objective proposed strong support This may mean for example putting a short one page justification into the Technical Report If more detail is required place it into an Appendix to the Technical Report Return to Water Quality Assessment Proposed Water Quality Monitoring Program Propose a water quality monitoring program that will allow you to check the attainment of the Water Quality Objectives in the future Indicate in the water quality monitoring program site locations frequency of monitoring variables to be monitored sampling period Locate sites close to the edge of the initial dilution Zone s of discharges where you suspect that the Objectives would likely be exceeded Determine the frequency of sampling to a large degree from the quality quantity of data required to satisfy the Objectives themselves Also make allowance for the type of statistic required e g maximum mean median 90th percentile which in itself defines a minimum frequency e g mean of a minimum of five times in a 30 day period separated in time by a w
5. water body used by humans the timing of this use and the purpose of the recreational use With information provided on http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 7 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide aquatic life use include e species local Fisheries Branch staff of Ministry of Environment and their numbers return numbers over different decades is beneficial in terms of salmon escapements obtained from Department of Fisheries and Oceans e areas of the water body used by fish or shellfish the timing of this use and the purpose of the use e g Spawning rearing migration e physical constraints to the use of the water body by fish or shellfish and the monetary value of the fishery if available presence of rare or endangered species The information on use by fish such as salmon should be obtained from staff of the Department of Fisheries and Oceans or data reports published by that Department For resident fish species Fisheries Branch staff of the Ministry of Environment are appropriate contacts Note the locations of licensed water withdrawals on a map and tabulate information related to the type of withdrawal licence number and associated volumes for each type of withdrawal see table below licences Domestic Industrial Note constraints which may exist to some use such as climate no soil available on which to grow cro
6. Developing Water Quality Objectives in BC A User s Guide a Ministry Home Government of British Columbia Environmental Protection Division ewinistry of 3 The Minister News Search Reports amp Publications Contacts Water Air and Climate Change Branch WATER QUALITY Developing Water Quality Objectives in British Columbia A User s Guide February 1996 Table of Contents SUMMARY ACKNOWLEDGEMENTS INTRODUCTION THE WATER QUALITY ASSESSMENT o Outline of Assessment Document o The Overview o The Introduction o Hydrology Limnology and or Oceanography o Water Uses o Permitted Discharges o Non point Sources o Ambient Water Quality and Proposed Water Quality Objectives o Proposed Water Quality Monitoring Program o References o Figures o Tables o Appendices ADMINISTRATIVE PROCEDURES http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 1 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide REFERENCES APPENDICES oO Appendix 1 Style Guide for Water Quality Objectives Reports O Appendix 2 Title Page for the Overview Report O Appendix 3 Common Water Quality Objectives KA Appendix 4 Example of a Monitoring Table O Appendix 5 Example of Summary Table from Overview Report Summary We summarize in this report for BC Ministry of Environment now called Water Land and Air Protection staff
7. Provincial Water Quality Criteria for a variable of concern in relation to the water uses designated for protection i e designated water uses A table showing some examples of Water Quality Objectives for different combinations of designated water uses is shown below while a more comprehensive table is included as Appendix 3 The tables are based upon British Columbia Water Quality Guidelines Criteria 1998 Edition which is updated periodically Develop Water Quality Objectives for other variables or where there is a different combination of designated water uses using appropriate criteria from the current edition of British Columbia Water Quality Guidelines Criteria 1998 Edition available from the Water Quality Branch Victoria Common Water Quality Objectives for Different Water Uses Applicable Water Uses for the Water Body Column 1 ae a Column 3 ae Column 5 Wildlife and Column 2 Column 4 Freshwater pus plus pius plus Aquatic Life prnking Irrigation Livestock Recreation q Water g Watering Variable residual 100 ug L max 2 ug L mean continuous exposure chlorine 1074 minutes exposure 2 74 mean controlled intermittent exposure hl h i See Tables 26 and 27 in CMEIE PRENOS British Columbia Water Quality Guidelines Criteria 1998 Edition fecal coliforms none 0 with no treatment 10 90th percentile disinfection only Escherichia coli 100 90th percentile partial treatment Proposing Water Quality Obj
8. Technical Report and stand alone including cover page with formal sign off by Ministry Executive 2 Technical Report e Title Page Water Quality Assessment and Objectives for followed by the author s name and affiliation and date of endorsement of the Water Quality Objectives as Ministry policy e Table of Contents List of Tables List of Figures Acknowledgments Chapter 1 Introduction e Chapter 2 Hydrology Limnology and or Oceanography as appropriate e Chapter 3 Water Uses Chapter 4 Permitted Discharges Chapter 5 Non Point Sources Chapter 6 Ambient Water Quality Assessment and Proposed Water Quality Objectives Chapter 7 Proposed Water Quality Monitoring ae References i Figures Tables Appendices Return to Water Quality Assessment http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 5 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide The Overview The Overview is published both as a separate document and with the Technical Report It has a one page summary of the entire assessment as well as individual summaries for each chapter Include a simple glossary of terms The Assistant Deputy Minister of Regions and the Executive Director of the Environmental Protection Department sign the cover page indicating that the water quality objectives have been formally approved Arrange the Overview in the manner shown below Title Page see Appendix 2
9. dividuals from http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 2 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide Environment Canada and Department of Fisheries and Oceans as well as Ministry staff in regions and Victoria The User s Guide itself has been reviewed by many individuals from the Water Quality Branch including Drs Rick Nordin and Narender Nagpal and Messrs Prad Khare Larry Pommen Roland Rocchini Bob Nijman and Ron Hall Ms Jennifer Nener from the Department of Fisheries and Oceans provided valuable review comments from a non Ministry perspective To these people we express our gratitude To those individuals who follow we pass the torch and wish them well Return to the Table of Contents Introduction The Ministry of Environment Lands and Parks Water Land and Air Protection is responsible for protection and management of the water quality of all fresh estuarine and marine waters in the Province of British Columbia In an aquatic environment water quality refers to the quality of the entire aquatic ecosystem the water the bottom and suspended sediments and the biological organisms inhabiting the water and sediment We manage water quality through a process that begins with a detailed assessment of a water body and culminates in the development of site specific Water Quality Objectives If attained these Objectives will protect the most s
10. ectives for Atypical Situations http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 14 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide There are times when the water quality criteria as specified in the current edition of the British Columbia Water Quality Guidelines Criteria 1998 Edition cannot be used directly as Water Quality Objectives for various reasons Naturally Higher Levels An example would be a certain metal in a water body that occur at levels at a naturally higher level than the criterion In such situations we usually decide that as long as there is no change from background concentrations no harmful effects should take place We define the term no change as a difference of not greater than 20 going from upstream to downstream from a discharge or series of discharges We rationalize the 20 increase this percentage can be reduced in situations where replicate sampling has been carried out with the monitoring program as not being an increase since e the precision for measurement of low concentration metals in replicate samples is not usually better than 20 in ideal situations in a laboratory e natural variability is often greater than 20 We have used this approach in many published water quality assessments Another approach which we have used when there were enough data has been to base the Water Quality Objective on the historical background l
11. eekly interval Determine the period of sampling during the year should be determined from e the time during the year when the objective applies e g recreation season e the time s during the year when the objective is likely to be exceeded An example table outlining monitoring which should be included in the Technical Report and in the Overview report is shown in Appendix 4 A quality assurance component should be noted as being required for the monitoring program The details of the program will vary however it should include submission of blanks replicates and standard reference materials Return to Water Quality Assessment http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 16 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide References Traditionally we referenced information in the Technical Report using the number notation system 123 Equally acceptable is the use of the author date notation method Swain 1994 Regardless of the notation used apply it consistently throughout the Technical Report and document these references fully in a section of the report immediately following the text We do not normally cite references in the Overview report Figures Use Figures with appropriate scales 1 50 000 is common within the Technical Report to document the location of the watershed within British Columbia and site locations within watersheds of anythi
12. ensitive water use designated for the water body Water uses which can be designated for protection are drinking water recreation irrigation protection for wildlife livestock watering and aquatic life This manual is meant to provide the Ministry Regions with a simplified outline of the requirements for developing Water Quality Objectives in British Columbia Specifically it is intended for use by Ministry staff consultants and others who will be performing water quality assessments with the goal of proposing objectives for a water basin More detailed documents available to the interested reader and used to derive this manual are the Principles For Preparing Water Quality Objectives in British Columbia Ministry of Environment and Parks 1986 and the Guide to the Environmental Assessment of Mine Development Proposals In British Columbia Ministry of Environment Lands and Parks 1994 As well the Ministry has prepared about 40 reports since about 1985 which can be examined We have organized this guide by task as would be found in the subject documents to be produced We include information on the recommended report style such as font or page format see Appendix 1 We also include an Administrative Procedure for formalizing the establishment of the proposed Water Quality Objectives as Ministry policy Return to the Table of Contents http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 3 of 19 2006 01 17
13. er of weeks over which the accumulated wastes might be released Assumptions which we might make and which should be stated as such in the Technical Report include all the wastes generated over the period reach the water body e all the wastes accumulated over a certain time period are transported to the water body e flows in the water body are consistent throughout the release period ween Te fe Ts 4 P Phosphorus mg L N Nitrogen mg L Impacts from Storm Water Discharges You may often be able to estimate loadings from storm water discharges using existing studies undertaken in BC extrapolating actual loadings to the area of interest Below is an example presenting the final results for this type of information for an assessment report Estimated Loadings kg d Estimated Increases mg L Variable Prince George Quesnel Prince George Quesnel suspended solids 578 1 o 8s o o 0 009 http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 11 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide total nitrogen 0 004 0 0007 total phosphorus 0 0005 0 0001 Often calculations should be based on worst case loadings which reflect maximum quantities of contaminants after a period of dry weather when these have accumulated Return to Water Quality Assessment Ambient Water Quality and Proposed Water Quality Objectives Some individuals may prefer to develo
14. ess We stress that even in these types of situations the Water Quality Objectives should be put through the formal review process so that these can be treated equally with other Water Quality Objectives for the purpose of obtaining funding for monitoring You should understand that without sign off the Objectives will not be formal Ministry policy Return to the Table of Contents References e Bangay G E 1976 Livestock and Poultry Wastes in the Great Lakes Basin Environmental Concerns and Management Issues Social Science Series No 15 Inland Waters Directorate Ontario Region Burlington Ontario e British Columbia Ministry of Environment and Parks 1986 Principles For Preparing Water Quality Objectives in British Columbia September 1986 20 pp e British Columbia Ministry of Environment Lands and Parks 1994 Approved and Working Criteria for Water Quality 1994 February 1994 44 pp e British Columbia Ministry of Environment Lands and Parks 1994 Guide to the Environmental Assessment of Mine Development Proposals In British Columbia Draft 4 July 20 1994 29 pp Return to the Table of Contents gt gt Appendices Top Copyright Disclaimer Privacy Feedback http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 19 of 19 2006 01 17 3 01 49 PM
15. evels allowing little or no change from one or more of the historical statistics Characteristics with no Published Criteria In other situations we may need to develop Objectives for variables for which there are no published criteria In one approach we compared data from uncontaminated areas background to those from more populated or contaminated areas We then used literature values to determine what concentrations may cause an adverse effect and developed a number which protected the given water body We developed sediment quality objectives for Burrard Inlet on this basis Challenging Existing Criteria In very rare situations you may find that criteria from other jurisdictions are overly restrictive at first examination You may need a detailed investigation to examine the literature and justify preparing a new criteria document In some very sensitive environments we have found that we have had to develop an Objective which was more restrictive than the Criterion We did this for a number of areas where we were using the Canadian Council of Ministers of the Environment criteria for dissolved oxygen Another approach which has been rarely used because of cost is to do site specific studies such as modeling e g metals speciation bioassays or population studies etc to derive an Objective which better reflects local water quality conditions This approach would likely only be undertaken where other approaches are unsatisfactory
16. h as 10 mg L while for background concentrations greater than 100 mg L suspended solids concentrations could increase by up to 10 These are the proposed water quality objectives for suspended solids These Water Quality Objectives apply along the Given River from Point 1 to Point 2 except in initial dilution zones of effluents http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 13 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide These initial dilution zones of effluents are to extend no further than 25 in some cases 50 across the river width from the bed to the surface and extending no further than 100 m downstream in any direction for discharges to lakes or marine areas and upstream when tidally influenced from a discharge or a series of discharges In the case of non point sources such as forestry operations the dilution zone would be along the length of the forestry operation area and up to 100 m downstream from the furthest downstream edge of that area unless such a definition should cause the dilution zone to infringe on fish shellfish habitat recreation areas or water intakes In such a case the dilution zone would terminate at the upstream edge of the area and the proposed water quality objectives would be expected to be achieved within the area Common Water Quality Objectives In most instances the proposed Water Quality Objectives are the same as the
17. l 28 000 Cariboo Pulp and Paper PE 1152 4 3 13 Industrial 118 200 City of Williams Lake PE 255 4 3 14 6820 Return to Water Quality Assessment Non point Sources Non point or diffuse sources refer to activities which can contribute contaminants to a water body in a diffuse manner but which do not result in a discharge through a pipe which is under permit Examples of these types of discharges are storm water from a city or agricultural runoff Precipitation chemistry information obtained from Environment Canada might appropriately be placed in this chapter For non point source discharges provide information for factors such as the areas of forestry activities agricultural land use numbers of homes using septic tanks and tile fields soil sensitivity to generate surface runoff or leaching to ground water and numbers and locations of livestock grazing Impacts from Agricultural Operations We present below an example table estimating increases in concentrations in a water body due to livestock grazing We base these estimates upon literature values such as from Bangay 1976 for the amount of nitrogen and phosphorus generated by types and sizes of different livestock and on http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 10 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide the number of livestock units in an area the length of time in that area e the numb
18. lly approved by the Ministry ensure a review and critique of the Technical and Overview Reports as follows e carry out a review of the first draft of the Technical Report and the Overview report within Region to ensure quality and accuracy of all material e carry out a review of the second draft of the Technical Report and the Overview report by Water Quality Branch Federal Agencies e g Environment Canada Fisheries and Oceans and other government and non government stakeholders e carry out a review of the penultimate draft of the Overview report by Program Directors for Water Management Environmental Protection and Fisheries Management e obtain sign off of the title page of the Overview report by the Assistant Deputy Minister for Regions and the Executive Director of the Environmental Protection Department e obtain a library catalogue number CIP from the legislative library Catalogue Section by sending copies of title page and table of contents We suggest that every effort be made to limit review time to about one month for reviews of each of the first and second drafts There may be occasions when you need to incorporate proposed Water Quality Objectives into a Waste http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 18 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide Management permit or Operational Certificate prior to formal approval through the above proc
19. m with such information as the length of a river and its slope drainage area pattern water body size predominant weather patterns biogeoclimactic classification etc Return to Water Quality Assessment Hydrology Limnology and or Oceanography Include as appropriate a description of the water body with major tributaries and other important features of the area such as stream and river flows including Water Survey of Canada gauging stations lake characteristics and water retention times and or marine currents and tidal action Especially important are seven day low flows mean annual and 1 in 10 year and their timing so that you can make worst case calculations in chapters that follow For lakes include bathymetric maps can be obtained from Ministry of Environment Fisheries Branch or for some cases Water Management and present any profile information in time depth diagrams Other pertinent information may include factors such as precipitation quantities available from Environment Canada Return to Water Quality Assessment Water Uses It is desirable to obtain public input into the perceived water uses which should be protected for a water body Sub divide water uses into categories such as contact recreation contact local Ministry of Health office licensed water withdrawals available from Water Management of the Ministry of Environment and use by aquatic life Include information on contact recreation such as areas of the
20. ng significant to aquatic quality These site locations can be Flow monitoring sites Permitted waste discharge locations Water intakes Recreation areas Fish shellfish habitat Forestry operations Agricultural operations Residential areas Dams Marinas or harbours Ambient water quality monitoring sites Storm water and combined sewer overflows Locate the Figures after the text and reference them in the Technical Report Follow the text of the Overview Report with a Figure showing the sites to be monitored for the proposed Water Quality Objectives http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 17 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide Return to Water Quality Assessment Tables We have documented examples of tables to be included in previous sections of this Chapter Locate large tables after the text references and Figures in the Technical Report In the Overview report a Table summarizing the water quality objectives is included as illustrated in Appendix 5 Appendices Use Appendices as appropriate to include more bulky supporting information in the report which cannot be readily referenced to other documents We consider information included in Appendices as normally essential to data interpretation or to avoid loss of the information were it to be summarized Return to the Table of Contents Administrative Procedure To be forma
21. p these two topics separately in two chapters That is acceptable Ambient Water Quality Summarize ambient water quality data in tables at the end of the text The sources for data will vary from Region to Region but in general would include Ministry data files the Ministry SEAM computer data base federal government Departments such as Environment Canada and their ENVIRODAT data system or Department of Fisheries and Oceans and universities Below is an example of a common data summary Summary of Ambient Water Quality Data for Site E XXXXX on the XXXXX River at XXXXX dates mg L or as noted values O waw Eoo ae p Ca ee ee ee Be Be iad rn RS Ree Oe ee temperature degrees C LE a eas eae http www env gov be ca wat wq BCguidelines wq_ob_user_guide usersguide html 12 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide In assessing water quality you should detail data information gaps e examine the range of values obtained at each station relative to applicable water quality criteria e document the number and extent that each variable exceeds the criteria e allow for the effect within expected conditions for the water body itself of ancillary variables such as pH temperature conductivity and hardness which can affect the toxicity of some substances e consider the dilution capacity of downstream tributaries which may have more sensitive designated water uses than u
22. ps a domestic licence not used for drinking water but for livestock watering etc Return to Water Quality Assessment Permitted Discharges These are usually associated with discharges to soil or water and will have the potential to have some sort of impact on water quality The presence of such discharges can be obtained from files of Environmental Protection of the Ministry of Environment Describe each permit in terms of the operation process and list permit requirements Summarize all monitoring data for the discharge as shown below in a table Review and discuss these data for their environmental impact in terms of loadings dilution http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 8 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide available in the initial dilution zone and with complete mixing and in the case of discharges to ground the distance to surface waters Include a discussion of substances which may have an environmental impact due to the nature of the discharge but for which no data are available Table XXXXX Summary of Effluent Discharged from Operation XXXXX PE XXXXX Variable No of Standard Values deviation Suspended solids solids ae a ee po eee ee ae ee eee ee Impacts from Discharges Include in the discussion any critical single or periodic receiving water measurements showing the possible impact on water quality of a partic
23. pstream water bodies e examine loadings and potential increases or decreases in the water quality variables in the water body from natural sources such as tributary streams e examine loadings and potential increases or decreases in the water quality variables in the water body from anthropogenic sources e discuss ameliorating factors which may necessitate that criteria considered should be relaxed or made more stringent e g complexing hardness e ultimately propose Water Quality Objectives for a reach of the water body where anthropogenic sources are or may be responsible for changes in a variable that threatens water uses You should seek public input at this point Proposing Water Quality Objectives We recommend that key variables e g ones that exceed Water Quality Criteria or need Water Quality Objectives be displayed in graphs or tables within the text This will allow important spatial and temporal aspects of their distribution to be displayed Include a statement in the text preferably after the first Water Quality Objective is defined for a water body which defines the initial dilution zone where the Objective does not apply The layout for the first objective proposed and the definition of the initial dilution Zone would be similar to The Ministry criteria for induced suspended solids concentrations to protect aquatic life are that for background concentrations of less than 100 mg L suspended solids could increase by as muc
24. ular discharge Place these types of tables within the text see example below since they are short do not disturb the flow of the text when reading the assessment and allow the data to be easily examined simultaneously with the explanation Coliform Concentrations in the River Near PE 146 Sample 200 m u s 100 m u s 400 m d s 1 6 km 8 km d s 16 km 20 km Site Hwy 97 PE146 PE146 d s PE 146 d s d s PE 146 PE 146 PE 146 east west east west east west east west east east west east west west April 22 100 2400 8 2400 14 1500 20 60 a 1987 Sep 16 130 5 540 49 540 11 540 130 920 79 350 540 1987 Nov 13 17 18 7 250 16 390 12 45 120 49 250 120 1991 diffuser When a large number of discharges occur to a large area summarize the information based on tributaries and or river reach as shown in the following table which would be located in the section of tables at the rear of the document http www env gov bc ca wat wq BCguidelines wq_ob_user_guide usersguide html 9 of 19 2006 01 17 3 01 49 PM Developing Water Quality Objectives in BC A User s Guide REACH Tete Jaune Cache to Nechako River Name of discharger Permit Report Discharge type Permitted number section volume m3 day REACH Nechako River confluence to Hope 0 Name of discharger Permit Report Discharge type Permitted number section volume m3 day Quesnel River Pulp Co PE 5803 4 3 12 Industria
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