Quality Assurance Project Plan. Sequim-Dungeness Watershed Water Pollutant Concentration Pilot Sampling Project

Transcription

1 Addendum Quality Assurance Project Plan Sequim-Dungeness Watershed Water Pollutant Concentration Pilot Sampling Project by Edward Chadd, Clallam County Department of Community Development Robert Knapp, Clallam County Department of Community Development Carol Creasey, Clallam County Department of Community Development Clallam County Department of Community Development 223 East 4 th Street, Suite 5 Port Angeles, Washington September

2 Publication Information Within a month of publication, this addendum will be available on Clallam County s website at Go to the link labeled Stormwater Monitoring. The project plan that is amended by this document can be found at All data gathered under this project will be available by January 2011 from these websites: Clallam County: Stormwater Monitoring link WA Dept. of Ecology: U.S. Environmental Protection Agency: The overall project area is depicted in Figure 1 in the text. Specific sites and watercourses intended for sampling are listed in Table 2 in the text. For more information contact: Robert Knapp Clallam County Department of Community Development 223 E. 4 th St., Suite 5 Port Angeles, WA streamkeepers@co.clallam.wa.us Clallam County Department of Community Development: dcdadmin@co.clallam.wa.us Any use of product or firm names in this publication is for descriptive purposes only and does not imply endorsement by the authors or their employers. 2

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4 Summary of Changes Between December 24, 2008 and May 15, 2009 Clallam County sampled stormwater runoff at ten sampling locations in the Sequim-Dungeness valley (See Sequim-Dungeness Watershed Water Pollutant Concentration Pilot Sampling Project approved in December 2008). We plan to resume sampling in October 2009, following our existing sampling plan with only minor changes. Due to our late start last year, we were unable to capture the first storm of the rainy season. This addendum states our plan to sample storm events early this storm season while maintaining consistency with our data collected last season. Changes include; o Adding one new sampling location which is Dungeness Meadows o Field sampling for turbidity using only a ratio turbidimeter and not a non-ratio meter o Minor amendments to our lab QA sample such as eliminating analytical duplicates o Minor amendments to our storm selection and qualification criteria to include snow-melt o Schedule update to extend the sampling time period through November 2009 These changes are described in the next few paragraphs and highlighted in the text and tables. New Sampling Location- Dungeness Meadows Because of the multiplicity of land uses, potential pollution sources, and stormwater conveyances in the project area, several study areas are involved, each designed to investigate particular problems. Each study area is to be considered a sub-project. Figure 1 shows the locations of these study areas/sub-projects: Agnew, Dungeness Meadows, Lotzgesell, East Sequim, Meadowbrook, Eureka, and Safeway. We have selected the additional sampling location (Dungeness Meadows) based on input from our sampling advisory committee. This site (Figure 2) will be sampled primarily to look for pesticides and herbicides and is now included in Table 2 *. Last May (2009), we sampled at two locations where pesticides were the parameters of interest; the addition of this new site provides us three sites that we can compare during a single storm event. Page ten of this document provides supporting text for the Dungeness Meadows site selection. Field Sampling with Ratio Turbidimeter For this round of sampling, we will be using only a Hach (Model 2100P) ratio meter for all our field measurements of turbidity and not both ratio and non-ratio (HF-scientific) meters. We have completed data collection for side-by-side comparison of ratio and non-ratio turbidimeter with over 340 side-by-side measurements. Provisional data analyses indicate that the non-ratio and ratio meters provide similar reading through 100 NTU and then diverged at higher turbidity levels as was predicted. Additionally, we found the Hach meter to be far easier to work with in the field compared to the HF-Scientific non-ratio meter. The 2100P is the accepted instrument used by WA Department of Ecology s Environmental Assessment Program. Revised text is on page 11. *Note that table numbers in this document are non-sequential to retain the numbering of the corresponding table in the original QAPP document for ease of comparison. 4

5 Quality Assurance Based on discussions with Stuart Magoon of Manchester Environmental Laboratory, we are planning to have Manchester perform lab samples for quality assurance as specified in Table 6. These lab procedures coupled with field replicates and blanks (Table 9 in the QAPP) will provide us with sufficient QA/QC for a screening-level project. Inclusion of Snow-melt to Qualification Criteria Table 1 now includes the affects of snow-melt on runoff and steam stage. Therefore, we have improved our wording in Table 1 to include snow-melt in the sample collection, selection, and qualification criteria. Snow-melt induced runoff transports pollutants in a similar manner to rainfall runoff and so we will treat them similarly. Update of Schedule We are extending the sampling period through November 2009 and Table 4 reflects the schedule for completing field and laboratory work, data entry, and reports. All other methods, procedures, and tasks shall follow the existing QAPP that was approved in

6 Background/Problem Statement Figure 1: Study area map. 6

7 Experimental Design Table 1. Sample collection, selection, and qualification criteria. ( Sampling rotation refers to the target interval between sample grabs, beginning with the first sample.) Site/ basin hydrologic response type Flow prestorm? Example defined as: Sampling rotation interval 1 st sample to submit to lab 2 nd sample to submit to lab 3 rd sample to submit to lab Fast Y Largesystem storm sewer Fast N Parking lot Observable flow increase Medium Y Stream Observable bank runoff or stage rise Medium N Dry irrigation ditch Slow Y Pond outflow Slow N Pond outflow in early fall First runoff Flow adequate to collect samples Observable flow increase Observable outflow 60 Pre- Zerotime , then 4 hr. 60, then 4 hr Pre st sample + 30 a.s.a.p. after Peak stage within 1 st 12 hr* Peak flow (visit every 4 hr) Peak flow (visit every 4 hr) + 60 Peak stage within 1 st 12 hr* *Exception solids samples: collect at/near actual storm peak if possible. ** preceded by 48 hr of no measureable rainfall or melt induced stage rise Qualifying storm ** Enough precipitation or snow melt to visibly increase flow Enough rain or melt to cause runoff 0.05 in 12 hr 0.05 in 12 hr 0.1 in 24 hr 0.1 in 24 hr Study Areas, Sampling Sites, and Laboratory Parameters 7

8 Table 2. Study areas, sites, and laboratory parameters for analysis. These study area and sites are tentative; see discussion above. Seasonal timing codes: FF = first flush; LLS = larger, later storms; PLT = post-land-treatment; see Experimental Design above. PAH = Polynuclear aromatic hydrocarbons; Pesticides = PESTMS (Pesticides mass spectrometry) + Herbicides Study area Sampling site abbreviation Watercourse name Agnew AgFnHall Agnew DngMead Spring Creek Lotzgesell LotzWdck Lotzgesell Creek E_Sequim HldWash Highland Source/Receiving water NHD Reach Code (if known) If site is not on a stream, name (if known) of receiving water destination (if known) S Strait of Juan de Fuca R Dungeness River NHD Reach Code (if known) of receiving water destination if known (if site is not on a stream) Ideal seasonal timing Hydrologic response time Laboratory analytes: Bacteria (fecal coliform) Nutrients (NH3 + Total P + NO2-NO3) Solids (Suspended Sediment Conc.) Metals (Cu + Zn + Hardness) PAH standard list Pesticides Priority Pollutant Metals PLT medium N Y Y Y N N Y N PLT medium N Y Y Y N N Y N R PLT slow N N Y N N N Y N S Bell Creek FF medium Y Y Y Y N N N N E_Sequim BelBlake Bell Creek R FF medium N Y Y Y Y* Y N Y E_Sequim HldHpyVly Highland E_Sequim SqBayRd Highland S Johnson Creek LLS medium Y Y Y Y N N N N S FF fast N Y Y Y Y Y N N Meadowbrook MdwCr MdwDtch Flow prestorm? D_Meadows Meadowbrook Meadowbrook Creek Highland Eureka EurWash Eureka Safeway SfwyCB Storm drain R LLS medium Y Y Y Y N N N N S Meadow-brook Creek LLS medium N Y Y Y N N N N S LLS medium Y Y Y Y N N N N S FF fast N Y Y Y Y Y N N *At E_Sequim/BelBlake, the Priority Pollutant Metals suite (As, Ag, Sb, Be, Cd, Cr, Cu, Hg, Pb, Ni, Se, Tl, Zn) will also be analyzed, but only with one sample per event, with timing described in Table 1 as A.S.A.P after zero time. (Budgetary considerations do not allow additional samples.)

9 Figure 2 Dungeness Meadows study area 9

10 Study Area: Dungeness Meadows ( D_Meadows ) This study area focuses on the area surrounding the Dungeness Meadows residential development. The development is composed of residential dwellings surrounding a private golf course. Irrigation ditches and landscape water features convey Dungeness River water through the development. The surrounding land uses include residences, roads, and the golf course. This site was selected because of suspected pesticide application on the golf course and potential for runoff transported pollutants. Objectives of this study include: Characterizing storm-event concentrations of pollutants presumed most likely to be found in Spring Creek, based on upslope land uses (see above). Comparing pollutant concentrations in this creek with those draining agricultural lands (see Agnew study area in QAPP). Comparing pollutant concentrations in this creek with those of another site that drains a golf course (see Lotzgesell study area in QAPP). Examining how pollutant levels differ during the course of a storm event, between the beginning of stage rise and peak flow. Site location and laboratory parameters to be analyzed (see Figure 2 for orthophoto view): DngMead: This site is on Spring Creek just downstream of Dungeness Meadows and just before the outtake point for Sequim Prairie-Tri Irrigation Association. Water not drawn for irrigation flows to the Dungeness River. Contributing land uses include residences, roads, and the golf course. o Bacteria; Nutrients; Solids; Pesticides Scheduling Table 4. Schedule for completing field and laboratory work, data entry, and reports. Field and laboratory work Field work completed November 2009 Laboratory analyses completed December 2009 Data review completed December 2010 Database entry Personnel responsible for Entry into EPA STORET, ECY Environmental Information Management, and Clallam Edward Chadd/Lori DeLorm County Water Resources databases Data uploaded to databases December 2010 Final report Author lead Edward Chadd Schedule Draft due to advisory committee November 2010 Final report due on web December

11 Decision Quality Objectives Quality Objectives Table 6 shows the number and kind of laboratory QA samples for the project. These laboratory analyses form the basis for quality assessment of project data. Table 6. Number and Kind of Samples for Laboratory QA. Parameter Laboratory Control Sample Standard Reference Material Method Blank TR* PP metals 1/batch 1/batch 1/batch Dissolved Copper and Zinc 1/batch 1/batch 1/batch Hardness 1/batch 1/batch Nutrients 1/batch Matrix Spikes & Spike Duplicates 1 each/batch Herbicides 1/batch 1/batch 1 each/batch Pesticides 1/batch 1/batch 1 each/batch PAH (std) 1/batch 1/batch 1/batch 1 each/batch Fecal Coliform SSC 1/batch 1/batch N/A *Total Recoverable Measurement Quality Objectives (MQOs) will be determined from data acceptance limits set by the WA Dept. of Ecology s Manchester Laboratory, as well as from laboratory case narratives. Standard QC samples will be analyzed for metals, nutrients, pesticides, herbicides, PAH and SSC. These will include field blanks to show background levels associated with the sampling process, and replicates to indicate field variability. Laboratory QC sample including laboratory control samples, standard reference material, method blanks, spike and spike duplicates will be analyzed to show interference of the sample matrix. Field-parameter measurement procedures Turbidity will be measured with a ratio turbidimeter. Samples will be analyzed within 48 hours of collection. Hach Model 2100P Streamkeepers of Clallam County 11