Appendix E: SWMF Monitoring Protocol

Transcription

1 MS4 Program Plan (Permit No. VA ) - June 2017 Appendix E: SWMF Monitoring Protocol E-1 MS4 Program Plan.docx

2 SWMF Monitoring Protocol Prepared for City of Virginia Beach Public Works Engineering Surface Water Regulatory Compliance Division

3 SWMF Monitoring Protocol Prepared for City of Virginia Beach Public Works Engineering Surface Water Regulatory Compliance Division June 2017

4 Table of Contents List of Tables... ii List of Abbreviations... iii Executive Summary... iv 1. Monitoring Locations Methodology Analytical Methods Total Suspended Solids Total Nitrogen Total Phosphorus Hydrologic Monitoring Methods Precipitation Monitoring Monitoring Protocols and Procedures Water Quality Sampling Procedures Measurement of Field Parameters Sampling Volume Sampling Containers Sample Collection Procedure Sampling Splitting, Preservation, Holding Sampling Chain of Custody Quality Control Samples Monitoring Data Management Data Quality Objectives Data Validation Data Reporting References Appendix A: Figures... A-1 Appendix B: Field Sampling Sheets... B-1 List of Tables Table 2-1. USGS Rain Gauges Table 3-1. Sampling Parameters Table 4-1. Data Quality Objectives ii

5 Executive Summary The City of Virginia Beach (City) developed this stormwater management facility (SWMF) monitoring methodology and protocols plan for compliance with the City s Individual Phase I municipal separate storm sewer system (MS4) Virginia Pollutant Discharge Elimination System (VPDES) permit (VA ) Part I.C.2. The permit identifies three SWMF locations that are required to be monitored for total suspended solids (TSS), total nitrogen (TN), and total phosphorus (TP). The three monitoring locations are College Park Elementary School StormTech underground detention facility, Bow Creek Recreation Center wet pond, and Old Donation Centers and Kemps Landing Magnet School StormTech underground detention facility. Monitoring for these parameters will be performed by collecting grab samples at the SWMF inlets and outlets. The purpose of this monitoring is to measure the effectiveness of pollutant removal at these SWMFs by comparison of constituent concentrations between the inlet and outlet locations. The permit requires monitoring to be performed at each site at least once per quarter between January 1st and December 31st. This will make four monitoring events during the year, each of which will be performed during wet weather conditions. iv

6 Section 1 Monitoring Locations The three SWMF monitoring locations are the following: 1. College Park Elementary School (Latitude , Longitude ) a. College Park Elementary School is located in the western portion of Virginia Beach and is located within the Elizabeth River Watershed. This site has a StormTech underground detention facility, which was installed in 2011 and is located to the west of the baseball field, as shown in Figure Bow Creek Recreation Center (Latitude , Longitude ) a. Bow Creek Recreation Center is located in the Lynnhaven River Watershed of Virginia Beach. Bow Creek Recreation Center has a large wet pond designed to collect and treat stormwater runoff in the area. This SWMF was completed in 2015 and is shown in Figure Old Donation Center and Kemps Landing Magnet School (Latitude , Longitude ) a. Old Donation Center and Kemps Landing Magnet School is located in the Lynnhaven River Watershed within the City of Virginia Beach. The Old Donation Center and Kemps Landing Magnet School has a StormTech underground detention facility, which was installed in 2016 and is located under the bus drop-off area, shown in Figure

7 Section 2 Methodology The three monitoring parameters, TN, TP, and TSS will be collected by performing grab samples at the locations specified in Section 1. These sampling events will be performed under wet weather conditions and associated rainfall data will be collected from using the closest United States Geological Survey (USGS) rainfall monitoring gauges. Figure 4 shows the USGS rainfall gauges with relationship to the SWMF monitoring sites. Further information regarding these rain gauges is discussed in Section 2 and Table 2-1 lists all the SWMF sites and the closest rainfall gauges. The collected field data, along with any analytical laboratory data, will be cataloged and kept on record for a minimum of three years. 2.1 Analytical Methods The samples collected for this project will be analyzed by accredited laboratories as per 1VAC30-45, Certification for Noncommercial Environmental Laboratories or 1VAC30-46, Accreditation for Commercial Environmental Laboratories. All analytical methods performed will be in accordance with approved methods under 40 CFR Part 136. The laboratory will provide the method of reporting limits for each parameter based on the equipment. The monitoring reporting records will contain the following: Date, exact place and time of sample List of individuals conducting the sampling Dates and times the analysis was performed Analytical method used Results Total Suspended Solids Total suspended solids (TSS) will be analyzed using SM 2540-D. There are no preservative chemicals used for this sample, but after collection the sample must be stored on ice at 4 degrees Celsius and its maximum holding time is seven days from collection. The minimum recommended reporting limit for TSS is 0.5 mg/l Total Nitrogen Total nitrogen (TN) is comprised of total Kjeldahl nitrogen (TKN) and nitrate-nitrite nitrogen. TKN is made up of ammonia, organic, and reduced nitrogen. Samples are taken separately for TKN and nitrate-nitrite and then a calculation is performed by the laboratory to determine the TN concentrations present in the sample. Measurement of ammonia nitrogen can also provide insight into pollutant sources and SWMF function. The analytical method that will be used to measure TKN is EPA The sampling method that will be used for nitrate-nitrite will be SM 4500-NO3-F The maximum holding time for both TKN and nitrate-nitrite samples is 28 days. Both samples have a preservative of sulfuric acid (H2SO4) to ph 2-1

8 SWMF Monitoring Protocol Section 2 <2, and are required to be stored on ice at 4 degrees Celsius. The minimum recommended reporting limits are 0.01 mg/l for nitrite-plus-nitrate nitrogen and 0.1 mg/l for TKN Total Phosphorus The analytical method to be used for total phosphorus (TP) will be EPA This method uses a preservative of sulfuric acid ph <2 and the collected sample is required to be stored on ice at 4 degrees Celsius. The maximum holding time is 28 days from collection. The minimum recommended reporting limit for TP is 0.01 mg/l. 2.2 Hydrologic Monitoring Methods To monitor hydrologic parameters at the SWMF sites, rainfall data will be collected Precipitation Monitoring There are currently USGS rainfall monitoring gauges in the vicinity of the SWMF sites. There are a total of three gauges that are close to the sites and these gauges take readings every six minutes. All these gauge data are public, can be accessed online, ( and data is uploaded instantly. Table 2-1 lists all the SWMF sites and the closest rainfall gauges to each. Appendix A, Figure 4 includes a map of the selected rain gauges and the SWMF sites. SWMF Location Bow Creek Recreation Center College Park Elementary School Old Donation Center and Kemps Landing Magnet School Table 2-1. USGS Rain Gauges Closest USGS Rain Gauge Distance to USGS Rain Gauge (mi)

9 Section 3 Monitoring Protocols and Procedures All samples will be collected using the manual grab sampling method and will be performed during or within one hour of wet weather events. For rainfall to be considered a wet weather event, it must meet the following conditions: The total depth of the storm should be more than 0.1 inch, and There should be at least 72 hours of dry weather prior to the monitored storm. Rainfall data will be referenced from the closest USGS rain gauge to each SWMF. The rain gauge locations are provided in Figure Water Quality Sampling Procedures During each quarterly sampling event, field parameters will be recorded and manual grab samples will be collected at each sampling point. Protective gear to be worn includes safety vests, steel-toed boots, nitrile gloves, and safety glasses (if chemical preservatives are handled) Measurement of Field Parameters The associated sampling location, date, and time will be documented. Notes will also be recorded regarding the weather along with visual conditions of the site including structure conditions, water color, turbidity, odors, trash, etc. Calibration of the sampling equipment will be performed prior to each sampling event. This will be done according to the manufacturer s instructions for sampling related instruments. The sampling probe will be inspected prior to each sampling event and the probe will also be cleaned with deionized water before and after each use Sampling Volume The common collection volumes for each parameter to be collected are shown in Table 3-1. Depending on the specific analytical laboratory requirements, these volumes could change. Staff will consult with the specified lab prior to collection to determine the appropriate volume is captured Sampling Containers In compliance with 40 CFR Part 136, the sampling containers will be made of either polyethylene (HDPE), fluoropolymer (PTFE), or glass, which are all chemical resistant. The analytical laboratory providing the sampling kits will specify which type of containers will be used. Field personnel will not need to decontaminate these containers, as they will come ready for sampling from the analytical laboratory. The lab will provide the prepared bottles with labels to be filled in, a chain of custody, and a cooler. These bottles should not be opened or used to hold anything else prior to sampling to avoid contamination. Contamination will also be prevented by avoiding touching the insides of the bottles. 3-1

10 SWMF Monitoring Protocol Section Sample Collection Procedure Sampling will be performed at the furthest downstream location first and then working upstream, to avoid stirring up any sediment that could skew a downstream sample. To manually collect a grab sample, the open bottle is inserted downstream of the discharge point with the bottle opening facing upstream and at an angle. The sampling point should be taken in the (horizontal and vertical) center of the channel at mid-depth. If sampling is required at a manhole, a sample bottle holder will need to be used. If one bottle is used to collect the sample and then fill another bottle, the sample bottle should be rinsed with deionized water between sample locations, and also rinsed with sample water prior to collection. Collected samples will be appropriately labeled with date, time, sample ID, and whomever collected the sample. The samples will then be immediately stored on ice Sampling Splitting, Preservation, Holding Samples will be preserved according to the laboratory methods of 40 CFR Part 136. There are two ways that the laboratory can prepare the sampling kits. Chemical preservatives can either come in separate containers or the sampling bottles will already contain a pre-measured amount of preservative. If the preservatives are separate, they will be added directly to the collected sample and mixed by closing the bottle and shaking it for thorough mixing. If the sampling bottle already contains the preservative, care must be taken not to over fill the bottle when collecting the water sample, to prevent dilution or removal of the preservative. All stormwater samples will be immediately stored on ice and must not exceed the maximum holding time for its sampling parameter. Table 3-1 shows each sampling parameter and its respective requirements. Parameter Table 3-1. Sampling Parameters Added Preservative Preserve at 4 o Celsius Volume to Sample 2 (ml) Maximum Hold Time Nitrate-Nitrite H2SO4 to ph <2 Yes days Total Kjeldahl Nitrogen H2SO4 to ph <2 Yes days Total Phosphorus H2SO4 to ph <2 Yes days Total Suspended Solids None Yes days 1 40 CFR Part 136; 2 EPA NPDES Storm Water Sampling Guidance Document Sampling Chain of Custody For any sampling procedure analyzed by a third-party laboratory, a completed chain of custody form is required. The chain of custody should be filled in with the same information that is included on each collected sample label. A chain of custody confirms that samples are tracked from their time of collection to analyzation. All samples will have unique label identifications according to each site. Each sampling container will be labeled clearly and its information will correspond directly with the completed chain of custody Quality Control Samples Quality Control (QC) procedures are performed to keep potential field and laboratory errors to a minimum. Quality Control procedures include appropriately calibrating and keeping up with any maintenance required for all sampling equipment. Calibration will be performed before every sampling event. Other QC methods that will be used for this project include collecting field blanks 3-2

11 SWMF Monitoring Protocol Section 3 and duplicate samples. These methods detect if there is contamination during sampling, shipping, or analysis. The QC-related samples represent 10% or more of the total samples collected. As described below, the annual objective for QC samples is two field blanks and four duplicate samples. Field Blanks To appropriately determine if contamination has occurred during sampling, field blanks must be collected during a minimum of two sampling events during the year. A field blank sample will be collected during the first and third quarterly sampling events. Field blanks are collected for grab samples by filling a separate set of sampling bottles with deionized water during ambient conditions and submitting them as blind samples to the lab. If a separate bottle is used to collect samples prior to pouring them into the laboratory-supplied bottles, the field blank sample should also be placed in the sample collection bottle before being transferred to the laboratory-supplied bottles. The lab will analyze these using the same methods as with the regular samples. Duplicates At least one duplicate sample should be collected during each quarterly sampling event. To collect a duplicate sample, a second full set of sample bottles are collected at one of the existing sampling points. When collecting a duplicate sample, it must be collected in the exact same manner as the parent sample and is collected immediately following the collection of the parent sample. Duplicate samples also must be stored in the same cooler as their parent samples. These duplicates are also considered blind, and are taken to determine if there is any variability in collection, shipping, or laboratory analyses. 3-3

12 Section 4 Monitoring Data Management By collecting and analyzing the results of the water quality sampling, the installed SWMFs will be measured for their effectiveness of pollutant removal. The data management methods described in this section are used to guide the quality of the data for interpretation and permit compliance 4.1 Data Quality Objectives The field and laboratory procedures described in Section 3 explain how the samples should be collected in a consistent manner, are representative of the inflows/outflows of interest, and are analyzed using the correct methods. Table 4-1 identifies the quantitative data quality objectives (DQOs) for this monitoring effort, which are intended to measure precision, representativeness, and completeness of the data. Table 4-1. Data Quality Objectives No. Parameter/Methods Objective 1 Duplicate water quality samples 2 Field blanks 3 Completeness of water quality monitoring data Relative percent difference should be equal to or less than 25% Concentrations of water quality constituents should be below the reporting limit. >97% completeness 4.2 Data Validation All event sampling and monitoring data will be recorded in both a field logbook and on water quality forms included in Appendix B. Upon returning from the field, field staff will scan all field notes, field forms, and chain-of-custody forms, and store the electronic files in the project directory. Field parameter measurements will be entered into a central database, either manually or by transfer from electronic field forms, if the form in Appendix B is converted into an electronic version for use with mobile devices. Field data that was collected in association with failed calibration checks will be flagged with an associated explanation. Within three days of receipt of laboratory data, staff will review the data for completeness and identify issues that require communication with the laboratory (e.g., missing data, lab QA flags, suspect values). Laboratory results and all associated flags and comment codes will also be stored in the central database. The required analytical equipment calibration will be performed accordingly by the laboratory. The laboratory will follow all appropriate QA/QC procedures as specified in 40 CFR Part 136 and any subsequent analytical method requirements. All laboratory staff are expected to be trained in the appropriate EPA and/or DEQ methods. During laboratory data review, data validation flags are to be given to samples which fall outside the appropriate detection limits. These flags must also include a description with why the particular data was flagged. In the validation report, the laboratory should 4-1

13 SWMF Monitoring Protocol Section 4 state whether or not the quality of the flagged data will affect the overall results. Potential corrective measures will be discussed with the project manager before being performed, and will be noted in the validation report. Other forms of QC that will be performed include checking that all data entered into the database is equivalent to the original completed field sheets. The laboratory will maintain and provide performance records on the quality of data generated. At least once per year, the QA officers (Owner and Engineer representatives) of the project will complete a data review and validation that will include: (1) evaluation of data quality objectives of Table 4-1, (2) a quality check of transfer of data from field/laboratory forms to the central database, involving results from at least 5% of the samples, and (3) a review of the laboratory s most recent QA reports. The QA officers will identify correction actions to be taken, which might include staff retraining, equipment replacement, modification of field procedures, etc. 4.3 Data Reporting On an annual basis, the SWMF monitoring results will be summarized in a report for inclusion in the City s annual MS4 report. The report will include the following information: 1. Tabulation of monitoring results and analysis a. Date b. Location c. Parameters d. Method e. Concentrations including qualifiers, comment codes, or flags 2. Interpretation of data with respect to patterns/trends, and results of the annual data validation and any corrective actions. 4-2

14 Section 5 References Virginia Department of Environmental Quality, MS4 Permit No. VA , Effective July 1, U.S. EPA, NPDES Storm Water Sampling Guidance Document, EPA 833-B , July U.S. Government Publishing Office Electronic Code of Federal Regulations, 40 CFR Part 136 Guidelines Establishing Test Procedures for the Analysis of Pollutants, April 20, 2017, (April 24, 2017). 5-1

15 SWMF Monitoring Protocol Appendix A: Figures A-1

16 Note: The dottled line represents the approximate location of the StormTech chamber. The exact dimensions and location of the BMP should be verified with the construction drawings or in the field. BARNARD WY Inlet Monitoring Location Point A Outlet Outlet Monitoring Location Point B East Bioretention Cell West Bioretention Cell Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User Community SWMF Monitoring Plan College Park Elementary School Figure 1 Monitoring Locations Inflow Outflow Storm Manholes Storm Inlets Storm Nodes Storm Main Ditches NHD Flowline ± Feet

17 IC E PL BE R N Inflow Monitoring Location Point A A AV P AN PI UB CL E RD US O H Inflow Monitoring Location Point E Inflow Monitoring Location Point F Outflow Monitoring Location SWMF Monitoring Plan Bow Creek Recreation Center Figure 2 Inflow Outflow Storm Manholes Storm Inlets Monitoring Locations Nodes Storm NHD Flowline Storm Main Ditches 0 60 ± Feet

18 D VE R G RO Y E HON DE PEN INDE RD B) BL (S ION TAT NCE N PLA B) BL (N NCE DE PEN INDE RY FER Inlet 1 Inlet 2 CT ALBERT Outlet Inlet 3 SWMF Monitoring Plan Old Donation Center School Figure 3 Construction is complete and site stabilized Monitoring Locations Inflow Outflow ± Storm Manholes Storm Inlets Storm Nodes Storm Main Ditches NHD Flowline Feet

19 SWMF Monitoring Plan USGS Rain Gauge Locations and SWMF Locations Figure 4 ±

20 SWMF Monitoring Protocol Appendix B: Field Sampling Sheets B-1

21 Section 1: Background Data SWMF Site Location: Project: Today s date: Form Completed By: SAMPLE COLLECTION FIELD SHEET SWMF Type: Client: Time: Investigators: Temperature ( C): Closest USGS Rain Gauge: Staff Gauge Depth (if installed): Rainfall (in.): Last 24 hours: Last 48 hours: Last 72 hours: Total Number of Inflow Sampling Points at Site: Total Number of Outflow Sampling Points at Site: Sampling Point ID Sampling Point Description Section 2: Quantitative Characterization FIELD PARAMETERS Sampling Equipment Used: Sampling Point ID Time Temperature ( O C) ph Spec. Cond. (µs/cm) D.O. (mg/l) Turbidity (NTU) Comments/Notes (e.g., odors, trash, sheen, etc.): Page 1 of 2

22 SAMPLE COLLECTION FIELD SHEET Section 3: Sampling Collection ANALYTICAL SAMPLING COLLECTION Sampling Equipment Used: Sampling Label ID *Include any Field Blanks or Duplicates Collection Date Collection Time Collection Method # of Containers Collected Parameters Sampled For List any Preservatives Used Signature Page 2 of 2