In-Situ, Inc. – Aqua TROLL 600 Multiparameter Sonde – Low ...€¦ · In-Situ, Inc. – Aqua...
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In-Situ, Inc. – Aqua TROLL 600 Multiparameter Sonde – Low-Flow Groundwater Sampling Platform Overview: This document provides a description of low-flow sampling techniques, a summary of federal low-flow guidance, and outlines the intended operation of an Aqua TROLL 600 Sonde with the In-Situ, Inc. Low-Flow Sampling Platform. This document serves as a reference on how to properly program and manage all digital low-flow sampling data in a top-down project management sampling program. What is the purpose of Low-Flow groundwater sampling? Low-flow groundwater sampling is an increasingly accepted method of collecting groundwater samples with a strict set of guidelines to ensure consistent sample representation and quality. Groundwater is extracted from the well at a very low rate (<500 mL/min) so that drawdown of the water level is minimized. Water samples from the more hydrogeologically conductive areas of the aquifer around the well screen are monitored with water quality instruments for stability to indicate the change from stagnant well water to representative formation water. After the water quality parameters stabilize, a sample of formation water can be taken with a minimal amount of geochemical disruption to the sample. The purpose of Low-Flow sampling is to adopt a common or national sampling methodology that will produce better and more accurate data on the true chemical nature of a groundwater system, and create a repeatable uniform event which will produce better data, and lead to better conclusions and remedial solutions. Why should I adopt the In-Situ, Inc. Low-Flow Groundwater Sampling Platform? Meet sampling plan or scope of work requirements. Improve sample quality. Improve sample representativeness. Reduce wastewater created by large volumes of sample purging. Reduce field time by programming all your sampling events before you leave the office. Reduce field time with automated data collection and stabilization of water quality parameters. Eliminate errors created by manual field recording and manual data transcription. Create more detailed sampling summaries, records, and reports. Save time and money with quick and easy digital calibration and sampling report formats. Produce professional reports that can be digitally inserted into your project deliverables. Provide a complete calibration history of the sampling event to ensure sample validation. Create a digital sampling record that can be easily replicated by other technicians. Save time and money by digitally organizing sampling events.
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In-Situ, Inc. – Aqua TROLL 600 Multiparameter Sonde – Low-Flow Groundwater Sampling Platform
Overview:
This document provides a description of low-flow sampling techniques, a summary of federal low-flow guidance, and outlines the intended operation of an Aqua TROLL 600 Sonde with the In-Situ, Inc. Low-Flow Sampling Platform. This document serves as a reference on how to properly program and manage all digital low-flow sampling data in a top-down project management sampling program.
What is the purpose of Low-Flow groundwater sampling?
Low-flow groundwater sampling is an increasingly accepted method of collecting groundwater samples with a strict set of guidelines to ensure consistent sample representation and quality. Groundwater is extracted from the well at a very low rate (<500 mL/min) so that drawdown of the water level is minimized. Water samples from the more hydrogeologically conductive areas of the aquifer around the well screen are monitored with water quality instruments for stability to indicate the change from stagnant well water to representative formation water. After the water quality parameters stabilize, a sample of formation water can be taken with a minimal amount of geochemical disruption to the sample.
The purpose of Low-Flow sampling is to adopt a common or national sampling methodology that will produce better and more accurate data on the true chemical nature of a groundwater system, and create a repeatable uniform event which will produce better data, and lead to better conclusions and remedial solutions.
Why should I adopt the In-Situ, Inc. Low-Flow Groundwater Sampling Platform?
Meet sampling plan or scope of work requirements. Improve sample quality. Improve sample representativeness. Reduce wastewater created by large volumes of sample purging. Reduce field time by programming all your sampling events before you leave the office. Reduce field time with automated data collection and stabilization of water quality
parameters. Eliminate errors created by manual field recording and manual data transcription. Create more detailed sampling summaries, records, and reports. Save time and money with quick and easy digital calibration and sampling report
formats. Produce professional reports that can be digitally inserted into your project deliverables. Provide a complete calibration history of the sampling event to ensure sample validation. Create a digital sampling record that can be easily replicated by other technicians. Save time and money by digitally organizing sampling events.
Low-flow federal guidance summary:
The following points summarize federal guidelines that dictate the requirements of a low-flow groundwater sampling event.
1. Low-flow refers to the velocity that is imparted during pumping to the formation pore water adjacent to the well screen, not necessarily the flow rate of water discharged by the pump.
2. Low-flow purging can be used on any well capable of being pumped at a constant rate of 1.0 L/min or less without continual drawdown of the water level in the well.
3. A typical flow rate from a pump during low-flow purging is approximately 0.1 to 0.5 L/min.
4. Continuous discharge pumps with variable flow rates are preferred. Cyclic discharge is also acceptable (bladder pumps). Dedicated pumps are preferred. Grab sampling devices such as bailers, Kemmerer samplers, and inertial-lift devices cannot be used. Peristaltic pumps are discouraged because of loss of VOCs, degassing, and pH and oxidation reduction potential (ORP) changes.
5. You must have a water level indicator for initial readings and drawdown monitoring with accuracy (±0.01 ft. /3 mm).
6. Flow cells are preferred for monitoring, especially for dissolved oxygen (DO) and ORP readings, which will be altered if exposed to atmosphere.
7. Calibration of multi-parameter equipment is required once a day, with periodic checks. 8. The pump should be placed at the mid-point of the submerged well screen. 9. Drawdown in any well should not exceed 0.1 m/0.33 ft./4 in. or 25% of the distance
from the top of the well screen to the pump intake. 10. Stabilization parameters:
a. pH: ±0.2 pH units b. Conductivity: ±3% of reading c. DO: ±10% of reading or 0.2 mg/L, whichever is greater d. ORP: ±20 mV e. Turbidity: ±10% of the prior reading or ±1.0 NTU, whichever is greater (not
always required) 11. Flow cell sample rate measurement frequency should be based on the time required to
completely evacuate one volume of the flow cell, associated tubing and pump volume. 12. Stabilization is reached when three consecutive readings meet the stabilization criterion
listed above when sampled at the established rate. 13. Field reporting requirements:
a. Equipment calibration report b. Site specific data (project name, site, well number, well depth, well diameter,
screen length, casing type, pump type, tubing type) c. Initial water level d. Pump placement/type (relative to well screen and static water level) e. Final pumping rate f. Final stabilized drawdown g. Water quality measurements (date, time, temperature, pH, ORP, conductivity, DO,
turbidity)
In-Situ, Inc. – Aqua TROLL 600 Groundwater Sampling Procedure:
Please try and follow this top-down data management application in order to maximize your groundwater sampling event’s efficiency, accuracy and delivery. The new sampling platform allows for anyone to download Win-Situ 5 at no charge and program all your sampling wells prior to renting any equipment or going into the field, provided you have the data from a prior sampling event.
1. Download & Install Win-Situ 5 https://in-situ.com/support/documents/win-situ-5-software/
2. Download & Install VuSitu from the Android Ap Store (Play Store) 3. Open Win-Situ 5.0 – Go to “Tools” and click on “Low-Flow Setup”
Collect all the well sampling logs, sheets and information from prior sampling events. You have 2 options. If you are programming a sampling event for the first time, choose “Create new template” and enter all the sampling project information into the Low-Flow Sampling Platform in Win-Situ 5.0. First enter the project and site information. Click >
Once you have created a new template, you can program each well individually by repeating this process and choosing “Use existing template” where all the project data remains in the template, and all you have to do is change the well construction information for each well and create a new file. If all your information is readily available, it should not take you more than a minute to program each well and create an individual file.
Select New or Existing Template – Click >
Enter your project information – Click >
Select Your Units – Click >
Enter Well Construction Information - Click >
Enter Parameter Stabilization Criteria – Click >
Select channels and enter the stabilization criteria. This information should be in your sampling plan, but are listed below for reference. You can enter the American Society for Testing and Materials (ASTM) or USEPA ranges here. To use a percentage instead of a range, enter a range and a percentage, and the program will default to the percentage.
Enter Pump Information – Click >
Enter Purging Information – Click Check
You have the option to choose a specific sample interval, or a default system purge time which is automatically calculated based on the volume of the pump + tubing + flow cell.
All your project templates and well files will automatically be saved under Libraries>Documents>My Documents>LowFlow Templates
Once you have programmed your project template and all your wells, you can easily transfer the files to your Android Smart Phone. You have 2 options, you can physically transfer them through a USB connection, or for the purposes of the document, you can e-mail them to your phone.
Once you have e-mailed the low-flow files to your phone, open the files and download them to your phone. The LFJ files.LFJ are designed to automatically load into the VuSitu directory.
Open VuSitu to confirm the files are in the directory, click on the Vu-Situ icon. If you have an Aqua TROLL 600 System, you can connect to the AT600, or you can click on Work disconnected and locate the files.
Click on the upper-left menu bars and click on Low-Flow, and your files should appear.
Calibration Sequence:
Open VuSitu and connect to the Aqua TROLL 600. If you cannot connect, remember to loosen and then tighten the batter compartment on the AT600, this will reset the Bluetooth connection and you will automatically connect with the sonde. The LCD display on the AT600 will light up when you do this. If a Serial Number appears, you know it is working.
Once connected, click on Calibrations and calibrate to your specifications or click on Quick-Cal (multi-sensor) calibration.
Calibration will be automatic, and a Calibration report will be created. Click on Save to… and save you Calibration Report to the cloud or e-mail it to yourself.
Low-Flow Sampling Sequence:
To begin you sampling regime, set up on the well you want to sample, click on the upper-left menu bars, click on Low-Flow, choose the well template with the corresponding well you are sampling, review the Setup – Criteria – Well – Details and click Start when ready. Make sure you have a stable flow and drawdown established when you start the test. Click Start.
The low-flow sampling sequence will run automatically.
The software needs at least three water quality parameter readings to run a 3-point running average in order to calculate the stabilization values. For the sample set (A, B, C), [(Max-Min)/A] X 100 = Running Average.
You can rotate the screen to see all the water quality parameters being collected. The software will record your sample interval and show you a countdown until your next sample is taken.
Once a parameter has reached stabilization, the field turns green. Once all fields are green, you can click on Finish Test.
When you finish the test, you will have the option of recording laboratory samples that you collect for the well in question, and record any post-stabilization data. When you are satisfied, click Complete.
Once your test is complete, you will have the ability to review the data file, and then click Save to… You can then choose to save the file, text, e-mail, or store the file on the cloud, ensuring that you will not lose any data. The sampling event is also automatically stored on your mobile device. Then organize and manage your data to your specifications.
When you save the file by e-mail, 3-separate files are saved and sent to your computer, an HTML display of the data report (above), an Xcel file with the formatted data, and a PDF file. All files are automatically generated.
References:
1. ASTM Guideline D6771-02. July 2002. Standard Practice for Low-Flow Purging and Sampling for Wells and Devices Used for Ground-Water Quality Investigations.
2. Puls, R. W. and M.J. Barcelona. April 1996. Low-Flow (Minimal Drawdown) Ground-Water Sampling Procedures. U.S. Environmental Protection Agency, Office of Research and Development. Publication: EPA/540/S-95/504.
3. U.S. Environmental Protection Agency, Region 1. 30 July 1996. Low Stress (low flow) Purging and Sampling Procedure for the Collection of Ground Water Samples from Monitoring Wells. SOP #: GW 0001.
4. Yeskis, D. and B. Zavala. May 2002. Ground-Water Sampling Guidelines for Superfund and RCRA Project Managers. U.S. Environmental Protection Agency, Office of Solid Waste and Emergency Response. Publication: EPA 542-S-02-001.
These guidelines are federal and regional suggestions. Review with your local regulator.
David A. Wardwell Dune Technologies, LLC 1477 South Shore Drive Holland Michigan 49423 Office - (616) 377-7043 Cell – (616) 450-5788
In-Situ Remediation & Instrumentation
