GSI has developed multiple free software packages that are designed to perform valuable analysis of data of long-term monitoring data. Understanding these data and understanding how monitoring programs can be optimized are critical elements of effective site management and closure.
These software tools were developed to support federal clients such as the Air Force but can be used at any site to establish trends in concentration or mass over time. The goal is to provide users with technically sound, statistically validated approaches for demonstrating plume stability and remedy performance to optimize site management.
Key data management and statistical analysis tools developed by GSI include:
The Monitoring and Remediation Optimization System (MAROS) software was developed by GSI as a public-domain, data management and evaluation tool to improve long-term groundwater monitoring (LTM) programs. It was originally developed in 1998 on behalf of the Air Force Center for Engineering and the Environment (AFCEE; now known as the Air Force Civil Engineering Center) to support their portfolio of groundwater sites.
MAROS includes both: i) optimization routines to help determine the appropriate number of sample locations, sampling frequency, and laboratory analytes for site monitoring objectives, and ii) statistical analysis tools to evaluate plume stability conditions and remedy performance.
The latest version of this software (MAROS 3.0) includes several new and improved algorithms to review groundwater networks for optimized data collection. It is a Microsoft Access database application that employs simple statistics and decision frameworks to prioritize data collection efforts and link data to defensible site management decisions. The goal is to provide the user with more options to compare different network configurations. MAROS interactive, allowing the user more options to remove locations and review the resulting plume stability and concentration uncertainty metrics. Results generated from the software tool can be used to develop lines of evidence, which, in combination with professional judgment, can be used to inform site management decisions for safe and economical long-term monitoring of groundwater plumes. The MAROS tool can be used to help design and calculate remediation performance metrics and as a tool to evaluate progress toward site remedial goals.
Unlike many other software applications, MAROS uses the full analytical dataset over time, including both spatial (x,y coordinates) and temporal (all analyses over the time period of interest) data to evaluate contaminant plumes. The software can analyze data for up to five COCs and from 6 to over 100 wells in one run. The software contains modules that prioritize constituents, calculate summary statistics, determine temporal trends at individual wells (using both Mann-Kendall (MK) and Linear Regression (LR) techniques), and calculate plume stability metrics and their trends over time (i.e. total dissolved mass, center of mass and spread of mass). Spatial analysis of well distribution is performed using a Delaunay Triangulation/Voronoi Diagram spatial geometry algorithm. Optimization analyses include identification of redundant locations using a nearest neighbor and a qualitative approach exploiting statistics for spatial geometry, and estimation of plume concentration uncertainty to recommend new well locations and a sampling frequency module to recommend optimal sampling intervals based on the rate of concentration change.
Several features distinguish MAROS from other tools designed specifically to optimize networks:
The latest version of the software (MAROS 3.0) also has several new and improved features relative to the previous versions:
Users must have the ability to enable macros in Microsoft Access and Microsoft Excel. Users of later versions of applications that those listed above may experience some compatibility issues.
The current BETA version available is MAROS v3.0 BETA R352 released 28-SEP-2012.
Download the appropriate version of MAROS software for your version of Microsoft Office above. The download is a .ZIP compressed file. Extract the contents of the ZIP file to a folder. To start the MAROS 3 interface; open the MAROS 3.0 BETA.accdb database. Several other files will appear in the extracted folder. These files are required for MAROS to run.
Note: It is important that the .ZIP file is extracted and MAROS is not run from inside of the .ZIP file – this will cause errors when MAROS tries to access other files within the zip file. To extract the .ZIP file into a folder you typically will right-click on the .ZIP file and choose “Extract” from the context menu.
GSI provides the MAROS software free-of-charge and provides no technical support for its installation or usage. The MAROS FAQ is provided to answer the most common questions.
The GSI Mann-Kendall Toolkit is a free, simple, easy-to-use software tool to help environmental professionals efficiently conduct concentration trend analyses for any groundwater constituent. Programmed in the Microsoft Excel spreadsheet environment, the software employs the same Mann-Kendall plume stability methodology that was previously developed for the MAROS software (Aziz et al., 2003; AFCEE, 2004). This software tool can be used to demonstrate the plume stability condition (expanding, stable, or decreasing) and track the progress of remediation efforts, in a quantitative and consistent manner for consideration by both site managers and regulatory personnel.
Analysis of the trend of constituent concentrations in affected groundwater plumes has many applications in groundwater plume management and remediation. Regulatory programs typically require demonstrating that groundwater plumes are stable or controlled to confirm protective conditions. Monitored Natural Attenuation (MNA) is increasingly being used as a remedy for cleanup actions at sites with affected soils and/or groundwater. A primary line of evidence supporting MNA as a remedy is demonstration of a stable or shrinking plume condition, based upon historical monitoring data (ASTM 2004; USEPA 1999). Evidence for the discontinuation of extraction-based remedies often includes demonstration of stable or shrinking plumes after shut-down of extraction systems. Formal evaluation of plume stability can be accomplished using a variety of statistical methods, of which the Mann-Kendall protocol is one of the most commonly used and widely applicable tools.
The GSI Mann-Kendall Toolkit gives site personnel the capability to analyze time-series groundwater monitoring data for the purpose of quantitatively determining if the measured concentrations of a chemical are increasing, decreasing, or stable over time. This is based upon use of the Mann-Kendall statistical method. The software can be applied to data from monitoring points for which groundwater sampling and testing have been conducted at multiple episodes over time (i.e., time-series sampling) to evaluate the concentration trend of each chemical at each monitoring location.
Microsoft Excel 2000 or later versions. Note that the user must have the ability to enable macros in Microsoft Excel.
The zipped file contains the GSI Mann-Kendal Toolkit and the User’s Manual.
GSIMannKendall.zip (721KB)
It is important that the .ZIP file is extracted and the Toolkit is not run from inside of the .ZIP file – this will cause errors. To extract the .ZIP file into a folder you typically will right-click on the .ZIP file and choose “Extract” from the context menu.
Limited technical support is available through Shahla Farhat.
© Copyright 2023 GSI Environmental. All Rights Reserved.
© Copyright 2022 GSI Environmental. All Rights Reserved.
