Water Resources
EnviroSense's employees have extensive experience in aquifer analysis, water supply development, and ground water management. EnviroSense provides the following services in the area of water resources:
- Ground Water Supply Investigation and Test Drilling Supervision;
- Comprehensive Aquifer Testing and Analysis;
- Wellhead Protection Area Delineation;
- Aquifer and Well Field Computer Modeling; and
- Ground Water - Surface Water Influence Evaluations
Water Resources services which we provide include:
Ground Water Supply Investigation and Test Drilling Supervision
EnviroSense personnel have extensive experience with locating unconsolidated aquifers and bedrock aquifers suitable for development as public water supplies. Unconsolidated aquifers, ranging in yield from under 100 gallons per minute (gpm) to over 1,000 gpm have been identified by EnviroSense staff for projects located in New Hampshire, Massachusetts, Maine, and New York. Investigatory techniques include reviews of published hydrogeological data, geophysical surveys, and test drilling surveys. Bedrock aquifer investigatory techniques also include lineament analysis and geologic field mapping of fracture orientations. Test drilling techniques include 2.5-inch diameter drive and wash, large-diameter cable tool drilling, mud rotary and reverse rotary drilling, dual-rotary using air-lift sample retrieval, and hollow-stem auger drilling.
Comprehensive Aquifer Testing and Analysis
EnviroSense employees have extensive experience in conducting aquifer pumping tests and analyzing aquifer test data. Testing methods include step-rate pumping tests, short-term constant-rate pumping tests (24 hours), long-term constant rate pumping tests (48, 72, and 120 hours), and recovery tests.
Analytical data are used to determine well and aquifer characteristics such as well efficiency, specific capacity, aquifer transmissivity, aquifer storage coefficient, recharge rate, cone of depression, radius of influence, and induced infiltration rates.
Wellhead Protection Area Delineation
EnviroSense employees have extensive experience delineating wellhead exclusion areas, aquifer contribution zones, and watershed area delineations under Massachusetts, Connecticut, New Hampshire, Maine, and New York guidelines and regulations as part of public water supply permitting projects.
Aquifer and Well Field Computer Modeling
EnviroSense employees have utilized computer modeling to assist in aquifer/wellfield analyses, wellhead protection area delineations, and water supply permitting. Models range in complexity from spreadsheet-type semi-quantitative modeling, to intermediate computer models such as AQTESOLV, to two-dimensional and three-dimensional models such as MODFLOW. Computer modeling has proven invaluable in the completion of Connecticut Diversion Permit Applications and Level A Mapping reports, and for evaluating such phenomena as the effects of positive and negative recharge boundaries on long-term well yields under varying long-term climatic events.
Ground Water - Surface Water Influence Evaluations
EnviroSense employees have combined aquifer testing, data analysis, and computer modeling to assess the potential effects of surface water bodies on the water quality and projected yield of public water supplies. These studies are frequently supplemented by microparticulate analyses in order to determine whether a public water supply qualifies as being under the influence of a surface water body, per state and federal regulations. These studies are typically conducted to help insure long-term water quality.
The EnviroSense team has over 20 years of experience assessing aquifer projects throughout the Northeast. If you are tasked with evaluating local water resources and are in need of additional support and further analysis, contact EnviroSense today to speak with our experts.