{"id":707,"date":"2026-01-28T16:09:59","date_gmt":"2026-01-28T16:09:59","guid":{"rendered":"https:\/\/gaeatech.com\/wordpress\/?p=707"},"modified":"2026-03-28T03:18:12","modified_gmt":"2026-03-28T03:18:12","slug":"monitoring-well-design-environmental-investigations","status":"publish","type":"post","link":"https:\/\/gaeatech.com\/knowledge-center\/monitoring-well-design-environmental-investigations\/","title":{"rendered":"Designing a Monitoring Well for Environmental and Geotechnical Investigations"},"content":{"rendered":"\n<p>Designing a monitoring well involves a balance of technical requirements based on regulatory standards, the site&#8217;s hydrogeology, and the specific data objectives of the investigation (environmental or geotechnical). The design must ensure that the well provides a representative sample of the groundwater or an accurate measurement of the water level at the targeted depth.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-i-data-objectives-environmental-vs-geotechnical\">I. Data Objectives: Environmental vs. Geotechnical<\/h4>\n\n\n\n<p>The intended use dictates the design choices:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Environmental<\/strong>: The well must facilitate the collection of chemically unaltered groundwater samples. The materials used must be inert to the contaminants of concern (CoCs).<\/li>\n\n\n\n<li><strong>Geotechnical<\/strong>: The well (often a piezometer) primarily needs to quickly and accurately measure the water pressure or level (piezometric surface).<\/li>\n\n\n\n<li><strong>Combined Use<\/strong>: A standard monitoring well design often serves both purposes well.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-ii-key-design-components-and-material-selection\">II. Key Design Components and Material Selection<\/h4>\n\n\n\n<p>The standard monitoring well comprises four main components: the screen, the riser pipe, the filter pack, and the annular seals.<\/p>\n\n\n\n<p><strong>A. Screen and Riser Pipe Materials<\/strong><\/p>\n\n\n\n<p>Materials must be durable and chemically inert.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Standard Material<\/strong>: PVC (Polyvinyl Chloride): The most common choice due to its low cost, durability, and chemical inertness to most common contaminants (e.g., petroleum hydrocarbons, metals).<\/li>\n\n\n\n<li><strong>Alternative Materials<\/strong>: Stainless steel or Teflon are used for investigations involving specific contaminants that PVC might absorb (e.g., some pure-phase solvents like DNAPLs), though they are much more expensive.<\/li>\n\n\n\n<li><strong>Avoid<\/strong>: Do not use galvanized steel or black iron in environmental wells, as they corrode and introduce metals that skew sample results.<\/li>\n<\/ul>\n\n\n\n<p><strong>B. Well Screen Design<\/strong><\/p>\n\n\n\n<p>The well screen allows water to enter the well while keeping soil out.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Slot Size<\/strong>: Determined by the grain size of the surrounding aquifer material (from sieve analysis results). The slot size should retain 90% or more of the filter pack material. Common sizes are 0.010 or 0.020 inches.<\/li>\n\n\n\n<li><strong>Length<\/strong>: Typically 5 to 10 feet long.\n<ul class=\"wp-block-list\">\n<li><strong>Environmental<\/strong>: The screen should ideally straddle the water table interface or target the specific depth of the contaminant plume.<\/li>\n\n\n\n<li><strong>Geotechnical<\/strong>: A short screen is sometimes preferred to measure a very precise hydrostatic pressure at a specific depth (a piezometer design).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>C. Filter Pack (Gravel Pack)<\/strong><\/p>\n\n\n\n<p>The filter pack is placed around the well screen to prevent fine soil particles from clogging the screen slots.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Material<\/strong>: Clean, washed, uniform silica sand (often Grade 20-40 or 10-20).<\/li>\n\n\n\n<li><strong>Placement<\/strong>: The sand pack typically extends from the bottom of the borehole to approximately 1 to 2 feet above the top of the well screen.<\/li>\n<\/ul>\n\n\n\n<p><strong>D. Annular Seals and Grout<\/strong><\/p>\n\n\n\n<p>Seals are essential to prevent surface water infiltration and cross-contamination of different water-bearing zones.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Bentonite Seal:<\/strong> A transition seal of bentonite chips or pellets is placed immediately above the filter pack (typically 1\u20133 feet thick). This seal is hydrated to swell and create an impermeable barrier.<\/li>\n\n\n\n<li><strong>Grout (Cement-Bentonite Slurry)<\/strong>: The remaining annulus (space between the borehole wall and the riser pipe) is filled to the surface with a cement-bentonite grout using a tremie pipe (bottom-up application).<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-iii-finalizing-the-design\">III. Finalizing the Design<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Protective Casing:<\/strong> The well completion at the surface requires protection. This is typically a steel casing set in concrete (either above ground or flush with the ground in high-traffic areas).<\/li>\n\n\n\n<li><strong>Documentation<\/strong>: The final design must be documented on a detailed well construction diagram and log, which is a regulatory requirement (e.g., submission of a Well Record in Ontario).<\/li>\n<\/ul>\n\n\n\n<p>By carefully selecting materials and adhering to these design standards, the monitoring well becomes a reliable tool for both environmental characterization and geotechnical design.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-a89b3969 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/www.gaeatech.com\/winlog.php\" style=\"color:#fefbfb;background-color:#5e87be\">Learn more about our Boring and Well Log Solutions<\/a><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-related-articles\">Related Articles<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/the-complete-guide-to-drilling-and-sampling-for-environmental-and-geotechnical-investigations\/\">The Complete Guide to Drilling and Sampling for Environmental and Geotechnical Investigations<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/health-safety-plan-hasp-investigations\/\">Crafting an Effective Health &amp; Safety Plan (HASP)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/emergency-response-plan-drilling\/\">Crafting an Effective Emergency Response Plan for Environmental and Geotechnical Drilling<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/job-site-safety-checklist-geotechnical-drilling\/\">Essential Job-Site Safety Checklist for Geotechnical and Environmental Drilling<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/essential-steps-safe-drilling-urban-areas\/\">Essential Steps to Ensure Safe Drilling: Utility Clearances Before Boring Operations<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/urban-borehole-drilling-hazards\/\">Hazards to Consider Before Drilling Boreholes in Urban Areas<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/sampling-and-analysis-plan-comprehensive-guide\/\">Creating A Comprehensive Environmental Sampling And Analysis Plan: Your Guide To Success<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/conceptual-site-models-guide\/\">Mastering Conceptual Site Models: A Step-by-Step Guide to Understanding Contaminants<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/mastering-contaminants-of-concern-environmental-drilling\/\">Mastering Contaminants of Concern: Identification and Delineation<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/sampling-frequency-environmental-investigations\/\">Sampling Frequency: The Key to Effective Environmental Investigations<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/qa-qc-plans-environmental-investigations\/\">The Critical Role of QA and QC Plans in Environmental Investigations<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/determining-drilling-locations-environmental-investigations\/\">Strategic Considerations for Determining Drilling Locations in Environmental Investigations<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/selecting-containers-environmental-samples\/\">The Essential Guide to Selecting Containers and Preservatives for Environmental Soil and Groundwater Samples<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/soil-groundwater-sample-collection-guide\/\">Guide to Collecting and Storing Soil and Groundwater Samples for Environmental Investigations<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/sample-planning-geotechnical-investigations\/\">Mastering Sample Planning in Geotechnical Investigations: A Comprehensive Guide<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/geotechnical-drilling-location-insights\/\">Strategic Insights: Determining Ideal Locations for Geotechnical Investigation Drilling<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/selecting-drilling-rigs-environmental-investigations\/\">The Essential Guide to Selecting and Managing Drilling Contracts for Successful Geotechnical and Environmental Investigations<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/field-procedures-subsurface-investigations\/\">Mastering Field Procedures For Accurate Subsurface Investigations<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/calibrating-a-torvane\/\">Mastering the Art of Calibrating a Torvane for Accurate Measurements<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/calibrating-pocket-penetrometer\/\">Mastering Soil Testing: How to Calibrate a Pocket Penetrometer for Accurate Readings<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/mastering-standard-penetration-testing-methods\/\">Standard Penetration Testing: A Comprehensive Guide<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/calibrating-photoionization-detectors\/\">The Comprehensive Guide to Calibrating a Photoionization Detector (PID)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/classifying-soils-during-drilling\/\">Classifying Soils During Drilling: Your Comprehensive Guide<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/types-of-monitoring-well-protective-casings\/\">Types of Protective Casings used for Monitoring Wells<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/selecting-monitoring-well-filter-grout-materials\/\">Choosing the Best Filter and Grout Materials for a Monitoring Well<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/monitoring-well-screen-riser-material\/\">Choosing the Best Screen and Riser Pipe Materials for Monitoring Wells<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/gaeatech.com\/knowledge-center\/groundwater-monitoring-well-purging-sampling-procedures\/\">Standard Operating Procedures for Purging and Sampling Groundwater Monitoring Wells<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Designing a monitoring well involves a balance of technical requirements based on regulatory standards, the site&#8217;s hydrogeology, and the specific data objectives of the investigation (environmental or geotechnical). The design must ensure that the well provides a representative sample of the groundwater or an accurate measurement of the water level at the targeted depth. I. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":708,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[792,256],"tags":[273,372,373,371],"class_list":["post-707","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-borehole-data-management","category-drilling-and-sampling","tag-environmental-investigation","tag-geotechnical-assessments","tag-groundwater-quality","tag-monitoring-well-design"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Monitoring Well Design for Accurate Data Collection - Knowledge Center<\/title>\n<meta name=\"description\" content=\"Learn how to design effective monitoring wells for geotechnical and environmental investigations to gather accurate data.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gaeatech.com\/knowledge-center\/monitoring-well-design-environmental-investigations\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Designing a Monitoring Well for Environmental and Geotechnical Investigations\" \/>\n<meta property=\"og:description\" content=\"Learn how to design effective monitoring wells for geotechnical and environmental investigations to gather accurate data.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/gaeatech.com\/knowledge-center\/monitoring-well-design-environmental-investigations\/\" \/>\n<meta property=\"og:site_name\" content=\"Knowledge Center\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.linkedin.com\/company\/2663277\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-01-28T16:09:59+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-28T03:18:12+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/gaeatech.com\/knowledge-center\/wp-content\/uploads\/2026\/01\/obs_wells_datalogger.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"1067\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"GAEA Technologies\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"GAEA Technologies\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/monitoring-well-design-environmental-investigations\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/monitoring-well-design-environmental-investigations\\\/\"},\"author\":{\"name\":\"GAEA Technologies\",\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/#\\\/schema\\\/person\\\/940fb5fed6e95dd9d0ec1370207f5dba\"},\"headline\":\"Designing a Monitoring Well for Environmental and Geotechnical Investigations\",\"datePublished\":\"2026-01-28T16:09:59+00:00\",\"dateModified\":\"2026-03-28T03:18:12+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/monitoring-well-design-environmental-investigations\\\/\"},\"wordCount\":850,\"commentCount\":3,\"publisher\":{\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/monitoring-well-design-environmental-investigations\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/wp-content\\\/uploads\\\/2026\\\/01\\\/obs_wells_datalogger.jpg\",\"keywords\":[\"environmental investigation\",\"geotechnical assessments\",\"groundwater quality\",\"monitoring well design\"],\"articleSection\":[\"Borehole Data Management\",\"Drilling and Sampling\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/monitoring-well-design-environmental-investigations\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/monitoring-well-design-environmental-investigations\\\/\",\"url\":\"https:\\\/\\\/gaeatech.com\\\/knowledge-center\\\/monitoring-well-design-environmental-investigations\\\/\",\"name\":\"Monitoring Well Design for Accurate Data Collection - 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