{"id":726,"date":"2026-01-30T16:48:35","date_gmt":"2026-01-30T16:48:35","guid":{"rendered":"https:\/\/gaeatech.com\/wordpress\/?p=726"},"modified":"2026-03-28T03:17:29","modified_gmt":"2026-03-28T03:17:29","slug":"selecting-monitoring-well-filter-grout-materials","status":"publish","type":"post","link":"https:\/\/gaeatech.com\/knowledge-center\/selecting-monitoring-well-filter-grout-materials\/","title":{"rendered":"Choosing the Best Filter and Grout Materials for a Monitoring Well"},"content":{"rendered":"\n<p>When it comes to site characterization, your monitoring well is only as reliable as the materials surrounding it. Choosing the right filter pack and grout isn&#8217;t just about &#8220;filling the hole&#8221;\u2014it&#8217;s about ensuring hydraulic connectivity while preventing cross-contamination.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-filter-pack\">Filter Pack<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-1-filter-pack-material-selection\"><strong>1. Filter Pack Material Selection<\/strong><\/h4>\n\n\n\n<p>The filter pack (or sand pack) acts as a mechanical filter to keep fine formation particles out of your well screen while allowing groundwater to flow freely.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Material:<\/strong>&nbsp;Use&nbsp;<strong>clean, well-rounded, chemically inert silica sand<\/strong>. Avoid limestone or calcareous materials, as they can alter the pH and chemistry of your samples.<\/li>\n\n\n\n<li><strong>Sizing:<\/strong>&nbsp;The grain size must be matched to your well screen slot size. For example,&nbsp;<strong>20\/40 grade silica sand<\/strong>&nbsp;is typically paired with a&nbsp;<strong>0.010-inch (#10) slot screen<\/strong>.<\/li>\n\n\n\n<li><strong>Standard Compliance:<\/strong>&nbsp;Follow&nbsp;<a href=\"https:\/\/www.astm.org\/d5092_d5092m-16.html\" target=\"_blank\" rel=\"noreferrer noopener\">ASTM D5092<\/a>&nbsp;guidelines for design and installation to ensure representative sampling.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-2-filter-pack-required\">2. Filter Pack Required<\/h4>\n\n\n\n<p>For a typical&nbsp;<strong>2-inch (2.375&#8243; OD) PVC monitoring well<\/strong>, the amount of filter pack sand required depends on the diameter of the borehole created by your drilling method (e.g., hollow stem auger or sonic).&nbsp;<\/p>\n\n\n\n<p>The table below provides the volume per linear foot of the&nbsp;<strong>annular space<\/strong>&nbsp;(the gap between the casing and the borehole wall) where the sand is placed.&nbsp;<\/p>\n\n\n\n<p><strong>Filter Pack Volume for 2-inch Monitoring Well<\/strong><\/p>\n\n\n\n<p><em>Calculated for 2.375&#8243; OD Casing<\/em>&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Borehole Size (in)&nbsp;<\/th><th>Volume per Foot (<img decoding=\"async\" src=\"blob:https:\/\/gaeatech.com\/defb0980-7f1d-44b1-bfed-84badad3548f\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><mrow><mi>f<\/mi><msup><mi>t<\/mi><mn>3<\/mn><\/msup><\/mrow><annotation encoding=\"text\/plain\">f t cubed<\/annotation><\/semantics><\/math>)<\/th><th>Volume per Foot (Gallons)<\/th><th>Approx. Bags per 10 ft*<\/th><\/tr><tr><td><strong>4.0<\/strong><\/td><td>0.056<\/td><td>0.42<\/td><td>1.2<\/td><\/tr><tr><td><strong>6.0<\/strong><\/td><td>0.166<\/td><td>1.24<\/td><td>3.5<\/td><\/tr><tr><td><strong>8.0<\/strong><\/td><td>0.318<\/td><td>2.38<\/td><td>6.4<\/td><\/tr><tr><td><strong>10.0<\/strong><\/td><td>0.512<\/td><td>3.83<\/td><td>10.3<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>*Based on standard <a target=\"_blank\" rel=\"noreferrer noopener\" href=\"https:\/\/kodiak.ca\/estimator\/supplies-calculation\/\">50-lb bags of silica sand<\/a>, which typically have a volume of ~0.5<\/em><\/p>\n\n\n\n<p><strong>Key Planning Factors<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Total Height:<\/strong>&nbsp;Remember to calculate for the entire &#8220;sand column,&#8221; which includes the length of the screen plus at least&nbsp;<strong>2 feet above the top of the screen<\/strong>&nbsp;to prevent grout infiltration.<\/li>\n\n\n\n<li><strong>The &#8220;Washout&#8221; Factor:<\/strong>&nbsp;In unstable formations like loose sand or gravel, the borehole may be wider than the drill bit. It is standard practice to add a&nbsp;<strong>10%\u201320% contingency<\/strong>&nbsp;to your order.<\/li>\n\n\n\n<li><strong>Centering:<\/strong>&nbsp;Always use&nbsp;<strong>centralizers<\/strong>&nbsp;in boreholes larger than 4 inches to ensure the filter pack is evenly distributed around the screen, preventing &#8220;thin spots&#8221; that could allow sediment into the well.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-seal-and-grout\">Seal and Grout<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-1-grout-and-sealing-materials\">1<strong>. Grout and Sealing Materials<\/strong><\/h4>\n\n\n\n<p>Grout prevents surface water or fluids from different aquifers from migrating down the well&#8217;s annular space.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Bentonite Seal:<\/strong>&nbsp;A transition seal of&nbsp;<strong>hydrated bentonite chips or pellets<\/strong>&nbsp;(at least 2 feet thick) must be placed directly above the filter pack to prevent grout from infiltrating the screen area.<\/li>\n\n\n\n<li><strong>Main Grout:<\/strong>&nbsp;The remaining annulus is usually filled with a&nbsp;<strong>bentonite-cement slurry<\/strong>&nbsp;or&nbsp;<strong>neat cement grout<\/strong>. Use&nbsp;<a href=\"https:\/\/www.mdeq.ms.gov\/wp-content\/uploads\/2017\/06\/Appendix-M---Monitor-Well-Installation-SOP.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">Type 1 Portland Cement<\/a>&nbsp;mixed at a ratio of approximately 6 gallons of water per 94-lb bag to achieve a density of 15 lbs\/gal.<\/li>\n\n\n\n<li><strong>Caution:<\/strong>&nbsp;Avoid using cement near the screen in sensitive chemical monitoring, as the high heat of hydration can damage PVC and skew chemical results.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-2-seal-and-grout-required\">2. Seal and Grout Required<\/h4>\n\n\n\n<p>To complete your well design, you\u2019ll need both the&nbsp;<strong>bentonite transition seal<\/strong>&nbsp;(placed immediately above the filter pack) and the&nbsp;<strong>main annular grout<\/strong>&nbsp;(extending to the surface).<\/p>\n\n\n\n<p>For a standard&nbsp;<strong>2-inch (2.375&#8243; OD) monitoring well<\/strong>, use the table below to estimate material needs per linear foot of the borehole.<\/p>\n\n\n\n<p><strong>Grout and Seal Material Estimates (2&#8243; Well)<\/strong><\/p>\n\n\n\n<p><em>Calculations based on 2.375&#8243; OD Casing<\/em><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Borehole Size&nbsp;<\/th><th>Vol. per Foot <br>(<img decoding=\"async\" src=\"blob:https:\/\/gaeatech.com\/4561b297-1664-4098-bd98-ff5b071a4651\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><mrow><mi>f<\/mi><msup><mi>t<\/mi><mn>3<\/mn><\/msup><\/mrow><annotation encoding=\"text\/plain\">f t cubed<\/annotation><\/semantics><\/math>)<\/th><th>Bentonite Chips (Bags\/10 ft)*<\/th><th>Grout Slurry (Gal\/10 ft)**<\/th><\/tr><tr><td><strong>4.0 inch<\/strong><\/td><td>0.056<\/td><td>0.8<\/td><td>4.2<\/td><\/tr><tr><td><strong>6.0 inch<\/strong><\/td><td>0.166<\/td><td>2.4<\/td><td>12.4<\/td><\/tr><tr><td><strong>8.0 inch<\/strong><\/td><td>0.318<\/td><td>4.5<\/td><td>23.8<\/td><\/tr><tr><td><strong>10.0 inch<\/strong><\/td><td>0.512<\/td><td>7.3<\/td><td>38.3<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>*Based on standard <a href=\"https:\/\/aquaterraresource.ca\/wp-content\/uploads\/2023\/02\/HOLEPLUG.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">50-lb bags of bentonite chips<\/a> (approx. 0.7<\/em> <em> cubed \ud835\udc53\ud835\udc61 per bag).<\/em><br><em>**Based on <a href=\"https:\/\/www.sfwmd.gov\/sites\/default\/files\/documents\/well_construction_grouting_info.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">US liquid gallons<\/a> of mixed slurry.<\/em><\/p>\n\n\n\n<p><strong>Critical Application Guidelines<\/strong>&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The Bentonite Seal:<\/strong> Most regulations require a minimum <strong>2-foot thick seal<\/strong> of hydrated bentonite pellets or chips above the filter pack. If you are working in a 6-inch borehole, you will need roughly <strong>half a bag<\/strong> of chips for this 2-foot interval.<\/li>\n\n\n\n<li><strong>Grout Mix Ratio:<\/strong> For a standard neat cement grout, mix <strong>one 94-lb bag of Type 1 Portland Cement<\/strong> with no more than <strong>6 gallons of clean water<\/strong>. This produces roughly 1.1 <img decoding=\"async\" src=\"blob:https:\/\/gaeatech.com\/5aa88652-80ac-49d3-ab8c-f97d5b05e3e3\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><mrow><mi>f<\/mi><msup><mi>t<\/mi><mn>3<\/mn><\/msup><\/mrow><annotation encoding=\"text\/plain\">f t cubed<\/annotation><\/semantics><\/math> of slurry.<\/li>\n\n\n\n<li><strong>Placement Method:<\/strong> Always use a <strong>tremie pipe<\/strong> to pump grout from the bottom up. This ensures the grout displaces any standing water or drilling fluids and prevents &#8220;bridging&#8221; (air pockets) that could compromise the seal.<\/li>\n\n\n\n<li><strong>Hydration Time:<\/strong> Allow the bentonite seal to hydrate for at least <strong>30\u201360 minutes<\/strong> before pumping the cement grout to prevent the heavy grout from sinking into the filter pack.&nbsp;<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\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:#f9f9f9;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\" 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Choosing the right filter pack and grout isn&#8217;t just about &#8220;filling the hole&#8221;\u2014it&#8217;s about ensuring hydraulic connectivity while preventing cross-contamination. Filter Pack 1. Filter Pack Material Selection The filter pack (or sand pack) acts as a mechanical [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":727,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[792,256],"tags":[381,382,385,384,386,383],"class_list":["post-726","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-borehole-data-management","category-drilling-and-sampling","tag-astm-d5092","tag-bentonite-grout","tag-filter-pack-sand","tag-monitoring-well-construction","tag-well-annulus-calculation","tag-well-sealing"],"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>Choosing the Best Filter and Grout Materials for a Monitoring Well - Knowledge Center<\/title>\n<meta name=\"description\" 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