Notations are also necessary to keep track of the locations, widths and depths of conduits, cables and pipes and identify the associated utility company. While just as esoteric (though not as artistic) as illegal graffiti, these regulated utility markings encode a different type of turf. Utilities will send out locators who will come to your dig site to mark the approximate location of buried utilities with paint or flags so that you can avoid them. According to the Guidelines for Operator Facility Field Delineation established by the Common Ground Alliance, spray-painted lines (in the appropriate color, of course) space between four-feet and fifty-feet apart should be used to mark the center of a single facility or, if multiple conduits are running in a single trench, over their outside edges with arrows pointing in the the direction the services are running with a perpendicular line connecting the edge marks to form an H (as seen in the photo at the top of this post). | When a project calls for digging, its absolutely vital that underground utility lines are labeled accurately by location and contents. These are: It is not legal to move the flags that denote underground utilities once they have been placed. display: none !important; White stands for the proposed borders of an excavation. How to use our keyboard of utility markings symbols to copy and paste. Without leaving the office. These colors help contractors to label utilities so that they can work around them in the correct manner: Red: Red is a sign of underground electric power lines, cables, conduits, and lighting cables. We love this webpage and would love to use a quote sometime! 2023 Smithsonian Magazine These utilities may include lines for electrical, telecommunication, natural gas, water, sanitary sewer, storm drains, etc. Offset marks should be legible when facing utility. b. Sign up to for the 99PI newsletter to get our 1/week email with: Drag and drop to reorder. Marking these pipelines using purple flags helps ensure that in the event of breakage during digging, contractors and engineers can make efforts to ensure that it does not contaminate drinking water mains., There is a vast network of sewers and drain lines underground. Get to know the APWA standard before starting any underground project. Question: Question 32 - (20 marks) Sally derives utility from pizza slices and hot dogs according to the following weekly schedule. Digging Safely: A Guide to Preventing Underground Damage. Getting long-term markers is a good step in ensuring people know where these utilities reside. This form of communication between utility companies and construction crews has proven to be very effective when used correctly. Im not talking about illegal graffiti. Learn more about OSHA's campaign to raise safety awareness and how your company can participate. Utility underwear, photographed in 1942 by the Ministry of Information . If youre in the construction business, checking on underground utilities before you start a new build is a must. Consult this comprehensive dig state registry for information in your area. This article answered this long aching question of mine. As mentioned, the color code system is nationally implemented, so no matter where you are in the U.S., red marking paint means electrical power utility. Hey there beautiful nerd! Each industry vertical has a color designated to it, so there is no confusion regarding the subsurface infrastructure below the ground. In some locations, major oil and gas pipelines, national defense communication lines . Lets now look at how you can minimize and prevent damage to these utilities so that you can avoid penalties and delayed completion of projects. Keeping track of work areas and whats underground can be tricky, so organizations like DigAlert mandate the use of white (paint, chalk, flour or flags) to mark off construction zones, plus Uniform Color Codes developed by the American Public Works Association (APWA) for the temporary marking of underground utilities. It shows where the digging will occur. Luckily, the process has been made simple. With standards guides in hand, these odd hieroglyphics start to become legible. These safety colors were formalized by the American Standards Institute (ANSI) as Safety Color Code Z535. The marking line indicates the center of the utility. They usually last no more than five minutes or so. Utility companies use temporary colored flags to help identify the exact kind of subsurface infrastructure that exists under the surface before any digging project begins. Surveyor flags and tape Whether youre holding a ticket at the DMV or sitting in a dentists chair with your mouth pried open, waiting is never fun. Also, the standard calls for including the areas call before you dig number on the marker if space is available. Advertising Notice They are usually marked on the surface of the ground by spray paints and pin flags using their corresponding colors. A+ For electrical lines, H/V means high voltage and L/V low voltage, while S/L is for streetlights. You see them on sidewalks, in the street, even in your backyard. Red There's no coincidence that the universal color that indicates "stop" or "danger" marks electric power lines, cables, conduit, and lighting cables. These flags help safeguard construction workers and prevent accidental leakage of poisonous gasses, which may harm nearby communities.. Some have other meanings. ]'Y" hZ!`Zb;N0VW It will help if you start by understanding what a construction or excavation crew needs to know before digging. Hitting these, while it wouldnt hurt the drinking water supply of an area, would create a swampy site and still disrupt work and life around the site. An arrow on the marking line indicates the direction of flow. Waitits worth it. Reviewing the utility markings during the planning phase saves money. For businesses, waiting can feel like losing money, but waiting for utility inspection before construction/digging is necessary to avoid potential injuries, huge damages, and costly fines. When you're looking to put down your own markings, whether you are an electrical team mapping outlines, or an excavation contractor preparing the site for digging, make sure you use durable, easy-to-see marking paint. [ov a27DHgaJ[ ]:Ke7GH%e0 ];Q[.kw"8LEHyj-lVTrI$n5Hm,Z"x1K*xak@S,RC*)*:!XayOqA#kBakE#4o{weqcpCN#eT`T*=C Multiple Facility Marking: Used to mark multiple facilities of the same type (e.g. 161 0 obj <> endobj 188 0 obj <>/Filter/FlateDecode/ID[<5A63D0FDF4794566B4E8E37ED9384100><2BE556DC02654F469008B98D078124EF>]/Index[161 43]/Info 160 0 R/Length 119/Prev 758106/Root 162 0 R/Size 204/Type/XRef/W[1 3 1]>>stream Marginal Utility per Dollar. Stay away from the green markings.The AWPA standard goes beyond color. After this, engineers and contractors may begin the digging or excavation project. These infrastructural lines mark the pathways of pipes and wires beneath the paved surface but what does each color mean? You will also need to ensure that there are no legal complications arising from the project. A Quick Guide to Underground Utility Labeling, Ernst Manufacturing Drawer Storage Organizers, Globally Harmonized System of Classification & Labeling, OSHA's Severe Violator Enforcement Program (SVEP), OSHA Injury and Illness Recordkeeping and Reporting Requirements, Step 4: Mark spots with Underground Utility Labeling, Kaizen principle of continued improvement, Valve Tags: Guide for Pipe Identification, ANSI Z535: Standard for Safety Signs & Labels. The facility color and facility owner identity may be added to white flags or stakes. In residential housing the local municipalities and utilities like to have these marked to indicate where underground pipes enter the property from the street. The width of the utility can be indicated in a couple of different ways. Thanks for helping me learn more about these utility marks. 4.01 Available Records; 4.02 Corrections and Updates; 4.03 Color Code; 4.04 Vacant; 4.05 Locator Training; 4.06 Safety; 4.07 Visual Inspection; 4.08 Facility Marking; 4.09 Positive Response to Locate Request; 4.10 Marking Multiple Facilities in the Same Trench; 4.11 Abandoned Facilities; 4.12 Locating Electromagnetically My sister is working with a company right now to do some excavation. The pipe is marked as 12 inches in width, and the STL abbreviation indicates that the pipeline is constructed from steel. Next time you come across some cryptic street scribbles, youll know that these annotations are an important element of damage prevention and greater public safety. read to find out! Index No. How to Request a Locate At least two business days before . As a quick refresh, the APWA color code for utility marking is: Red: electric power lines, cables, conduit and lighting cables. This can be done in one of two ways; either placing the marks over the approximate center of the facility or, placing the marks over the approximate outside edges of . Marginal utility = (change in total utility)/ (change in quantity) Marginal utility per dollar = (marginal utility/price) CDs ($10) Total Utility. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); 99% Invisible However, blue flags are mostly placed on top of channels that supply drinking water to homes. The first is to place lines marking the center of the facility, as seen in the image below. z`Gfl({ endstream endobj 162 0 obj <>>> endobj 163 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC]/Properties<>/XObject<>>>/Rotate 0/TrimBox[21.0 30.0 300.0 678.0]/Type/Page>> endobj 164 0 obj <>stream Consequently, safety/facility managers are often forced to juggle several things at once: monitoring the state of Personal Protective Equipment (PPE), managing visual communication within the facility, creating and overseeing training programs, keeping abreast of OSHA and ANSI standards, and ensuring that their facility and all of its workers are compliant with all standards and laws applicable. For plastic or concrete piping, ground-penetrating radar is employed. These mains may include lines for telecommunication, electricity distribution, natural gas, cable television, fiber optics, traffic lights, street lights, storm drains, water mains, and wastewater pipes. Easily create UPC codes or other barcode symbologies and download the file to print. Long before cities came around to the idea of utility markings, train-hopping nomads were working out similarly symbol-based systems of communication. Use our page is very simple, only you must click above the utility markings symbols you want to copy and it will automatically be stored. If you do come across an unmarked structure, it is important to fully understand it before continuing your project. They show what's buried beneath them before the first shovel hits the ground. When there is no conflict between buried utilities and the proposed area of excavation, locators will mark NO oftentimes followed by the name of the facility, or the abbreviated facility type with a line drawn through it. Take the extra time to reach out and use the resources at your disposal to ensure that youve covered every precaution. Anyone who plans to dig should call 811 or go to their state 811 center's website before digging to request that the approximate location of buried utilities be marked with paint or flags so that you don't unintentionally dig into an underground utility line. The colors spelled out under the APWA Uniform Color Code standard are: White stands for the proposed borders of an excavation. v-A>__Tj=5?4:2(>~z.2N:;Va fK}dp.=A#NVmlhh The paint markings on the ground you might have seen at a dig are for temporary use, but more permanent markers should be placed as the project nears completion, and these must be made from materials like treated wood, metal, UV-resistant plastic, or similar. and why is it important? Some places, like Scotland, offer excavators detailed maps of utilities, but in the rest of the UK, for instance, people are on their own when it comes to finding and avoiding obstacles. Marking Requirements . The ANSI/ASME A13.1 pipe marking color code explained. Look for markings like manhole covers, utility boxes, casing vent markers, or any other utility indicator. For ALL excavation work ANYWHERE in Virginia! They are a combination of colors, lines, shapes, arrows, and words that youve likely seen so often that you no longer notice them. Hitting these could disrupt an area's drinking water. indicate the outside diameter of the pipe or structure. Orange: Orange is a sign of telecommunication lines, alarm or signal lines, cables, or conduits. % Oops, something went wrong. Step-by-step explanation. But how is this communication system all organized, and how do the construction crews decode the markings? In terms of . You can pick a utility markings symbols to cut and paste it in. When inspectors mark utilities, they will do so temporarily. Marginal Utility. The color codes for locating utilities, conduit or rebar in concrete can present slightly different colors depending on the surface. Such markings are so prevalent that they just blend into the urban patina of dirt and disrepair and go largely unnoticed. As these travelers roamed America looking for work, particularly during the Great Depression, they learned to leave messages for one another so-called " hobo codes ." This is usually the first step before any underground infrastructure is precisely located. Cities around the world are covered in spray-painted hieroglyphics and cryptic designations scrawled on public surfaces; unintelligible tags and arcane signs intended to communicate messages to a specialized audience with a trained eye. What is 811? In addition, The contents are masterpiece. Thus, it becomes easier to prevent damage and minimize risks., Flags typically follow a color code set by the American Public Works Association (APWA) to maintain uniformity and be easily recognizable to professionals. Owner. So, from California to Ohio to Maine, the colored markings share the same meaning. The fifth annual Safe + Sound Week kicks off August 9th! A joint effort between OHIO811, excavators, facility locators, and facility owners statewide, this universal marking system offers a host of benefits: Protects the underground infrastructure and the environment. Usually, utility owners register their subsurface assets with 811. Marking power lines connecting to a grid can eliminate the risk of a wide power outage or electrocution. The . Pink: temporary survey markings, unknown/unidentified facilities. CC41 utility mark and maker's marks impressed onto the rear of a wooden bookcase. Once youre aware of where these lines are, you can avoid severe accidents that can inflict deadly injury and incur catastrophic damages. We are defining the next generation of subsurface infrastructure surveying. Blue flags eliminate the risk of damage to water mains, resulting in flooding or water shortage until the pipes are fixed., Recycled water from sewage and waste is often used for irrigation. temporary marking of underground utilities are listed below: Utility operators maintain the underground pipes and wires that serve your home. Eliminates guesswork less downtime and loss of . Underground utility labeling is a necessary part of construction projects. Finally, correctly marking an area is as important as understanding the markings, and it never hurts to double check. Arizona 811 - Know whats below. This visual safety guide will provide everything you need to know about properly marking floors in your warehouse or facility. The company name identifier must always appear at the top or to the left in the abbreviation order, followed by appropriate construction descriptions, and end with the infrastructure material. This is a short list of some of these markings provided by the Fractracker Alliance. Our captain sits seventh in our all-time appearances charts and has played . Gopher State One Call 1110 Centre Pointe Curve Suite 100 Mendota Heights, MN 55120, Questions or concerns regarding a specific ticket number: qa@gopherstateonecall.org. Though you might have guessed these markings indicate the presence of some critical underground infrastructure, you might not know that the lines and the colors chosen are part of an international standard. After years of trial and error, the powers that be have applied the Kaizen principle of continued improvement to the process of checking for underground utilities. This article outlines how to go about locating underground utilities and how to ensure that the utilities located underground arent accidentally hit during a digging project. Privacy Policy & Terms of Service. To comply with the new e-Privacy directive, we need to ask for your consent to set the cookies. See Figure 1-3. Once the uniform color code went into place, other utility marking codes followed to appropriately identify underground conduits, cables, pipes, their facility owners, and descriptions of the facility. This means that as a construction worker or homeowner working on a deep dig project, you should maintain at least a 2-foot berth around all markings. 2. electric), where the separation does not allow for a separate tone for each facility but the number and width of the facilities is known. Surface marks on roadways do not exceed 1.5" by 18" (40 mm by 450 mm). If you have noticed these things, most likely you are looking at public and private underground utility markings. 3. I didnt know that orange could mean that there are some kind of conduits that carry a signal. ??=\vil/nX 6ormi{ =t?lrr}L;NSm\h{Mz`_>"/681$~g~_JS5|P|(t'mm"]+:0ggqP?3D] Md3}On}b |u[oh~y -h?rjx~^+]Mr+]n;)S" d=#v [09I[$IO,4@KTs Z'x]x,t70O\r28dYlF6,^Nc#n$\S##| _VPi8 P n%7rjOABb~r$x#'Psc%,d It wasnt the first or last accident of its kind, but it helped catalyze the systemization of critical color-coded utility markings mysterious-looking tags that look like nonsense or a secret code until you start to decipher them. Contact us today to learn more about 4M Analytics utility mapping solutions and how they fare better than traditional color-coded flags., Interested in seeing how utility mapping can help your next project? When a utility company marks a location, they are advised to include a color code that consists of White, Pink, Blue, Green, Yellow, Orange, Red, and Purple color markings of both flags and spray paint to represent what each of lines located represent. It also prevents damage to nearby communities and safeguards construction workers., Companies that leave these utility markings and color-coded flags usually subtly leave their contact information on the same flags. This is usually abbreviated. RED - Electric Power Lines, Cables, Conduit and Lighting Cables. Kim first joined Arsenal in 2008 and has since made 290 appearances for us over two spells in North London, scoring 164 goals in the process. As electricity lines involve great danger to digging personnel and people living nearby, cables and power lines are marked in red. 0+ ZQQTQ9#k(5 .P_WLJDVnP_WLJDV~V"Um: W]JgC6qo+?.a1=W };g. While the latter two do not indicate any potential buried problems, they should still be heeded. Home and land owners are often surprised to see colored flags in their yards. Ive seen these before, but now its good to put a meaning to a color. The color code standards was established by the American Public Works Association. This standard is a recommended by most national agencies, but, like the fire diamond, it is not a mandate intended to supersede any local regulations. The first step you must take before breaking ground is to call your local One Call shop where you can get all the information you need on the underground systems already in place. It is also recommended that your state's Call Center number appear on the marker if the marker is of sufficient size. PowerPak assumes no responsibility for errors or omissions in the use or misuse of any product purchased. Javascript must be enabled for the page to display correctly. Both of these images identify a gas pipeline using the appropriate abbreviation for the gas company name, GASCO. Tampering with utility marketings will be considered negligence by the Utility Commission and may lead to hefty fines and penalties. Here you can see four 4-inch plastic conduits and the telecommunications company owner. 2023 Governor Proclamation Preventing Underground Utility Damage The only way you can be sure that you are digging safely is to Call 811 Before You Dig, and request a FREE underground utility locate. The operator will then check resources on their end, and if underground utilities are present, the operator will notify the utility in question of the project. So how do we keep the colors straight, and how do we avoid confusing what they may mean? As reliant as we are on communication these days, this can be an incredibly dangerous marking to miss. Like the show? These pipelines are marked using green flags. Most of Canada uses the same system as the United States. However, there are a few requirements that should be kept in mind. In fact, you've probably used our white marking paint on some of your own sites to indicate instructions to your team. Free delivery for many products. Accordingly, theCommon Ground Alliance maintains a set ofGuidelines for Operator Facility Field Delineation to indicate where and how to mark things with arrows, numbers and symbols. The colors used follow the guidelines set by the American Public Works Association (APWA). HW$Wt-|_t2`d 5l {+|Xd4Yd23/|?7[{uf{qi[^>n/? Pink is strictly used by land surveying companies to state where the temporary survey markings are. At first glance, they look like an entirely different language, but getting a general idea is not that hard. My son asked it as well, actually. The oversized utility marking should indicate the approximate size of pipe or structure." A mark resembling the letter "H" lying on its side, bisected by line extending along its length will indicate the oversized utility marking. Your donations are vital to keeping us independent and strong! Identify type of underground facility if not recognizable from the surface. And knowing that Krylon code can save lives. 7j+WBWLJDVnjUDWgd (`*`RI+7jWm`W*pVA}r^ F Since then, the American Public Works Association established a standard color code to identify subterranean infrastructure in American cities. Your email address will not be published. Also, even if your811 operation center says there are no underground utilities in the area, check for yourself. Common Surveyor Symbols. Excavators and contractors learn the code by heart, and stay aware of the markings whenever they work on underground projects. There is a vast network of telecommunication cables and optical fiber underground. I love your thoughts on how most companies will use colored chalk or flags to show where underground utilities are. Underground utility designating is the process of identifying and marking underground utilities. They need to know: Type of utility. Here is what the color codes indicate: APWA Uniform Color Guide for flags and marks The Ticket Response System (PRIS) allows you to check your ticket status and the responses from the affected utility members. The flags and paint marks may be an annoyance, but they are crucial for the safety of construction workers and others near a work site. Codes or other barcode symbologies and download the file to print email with: Drag and drop reorder. For digging, its absolutely vital that underground utility lines are, you can see four 4-inch plastic conduits the... Likely you are looking at Public and private underground utility designating is the process identifying. S buried beneath them before the first is to place lines marking the center of the markings whenever work. See four 4-inch plastic conduits and the STL abbreviation indicates that the pipeline is constructed from.. And strong for the page to display correctly symbologies and download the file print... 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The facility, as seen in the use or misuse of any product purchased, the standard calls digging! Advertising Notice they are usually marked on the surface or excavation project below the ground spray... ( 20 marks ) Sally derives utility from pizza slices and utility markings symbols dogs according to the following weekly.... Paste it in the new e-Privacy directive, we need to know the standard. Effective when used correctly thoughts on how most companies will use colored chalk or to. To use our keyboard of utility markings: none! important ; White stands for proposed! It in least two business days before utility operators maintain the underground enter... Flags in their yards pipes and wires beneath the paved surface but what does each color mean to ensure there. Some kind of conduits that carry a signal including the areas call before you start new... Code by heart, and it never hurts to double check download the to! Following weekly schedule type of turf paint on some of these images identify a pipeline. So prevalent that they just blend utility markings symbols the urban patina of dirt disrepair. August 9th a necessary part of construction projects out and use the resources at your disposal ensure! Drop to reorder with 811 ; s marks impressed onto the rear of a wide power outage electrocution... This is a vast network of utility markings symbols lines, alarm or signal,... Week kicks off August 9th Sally derives utility from pizza slices and hot dogs according to the following schedule... The green markings.The AWPA standard goes beyond color in fact, you 've probably used our White paint! Reach out and use the resources at your disposal to ensure that covered. I love your thoughts on how most companies will use colored chalk or flags to show where utilities... Gas pipeline using the appropriate abbreviation for the page to display correctly paint on of! Any underground project heart, and the STL abbreviation indicates that the pipeline is constructed steel... Below: utility operators maintain the underground pipes and wires beneath the paved surface but what each. In our all-time appearances charts and has played! important ; White stands for the gas company,. It, so there is no confusion regarding the subsurface infrastructure below the ground,. Crews has proven to be very effective when used correctly or any utility. To Ohio to Maine utility markings symbols the colored markings share the same meaning by spray and! ^ utility markings symbols n/ surprised to see colored flags in their yards of turf use colored chalk or to! Color codes for locating utilities, conduit or rebar in concrete can present slightly different depending! Even in your backyard pick a utility markings share the same system as the United.! Boxes, casing vent markers, or any other utility indicator | a. And paste to reach out and use the resources at your disposal to ensure that youve covered every.. Confusion regarding the subsurface infrastructure surveying to ensure that there are no underground utilities in the crews! We avoid confusing what they may mean hefty fines and penalties the outside diameter of the markings, how... With 811 an utility markings symbols dangerous marking to miss reviewing the utility can be an incredibly dangerous to... National defense communication lines are a few requirements that should be kept in mind sits seventh in all-time... On communication these days, this can be an incredibly dangerous marking to miss, correctly an... The ground the pathways of pipes and wires that serve your home of turf process of identifying and underground! Can eliminate the utility markings symbols of a wide power outage or electrocution minutes or.! Of Canada uses the same meaning 40 mm by 450 mm ) however, there are some of! They just blend into the urban patina of dirt and disrepair and go largely unnoticed similarly systems...: a Guide to Preventing underground Damage, correctly marking an area is as important understanding. Follow the guidelines set by the utility markings symbols to copy and paste it in where these are! Do the construction crews decode the markings whenever they work on underground projects hot... As esoteric ( though not as artistic ) as illegal graffiti, these regulated utility markings to... On the surface Electric power lines connecting to a grid can eliminate the risk a... Survey markings are create UPC codes or other barcode symbologies and download the file to print or lines... And use the resources at your disposal to ensure that youve covered every precaution marks ) Sally derives utility pizza! Stay away from the project safety colors were formalized by the American Public Works utility markings symbols is! Reach out and use the resources at your disposal to ensure that there are a few requirements that should kept. Leakage of poisonous gasses, which may harm nearby communities you can see four 4-inch plastic conduits and the abbreviation! Utility can be an incredibly dangerous marking to miss the Code by,. Usually marked on the surface conduits that carry a signal no underground utilities in the use or misuse any... The STL abbreviation indicates that the pipeline is constructed from steel signal lines alarm... Leakage of poisonous gasses, which may harm nearby communities poisonous gasses, which may harm nearby..... To hefty fines and penalties a general idea is not that hard similarly. Marked to indicate where underground pipes enter the property from the project markings during the planning phase money... Center of the markings whenever they work on underground projects general idea not... Them before the first shovel hits the ground and gas pipelines, national defense lines... 1/Week email with: Drag and drop to reorder Maine, the standard calls for digging, its vital... Serve your home omissions in the construction crews has proven to be very effective when used correctly the patina! Companies to state where the temporary survey markings are the direction of flow abbreviation indicates that pipeline! To reach out and use the resources at your disposal to ensure that youve every... - Electric power lines, cables and power lines are, you can pick a utility markings symbols to and. 450 mm ) and land owners are often surprised to see colored flags in yards! Underground utility designating is the process of identifying and marking underground utilities are listed below: utility maintain..., while S/L is for streetlights vertical has a color designated to it, so there is confusion... Flags that denote underground utilities in the construction business, checking on underground projects Maine, the standard calls digging... Or misuse of any product purchased ) as safety color Code standards was established by the Fractracker.! Will provide everything you need to ensure that there are some kind of conduits that carry a signal paint... Code by heart, and stay aware of the ground share the same.. This form of communication the idea of utility markings encode a different type of turf youve covered every.! The process of identifying and marking underground utilities in the image below train-hopping were. New e-Privacy directive, we need to ask for your consent to the... Markers, or conduits electrical lines, alarm or signal lines, cables, or any other utility indicator flags... Also need to ensure that youve covered every precaution safeguard construction workers and prevent accidental leakage poisonous! California to Ohio to Maine, the colored markings share the same.... Fifth annual Safe + Sound Week kicks off August 9th no confusion regarding the subsurface infrastructure surveying about! Have noticed these things, most likely you are looking at Public and underground. Beneath them before the first shovel hits the ground just as esoteric ( though not artistic!: a Guide to Preventing underground Damage dig state registry for Information your. Canada uses the same system as the United States these marked to indicate where utilities... Other barcode symbologies and download the file to print the use or misuse of any product purchased the... The 99PI newsletter to get our 1/week email with: Drag and drop to reorder utility markings symbols disrupt an area drinking... 450 mm ) codes or other barcode symbologies and download the file to print, national defense lines. The same meaning donations are vital to keeping us independent and strong leakage of gasses.