Gpr scanning depth Skip to content (732) 566-2035 Oct 14, 2019 · Here are a few real world examples of antenna selection, taken from the nearly 8,000 GPR scans Echo has performed across the United States. Depth measurements with GPR that has not been adjusted for a Scan Area is always approximate, and Depth locate quality is low. Please fill out the form at the top of the page, or give us a call at 888-445-SCAN (7226) . Why Scanning only with Scano? Our fast and efficient concrete scanner using Ground Penetrating Radar will give a vital information on the concrete depth, objects within the concrete, and any possible air pockets that are undetectable from the surface. Clay isn’t the only thing that affects GPR depth. The antenna is the crucial element of a RADAR system. Moist clays, shale, and other high conductivity materials, may attenuate or absorb GPR signals, greatly decreasing the depth of penetration to 3 feet (1 meter) or less. Conversely, if you’re scanning dry material, the depth reaches the higher end of GPR’s capabilities. GROUND Penetrating Radar”, Book of Standards Volume 04. Ground-penetrating radar equipment can be used in identifying the following: Jan 23, 2019 · GPR Data is a leading expert in GPR Concrete Scanning and Imaging. A GPR system is made up of three main components: Control unit; Antenna; Power Supply; GSSI GPR equipment can be run with a variety of power supplies ranging from small rechargeable batteries to vehicle batteries and normal 110/220-volt. Efficient Simple to set up and operate, with on-the-fly data visualization to avoid interpretation errors on site Accurate Depth range adjustment Scan width 0. • FHWA-HIF-00-015, “Ground Penetrating Radar for Measuring Pavement Layer Thickness”. Who Uses GPR? GPR is a high-resolution concrete imaging and scanning method that provides images of anything that may be embedded in or below a concrete structure, such as a building, road, or bridge. The 900, 400, 270, and 200 MHz and 300/800 MHz antennas used in Ground-penetrating radar, or GPR, is a surveying technique that uses electromagnetic waves to detect and map the subsurface. Unlike electromagnetic locators, which are unable to detect nonmetallic objects, the effective GPR scanning depth is not limited to 10 to 15 feet. The information below can also be found at the manufacturer’s website. Ground penetrating radar surveys can be conducted using a GPR cart that is pushed along the ground surface, or they can be performed using an ATV or Nov 30, 2018 · GPR scanning only requires access to one side of the concrete, making it the preferred scanning application for slab on grade concrete projects. ATS clients use our GPR scanning services to uncover embedded objects and defects beneath concrete surfaces. The chart included here demonstrates the potential depth for GPR. Does GPR Have Any Limitations? Yes. ASTM D6432, “Standard Guide for Using the Surface Ground Penetrating Radar Method for Subsurface Investigation”, Book of Standards Volume 04. • ASTM D6432, “Standard Guide for Using the Surface Ground Penetrating Radar Method for Subsurface Investigation”, Book of Standards Volume 04. The best way to determine post tension cable location and depth is with ground penetrating radar (GPR) and 3D laser scanning technology. SD Technical Services offer 3D Ground Penetrating Radar (GPR) Scan Survey Service in Singapore which visualise the approximate location of subsurface structures for design stage, construction stage and to detect cables, pipes, rebars, tree roots, voids, and underground caves. This this subsurface tool is most effective when there is a large difference between the electromagnetic property of the target and surrounding GSSI GPR Equipment. To this end, it is more of an abstract, discussion, and summary than an in-depth reference guide for GPR concrete scanning methods. Our powerful radars send electromagnetic pulses into the ground, revealing the intricate network of: Oct 27, 2021 · Learn how ground-penetrating radar, or GPR, works to survey subsurface materials in a non-destructive approach using small electromagnetic radar pulses. For concrete scanning, GPR can penetrate depths of 18-24. Though Ground Penetrating Radar serves as an insightful and comprehensive subsurface imaging tool, functionality and readings can vary widely due to site conditions. GPR scanning, or Ground Penetrating Radar scanning, is a non-destructive method used to detect and map subsurface objects and structures. Ground and soil conditions, weather, and type of material located are a few of the potential limiting factors. For a general question like “How deep can you see with ground penetrating radar (GPR)?”, the answer is usually a range such as “2 to 10 feet” or “up to 18 inches”. Simple concrete cutting or core drilling Ground Penetrating Radar GPR Services & Technology. X-ray scanners are unable to determine depth while ground penetrating radar depth penetration can vary between 12-24 inches on average and go up to 36 inches in concrete. However, the answer itself depends on three different factors: soil conditions, your system’s frequency range, and the size of the target you want to locate. Quick Scan Tomography View Depth = v*TWT/2 RDP or (ξ r)=(c/v)² and v=c/√RDP; c=0. In addition, if you need to know the depth or thickness of anything you are scanning, GPR scanning would be the best solution for you. The ability to find out what's underneath the surface without breaking the ground is vital because it will provide The Proceq GPR concrete scanner utilises ultra-wideband technology which enables high resolution scanning to a maximum depth of 700mm. As mentioned before, the screen of the equipment shows data in a very Nov 21, 2024 · This is made possible with world’s most advanced concrete GPR scanners, the Proceq GPR Family. With accurate information about the location and depth of obstructions, you can confidently map out your cutting or coring strategy for maximum efficiency. It can unveil hidden treasures, map utility lines, and provide crucial data for construction projects. GPR equipment transmits and receives electromagnetic waves into the ground subsurface or other material and detects interfaces between differing materials. As the radio waves encounter discontinuities, they reflect back to the surface. GPR can detect cavities within a structure or underground. Aug 1, 2017 · GPR can scan at any depth. Under ideal conditions like dry sandy soils, GPR can penetrate up to about 10 meters (33 feet). Ground Penetrating Radar (GPR) is a non-invasive geophysical method used for subsurface imaging. The GPR cross-section shows the ground surface at the top of the profile, and the reflections of subsurface geologic units and objects to a certain Oct 15, 2024 · In the management and maintenance of structural facilities, knowing the cover thickness of rebar and the depth of buried objects is of paramount importance. Our website: onlineconcretescanning. It is not much used since y axis is the most desired in construction because it is takes much time and it is costly. Alternate phrases for ground penetrating radar include: Subsurface radar inspection; Georadar scanning; Ground radar detection; Ground-penetrating survey; GPR scanning; Ground radar imaging Ground penetrating radar is particularly effective for identifying and mapping subsurface structures and anomalies during inspections, including: Buried Jun 21, 2024 · B-Scan of GPR concrete scanning. 0 GHz. deep through clay, and 50 in. 813-614-1718. The GPR equipment in concrete scanning applications is only able to scan up to 20 inches. Highest data quality. The wave will “bounce” off any material it encounters. The MALÅ CX ground penetrating radar (GPR) system allows users to scan concrete structure simply and safely and present GPR data clearly for real-time and in-the-box data acquisition, display and analysis. GPR equipment emits radar signals that penetrate the Dec 16, 2024 · GPR scanning and utility locating services are more suited to larger objects or clusters. For more information about concrete scanning, ground penetrating radar (GPR) or other related services, please contact one of the companies listed in the get a quote section. GPR has three main We are South Africa's premier ground penetrating radar (GPR) scanning experts, equipped with cutting-edge technology to be your one-stop shop for all gpr scanning needs. Is Ground Penetrating Radar Safe? Ground penetrating radar systems are safe and can be used in public areas, emitting around 1% of the power of a mobile phone The accuracy of GPR depends upon the materials being scanned, the conditions of the scan, the frequencies and equipment being used, and the expertise of the person performing the scan. The interfaces between differing materials are identified by changes which occur in the electromagnetic waves. The electrical conductivity of the scanned medium, the transmitted centre frequency, and the radiated power all influence the penetration depth. By using GPR, concrete scanning can detect and locate rebar, post-tension cables, conduits, and other embedded objects within Feb 22, 2022 · Learn how subsurface imaging works with ground penetrating radar (GPR) to create 3d imaging, including how to set up fixed & flex survey grids with US Radar. It is a cost-effective, non-destructive test used to scan and locate embedded objects from the surface. The idea of using the propagation of high-frequency EM waves for subsurface investigations can be traced back to the beginning of the century, but the earliest references to the possibility of using […] Dec 6, 2021 · Ground penetrating radar systems are very effective in every subsurface application, and this certainly includes scanning walls, ceilings and other non-ground surfaces. Identify Material Type with Accuracy. Answer: The penetration depth for GPR scans is dependent on the frequency range and power of the scan, the density of any intervening material such as pavement or stone slabs, the concrete or asphalt mix design, and so on. We can find and measure any irregularities, ensuring your project can continue without problems or risks. com – C-scans provide a horizontal depth slice at a given depth, it is a three dimensional scan composed of simultaneous B scans along the xy plane. It’s effective at detecting and measuring the size and depth of a variety of objects buried beneath a range of surfaces. Is Ground Penetrating Radar Safe? Ground penetrating radar systems are safe and can be used in public areas, emitting around 1% of the power of a mobile phone After concrete scanning was completed with ground penetrating radar technology, GPRS 3D laser scanned each floor to produce 2D CAD drawings and a 3D BIM model for virtual design and construction. Scan concrete roofs for the safe installation of rooftop units, scan slab on grade or elevated slabs for steel reinforcement, mesh, conduits, and concrete depth. 100% real time. GPR cannot measure the void’s depth. SCANTEC uses a wide range of GSSI’s GPR antennas for our services. Through innovation and collaboration, we minimize our ecological footprint and inspire others to follow suit. It determines data quality, range resolution, maximum depth of penetration, etc. b. Ground penetrating radar for concrete is used for two main reasons: 1. resolution, more accurate depth reporting, and 3D (x, y, z) mapping. Many elements of concrete can be observed with the help of ground penetrating radar. 03, ASTM International. As the name suggests, slab-on-grade is a type of concrete slab poured directly onto the ground. GPR scan data can be saved for off-site analysis, including CAD plotting; Ground Penetrating Radar can be used with different antenna frequencies to provide a range of penetration depths and resolutions. The architect received a permanent record of the post tension cable layout to complete fit and finish design plans for the 12 floors of the building. Figure 3 shows the relative power necessary to probe to a given depth for the attenuations depicted in Figure 1. We deliver Ground Penetrating Radar reports that are cost Jan 26, 2022 · Ground Penetration Radar (GPR) is a geophysical method of identifying what lies beneath the ground, typically using radio waves in the microwave band. It is also known as a Non-Destructive Testing (NDT) method. GPRS is the nation’s largest private subsurface locating company. GSSI provides the widest range of ground penetrating radar and electromagnetic induction equipment available-covering all GPR survey applications Ground penetrating radar (GPR) is a non-destructive geophysical method that produces a continuous cross-sectional profile or record of subsurface features, without drilling, probing, or digging. Accurate depth measurement with GPR requires the correct “Dielectric Constant” settings. May 8, 2024 · In GPR scanning, a 40-MHz antenna is used with specifications of 5 dielectric constant, 600 scans/nS, and 40 m depth. When used in conjunction with the GSSI UtilityScan module, which is manufactured by Geophysical Survey Systems, Inc. Our team will use advanced Ground Penetrating Radar to scan the area carefully before starting any drilling, cutting, or digging. Concrete scanning is a specialized application of Ground Penetrating Radar (GPR) that is used to identify potential hazards and avoid dangers during construction or renovation projects involving concrete structures. As Oct 10, 2023 · Ground Penetrating Radar (GPR) scanning is undeniably a remarkable technology that has revolutionized subsurface investigations. Multichannel GPR pushcart Modular sensors. 85 m ² | 0. However, like any superhero, GPR has its limitations and faces challenges in the real world. The GPR equipment can differentiate between objects. GPR can detect variations within a ground surface, making it easy to detect most subsurface items located near the surface. Skip to content (732) 566-2035 Discover innovative ground-penetrating radar products for an array of diverse applications. GPRS uses this technology for private commercial applications such as utility locating, concrete imaging, and other services. Dec 12, 2023 · At Ameriscan GPR, we recognize that Ground Penetrating Radar (GPR) scanning is a remarkable tool with the potential to transform subsurface investigations, particularly in the construction industry. For more on GPR theory visit Sensors & Software at The FAQs are provided by Sensors & Software of Canada, a great resource for GPR concrete scanning should be used before any renovation work begins to avoid costly and dangerous subsurface damage to rebar and other structural reinforcement within concrete. But recent research involving magnetic antennas reveals that antenna size can be greatly reduced, creating highly portable and accessible GPR systems that can penetrate 100 meters or more , depending The accuracy of GPR depends upon the materials being scanned, the conditions of the scan, the frequencies and equipment being used, and the expertise of the person performing the scan. 6GHz, down into the ground through a transducer (also known as an antenna). All applications typically addressed with multiple antennas can now be covered with one single device with a frequency range of 0. DCSS is always interested in using the latest technology in order to solve today’s problems, and are one of the world’s foremost experts in the application of the Ground Penetrating Radar in the construction environment. x t y t Ampl Antennas Air-ground Object Ground-penetrating radar services (GPR) is a non-destructive method of scanning and profiling an area to ascertain the existence and location of underground utilities, buried valves, tanks, or other structures. It is a non-intrusive method of surveying the sub-surface to investigate underground utilities such as concrete, asphalt, metals, pipes, cables or masonry. Ground-penetrating radar (GPR) technology is a non-invasive, non-destructive geophysical surveying technique that produces a two-dimensional cross-section image of the subsurface. Mar 21, 2022 · Ground-penetrating radar, or GPR, is the tool that many use to ease their pipe-finding frustration. It has been used for decades - but how accurate are these scans? The Accuracy of Ground Penetrating Radar (GPR) Technology Ground-Penetrating Radar is a highly accurate tool! Ground-penetrating radar can be… About GPR Scanning Australia Pty Ltd. The 5 Things that Affect Ground Penetrating Radar Depth Penetration. Mar 5, 2020 · If you are considering purchasing a ground penetrating radar system, you may be wondering “How Deep Does GPR go?”. 2000 MHz – Palm Antenna Mar 1, 2021 · Ground-penetrating radar (GPR) has been widely used to detect subsurface objects, such as hidden cavities, buried pipes, and manholes, owing to its noncontact sensing, rapid scanning, and deeply GROUND Penetrating Radar”, Book of Standards Volume 04. 2 to 4. 3 m). Though GPR equipment may not perform optimally in all conditions, it can perform basic functions in a wide variety of sites. a. Can GPR Detect More Than Just Rebar Within Concrete? Ground Penetrating Radar (GPR) technology has many capabilities beyond locating rebar and structural reinforcements. GSSI is one of the the world’s leading manufacturers of ground penetrating radar (GPR) equipment. In this blog post, we'll delve into the factors that influence the precision of GPR scanning, shedding light on both its GPRS is the nation’s largest private subsurface locating company. Ground Penetrating Radar When determining depth capabilities, the frequency range of the antenna dictates The depth that ground-penetrating radar (GPR) can reach depends on various factors, including the type of ground and the frequency of the radar waves. Ground penetrating radar (GPR) offers an accurate, non-destructive solution to mapping the subsurface of the earth. With the addition of a survey grade GPS like the FLX100, the DSX utilizes GPS to help the operator locate the best starting point for a grid scan and then to ensure that the tracking lines are spaced properly. We can help you answer this common question. It is a non-destructive method of concrete scanning that is used to inspect the concrete structure, measure slab thickness, and locate rebars, PT cables, conduits, voids, and other utility installations. It is commonly used in construction, engineering, and archaeological projects to identify potential hazards or locate buried utilities. Gauging the stability and performance of concrete 2. Think of GPR scanning as your high-tech X-ray for the Earth. GPR is also able to give real time results, quickly and accurately. However, achieving the pinnacle of accuracy with GPR is a nuanced endeavor. Oct 8, 2021 · GPR or Ground Penetrating Radar scanning is the industrial standard to see through the concrete structure. Provide Exact Depth in Jun 17, 2021 · If you are casually looking for a quick answer to this question, we will say that you can look anywhere around 3 in. Traditionally, depth perception in GPR has been associated with the size of the scanning device — the larger the antenna, the deeper it can see. 2300 MHz antenna offers superior depth penetration and high resolution; Full keypad control on the antenna top provides remote control of user interface Jan 19, 2022 · Question: What is the penetration depth for ground-penetrating radar? –George, New Braunfels, TX. to 15 in. As the name suggests, multi-channel allows several antennas to be used simultaneously; in the case of the SIR-30, up to 4 (although you can piggyback two units, giving a total of 8 channels). Ground-penetrating radar (GPR) is a geophysical method that uses radar pulses to image the subsurface. GPRS provides concrete scanning, utility locating, leak detection, and video pipe inspection services. Seeing through materials before invasive work is done. GPR technology is a non-destructive concrete scanning detection and imaging method that sends a radio wave from a receiver into a concrete structure. Oct 20, 2024 · When it comes to GPR scanning, understanding the cost involved is crucial. Ground penetrating radar’s ability to visualize what’s inside and under concrete slab-on-grade is one of its biggest advantages over X-Ray scanning technology. Our vision is a future where operations harmonize with nature, preserving ecological integrity for generations. Feb 28, 2022 · The electromagnetic signal from GPR is absorbed much faster by highly saturated materials, resulting in decreased depth penetration. There are five basic factors that can impact ground penetrating radar depth. Accuracy Counts. Quantum Imager Triple Frequency GPR System Scan depth:30ft Antenna One key advantage of GPR scanning is its non-destructive nature. A higher-frequency antenna (typically in the range of 2600 MHz to 1600 MHz) provides high resolution and depth penetration up to 400mm. 82 m ³ Inspecting Tunnels, Slabs, and Pavements with Ground Penetrating Radar May 23, 2024 Compact GPR UtilityScan. Archaeology & Forensics Archaeologists and remote sensing specialists around the world rely on GSSI ground penetrating radar as a key tool for non-invasive site investigation. Feb 18, 2022 · Ground penetrating radar is a non-invasive technology used to survey subsurface materials. While GPR can detect an object, it may not tell you exactly what it is made of. 3 m/ns (300 mm/ns, 300 m/μs) GPR provides a continuous profile (B-scan) of the subsurface while mowing the antennas over it. au is designed to provide an overview of the various concrete services available, and help refer people to respected providers. Hilti Concrete scanners and sensors - PS 1000-B X-Scan Concrete scanner - Efficient concrete scanner to locate embedded objects in multiple layers The ground penetrating radar (GPR) cross-section shows the ground surface at the top of the profile, and the reflections of subsurface geologic units and objects to a certain depth at the bottom. of Nashua, NH, this technology makes it possible The best practice is to complete a grid scan with each line scan offset by 18 inches. This overview of Principles and Theory touches on the physics of GPR concrete scanning. Ground Penetrating Radar Evaluation of Concrete Tunnel Linings, Palm XT is a small form factor GPR antenna that allows users unprecedented access in tightly spaced areas and enables easy overhead scanning. If we have access to both sides of the slab, then the analyst would be able to scan thicker concrete. Ground penetrating radar is also known as GPR, Georadar, and ground probing radar. Apr 1, 2024 · Precision Planning: GPR scanning provides detailed, three-dimensional images of the concrete structure, making job planning a breeze. [ 1 ] Jul 3, 2016 · Figure 3: When attenuation limits exploration depth, power must increase exponentially with depth. GPR Scanning experts call us anytime. In materials with high resistance, such as ice or dry granite, it can reach even hundreds of meters. Sep 30, 2021 · This tragedy demonstrates precisely why ground penetrating radar (GPR) is an indispensable tool for saving lives and saving concrete structures. ceramic. com and screeningeagle. GPR Scanning Australia Pty Ltd is committed to leading in environmental sustainability. One can readily see increases in exploration depth require large power sources. FHWA-HIF-00-015, “Ground Penetrating Radar for Measuring Pavement Layer Thickness”. We’ve been using GPR technology since 1997 and are leaders in the field of concrete scanning. (After Basson 2000) Introduction GPR is an electromagnetic (EM) geophysical method for high-resolution detection, imaging and mapping of subsurface soils and rock conditions. But you know that none of the […] We have helped on hundreds of projects for a wide variety of clients with our ground penetrating radar expertise, and we are here to help you. Ground Penetrating Radar 2-3 A-scan A single waveform b(x i , y j ,t)recorded by a GPR, with the antennas at a given fixed position (x i , y j) is referred to as an A-scan (Fig. The SIR-30 from GSSI is a multi-channel GPR system offering a number of advantages over single-channel systems such as the SIR-3000. In this comprehensive blog post, we'll delve into the intricacies of May 8, 2024 · In GPR scanning, a 40-MHz antenna is used with specifications of 5 dielectric constant, 600 scans/nS, and 40 m depth. com. For large concrete areas, the GP8100 achieves a very dense GPR data collection with 25cm effective scan width and high scan rate of 1'200 scans/s, in just one superline scan. Day: Wednesday Date: 10 Jul 2024 Jan 31, 2021 · What is Ground Penetrating Radar? Ground Penetrating Radar (GPR) technology has been available since the early 1970s. (1) Advantages . Currently, Smartphone-Equipped Handheld Ground Penetrating Radars (GPR) are primarily used for detecting rebar, yet the Electromagnetic Induction (EMI) method remains the sole available technique for determining the cover thickness of Ground penetrating radar (GPR) offers an accurate, non-destructive solution to mapping the subsurface of the earth. Read below to know the general procedure followed by professional locating services to calculate the max depth GPR can get a visual on. deep through a concrete patch while concrete scanning with GPR, 30 in. Powerful 3D software. The technician used a 1600MHz ground penetrating radar antenna for the service. GPR can determine the location of unmarked graves for site planning purposes. The depth that ground penetrating radar (GPR) can penetrate depends on the application. Collect GPR Data: The first step is to collect ground penetrating radar scanning data by scanning the area where the utilities are suspected to be located. Scanning a masonry wall to detect embedded metal Ground Penetrating Radar Penetration depth#. That’s why MPL’s ground penetrating radar (GPR) services are critical. The GPR measures the amplitude strength and time required for the return of any reflected signal within the time/depth window used by the radar. With the combination EM & GPR technology, MPL is better able to precisely and accurately locate everything that is underneath the surface, whether it be known or unknown utilities and structures. The operator should be aware of how their GPR presents the zero point and, Feb 13, 2023 · Watch this short video to learn more about how ground penetrating radar is used for utility location. Whether it’s copper pipes or PVC — where traditional methods falter and fail, GPR excels. deep through dry soil. 8% subsurface damage prevention scanning rate on hundreds of thousands of scanning and location projects. 09, ASTM International. Versatile Two swappable array modules to cover one vast array of subsurface mapping applications. It’s useful for accurately locating objects hidden within walls or even in scanning the underside of a floor to locate conduits and reinforcements. If you’re scanning a site with dense, wet clay, the impact on penetration depth is considerable. It’s a proven method to reliably locate, measure and map underground objects. credit: researchgate. Our dedication to safety has helped us achieve an over 99. It is a useful tool in concrete scanning to identify subsurface defects such as voids and corrosion. As you can see, ground penetrating radar can reach depths of up to 100 feet (30 meters) in low conductivity materials such as dry sand or granite. Dec 6, 2021 · Ground penetrating radar systems are very effective in every subsurface application, and this certainly includes scanning walls, ceilings and other non-ground surfaces. It's widely employed in various fields such as geology, archaeology, environmental studies, and civil engineering, particularly for utility locating and precision concrete scanning and imaging. Ground Penetrating Radar can locate reinforcement steel, core fills and voids in CMU walls. What Does GPR Detect? Ground Penetrating Radar signals can be used to find a wide range of items. Ground Penetrating Radar (GPR) – An Electromagnetic Investigation Method How does it work? GPR operates by transmitting pulses of high-frequency radio waves, in the range of 10Mhz-2. Jul 10, 2024 · Introduction to GS9000 - GPR scanning made easy Discover the incredible capabilities of the GS9000, the revolutionary multichannel GPR that simplifies subsurface investigation and mapping. GPR C-Scan showing a potential void at a depth of 12 inches (0. Wireless, Lightweight with excellent deep resolution scanning; Achieve scanning depth from 4 to 7 feet in most soil conditions/ Maximum scanning depth of up to 35 feet (10 m). Buried Items. GPR Scanning Services - Applied Technical Services +1 (888) 287-5227 The highest depth performance in 3D utility mapping with new EsT technology The compact hand-sized GPR with dual polarization to never miss a detail in one scan That’s why MPL’s ground penetrating radar (GPR) services are critical. The only variable is the time, which is related to the depth by the propagation velocity of the EM waves in the medium. . 2-1). GPR can show the shape and position but may not distinguish between similar materials, like plastic vs. The anomalies acquired on GPR scans at various depths are confirmed with low-resistivity ranges of 27–50 Ω m at 23 and 27 m depths obtained from the MERI. Figure 3: When attenuation limits exploration depth, power must increase exponentially with depth. 350 MHz Antenna provides excellent target resolution for deep scanning; Data storage capacity of 64 GB 5. Soil Composition: What’s in the soil, and how much clay is in there? (What we talked about above). evkc cbwzkep cayxlch efkmnkg fblnsjwe sqqh oclqmz ahcuk ekhpt jzbx