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Drilling

By smadi66|April 29th, 2015|

Drilling Services We will work with you to determine the most efficient, cost effective and most importantly safest drilling method, utilizing our equipment, with the capability of reaching even the most inaccessible locations with our limited access drill rig. We offer you the following services: Geotechnical Drilling In preparation for construction, information must first be gathered about the underlying soil conditions to determine proper engineering for weight loads and stability. Types of soil, groundwater information and depth to bedrock are just a few aspects of ground chemistry. GEOTILL is able to perform in-situ sampling as well as install piezometers that will measure ground movement and settling patterns. We are also able to perform SPT (Standard Penetration Test), split spoon sampling and collect undisturbed samples. Environmental Drilling Today, more than ever, we recognize the importance of maintaining and appreciating our environment, not only for us, but for future generations to come. Since our beginning, GEOTILL has been providing environmental drilling services for our clients throughout the Midwest (Indiana, Ohio, Michigan, Kentucky, Missouri, and Illinois) . Our environmental drilling practices provide clean, accurate samples to determine the existence of any contaminates in soil or groundwater. To meet the needs of our individual client's projects, GEOTILL Geotechnical & Environmental drilling offers a variety of solid/hollow stem auger, air-mud-water rotary, coring as well as direct push sampling with our 8040 and 7822 Geoprobe . Rotary Drilling The rotary drilling technique is normally used for forming a deep observation borehole or for obtaining representative samples of rock. Powered rotary cutting tools use a cutter head on the end of a shaft, which is driven into the ground as it rotates. The system requires lubrication (air, water or drilling mud) to keep the cutting head cool and remove the soil or rock which [...]

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Drilling Geotechnical

By smadi66|May 23rd, 2013|

GEOTILL can provide drill rigs to serve the project needs in an effective and timely manner. The drill fleet includes truck, skid and all-terrain vehicle (ATV) mounted units, including rubber-tire and track-mounted units, along with an assortment of supporting equipment. The drill rigs are equipped with automatic Standard Penetration Test (SPT) hammers. With the skid-mounted unit, our personnel are able to reach difficult access locations such as side slopes and low headroom conditions. Our experienced drill crews perform a full range of services for both geotechnical and environmental drilling applications and has extensive experience with hollow-stem and mud-rotary overburden soil drilling, rock coring, and downhole in-situ testing. Additionally, our services include groundwater monitoring well, piezometer and slope indicator casing installation. Moreover, our field personnel are OSHA health and safety trained and most are licensed by the state of Indiana as well drillers. [/fusion_builder_column][/fusion_builder_row][/fusion_builder_container]

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Bush retires Geotechnical Engineer Chicago District

By smadi66|January 5th, 2022|Geotechnical Indiana, Calumet, Geotechnical Illinois, Chicago, Champaign|

Geotechnical Engineer Bush retires with over 30 years government service Leslie Bush receives an award during her retirement ceremony, 11-20-21 Thirty-one years ago, as a civil engineer summer hire for the Coastal and Geotechnical Engineering Section, Leslie Bush’s primary assignment was oversight of the geotechnical subsurface investigation activities for the west reach of the Little Calumet River, Indiana, Local Flood Protection and Recreation Project. “I worked on the West Reach subsurface investigation that consisted of soil sampling, use of drill rigs, and soil classification and testing for over 120 boreholes,” she said. The work required her to ensure the subsurface investigation was performed according to the scope of work, and that boring log documentation was thorough and that all required laboratory testing data was submitted to the district. A year later, in 1991, when she was hired as a full-time civil engineer in the Coastal and Geotechnical Engineering Section, her first assignment was to complete geotechnical design for levee system components of the same project. For approximately 15 years, she completed geotechnical design and eventually served as a technical lead for numerous sets of plans and specifications. Yesterday, the district joined Bush in celebrating her retirement and she said that, in her entire stretch here, completing design work, being an effective Value Engineering officer and Quality Program Manager, and executing security manager duties each provided highlights to her career. “It was very rewarding to carry work from the geotechnical investigation phase to design completion with the award of plans & specifications, to save the district a cumulative of approximately $87 million through use of Value Engineering techniques, and to ensure the district remained compliant with regard to Quality Management and security requirements,” she said. Other jobs she held included serving as the district’s Quality Program Manager for approximately 20 years, [...]

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Researcher Aids Arkansas Highway Projects Through Subsurface Analysis

By kk42|December 13th, 2021|Geotechnical Kansas, Geotechnical Arkansas, Geotechnical Illinois, Geotechnical Michigan, Geotechnical Missouri, Geotechnical Minnesota|

Source: Researcher Aids Arkansas Highway Projects Through Subsurface Analysis | University of Arkansas FAYETTEVILLE, Ark. – A University of Arkansas geotechnical engineer is collaborating with the Arkansas Department of Transportation to map subsurface conditions before road construction begins to identify issues early and help keep highway construction projects on track and on budget. Clint Wood, a civil engineering associate professor and geotechnical engineer, creates profiles of subsurface conditions and soil composition by sending stress waves into the ground and measuring their response at the surface. The non-invasive technology is similar to how ultrasound imaging works on the human body. The technology provides important information for highway designers and construction contractors, who’ve had to rely on imperfect methods for determining subsurface conditions, such as exploratory drilling, a strategy that can miss changes between limited drilling locations. Wood compares designing based on limited exploratory drilling to navigating with an incomplete map. The research is conducted for and in conjunction with the Arkansas Department of Transportation. With an additional $115,318 grant, the transportation department has provided a total of $561,427 in funding. The work focuses on estimating the depth and stiffness of bedrock for new highway alignments and understanding subsurface conditions that cause slope instability. The latter is especially important for understanding how water moves through a slope. Unexpected changes in bedrock depth near slopes can also create pockets where water collects, which can cause the soil in the slope to become saturated, leading to instability. Projects that encounter these issues can face substantial extra costs and delays while designers and contractors adapt the original plan or have to attempt another repair. Those problems can be avoided, or at least minimized, by better understanding the subsurface conditions through non-invasive testing. LIDAR AND DRONE ACCURACY In a separate project, Wood and several other U of A [...]

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Geologists and Geotechnical engineers provide flood risk management

By kk42|December 13th, 2021|Geotechnical Florida, CPT Blog, CPT Data, Cone Penetration, Geotechnical Arizona, Geotechnical California, Geotechnical Texas, Geotechnical Wisconsin|

Source: DVIDS - News - Geologists and Geotechnical engineers dig deep to provide flood risk management At the Arcadia flood risk management project, in Arcadia, Wisconsin, geotechnical staff are gathering data using a unique method of subsurface exploration. The Cone Penetrometer Test, or CPT, is one method used to identify and characterize soils. The CPTs were conducted with assistance from the Savannah District geotechnical and geology branch. “We benefited from their expertise and cooperation,” said Greg Wachman, senior geotechnical engineer. In CPTs, a device with a conical tip and metal sleeve measure penetration resistance as it’s pushed into the ground. Those measurements are used to characterize the soils’ engineering properties. For example, the forces on the device as it’s pushed through a soft clay are very different from those as it’s pushed through a dense sand, Wachman said. The device also records pore water pressure, which aids in understanding soil permeability and groundwater characteristics. CPTs vs. soil borings A CPT is most useful when used together with standard soil borings, Wachman explained. A soil boring drills into the ground to retrieve physical samples. In contrast, with a CPT, the soil is never seen. CPTs are significantly faster than standard borings and provide continuous test data with depth. With a soil boring, samples are collected about every 5 feet, or change in material, so it’s possible to miss important information. One limitation of the CPT, due to excessive friction, is that it may not be extended to the same depth as a soil boring. The CPTs at Arcadia are being pushed to approximately 60-70 feet, whereas a soil boring can be performed in excess of 100 feet. “By doing some CPTs next to soil borings – where we know what the soils are – we can increase the likelihood that we [...]

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Oil wells in L.A. and Residential Health Problems

By kk42|October 15th, 2021|Drilling, Oakland, Geotechnical Pennsylvania, Santa Ana, Geotechnical West Virginia, Anaheim, Geotechnical California, Geotechnical Louisiana, Los Angeles, Geotechnical Texas, San Diego, Geotechnical Wyoming, San Jose, San Francisco, Long Beach, Fresno, Sacramento|

Source: Oil wells in L.A.: Nearby residents grapple with health problems Magali Sanchez-Hall, a Wilmington resident for over two decades, has struggled with asthma her entire life. She says the health issue stems from her proximity to oil and gas drilling. Emma Newburger | CNBC LOS ANGELES, CALIF. — Stepping out of a coffee shop near Interstate 110 in the Wilmington neighborhood of Los Angeles, you’re immediately hit by a foul odor. Magali Sanchez-Hall, 51, who’s lived here for more than two decades, is used to the smell of rotting eggs wafting from the hundreds of oil wells operating in the neighborhood. She’s used to her neighbors describing chronic coughs, skin rashes and cancer diagnoses, and to the asthma that affects her own family, who live only 1,500 feet from a refinery. “When people are getting sick with cancer or having asthma, they might think it’s normal or blame genetics,” she said. “We don’t often look at the environment we’re in and think — the chemicals we’re breathing are the cause.” Wilmington, a predominantly working-class and Latino immigrant community of more than 50,000 people, has some of the highest rates of asthma and cancer in the state, according to a report by the non-profit Communities for a Better Environment. It’s surrounded by six oil refineries and wedged in by several freeways and the ports of L.A. and Long Beach. California, the seventh-largest oil-producing state in the U.S., has no rule or standard for the distance that active oil wells need to be from communities. For many Californians, especially Black and brown residents, acrid smells, noise and dirt from oil production is part of the neighborhood. Walking around Wilmington, pumpjacks are visible in public parks, next to schoolyards where children play and outside of people’s windows at home. At night, the sky is lit [...]

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Studying the ground under your feet: Interview with Taylor Hall about rock and soil stability

By kk42|October 15th, 2021|Geotechnical Kentucky, Geotechnical Arizona, Geotechnical California, Geotechnical Idaho, Geotechnical Montana, Geotechnical New York, Geotechnical Oregon, Geotechnical Utah, Geotechnical Wyoming|

Source: Studying the ground under your feet: Science Moab speaks with Taylor Hall about rock and soil stability | Get Out & Go | moabsunnews.com Moab is renowned for its biological soil crusts, but what’s happening underneath all that crusty black — with the soil and rock itself? This week, we speak with geotechnical engineer Taylor Hall, owner of the Moab Geotechnical Group, about soil mechanics, engineering tools, and how he decided — at age 15, in a McDonald’s — to start working with the dirt. Science Moab: What is geotechnical engineering? Hall: Geotechnical engineering generally deals with rock and soil mechanics and physics: how those materials will respond to structures or just how they respond to gravity. We might look at something like a bridge to understand its foundations, or we might look at a landslide that gets triggered by natural causes. We’re fortunate to be able to come in there and tell you how things are responding and why and what to expect. Science Moab: How do you test soil? Hall: When geotechnical engineering got its feet in the 1940s and 1950s, they would sample soil by drilling a hole and driving a sampler into the ground using a fixed-weight hammer. Using that method, we were able to acquire a sample and get some resistance associated with that sample. That's much of what we do today, but we do it now because it's backed by 60 or 70 years’ worth of empirical relationships. Generally, you're only dealing with one or two such holes, and you have to use them to characterize a whole site. It's tough, but that's why I chose geotechnical engineering: because no two sites are the same. It provides the opportunity to really think on your feet. Science Moab: Once you’ve taken measurements, how do [...]

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Stress in Earth’s crust determined without earthquake data

By kk42|October 11th, 2021|Moore, Thornton, Carlsbad, Geotechnical Colorado, Stillwater, Geotechnical New Mexico, Geotechnical Oklahoma, Denver, Albuquerque, Oklahoma City, Colorado Springs, Las Cruces, Tulsa, Aurora, Santa Fe, Norman, Lakewood, Rio Rancho, Lawton, Fort Collins, Roswell, Broken Arrow, Arvada, Farmington, Edmond, Pueblo, Alamogordo, Midwest City, Westminster, Clovis, Enid, Boulder, Hobbs|

Source: Stress in Earth's crust determined without earthquake data Scientists at Los Alamos National Laboratory have developed a method to determine the orientation of mechanical stress in the earth's crust without relying on data from earthquakes or drilling. This method is less expensive that current approaches, could have broad applicability in geophysics and provide insight into continental regions lacking historical geologic information. "We utilized the nonlinear elastic behavior in rocks and applied a new technique to monitor the orientation of the maximum horizontal compressive stress in rocks in parts of Oklahoma and New Mexico," said Andrew Delorey of Los Alamos. "The orientation of that maximum horizontal compressive stress reveals which fractures in the rock will be active." North-central Oklahoma was selected because induced seismic activity has been ongoing in the region after decades of injected wastewater from oil and gas operations. That seismic activity occurs on faults optimally oriented in the regional stress field. North-central New Mexico was selected to compare the results to a geologic setting straddling a continental rift separating the Colorado Plateau from a stable section of the earth's crust. The scientists determined that the earth exhibits stress-induced anisotropy of nonlinear susceptibility that is aligned with the maximum horizontal compressive stress in these two different geologic settings. Rocks become stiffer when compressed and softer when extended, but this effect isn't instantaneous. The rate is faster in the orientation where the ambient stress field is most compressive. By measuring this rate in different orientations, scientists can determine the orientation where ambient stress is most compressive. Determining the geophysical stress orientation, or the direction of maximum horizontal compressive stress, is usually determined by drilling narrow, deep boreholes. However, borehole drilling is expensive and only provides a single data point. Additionally for vast regions, the geophysical data simply hasn't been collected because [...]

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California agency finds significant liquefaction

By kk42|October 11th, 2021|Earthquakes, Los Angeles, San Diego, San Jose, San Francisco, Long Beach, Fresno, Sacramento, Oakland, Santa Ana, Anaheim, Geotechnical California|

Source: State agency finds ‘significant liquefaction’ | Local News Stories | hmbreview.com The green in this map indicates areas on the coast that may be prone to liquefication, according to the California Geological Survey. Illustration courtesy California Geological Survey The California Geological Survey last week released new hazard maps for San Mateo and Contra Costa counties that detailed where landslides and soil liquefaction could likely occur in the event of a significant earthquake. The CGS’s Seismic Hazard Zone maps found “significant” liquefaction zones in parts of San Mateo County, particularly in Half Moon Bay, Miramar and San Bruno. The state has already mapped most of the Peninsula, including Montara Mountain, Woodside and San Mateo. But La Honda and San Gregorio are two notable rural areas that don’t have data accessible yet. Each map, a roughly 60-mile zone called a “quadrangle,” accounts for three types of geologic issues caused by earthquakes: a fault rupture, landslide and liquefaction, which describes the process when seismic tremors cause soil to mix with groundwater and behave like quicksand. The state agency identifies most of the city of Half Moon Bay as inside a liquefaction zone. Its quadrangle is 74 square miles, and the liquefaction zone spans the city’s entire coastline and more, including most of the neighborhoods up to Pilarcitos Creek, including El Granada, Miramar and rural areas like Purisima Creek Redwoods Preserve. The map also identifies fault zones on both the east and west sides of the Half Moon Bay Airport, and more than half of Montara Mountain’s quadrangle is at risk of earthquake-induced landslides. The CGS maps were drafted in February but became official on Sept. 23. Land management agencies and cities use hazard maps to identify properties that require site-specific studies before breaking ground on new development. [...]

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What is a cone penetration test (CPT)?

By kk42|October 8th, 2021|

The cone penetration test has become one of the most widely used and accepted test methods for determining geotechnical soil properties. A cone penetration test is used to determine geotechnical properties of soils. The data gained from a cone penetration test can be used to assess whether soil layers are likely to liquefy under different levels of seismic shaking. How does a cone penetration test work? The cone penetration test can be completed from the ground surface. Cone penetration test rigs vary in size - from small portable rigs to large truck-mounted rigs. Each rig has benefits and limitations but they all conduct the same test. A cone penetration test rig pushes a steel cone (about 1-1/4" wide) into the ground, generally up to 65-1/2' below the surface or until the cone reaches a hard layer. The steel cone records tip resistance and sleeve friction using an electronic measuring system. The different degrees of resistance is recorded using force sensors in the tip of the cone. At the same time as the sensors are recording resistance at the cone tip, sensors in the friction sleeve are recording sleeve friction along a 3-15/16" length. Some cones also have a pore water transducer, which records water pressure in the soil. These readings can be used to determine groundwater responses as the cone is pushed through the soils. How long does a cone penetration test take? A cone penetration test typically takes between 30 minutes and 3 hours. As the cone goes into the ground, measurements are constantly sent back to the rig and recorded on a computer. This data gives a profile of the subsoil layers, often called a 'trace'. What do the test results tell us? Cone penetration test results are used by geotechnical engineering specialists to understand the soil properties [...]

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