shallow well monitoring Articles

  • Evaluating the Vulnerability of Bored and Driven Wells in a Shallow Unconfined Aquifer

    Shallow unconfined aquifers are the only source of water for private wells in some rural areas. The Oak Openings region of Ohio is one such location. Wells are usually bored or driven in shallow aquifers and are more susceptible to contamination caused by human activities on the surface. To provide better protection for consumers developing shallow wells, local health departments have doubled the ...

  • Ground water sampling bias observed in shallow conventional wells

    EPA’s Hutchins and Acree present the results of their field research showing the misleading data that are often generated using samples collected from conventional monitoring wells. They conclude that “These data provide an additional example where cluster well points or other methods of obtaining depth-discrete samples would be required to provide an accurate assessment of either the extent of ...


    By Solinst Canada Ltd.

  • Locate buried monitoring wells case study

    A Phase II Environmental Site Investigation was being conducted at a gasoline station in Fort Myers, Florida. In order to minimize costs, our client intended to use several existing on-site monitoring wells rather than installing new wells. However, five of the existing wells had been covered with asphalt and were no longer visible. GeoView was tasked with performing a shallow geophysical study ...


    By GeoView, Inc.

  • Tacoma, Washington - Well 12A superfund site - Case Study

    Combined Remedies for DNAPL Remediation Project Summary TRS Group, Inc. (TRS) teamed with KEMRON and AMEC, under KEMRON's U.S. Army Corps of Engineers (USAGE) Environmental Remediation Services Multiple Award Task Order Contract (MATOC), to perform electrical resistance heating (ERH) for the remediation of volatile organic compounds (VOCs) in the vadose zone ...


    By TRS Group, Inc.

  • Seasonal variation in the microbial quality of shallow groundwater in the Kathmandu Valley, Nepal

    To develop effective groundwater pollution control strategies for the Kathmandu Valley, Nepal, seasonal variations in microbial quality and their underlying mechanisms must be understood. However, to date, there are no studies that address these topics. In this study, groundwater samples from dug wells were collected during the dry and wet seasons from 2009 to 2012, and Escherichia coli ...


    By IWA Publishing

  • Case study - An air/ozone Sparge curtain to protect a municipal supply well

    Description Releases of petroleum contaminants from a retail gasoline station in a medium-sized California Central Valley town threatened a municipal supply well immediately adjacent and approximately 200 ft downgradient to the station. Methyl tert-butyl ether (MTBE) was present in groundwater concentrations up to 30,000 micrograms per liter (µg/L) and GRO up to 33,000 ...

  • Case study - Ozone sparging closure of an industrial VOC spill site adjacent to a water supply well site

    Description An undocumented surface spill at an active manufacturing facility located adjacent to a public water supply well field released chlorinated volatile organic compounds (PCE, and its breakdown products: TCE, c-DCE, and VC) into soils and groundwater.  The driver for site cleanup was three water supply wells located 200 feet downgradient of the site bounds.  The chosen ...

  • The use of shallow high resolution seismic reflection data to determine drilling locations at the Apache powder superfund site.

    INTRODUCTION Groundwater contamination at the Apache Powder Superfund Site in Cochise County, Arizona includes dissolved nitrate-N and perchlorate. Past studies have determined that these contaminants migrate laterally from a perched zone underlying Apache Nitrogen Products, Inc. operating areas into the shallow aquifer of the San Pedro River alluvium (shallow aquifer). The base of both the ...


    By Hargis + Associates Inc

  • Permanent Monitoring Systems for Seabed Leakage Detection

    Seabed leaks Where do they come from? Natural vents: Faults, Pockmarks, and Chimneys Melting hydrates Shallow gas layers Long term leakage along well casings (cracked cement) Injection: fault re-activation/fracturin Lost well control nd failing barriers The mysterious pockmarks at the ...


    By Franatech GmbH

  • Water monitoring commences in mines of West Africa

    As Sierra Leone looks to attract a new wave of mining investment in order to boost its economic profile, bringing water mine management standards in line with global best practices has become a priority. Government officials, academia, general citizens and companies have all become committed to improving standards with regards to water management in mining. As a key player in regulation ...


    By Aquaread Limited

  • Sludge accumulation in shallow maturation ponds treating UASB reactor effluent: results after 11 years of operation

    Polishing ponds are natural systems used for the post-treatment of upflow anaerobic sludge blanket (UASB) effluents. They are designed as maturation ponds and their main goal is the removal of pathogens and nitrogen and an additional removal of residual organic matter from the UASB reactor. This study aimed to evaluate organic matter and suspended solids removal as well as sludge accumulation in ...


    By IWA Publishing

  • EPA Technology News & Trends - Tacoma “Well 12A” Superfund Site

    The U.S. EPA Region 10 office uses an adaptive site management approach that relies on high-resolution site characterization (HRSC) techniques for strategic sampling at the Well 12A project area. This approximate one-square-mile project area is one of three at the 2.5-square-mile Commencement Bay-South Tacoma Channel Superfund site in Tacoma, Washington. The vicinity of Well 12A, one of 13 wells ...


    By TRS Group, Inc.

  • In-situ quality monitoring station in Lower Saxony

    Background 'Duemmer' is a shallow lake in the south-west of Lower Saxony; through the lake flows the river 'Hunte'. The catchment area spans 426 km2. With a surface of 12.4 km2 and an average depth of 1.1 m there is a water volume of approx. 14 million m3. Large parts of the lakeside are a nature reserve and the lake is a popular local recreation area. The lake suffers from strong nutrient ...


    By OTT HydroMet

  • Anaerobic bioremediation of groundwater using edible oil substrate EOS in an unconfined groundwater aquifer

    To treat groundwater contaminants in situ, enhanced anaerobic bioremediation processes can be stimulated through addition of soluble substrates. At a dry cleaners site located in San Jose, California, the goal was to find a substrate that is long lasting and easily distributed into the saturated soils. After evaluating several alternatives, in situ bioremediation using an emulsified edible oil ...


    By True Blue Technologies, Inc.

  • Anaerobic Bioremediation of Groundwater Using Edible Oil Substrate EOS® In an Unconfined Groundwater Aquifer

    ABSTRACT: To treat groundwater contaminants in situ, enhanced anaerobic bioremediation processes can be stimulated through addition of soluble substrates. At a dry cleaners site located in San Jose, California, the goal was to find a substrate that is long lasting and easily distributed into the saturated soils. After evaluating several alternatives, in situ bioremediation using an emulsified ...


    By EOS Remediation, LLC

  • Remote monitoring of groundwater pollution using geo-electric techniques in undulating sandy terrain, Western Australia

    Early-time transient electromagnetic sounding (TEM) and DC resistivity sounding techniques have been used to monitor remotely the changes with time of a groundwater pollution plume at a test site on a sand aquifer. A range of techniques for interpretation of TEM sounding data have been evaluated. All of these were successful in identifying expansion of the plume. The most plausible interpretation ...


    By Inderscience Publishers

  • Radon distribution in groundwater of Taiwan

    Radon levels were surveyed in 517 monitoring wells constructed in five major groundwater areas of Taiwan. The radon concentration in groundwater samples varied in a wide range from below the detection limit of 18 pCi/L up to 1,100 pCi/L. A worldwide comparison of reported groundwater radon levels was conducted. Overall radon levels in Taiwan groundwater are relatively low compared to other ...


    By Springer

  • The impact of plant water uptake and recharge on groundwater level at a site in the Loess Plateau of China

    Shallow groundwater in unconsolidated sediments represents a substantial water resource in the Chinese Loess Plateau. However, prior to development of the water supply for agriculture, annual and seasonal fluctuation of the recharge mechanism should be clarified. Since the region is arid, the effect of plant water uptake on groundwater fluctuation must also be assessed. A study was therefore ...


    By IWA Publishing

  • Isolate & sample up to 7 zones in one borehole

    CMT Multilevel Systems isolate and monitor up to seven discrete zones in one borehole; monitor 7 zones in the 1.7" (43 mm) System; 3 in the narrow 1.1" (28 mm) System. Both options are low cost. The single tube design makes them fast and easy to drill and install in one day. System flexibility allows port locations and monitoring strategy to be finalized right on site. CMT wells are ideal for ...


    By Solinst Canada Ltd.

  • Dynamics of nitrate & perchlorate in groundwater.

    The Apache Powder Superfund Site is located in Cochise County, Arizona, approximately 50 miles southeast of Tucson. The site was listed on the National Priorities List pursuant to CERCLA in 1990. Principal groundwater chemicals of concern (COCs) include nitrate-nitrogen (nitrate-N) and perchlorate. Concentrations of nitrate-N exceeding 500 mg/l and 2,300 mg/l have been detected in the “shallow ...


    By Hargis + Associates Inc

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