The goal of environmental groundwater monitoring is to provide information on changes in groundwater environmental conditions at the site or in a specific medium, over time, usually at fixed locations. This information, in turn, is often used in making decisions regarding the need to do additional work at the site, usually based on potential risks … Continue reading
Site characterization is the foundation of most environmental projects, whether they are
focused on long-term monitoring, risk assessment, remediation, or some other goal. After a baseline of the site has been obtained, further project work may require monitoring. The goal of monitoring is to provide information on changes in environmental conditions at the site or in a specific medium, over time. This information, in turn, is often used in making decisions regarding the need to do additional work at the site.
… Continue reading
Before the construction of the groundwater monitoring wells, it is necessary to conduct a preliminary investigation of the site, to determine the subsurface site stratigraphy (e.g., soil type and bedrock determination, and to confirm the approximate distribution of the contaminants. This will aid in the selection of the appropriate monitoring well construction and the depth … Continue reading
The requirements to design the environmental monitoring well. The main purpose of groundwater monitoring wells is to obtain representative groundwater data, which may include groundwater level, hydraulic conductivity, and groundwater sample analysis data. There are some common errors with the well installation and design for groundwater monitoring wells that may lead to obtain non-representative data. … Continue reading
Today, most of the monitoring wells will be constructed of polyvinyl chloride (PVC) or stainless steel, followed by low carbon or galvanized steel. Other materials (ABS, PE, PP) are rarely suitable for the construction of environmental monitoring wells, or the size of production is usually not suitable for the construction of monitoring wells. In selecting … Continue reading
Abs: Purging strategies, as described in ASTM Standard D 6452 (ASTM, 2004g), are divided into two general categories: those appropriate for high-yield sampling points (points that do not go dry during purging and sampling) and those appropriate for low-yield sampling points (points that may go dry during purging and sampling). Although it is important to … Continue reading
The SAP should be written by an experienced practitioner who has relevant field experience and who can identify potential sources of error and bias in each component of the ground-water sample collection process. Implementation of a comprehensive and well thought out SAP should ensure that ground-water sample collection procedures are consistent from one sampling event … Continue reading
Another group of parameter-specific field protocols that must be evaluated and included in the SAP are methods for sample pretreatment, including sample filtration and physical and chemical preservation. ASTM has published Standard Guides that address both types of sample pretreatment. ASTM Standard D 6564 (ASTM, 2004k) provides a detailed guide for field filtration of ground-water … Continue reading
Abs: Real-time measurement technologies include any data generation method that enables reliable measurement or collection and analysis of environmental media in a time frame that facilitates execution of a DWS. These measurements typically result in a much greater density of information and are available to direct field activities in time frames shorter than those commonly … Continue reading
In the field of contaminated sites with water samples and soil samples requiring rapid screening analysis, compared with the traditional way of sample analysis in an off-site laboratory, portable gas chromatography can be used for rapidly obtaining analytical results, where a laboratory may need an average analysis time of 2 weeks, including a service … Continue reading
