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Copy of Sampling Techniques for Grounwater
Transcript of Copy of Sampling Techniques for Grounwater
for Mario Casteneda
Gateway Community College
Hydrologic Program WRT 260
Ground Water Sampling Techniques Monitor Wells Monitor wells are specifically set up to obtain sample data from groundwater these wells usually don have a pump that is installed. These observation wells are used to collect chemical, biological and physical data. Collection of samples can be used with low capacity pumps or portable pumps. Water Supply Wells Water supply wells are wells that have been installed directly for public, commercial, irrigation, domestic and industrial water usage. These wells are normally equipped with a high capacity pump to deliver high volumes of water. Before sampling a well obtaining information such as construction of the well and historical data of the well is important. The USGS has complied data of most wells using the National Water Information System (NWIS) this is an electronic file used to store data records of the wells. These files are helpful when out in the field. Site inventory is an office inventory of the selected wells where records and historical background of the well is used to determine the suitability of the well site to meet the objective of the study. Quality Control Sampling Techniques for Observation Wells Well Purging: Well purging involves removing standing water from a well. The purpose of purging is to reduce the chemistry and biochemical elements caused by the practices used for the well construction,installation and development. The purging procedure consists of extracting at least three of more well volumes of standing water while monitoring the level of water and also monitoring the stabilization of basic routine field measurements such as temperature, pH, conductivity, turbidity and dissolved oxygen. Sampling Processes Sampling Techniques for Supply Wells Step 1: Safety and Site Preparations
Step 2: Measure water level
Step 3: Purge the well and monitor filed meausrements
Step 4: Withdraw groundwater
Step 5: Collect and Process the sample
Step 6: Clean Equipment Collection and analysis of quality control samples are very important to the integrity of the sample. USGS also mandates this type of sample analysis. The purpose of QC sampling is to quantify, identify and document the bias and variability in data that come from the collection, processing and handling of samples. Different types of Quality Control Samples Blank Samples
Sequential Replicate Samples