Description
Main TitleLow-Flow Purging and Sampling Guidance
PublisherNew Jersey Department of Environmental Protection
Date Created2003
Subject (Geographic)New Jersey
Subject (Geographic - Hierarchical)
Country: United States
State: New Jersey
Subject (Topical)contamination; contaminated sites; toxins; soils; ground water; environmental monitoring; groundwater; wells; well monitoring
DescriptionThe procedures in this guidance document are specific to Low-Flow Purging and Sampling (LFPS) of monitor wells in New Jersey. The purpose of Low-Flow Purging and Sampling (LFPS) is to collect groundwater samples from monitor wells that are representative of ambient groundwater conditions in the aquifer. This is accomplished by setting the intake velocity of the sampling pump to a flow rate that limits drawdown inside the well. LFPS has three primary benefits. First, it minimizes disturbance of sediment in the bottom of the well, thereby producing a sample with low turbidity. Second, LFPS minimizes aeration of the groundwater during sample collection. Third, the amount of groundwater purged from a well is usually reduced as compared to conventional groundwater purging and sampling methods.
NoteThese procedures were developed in consideration of the USEPA-Region I guidance document dated July 30, 1996 (41 Kb PDF) and the USEPA-Region II guidance document dated March 16, 1998. In addition, the U.S. Geological Survey's (USGS) Techniques of Water-Resources Investigations, Book 9, National Field Manual for the Collection of Water-Quality Data was consulted. The reader is encouraged to review these guidance documents prior to performing LFPS. The procedures provided in the USEPA and USGS guidance must be followed except where they differ from the information provided below.
NotePurpose: To provide information Low-Flow Purging and Sampling
Data Life Cycle Event(s)
Type: Cataloging
Date: 2008-08-13 00:00:00.0
Creator: Rebecca Allsopp
Organization NameNew Jersey Environmental Digital Library
RightsThis resource may be copyright protected. You may make use of this resource, with proper attribution, for educational and other non-commercial uses only. Contact the contributing organization to obtain permission for reproduction, publication, and commercial use.