Brown and Caldwell Home Page
Technical Papers RECENT PAPERS    ALL PAPERS

Brown and Caldwell engineers and scientists are technical and thought leaders in the environmental sector. Meet the people who have been advancing innovation for more than 70 years.
Author      Title/Abstract      


High-Volume Sampling for Ultra-Low Water Qualilty Analyses
Author: Michael Milne; Raleigh Farlow (DMD); Char Naylor (Puyallup Tribe of Indians)
Date: 5/106
StormCon Conference 2002

Some constituents of concern to water quality managers have very low water quality criteria. For example, EPA’s National Toxics Rule (NTR) criteria for arsenic, mercury, benzo(a)pyrene, and PCBs are 0.018, 0.14, 0.0028, and 0.000044 ìg/L, respectively (to protect human health based on consumption of water and organisms). These criteria are below the reporting limits that can be reliably achieved using typical sampling and analytical methods. Thus, water quality managers using typical sampling and contract analytical methods may have considerable uncertainty as to whether such constituents are actually present at levels that exceed criteria. To reduce such uncertainty, “ultra clean” sampling and analytical methods have been developed for some constituents, such as metals. However, ultra clean methods can be costly and difficult to apply in some field situations. This paper describes an alternative approach, wherein high-volume sampling and preconcentration techniques were used to achieve very low reporting limits for metals and organics. Two case studies are presented, one in a river tributary to Puget Sound and the other in the Columbia River.

This library contains published materials for which copyrights may be owned by entities other than Brown and Caldwell, but which are stored for limited uses by BC employees. Technical papers authored by BC employees generally may be printed and shared electronically with clients and prospective clients outside BC. Technical papers cannot be sold, and technical papers shared outside BC must have proper attribution of the original sponsoring organization or conference where the paper was presented. This attribution is embedded in each technical paper file when it is loaded into this library. Published articles from magazines or trade journals which are stored in this library are FOR INTERNAL USE ONLY and SHOULD NOT be distributed to clients or others outside BC, without express permission of the copyright owner. For questions regarding copyrights associated with any document in this library, or questions regarding copyrights in general, contact the Legal Department.