AWWA WQTC64084

A field testing program was conducted in Seattle Public Schools to assess the variability oflead (Pb) at drinking water sources after implementing a lead remediation program. Fourdifferent source configurations were identified as typical end-use plumbing. Twelve drinkingwater sources were selected based on statistical correlations to represent each configurationfor a total of forty-eight locations tested. Sixteen samples (8 first draw and 8 flushedsamples) were collected from each source after overnight standing. Results indicate that 12samples out of a total of 768 (1.6%) exhibited Pb >10 µg/L, 4 samples (0.5%) exhibited Pb>20 µg/L, and none were greater than 30 µg/L. The highest Pb levels and greatest variabilityoccurred in samples from configurations with standard brass materials (up to 8% Pb).Relatively low Pb concentrations and variability were observed for sources with low-leadbubblers and new components. The mean concentration of Pb for allsamples was 2.8 µg/L after remediation compared to 20.8 µg/L before remediation. Includes 11 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2006

Number of Pages:

19

File Size:

1 file , 460 KB