Full Description

The objectives of this study were to examine the short-term andlong-term impact of partial lead service branch (LSB) changeover on lead concentrations measured at the consumers'taps. The impacts from partial LSB changeover were also compared with the results fromperforming complete changeovers as well as from performing no service branch work at all.The approach used to accomplish these objectives was to perform lead analyses at twenty-onehomes with lead service branches. These sites were divided into four groups. For five of thesesites, the Greater Cincinnati Water Works (GCWW) replaced the entire service branch from thewater main up to the house. For another 5 sites, GCWW performed partial replacement of theservice branch from the water main to the property line leaving the original lead branch in tactfrom the property line into the house. At 6 sites, GCWW performed partial replacements, butcovered the freshly cut end with a Teflon shrink wrap tubing. The final five sites acted ascontrol sites with no work performed on the lead service branch. All sites were sampled initiallyone week after work was performed (except the control sites), and at one month intervals for ayear. Sampling at all sites consisted of a first draw after standing a minimum of six hours, after athree minute flush, and after a ten minute flush. The paper goes on to discuss topics that include: description of sampling sites; description of line replacement; sample collection and analysis; water quality; results of initial spike; and, steady state lead concentration. Includes 10 references, tables, figures.

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Edition: Vol. - No. Published: 06/01/2006 Number of Pages: 11File Size: 1 file , 290 KB