作为对味道和气味投诉的常规回应，东湾市政公用事业区（EBMUD）排水并清洁了一个65 mil gal的钢筋混凝土蓄水池，该蓄水池用于储存处理过的水。用于密封地板之间接缝的聚硫嵌缝材料状况不佳，需要更换。对损坏的嵌缝进行分析，以确定在处理前是否需要特殊处理。分析表明，多氯联苯含量约为20%。测试证实，填塞物不会对饮用水质量构成威胁；然而，它被不适当地排放到附近的排水道，从而污染了土壤。EBMUD正在完成一项耗资200万美元的排水管道修复工程，并正在调查其所有配水系统水库中密封剂中的多氯联苯。除非妥善处理，否则PCB- 满载的密封剂对EBMUD和其他具有类似设施的供水设施构成了巨大的负担。包括6个参考文献，图。

In routine response to taste and odor complaints, the East Bay Municipal Utility District (EBMUD) drained and cleaned a 65-mil-gal reinforced-concrete reservoir used to store treated water. The polysulfide caulking material used to seal joints between floor panels was in poor condition and required replacement. The deteriorated caulking was analyzed to determine whether it would require special handling before disposal. Analyses indicated that the caulking contained about 20 percent polychlorinated biphenyls (PCBs). Tests confirmed that the caulk did not pose a threat to drinking water quality; however, it was inappropriately released to a nearby drainage course, thus contaminating soils. EBMUD is completing a $2-million remediation and restoration of the drainage course and is investigating PCBs in sealants in all its distribution system reservoirs. Unless disposed of properly, the PCB-laden sealants pose a tremendous liability for EBMUD and for other water utilities with similar facilities. Includes 6 references, figure.