LEADER 03624oam 2200457 a 450 001 9910697334403321 005 20081024085454.0 035 $a(CKB)5470000002387590 035 $a(OCoLC)243613212 035 $a(EXLCZ)995470000002387590 100 $a20080812d2007 ua 0 101 0 $aeng 135 $aurmn||||||||| 181 $ctxt$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 10$aAnthropogenic organic compounds in ground water and finished water of community water systems near Dayton, Ohio, 2002-04$b[electronic resource] /$fby Mary Ann Thomas 210 1$aReston, Va. :$cU.S. Dept. of the Interior, U.S. Geological Survey,$d2007. 215 $avi, 19 pages $cdigital, PDF file 225 1 $aScientific investigations report ;$v2007-5035 300 $a"National Water-Quality Assessment Program, Source Water-Quality Assessments." 300 $aTitle from title screen (viewed on August 12, 2008). 320 $aIncludes bibliographical references (pages 14-16). 330 $aSource water for 15 community-water-system (CWS) wells in the vicinity of Dayton, Ohio, was sampled to evaluate the occurrence of 258 anthropogenic compounds (AOCs). At least one AOC was detected in 12 of the 15 samples. Most samples contained a mixture of compounds (average of four compounds per sample). The compounds that were detected in more than 30 percent of the samples included three volatile organic compounds (VOCs) (trichloroethene, chloroform, and 1,1,1-trichloroethane) and four pesticides or pesticide breakdown products (prometon, simazine, atrazine, and deethylatrazine). In general, VOCs were detected at higher concentrations than pesticides were; among the VOCs, the maximum detected concentration was 4.8 ?g/L (for trichloroethene), whereas among the pesticides, the maximum detected concentration was 0.041 ?g/L (for atrazine). During a later phase of the study, samples of source water from five CWS wells were compared to samples of finished water associated with each well. In general, VOC detections were higher in finished water than in source water, primarily due to the occurrence of trihalomethanes, which are compounds that can form during the treatment process. In contrast, pesticide detections were relatively similar between source- and finished-water samples. To assess the human-health relevance of the data, concentrations of AOCs were compared to their respective human-health benchmarks. For pesticides, the maximum detected concentrations were at least 2 orders of magnitude less than the benchmark values. However, three VOCs - trichloroethene, carbon tetrachloride, and tetrachloromethane - were detected at concentrations that approach human-health benchmarks and therefore may warrant inclusion in a low-concentration, trends monitoring program. 606 $aGroundwater$xPollution$zOhio$zDayton Region 606 $aDrinking water$xContamination$zOhio$zDayton Region 606 $aOrganic compounds$xEnvironmental aspects$zOhio$zDayton Region 615 0$aGroundwater$xPollution 615 0$aDrinking water$xContamination 615 0$aOrganic compounds$xEnvironmental aspects 676 $a363.739/420977173 700 $aThomas$b Mary Ann$01395316 712 02$aNational Water-Quality Assessment Program (U.S.) 712 02$aGeological Survey (U.S.) 801 0$bEJB 801 1$bEJB 801 2$bGPO 906 $aBOOK 912 $a9910697334403321 996 $aAnthropogenic organic compounds in ground water and finished water of community water systems near Dayton, Ohio, 2002-04$93464785 997 $aUNINA