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Trinkle & Boys Environmental CIG Request 9 August 2011 <br /> Soil and Groundwater <br /> Environmental investigations were conducted under the oversight of the Central Valley Water <br /> Board. A study in 1989 detected DDT and endosulfan in soil. However, a follow-up study in 2008 <br /> failed to detect any DDT or endosulfan, showing that these compounds had degraded. Some soil <br /> samples from 2008 contained dinoseb at concentrations below thresholds of concern. <br /> In 1989, groundwater from one of the monitoring wells contained low concentrations of silvex, <br /> bromacil, carbaryl, carbofuran and methomyl. These concentrations were below concentrations of <br /> concern to human health, and were not detected in four quarters of groundwater monitoring in <br /> 2009 and 2010. Because pollutants are not detected at concentrations of concern to human <br /> health or the environment, Central Valley Water Board is considering closing the site. yy <br /> 9R; <br /> RUNWAY <br /> LEGEND S�9T A <br /> 0 <br /> Moniobrq WQ Lorlim(20J09 1 1PI g <br /> 'cy ■ <br /> Soil Bmrq Loc4xaf(200:3) <br /> StL:rAn'zFlmu— fill <br /> .L MomioxigWeIlLocsim(1991:1 N <br /> C�rurelBassfLa�) <br /> Soil Boa*Locl rg(1989) Figure 2. Monitoring Well and Soil Sample Locations <br /> Additional Information <br /> Additional information can be viewed online at www.geotracker.waterboards.ca.gov. To use <br /> Geotracker to find information on this site, type 31244 Highway 33, Tracy in the Search box, <br /> and click Search. On the map that appears, click on the green box, then click on Trinkle & <br /> Boys Flying Service. You may also contact Amy Terrell of the Central Valley Water Board for <br /> more information. <br /> This is a 30-day Public Comment period. <br /> Please provide comments by 13 September 2011 <br /> If you have any questions, or wish to provide comments on the closure request, please <br /> contact the Central Valley Water Board's project manager listed below. <br /> o cAiip0 <br /> Amy Terrell ,��_ . o <br /> Regional Water Quality Control Board —_ <br /> 11020 Sun Center Drive, #200 <br /> oa,., Rancho Cordova, CA 95670 .o <br /> Water Boards (916) 464-4680 <br /> z <br /> aterrell@waterboards.ca.gov 9(�9r�AOUALYTY�O��O <br />