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Trinkle& Boys Environmental Closure 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. <br /> t. . <br /> C- <br /> M <br /> LEGENDs� <br /> M A <br /> 1' MorobxWWelLocaim(M9) y,C o <br /> SoilBc�gLocaims(2M) Cyt <br /> PAPerty Bo-d— <br /> ArffmXWeIlLocaim(1991) n N xc <br /> cFrr <br /> orwlBasest(1989) <br /> SoilBgLecaions(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 /> SwF <br /> Amy Terrell elz-_- <br /> Regional Water Quality Control Board _ <br /> 11020 Sun Center Drive, #200 r <br /> ( r n <br /> Rancho Cordova, CA 95670 <br /> Water Boards (916)464-4680 <br /> aterrell@waterboards.ca.gov <br />