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monitoring is not required" and requests a work plan for the destruction of _ the ground water monitoring wells. • August 2011 Public Notice, Environmental Closure Request from California Environmental Protection Agency. The document states that "a study in 1989 detected DDT and endosulfan in the soil. However, a follow-up study in 2008 failed to detect any DDT or endosulfan, showing that these compounds had degraded... In 1989, groundwater from one of the monitoring wells contained low concentrations of silvex, bromacil, carbaryl, carbofuran and methomyl. These concentrations were below concentrations of concern to human health, and were not detected in four quarters of groundwater monitoring in 2009 and 2010. Because pollutants are not detected at concentrations of concern to human health or the environment, Central Valley Water Board is considering closing the site." • January 2012 letter from Central Valley Regional Water Quality Control Board, Rationale for Considering No Further Action. The letter summarizes the issues surrounding the Trinkle & Boys property as follows: "The site has been an airstrip and operations area for aerial pesticide applicators from 1949 to 2001, when the current owners purchased the property. In 1986, pesticides were detected in a wastewater discharge area, and in 1987 and 1989, Cleanup and Abatement Orders requiring investigation were issued to different operators. In 1989, three underground fuel tanks were removed without permits. In 1990, Trinkle and Boys conducted an investigation and the Cleanup and Abatement Orders were rescinded. In 1992 one more underground fuel tank was removed without a permit, although San Joaquin County concurred that confirmation samples showed that no pollution occurred relating to this tank." The letter states that "residual soil contamination concentrations are below human health protective screening levels, based on California Human Health Screening Levels (CHHSLs) for residential land uses and Environmental Protection Agency Preliminary Remediation Goals (PRGs) for residential land uses. Pollutants identified in grab groundwater samples that exceeded water quality objectives (dichlorobenzene and diuron) were not detected in four quarters of groundwater monitoring." • March 2012 letter from Central Valley Regional Water Quality Control Board, No Further Action Determination. The letter states that "Trinkle and Boys Flying Service has satisfactorily completed site investigation and achieved applicable remedial action standards and objectives. Therefore, no further action is required as of the date of this letter." Selections from the documents discussed above have been included in Appendix 6 of this report. LOGE 1506 9