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EDmur.o G B.Ow"Jr. cnvcnvun ........ M—E.Ronn,ouEz wn nc` Water Boards Central Valley Regional Water Quality Control Board 22 March 2012 Mr. John Trinkle 24551 Kasson Road Tracy, CA 95304-9518 NO FURTHER ACTION DETERMINATION, TRINKLE AND BOYS FLYING SERVICE, 31244 SOUTH HIGHWAY 33, SAN JOAQUIN COUNTY In a 16 December 2008 letter, California Water Quality Control Board, Central Valley Region (Central Valley Water Board) staff concurred with a monitoring well installation work plan and sampling program to evaluate if historical practices at Trinkle and Boys Flying Service, Assessors Parcel Numbers (APN) 255-31-039, and -040 had affected groundwater. In 1989 and 1992, four underground fuel tanks were removed. Most of the buildings were removed in 2006, and most of the site has been in agricultural production for several years. Four quarters of groundwater monitoring shows that pollutants are not detected. The groundwater monitoring wells were removed in November 2010. Additional details on the site history and investigation are found in the attached Memorandum. The Central Valley Water Board concurs with Trinkle and Boys Flying Service that the remaining levels of dicamba, 2,4-D, and dinoseb in soil do not pose a threat to human health, the environment, or waters of the State. On 9 August 2011, Central Valley Water Board staff circulated a fact sheet describing the site history and investigative results, and notifying interested persons of their opportunity to provide comments on the proposed environmental closure consideration. Concerns were expressed by a neighbor, and Central Valley Water Board staff sampled two domestic water supply wells and analyzed the well water for pollutants that had been found at Trinkle and Boys in the past. No pollutants relating to historical pesticide applicator operations were detected at or above laboratory reporting limits in either of the domestic supply well samples. 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. Issuance of a No Further Action Determination does not preclude future action by the Central Valley Water Board if subsequent monitoring, testing, or analysis of Trinkle and Boys Flying Service indicates that the remedial action standards and objectives were not KARL E. LONGLE,, So D, P.E..CHAIR ! PAMELA C. CREEDON, EXECUTNE OFF-CER 77020 Sun Center Drive#200.Rancho Cordova.CA 95070 } www waterboards.ca.gov/Centratvaltey "nF—Cl.Fn I-F.