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EoruHo G. Bno—J. } J�i f.OV[nrlOn C E L I F G N N l w MATTHEW RoomovEZ EECNETnNv cnN Water Boards FIIVIIrUHMCM wL hlrUrt lrW Central Valley Regional Water Quality Control Board X--Fe - `, , 22 March 2012 >J�AC� ' S-iv.%-i091'E9'1ki tvt s Mr. John Trinkle pEc�ftRflSc 24551 Kasson Road Tracy, CA 95304-9518 r IYV a�L�ll TINE�r1k MC I fVIY LJL TCRfYft%rM T(VIC, r-111V LC"t IV �C�I .� I'L%F1�1fG .3�PC vI uC, 31244SOUTHH1GHWAY 33, SAN 1JOAQU1N 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. A-I J:a:.......I J.,a..:l.. al..,., 'a,. L.:..a,.�.. J L.., .J . 4.L-�. aa....L....J /'1LJUILIdl lal details of l U le site i llstoi– anud investigation are found III LI le a taol ICU 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. LONGLEy SCD, P.E., CHAIR I PAMELA C. CREEOON, EXECUTIVE OFFICER 11020 Sun Center Drive#200,Rancho Cordova,CA 95070 1 www,walerboards.ce.gov/centralvalley L".'(;'c'r0 1`.-.