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Californ Regional Water Quality Ce-trol Board <br /> '-�`. • of <br /> Central Valley Region <br /> Karl E. Longley,ScD, P.E.,Chair <br /> Linda S.Adams Arnold <br /> Secrerurr for Sacramento Main Office <br /> 11020 Sun Center Drive#200.Rancho Cordova.California 95670-6114 Gor�er��or Schware?-nol er <br /> F_nru�onmenrul <br /> Prorcc nnn Phone(916)464-3291 •FAX(916)464-4W <br /> http//,,v%v%%.Haterboards ca.gov;ccrtMCMWED <br /> 1 May 2008 <br /> MAY 0 5 2008 <br /> Mr. John Trinkle ENVIRONMENT HEALTH <br /> 24551 Kasson Road pERRT!SER1/lCE3 <br /> Tracy, CA 95304-9518 <br /> SITE INVESTIGATION WORK PLAN, TRINKLE & BOYS, 31244 S. HIGHWAY 33, TRACY, <br /> SAN JOAQUIN COUNTY <br /> The site at 31244 S. Highway 33 in Tracy had been used by an aerial pesticide applicator <br /> between about 1949 and 1997. At the request of Central Valley Regional Water Quality <br /> Control Board (Regional Water Board) staff, Trinkle & Boys provided the 3 April 2008 Limited <br /> Subsurface Investigation Work Plan prepared by Advanced GeoEnvironmental, Inc. In this <br /> letter, Regional Water Board staff conditionally concur with the Work Plan. <br /> Soil Samples <br /> Soil samples will be obtained from one and three feet below ground surface and shall be <br /> analyzed for organochlorine compounds by EPA Method 8081, organophosphate compounds <br /> by EPA Method 8141 , chlorinated herbicides by EPA Method 8151 and carbamate <br /> compounds. EPA Method 8318 is proposed for carbamates, which does not include diuron, a <br /> constituent that has been found at this site in the past. If Trinkle & Boys use EPA Method <br /> 8318, it should add analyses by EPA Method 532, which includes diuron, but does not include <br /> carbamates. Alternatively, Trinkle & Boys may use EPA Method 632, which includes diuron <br /> and carbamates. <br /> Two of the easternmost soil samples proposed along the runway (67 and B10) should be <br /> repositioned to either side of the runway on the west side of the Jerusalem Drain Line. This <br /> increases the sample density where the operations areas had been. Soil samples obtained <br /> adjacent to the runway (B5 through B10) should additionally be analyzed for polynuclear <br /> aromatic hydrocarbons by EPA method 8310. In the Work Plan, EPA Method 8082 was also <br /> proposed for samples, which analyzes for polychlorinated biphenyls (PCBs). Regional Water <br /> Board staff believe that analyses for polynuclear aromatic hydrocarbons would provide more <br /> information about past activities than analyses for PCBs. <br /> Ground Water Samples <br /> Trinkle & Boys proposes to obtain a grab groundwater sample from beneath the sump on the <br /> north side of the runway, and from the sump discharge point on the south side of the runway. <br /> These groundwater samples are proposed to be analyzed for all analytical suites proposed for <br /> soil samples in addition to total petroleum hydrocarbons by EPA Method 8015M, and volatile <br /> organic compounds, including benzene, toluene, ethylbenzene and xylene, by EPA Method <br /> 8260B. <br /> California Environmental Protection Agency <br /> C". Recycled Puper <br />