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ERV ICES P� <br /> PUBLIC HEALTH SER oUtN <br /> SAN JOAQUIN COUNTY <br /> i <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O . Box 388 • Stockton, CA 95201 8 ^ <br /> 209/468-3420 o\1 ' L <br /> � <br /> BOB MULFORD j1IGtf J� <br /> FRONTIER TRANSPORT INC <br /> 3577 W PHILADELPHIA <br /> CHINO CA 91710 <br /> RE: FRONTIER TRANSPORT INC SITE CODE : 2251 <br /> 425 LARCH ROAD <br /> TRACY CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed <br /> the October 16, 1996 Site Characterization Report prepared by The Twining Laboratories for the above <br /> referenced site. <br /> The recommendations in the report include installation of additional monitoring wells and to assess the <br /> need for active soil and or groundwater remediation . PHS/EHD recommends that one additional <br /> upgradient and one additional downgradient well be installed to obtain the plume dimensions. The <br /> need for active remediation will be based on the presence of conditions conducive to natural <br /> attenuation, These conditions include but are not limited to a survey of wells within 2000 feet of the <br /> site, geotechnical parameters needed for fate and transport modelling such as intrinsic permeability, <br /> hydraulic conductivity and bulk density, and PNK values for phosphate, nitrogen and potassium and <br /> dissolved oxygen necessary for bacterial hydrocarbon degradation . <br /> Once the plume is completely assessed a feasibility study to determine the most cost effective method <br /> of remediation shall be conducted. At least two different alternative treatment methodologies shall be <br /> evaluated. One of the treatment technologies should be natural attenuation. <br /> A workplan to install two additional monitoring wells and to obtain site specific geotechnical data shall <br /> be submitted to this agency by December 30, 1996 , <br /> If you have any questions, please contact Steven Sasson at (209) 468-3459, <br /> Donna Heran, REHS, Director <br /> Environ ntal Health Division <br /> Steven Sass n , Senior EHS Margare/Laaorio, REHS <br /> Site Mitigation Unit Supervisor <br /> SS <br /> c: SWRCB , Underground Storage Tank Section - Mel Jacobo <br /> c: CVRWQCB, Central Valley Region - Elizabeth Thayer <br /> c: The Twining Laboratories - Patricia Jones <br /> .i D1 % ston of fan joaq,.Jn Counn Health Care Ser% ices <br />