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Quik Stop Station No 079 June 20, 2002 <br /> Turlock California Results of Additional Groundwater Assessment <br /> . 3 locations Groundwater analytical results indicate gasoline hydrocarbon impacts <br /> Weathered gasoline hydrocarbons are indicated by the presence of only TPHg and the <br /> heavier volatile aromatic compounds ethylbenzene and xylenes The one reported MTBE <br /> analytical result in the soil boring SB-1 groundwater sample is near the reporting limit (0 50 <br /> ppb) and below the State of California taste and odor threshold of 5 0 ppb <br /> Concentrations of TPHg, ethylbenzene and total xylenes should decrease by natural <br /> attenuation processes The near-reporting limit MTBE concentration does not represent a <br /> threat to sensitive receptors Horizon recommends that the site be granted no further <br /> investigation required status <br /> DISTRIBUTION <br /> Horizon recommends copies of this work plan be forwarded to <br /> Ms Rebecca Setliff Mr Marty Hartzell <br /> San Joaquin County Regional Water Quality Control Board <br /> Environmental Health Department Central Valley Region <br /> 304 East Weber, Third Floor 3443 Routier Road, Suite A <br /> Stockton, California 95202 Sacramento, California 95827-3003 <br /> LIMITATIONS <br /> The work described herein and the preparation of this report was conducted in accordance <br /> with the methods and procedures in the attached field methods, and generally accepted <br /> standards of environmental geological practice in California at the time of the investigation <br /> The investigation was conducted solely for the purpose of evaluating environmental <br /> conditions of the soil and groundwater with respect to gasoline-related hydrocarbons at the <br /> • site No soil engineering or geotechnical references are implied or should be inferred <br /> 079rpt5 02 <br /> Project No 7079 13 HORIZON ENVIRONMENTAL <br />