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1 <br /> r <br /> C-)w- DAMES & MOORE <br /> A DAMES&MOORE GROUP COMPANY <br /> Mr. Michael Infurna <br /> San Joaquin County <br /> April 30, 1998 <br /> Page 2 <br /> • Installing one soil probe to a depth of 20 feet below ground surface, or first encountered <br /> groundwater using a Geoprobe, or similar, soil sampling rig in the vicinity of the septic tank; <br /> • Collecting one soil and one groundwater grab sample from the soil probe; <br /> • Submitting each of the samples to an analytical laboratory for chemical testing of TPH-g and <br /> TPH-d by EPA Method 8015 modified, benzene, toluene, ethylbenzene, xylene, and methyl <br /> teritary butyl ether by EPA Method 8020, semi-volatile organic compounds by EPA Method <br /> 8270, volatile organic compounds by EPA Method 8010, and metals by EPA Method <br /> 7000/6010. Chemical testing will be conducted on a standard turn-around basis (5 days); <br /> • Collecting one tap water sample from the onsite building; <br /> • Submitting the tap water sample to an analytical laboratory for chemical testing of TPH-g <br /> and TPH-d by EPA Method 8015 modified, benzene, toluene, ethylbenzene, xylene, and <br /> methyl teritary butyl ether by EPA Method 8020, semi-volatile organic compounds by EPA <br /> Method 8270, volatile organic compounds by EPA Method 8010, metals by EPA Method <br /> 7000/6010 and total coliform and fecal count. Chemical testing will be conducted on a <br /> standard turn-around basis (5 days);and, <br /> • Preparing a data transmittal letter presenting the results of the investigation. <br /> Dames & Moore appreciates the opportunity to work with you on this project. Please call us if you <br /> have any questions regarding the activities outlined in this workplan. <br /> Very truly yours, <br /> Dames & Moore <br /> Randolph C. Brandt, R.G. <br /> Managing Principal <br /> cc: Ms. Gillian Evans, D&M <br /> Offices Worldwide <br />