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tv <br /> ERI 205513 gSR22 Tosco Facility 5886 Stockton California October 29 2002 <br /> • RECOMMENDATIONS <br /> In addition to the environmental activities to be performed during fourth quarter 2002, <br /> (provided above), ERI recommends continuing quarterly depth to water gauging of on-site groundwater <br /> monitoring wells MW I through MW7S/MW7D and off-site wells MW8I, MW91, and MW 10I and <br /> reducing the water gauging frequency in wells MW8S/MW8D through MW10S/MW10D to a <br /> semi-annual schedule (first and third quarters) ERI recommends reducing the sampling frequency for <br /> on-site wells MW5D/MW5S, MW7D/MW7S, and off-site wells MW8S/MW8I/MW8D through <br /> MW 10S/MW I OI/MW l OD to a semi-annual schedule (fist and third quarters) ERI also recommends <br /> reducing the sampling frequency for oxygenated compounds including ethanol, TBA, DIPE, ETBE, <br /> and TAME, and lead scavengers including 1,2-DCA and EDB using EPA Method 8260B to an annual <br /> schedule (first quarter) <br /> DOCUMENT DISTRIBUTION <br /> ERI recommends signed copies of this summary report be forwarded to the following <br /> Ms Margaret Lagorio <br /> Site Mitigation Unit <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, Tlurd Floor <br /> Stockton, California 95202 <br /> • Mr Marty Hartzell <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> Please call Mr Glenn L Matteucci, ERI's project manager for the site, at(415) 382-5994 if you have <br /> questions regarding this summary report <br /> Sincerely, <br /> Environmental Resolutions, Inc <br /> �406 <br /> Nicole Keas <br /> Staff Geologist <br /> ED <br /> emLer0 <br /> Pie <br /> John B Bobbitt +Jb-OA <br /> R G 4313 '1%;. 4313 <br /> OF <br />