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PUBLIC H-hALTH -SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> JOSEPH ALDRIDGE U <br /> P y <br /> ULTRAMAR .INC <br /> P O BOX 466 JUL O $ tggg . <br /> HANFORD CA 93232-0466 <br /> RE: Beacon Station #492 <br /> 470 N_ Main Street <br /> Manteca, CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD)has <br /> reviewed the"UST Closure Report" dated December 21, 1998, prepared by BSK for the above <br /> referenced site. <br /> i <br /> Analytical results of the soil samples collected from beneath the underground storage tanks <br /> (USTs) one and two evidenced low levels of MTBE at 13.5 to 15 feet below surface grade(bsg). <br /> Additional soil was removed from the south end of the excavation where UST one was located. <br /> Contaminants were not detected in the soil sample collected at 17 feet bsg from the bottom of the <br /> additionally excavated area. <br /> Contaminated soil was also found beneath the northeast and northwest dispensers. The <br /> northeast dispenser area had additional soil removed and soil samples were collected from 8 feet <br /> and 12.5 feet bsg and analyzed for contaminants. Contaminated soil remains.in the dispenser <br /> areas. <br /> The soil at this site is sandy and groundwater has been at 15 feet bsg. Monitoring well(MW)4 is <br /> located in the northeast portion of this site which was determined to be the direction of <br /> groundwater flow during past investigation at the site. A groundwater sample should be collected <br /> from this well and analyzed for BTEX, MTBE, and TPH as gasoline. The results of the analysis of . <br /> the groundwater sample will determine whether further investigation will be required. . <br /> Please contact PHS/EHD staff 48 hours prior to scheduling the sampling of the well so that they <br /> may witness the activity. <br /> If you have any questions contact me at(209)468-3449. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Margaret Lagorio, Supervising REHS <br /> Site Mitigation Unit <br /> c: BSK—Richard Johnson <br /> A Division of San Joaquin County Health.Care Services <br />