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PUBLIC HgALTH SERVICIS pQ,...N. <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 />� <<FijR� <br />2091468-3420 <br />RICHARD YEHLE <br />DISTRICT ENVIRONMENTAL COORDINATOR SAN 7 ZQQ <br />US POSTAL SERVICES <br />3775 INDUSTRIAL BLVD <br />WEST SACRAMENTO CA 95799 <br />(a 00 <br />7 <br />RE: U. S. Postal Service <br />3131 Arch Road <br />Stockton, CA <br />San Joaquin County Public Health Services, Environmental Health Division <br />(PHS/EHD) has reviewed the information in our file concerning the above <br />referenced site. <br />On May 14, 1998 two 12,000 gallon underground storage tanks (USTs) were <br />removed from the site (one tank had contained diesel and the other tank had <br />contained gasoline). There was a cement slab beneath the USTs and soil <br />samples were not collected from the native soil beneath the slab, as required, to <br />demonstrate there had not been a release of fuel to the subsurface. Soil <br />samples were collected from the soil stockpile generated during the removal <br />activities. Soil samples were also collected beneath the UST piping and the two <br />fuel dispensers. PHSIEHD staff noted odor beneath the diesel dispenser area. <br />Analytical results of the soil stockpile samples were non -detect for contaminants, <br />except 1.81 mg/kg of Total Petroleum Hydrocarbons as diesel (TPH-d). The <br />stockpiled soil was returned to the UST excavation. The analytical result of the <br />soil sample collected beneath the diesel dispenser for TPH-d was 817 mg/kg. <br />The analytical results of the soil sample collected beneath the piping for Methyl <br />tert Butyl Ether (MTBE) was .340 mg/kg. <br />At the time of the above UST removals, PHS/EHD staff noted seepage from the <br />Product Oil and Waste Oil UST overspill areas and required correction of the leak <br />under permit and inspection of PHS/EHD. <br />On July 7-8, 1998 4 soil borings were drilled near the slab beneath the former <br />12,000 gallon USTs and soil samples were collected at 15 feet below surface <br />grade. Analytical results of the 4 soil samples were non -detect for contaminants, <br />except for one sample that had 2.47 mg/kg of TPH-d. PHSIEHD does not <br />consider those samples representative of the soil beneath the cement slab where <br />the USTs were located. <br />A Division of San Joaquin County Health Care Services <br />