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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> r.� <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95 10 a oR�`" <br /> 209/468-3420 ) Vf <br /> GUARDINO and CRAWFORD MAILED MAR 2 71996 <br /> PO Box 1689 <br /> STOCKTON CA 95201 <br /> RE: GUARDINO and CRAWFORD SITE CODE: 1112 <br /> 517 W FREMONT ST <br /> STOCKTON CA 95203 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed <br /> the September 1995 Soil Probing Installation Report prepared by Advanced Geo Environmental for the <br /> above referenced site. <br /> Three probes were advanced at the site. One probe near the dispenser, one near the former UST and <br /> one downgradient of the UST. A water sample was obtained from the downgradient probe. The <br /> general gradient in the area was obtained from data at nearby sites. <br /> The results of the investigation indicate that there is minor impact to groundwater downgradient of the <br /> former UST. The concentration of benzene in the groundwater sample was 1 .3 ppb. <br /> The soil results indicate that there is minor soil contamination beneath the former UST location in the 20 <br /> foot sample. Soil contamination beneath the former dispenser is present in the 10, 20 and 25 foot <br /> samples. Preliminary data indicates that the groundwater may have been impacted by a dispenser leak. <br /> Although the concentrations of petroleum hydrocarbons confirmed by laboratory analysis from samples <br /> at the site are very small, PHSIEHD recommends additional investigation to determine the full extent of <br /> soil and groundwater contamination and to collect data to develop a remedial altemative for this site. In <br /> order to remain in compliance with the Corrective Action Requirements a workplan to define the extent of <br /> soil and groundwater contamination shall be submitted to this agency by May 13 1996. <br /> For further information , please call Steve Sasson at (209) 468-3459. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> even Sass n e for REHS Marga, REHS <br /> Site Mitigation Unit Lead Senior <br /> SS <br /> cc: Annabelle Mackey- SWRCB <br /> Elizabeth Thayer-CVRWQCB <br /> Bill Little-Advanced GeoEnvironmental <br /> A Division of San Joaquin County Health Care Services <br />