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f _t <br /> PUBLIC 1EALTH SER) " ICES <br /> pully <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION y :� <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer r <br /> 304 E.Weber Ave., 3rd Floor • P. O. Box 388 • Stockton, CA 95201-0388 �q.., :.•�P <br /> 209/468-3420 <br /> Q <br /> DAN KIRK : 7 <br /> SHELL OIL COMPANY _ <br /> PO BOX 4023 MAULED AUG 2 91995 <br /> CONCORD CA 94524 <br /> RE: WATERLOO SHELL SITE CODE: 1760 <br /> 4315 WATERLOO ROAD <br /> STOCKTON CA 95205 <br /> San Joaquin County Public Health Services, Environmental Health Division(PHS/EHD)has reviewed the April 19, <br /> 1995 Underground Storage Tank Closure Report prepared by Fugro West, Inc. of Roseville Ca for the above <br /> referenced site. <br /> The report describes the purpose, scope of work, some background information, the results of the removal, the <br /> disposition of the soil stockpile and draws conclusions based upon the data. <br /> The conclusions of the report are that the former tank pit was excavated to a depth of 19 feet. Samples collected <br /> from the 18 and 19 foot depth contained no detectable concentrations of benzene. <br /> PHS/EHD has determined that residual contamination exists in the eastern side of the excavation at the 14 foot depth <br /> as indicated by sample WE14 with an analytical result of TPHg 380 ppm, the east side of the dispenser island <br /> closest to Waterloo Road as indicated by sample PL9 with an analytical result of TPHg 1600 ppm and PL13 with <br /> an analytical result of TPHg 1700 ppm, and the western side of the dispenser located closest to the building as <br /> observed during the sampling of PL12. <br /> PHS/EHD recommends that you investigate the extent of the existing soil contamination in order to design a method <br /> of treatment that will reduce the level of soil contamination and the potential threat to groundwater. Please submit <br /> a workplan for the investigation by September 25, 1995. The workplan should be scheduled for implementation <br /> within two weeks of approval by this agency. <br /> For further information please contact Steven Sasson at (209.) 468-3459. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> iteven Sasson, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> SS <br /> cc: SWRCB - Underground Storage Tank Section - Lori Casias <br /> cc: RWQCB - Elizabeth Thayer <br /> cc: Fugro West - Steve Osborne <br /> A Division of San Joaquin County Health Care Services <br />