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PUBLICilEALTH 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 /> .P <br /> 209/468-3420 <br /> FIL E UOPY <br /> JEFF GRANBERRY <br /> SHELL OIL CO <br /> PO sox 4023 AUG 0 6 1998 <br /> CONCORD CA 94524 <br /> RE: WATERLOO SHELL <br /> SITE CODE: 1760 <br /> 4315 WATERLOO ROAD <br /> STOCKTON CA 95205 <br /> In the"Soil Boring Installation Report"dated May 21, 1996 prepared by Enviros, Inc., Enviros <br /> concluded the vertical extent of petroleum contamination at the site to be limited to less than 18 <br /> feet below surface grade (bsg) at the northwestern dispenser area, and less than 16 feet bsg at I <br /> the southeastern dispenser area based on the data obtained from the preliminary investigation <br /> which took place between February 21 and February 22, 1996. The report contended the vertical <br /> and horizontal extent of the contamination to be delineated and requested closure for the above- <br /> referenced site. j <br /> In the same above-referenced report, analytical results of the soil sample at 37 feet bsg from soil <br /> boring (SB)#4 at the former UST area were 0.025 parts per million (ppm)Methyl-Tert Butyl Ether <br /> (MTBE), 0.013 ppm Benzene, 0.13 ppm Toluene, 0.086 ppm Ethylene, and 0.074 ppm Xylenes. <br /> This is below the 18 feet bsg vertical delineation of the contamination at the northwest area <br /> asserted by Enviros in the report. Therefore, the vertical extent of the contamination at the <br /> northwest former UST area has not been defined. <br /> You are required to submit a workplan to define the vertical extent of the contamination at the <br /> northwest former UST area by October 3, 1998. <br /> If you have any questions, please feel free to contact Jeffrey Wong at(209)468-0335. <br /> I <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Jeffrey Wong, EHS, Trainee Margar Lagorio, RE <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB, Central Valley Region -Mark List <br /> c: Cambria -Diane Lundquist <br /> A Division of San Joaquin County Health Care Services <br />