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1 �OARO OF TRUSTEES Stir. JOAOUIN LOCAL HEALTH DIS. i%;T SERVING 16 Al Crow,Pres San Joaquin County Earl Pimentel,Vice Pres 1601 East Hazelton Avenue City of Manteca Tommy Joyce,Sec'y Stockton, California 95205 City of Escalon James F Culbertson City of Lodi John D Mast,M D JOGI KHANNA, M 0, M P H, DISTRICT HEALTH OFFICER City of Tracy Virginia Mathews Cary of Ripon Thomas Schubert,D V M San Joaquin County Daphne Shaw City of Stockton ' Harvey Williams,Ph D San Joaquin County December 30, 1988 John Bourdon, etal E -Z Gas MiniMart P. O. Box 6754 Modesto, CA 95355 RE: 1405 S MCHENRY; ESCALON SUBSURFACE ENVIRONMENTAL INVESTIGATION Please be advised that this office has reviewed the above referenced work plan. We have found the plan to be adequate provided the following considerations are addressed. 1: The suggested sampling intervals within the soil borings is 1 satisfactory; however, the samples obtained by utilizing field techniques should also be verified with a bottom-of-boring soil sample submitted for laboratory analysis. 2: Pursuant to telephone communication with ETS personnel December 30, 1988, the suggested slant boring ad)acent to the waste oil tank will require additional details. A minimum of two soil samples is required for each angle boring performed per tank. A cross-sectional diagram illustrating the angle of the slant boring and the placement of the two soil sampling points will be necessary prior to the issuance of ' the drilling permit. In order to obtain maximum sampling points at both ends of tanks, we recommend the slant boring be performed parallel to the tank, and the first soil sample be collected at the tank bottom interface with native soil and the second sample be collected at the j termination of the boring which is aligned with the opposite end of the tank. If this recommendation cannot be achieved at this site, then illustrate the best possible angle and sampling points. ' 3: Review of our files indicates the waste oil tank has not previously been registered nor have the appropriate tank fees been applied to this tank. Enclosed is a Fee Worksheet and a Closure Plan informational packet. Please complete the Closure Plan information and submit all the required fees at the time of submittal for the permanent closure of the waste oil tank. These issues should be addressed in a revised sampling plan which must be submitted to this office for approval prior to initiating the work plan. It should be noted that additional sampling may be necessary should the results of the sampling effort not adequately define the extent of ' Administration Clinical Services Environmental Health PubliC Health Nursing 468-3400 468-3830 468-3420 468-3860 ' Air Pollution Community Services Laboratory WIC 468-3470 468-3820 466-3460 468-3280 AIDS Inlormation 468-3820