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� <br /> PUBLIC HEALTH SERflCES ,oP .ro <br /> SAN JOAQLIN COUNTY � z <br /> foal KHANNA 1AD..AP.14. <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) a Stockton, Califomia 95201 F oR <br /> (209)468-3400 <br /> STEPHEN POA <br /> MOBIL OIL CORPORATION <br /> 3800 WEST ALAMEDA AVE (c(aFly <br /> SUITE 2000 FEB 10 1992 <br /> BURBANK CA 91505-4331 <br /> Re: Former Mobil Bulk Plant REFER TO SITE CODE: 1968 <br /> 500 East Grant Line Road <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has completed review of the Alton Geoscience <br /> Workplan dated December 20, 1991 with PHS/EHD comments to follow. <br /> PHS/EHD agrees that additional soil/groundwater investigation is <br /> necessary to define the extent of contamination. Alton's <br /> workplan suggests four soil borings and one continuous soil <br /> boring, to be converted into a six inch recovery well, as the <br /> next phase of the investigation. <br /> Soil boring B-7 did not undergo analysis for soil contamination, <br /> however, the qualitative shallow groundwater survey did indicate <br /> groundwater contamination. There has been a lack of soil <br /> characterization therefore, PHS/EHD recommends that soil samples <br /> be taken every 2 to 2 1/2 feet during proposed borings. <br /> It is PHS/EHD understanding that direct discharge of treated <br /> groundwater to the City of Tracy sanitary sewer is not allowed. <br /> A NPDES permit, granted by the Central Valley Regional Water <br /> Quality Control Board, is required for discharge of treated <br /> groundwater to the City of Tracy storm drain. Negotiations with <br /> the City of Tracy, Waste Water Treatment, Environmental Controls <br /> Department, for batch disposal of treated groundwater should be <br /> continued. <br /> Pursuant to Section 2652 (d) of the Underground Storage Tank <br /> Regulations (California Code of Regulations, Title 23 , Subchapter <br /> 16) a quarterly monitoring report shall be submitted to Public <br /> Health Services, Environmental Health Division and Central Valley <br /> Regional Water Quality Control Board (CVRWQCB) until the <br /> investigation and cleanup of the site is deemed adequate. The <br /> report is to show the: <br /> A Division of San Joaquin County Health(are krviccs 10 <br />