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r <br /> �rt . <br /> SOIL REMEDIATION PROPOSAL <br /> TANK T-2 AND T-1 AREAS <br /> 100 W. Valpico Road <br /> Laura 5cudders Tracy Plant <br /> Tracy, California <br /> 1.0 Introduction <br /> This soil remediation proposal has been prepared to summarize the <br /> findings of the site investigation work for two underground fuel <br /> rte= storage tank areas within the Laura 5cudders Plant located at 100 <br /> W. Valpico Road in Tracy, California (Figure 1) , and to provide a <br /> discussion of the proposiTd remedial action for the site. All site <br /> investigation activities were conducted in accordance with the <br /> January 19, 1990 "Soil Investigation Work Plan" prepared by ROY F. <br /> WESTON, INC. All site investigation activities were reviewed by <br /> representatives of the San Joaquin County Department of Health <br /> Services, Environmental Health Division. <br /> 2.0 Site Investigation Activities <br /> The following discussion provide a summary narrative as to the site <br /> investigation activities conducted at the facility. The specifics <br /> of the field sampling activities are contained in the field <br /> sampling report enclosed as Appendix A. <br /> 2.1 Tank T-2 Area <br /> Tank T-2 was a 10,000 gallon diesel fuel storage tank that was <br /> removed in 1987. Initial tank-bottom area soil samples indicated <br /> { significant Total Petroleum Hydrocarbon (TPH) concentration. <br /> Ensuing excavations were thought to have removed all of the TPH <br /> presence. However, upon the request of the Local Health Depart- <br /> ment, an additional investigation was conducted. <br /> Tris additional investigation consisted of installing a single <br /> borehole utilizing a hollow stem auger drilling rig, directly <br /> through the center of the former tank area (Figure 2) . This <br /> borehole was continued until groundwater was encountered. In order <br /> to ascertain the passible compound presence within the soils <br /> underlying the tank area, soil samples were collected at 51 <br /> intervals during the borehole installation starting at a depth of <br /> 20' beneath the ground surface. Upon reaching the groundwater, a <br /> groundwater sample was collected from within the annulus of the <br /> hollow stem auger. All of these samples were analy, ' 1 for total <br /> petroleum hydrocarbons as diesel and benzene, toluene, xylene and <br /> ethyl benzene (BTX&E) . The analytical results for these saL;ples <br /> are discussed in Section 3. <br /> 2.2 Tank T-1 Area <br /> Tank T-1, a 1,000 gallon gasoline tank, was removed in May 1989. <br /> Initial tank bottom area soil samples indicated the presence of <br />