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C I ' CHAPTER I ' II INTRODUCTION The Sheldon Oil Company (Sheldon) has conducted site assessment, remediation and closure activities at their property located at 2210 Miner Street in Stockton, California. The J property is being leased by Kent's Oil, which operates an asphalt blending plant. A 265,000 gallon capacity steel underground storage tank (UST) which had been used to store asphalt oils was removed by O.H. Materials Company from the Kent's Oil facility (Site) in 1990. During the tank removal, it became apparent that soil in the vicinity of the UST contained petroleum hydrocarbons., Therefore, approximately 1,700 cubic yards of soil was also removed from the UST area andwas stockpiled on Site. However, additional hydrocarbon-affected soil was left in place. In` 1993, additional work was performed by Aprotek on the Site including soil excavation and sampling, excavation backfilling, and site closure. This report describes the 1993 work. Asphalt-oils consist of carbon chains that range from approximately C2o to C Diesel— fuel,-which-ranges from C13 through C26, and motor oil, which ranges C22 to C32 hydrocarbons, both overlap.the C2o to C,, range of hydrocarbons found-`in asphalt oil; however, at this site only asphalt oil was stored in the UST. Therefore it is concluded that hydrocarbons identified in the vicinity of the UST originated from the UST. Standard laboratory methods have been established LI/ for analyzing soils for total Y g petroleum hydrocarbons as diesel (TPHd) and total petroleum hydrocarbons as motor oil(TPHmo). However, there are no standard methods for total petroleum hydrocarbons as asphalt. Since the asphalt range oils overlap the diesel and motor oil range, soil samples were analyzed for TPHd and TPHmo and identified concentrations of TPHd and TPHmo in the soil are considered to indicate the presence of asphalt oil. As required by the County, soil samples were also analyzed for gasoline, benzene, ethylbenzene, toluene, and xylene compounds. } The 1990 UST removal was conducted by Q.H. Materials Company (OHM). In January 1993, Brown and Caldwell (BC) was authorized by Sheldon to provide consulting services at the t Kent's Oil facility. Services provided by BC have included work plan preparation, soil sampling and analysis to identify petroleum hydrocarbon affected soil, and assistance in the closure of the hydrocarbon affected area of the facility. Aprotek, operating within G.R. Kause Construction and Engineering (Kause), provided environmental contracting services. Documents prepared by Aprotek were issued on Kause letterhead. J.H. Kleinfelder & Associates (Kleinfelder) provided i geotechnical services during excavation and backfilling. Sheldon directly contacted Western Environmental :Science and Technology (WEST), a State of California certified analytical Llaboratory, to provide analytical services. Both the 1990 work and the 1993 work were directly overseen by the San Joaquin County Public Health Services Department (County). { 1 Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this document. I2/22i9 \7603\RFAORTSKFNr-0n a.o L QMSYS2200 I I