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1 h'q KLEINFELDER <br /> The Granite Construction facility incorporates the use of liquid asphalt cutback and emulsion which <br /> has been stored onsite in two 12,000 gallon underground storage tanks discussed in the text of this <br /> report. Kleinfelder understands that currently liquid asphalt emulsion is no longer stored at the site. <br /> The cutback and emulsion liquids consist of a mixture of petroleum hydrocarbons and distillates. <br /> Specifically, the cutback liquid is called "SC Cutback Asphalt; SC-250" and the emulsion is called <br /> "Asphalt Emulsion; SS-IH." Both products are manufactured by Huntway Refining Company of <br /> Wilmington, California. <br /> In accordance with the requests from the San Joaquin County Public Health Services Department, <br /> Environmental Health Division (PHS/EHD)to the Granite Construction Co., Meinfelder conducted <br /> a soil assessment beneath the SC-250 tank for the presence of petroleum hydrocarbon constituents <br /> in 1989. At that time Kleinfelder advanced two (2) angled borings at 45 degrees from the surface to <br /> obtain soil samples beneath the tank. Based on the analytical data results it was Kleinfelder's <br /> recommendation that no additional assessment was warranted at that time. Kleinfelder is not aware <br /> of any sampling that had ever occurred beneath the SS-1H tank. <br /> Based on the desire to abandon these two tanks in-place, Granite Construction's requested a <br /> proposal from Kleinfelder to address potential environmental concerns associated with the two <br /> tanks. In preparation for Kleinfelder's field work, the tanks had been cleaned and vacuumed out by <br /> M.P. Environmental Services with all product recovery transported under manifest to Evergreen in <br /> Newark, California. Kleinfelder submitted a "Revised Proposal, Pre-Abandonment underground <br /> storage tank soil assessment ....,"dated November 4, 1998. The proposal was approved by Granite <br /> and PHS/EHD, and on December 8, 1998, four angle soil borings were advanced beneath the <br /> vicinity of two existing 12,000 gallon USTs at the subject site. A total of 20 soil samples and 2 <br /> groundwater samples were collected for potential chemical analysis. Grab groundwater was <br /> encountered approximately 14 feet bgs. No hydrocarbon-like odors or discoloration were <br /> present in the soil or groundwater samples collected during advancement of the 4 soil borings. <br /> PID readings recorded from the soil samples collected ranged from 11 to 20 ppmv. The readings <br /> are likely associated with soil moisture. <br /> Eight (8) of the 20 soil samples and two groundwater samples collected were analyzed for the <br /> following: <br /> • Benzene, Toluene Ethylbenzene,Total Xylenes [BTEX] by EPA Method 8020 <br /> • Fuel Fingerprint by EPA Method 8015M <br /> • Custom Fuel Fingerprint; identified and quantified against client supplied standards of SS- <br /> 250 and SS-1H by EPA Method 8015M <br /> 20-1108-24.E01 /2019R930 Page 2 of 5 <br /> Copyright 1999,Kleinfelder,Inc. October 19, 1999 <br />