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09/28/99 TUE 21:04 FAX 209 948 0521 KLEIMILLULK 1NU %LJUVO <br /> T le Granite Construction facility incorporates the use of liquid asphalt cutback and emulsion which <br /> h is been stored onsite in two 12,000 gallon underground storage tanks discussed in the text of this <br /> rc port. Kleinfelder understands that currently liquid asphalt emulsion is no longer stored at the site. <br /> T le cutback and emulsion liquids consist of a mixture of petroleum hydrocarbons and distillates. <br /> S')ecifically,the cutback liquid is called"SC Cutback Asphalt; SC-250"and the emulsion is called <br /> ".,Uphalt Emulsion; SS-1H". Both products are manufactured by Huntway Refining Company of <br /> Wilmington,California. <br /> h: accordance with the requests from the San Joaquin County Public Health Services Department, <br /> Environmental Health Division(PHS/EHD)to the Granite Construction Co.,Kleinfelder conducted <br /> a soil assessment beneath the SC-250 tank for the presence of petroleum hydrocarbon constituents <br /> it 1989. At that time Kleinfelder advanced two(2)angled borings at 45 degrees from the surface to <br /> o stain soil samples beneath the tank. Based on the analytical data results it was Kleinfelder's <br /> r(commendation that no additional assessment was warranted at that time. Kleinfelder is not aware <br /> o'any sampling that had ever occurred beneath the SS-1H tank. <br /> B ased on the desire to abandon these two tanks in-place, Granite Construction's requested a <br /> p oposal from Kleinfelder to address potential environmental concerns associated with the two <br /> t-r nks. 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 /> 1ti ewark, California. Kleinfelder submitted a "Revised Proposal, Pre-Abandonment underground <br /> sl orage tank soil assessment ....",dated November 4, 1998. The proposal was approved by Granite <br /> a:id PHS/EHD, and on December 8, 1998, four angle soil borings were advanced beneath the <br /> v cinity of two existing 12,000 gallon USTs at the subject site. A total of 20 soil samples and 2 <br /> g-oundwater samples were collected for potential chemical analysis. Grab groundwater was <br /> e:lcountered approximately 14 feet bgs. No hydrocarbon-like odors or discoloration were <br /> p'esent in the soil or groundwater samples collected during advancement of the 4 soil borings. <br /> P D readings recorded from the soil samples collected ranged from 11 to 20 ppmv. The readings <br /> a-e likely associated with soil moisture. <br /> Flight (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 /> 21-1108-42.FA1/2019L853 Page 2 of <br /> Copyright 1999,Kleinfelder,Inc. September 27,1999 <br /> KLEIN=ELDER 2825 East Myrtle Street,Stockton,CA 95205-4794 (209)948-1345 (209)948-0621 fax <br />