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k" KLEINFELDER <br /> } <br /> i :EXECUTIVE SUMMARY <br /> L A <br /> This is a 1-eport of Kleinfelder's Limited Prelinninary Site Assessment conducted at the Delta Sign <br /> L Facility located at 2.100 San+ouinetti Lane in Stockton. California. Ms. Penny Patti retained <br /> Kleinfelder to conduct the assessment. The assessment was conducted based upon Kleinfelder's <br /> Lproposal titled "Revised Proposal/Worl<plan. Limited Preliminary Site Assessment, Delta Sign <br /> and Crane Service, 2100 Sanguinetti Lane. Stockton', California," dated :lune 16, 1998. <br /> Tour soil borings were advanced at the Dclta,Sign facility in the vicinity of a former underground <br /> storage tank (UST). The fanner UST reportedly was located near the southeast corner of the <br /> main building at the subject site. One soil boring was advanced in the estimated center of the <br /> former UST and three soil borings were advanced.alon�c, the perimeter of the former UST in a <br /> northerly to southeasterly direction. During advancement of the soil borings, no unusual odor or <br /> discoloration was noted. Soil samples were collected every five feet from ground surface. Two <br /> LI <br /> soil samples from the bottom of each boring and two additional samples collected from fifteen <br /> foot intervals above the bottom of the boring were submitted for analyses under chain-of-custody <br /> procedures to Sequoia Analytical Laboratory of Sacramento, California. In Borings 1 and 2, <br /> L elevated of-anic vapor readings warranted additional samples to be submitted for analyses. <br /> A total of sixteen soil samples were submitted for analyses from borings Bl through B4, <br /> L collected at depths ranging from 15 to 5D-'/? feet below ground surface (bsg). The soil samples <br /> were analyzed for the following": <br /> } <br /> • Total Petroleum Hydrocarbons as referenced to :Diesel [TPI -D] by EPA .Method 8015M <br /> • Total Petroleum Hydrocarbons as referenced to Gasoline [TPH-G] by EPA Method 8015M <br /> L • Benzene, Toluene, Ethylbenzene, and Xylenes [13TEX] by EPA Method 8020/5030 <br /> • Oxygenates including Methyl 'l'ert-Butyl Ether [MTBE] by EPA Method 8260 <br /> LNone of the requested analytes were detected at or above the laboratory reporting limits in the <br /> sixteen soil samples analyzed. <br /> LBased on the results of this assessment. Kleinfelder does not recommend further soil assessment <br /> in the vicinity of the former tuiderground storage tank (UST). Additionally, Kleinfelder <br /> recommends regulatory file closure be oranted by the appropriate agencies with regards to this <br /> L former UST location. A copy of this report should be submitted to the San Joaquin County <br /> Public Health Services Department, Environmental Health Division (PHS/EI-ID) and the State of <br /> LCalifornia. Central Valley Regional Water Quality Control Board (CVRWQCB) for their review <br /> and comment. Finally, Kleinfelder recommends that the drilling derived wastes be dumped on <br /> the surface of the former UST location following PHS/EHD approval to do so. <br /> 20-2864-02.L0312019R 0_;2 rage I of 12 <br /> 0 1998_ Kleinfckler_ lnc. January 14, 1999 <br />