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Project No. S8100-06-30 <br /> July 25, 1995 <br /> Page 2 - <br /> under the tanks "had a strong hydrocarbon odor." The approximate former locations of the USTs, <br /> product piping and associated fuel dispensers are depicted on the Site Plan, Figure 2. <br /> Soil samples were obtained beneath theproduci.piping'at the elbow, and beneath each dispenser. <br /> at depths of approximately 4 to 4-.5.feet.below ground surface (bgs). The piping samples were <br /> analyzed for total petroleum.1 ydrocarbons as gasoline (TPHg), diesel (TPHd) and motor oil . <br /> (TPHmo) and benzene,. ,toluene; ethyibenzene.;and .total xylenes (BTEX). The results of <br /> laboratory,tests indicated,nondetected-concentrations of the target compounds.with the exception - <br /> of 92 reg/kg TPHd (characterized as kerosene) beneath the diesel dispenser at a depth of 4 feet <br /> bgs. <br /> Groundwater was not encountered within-the.UST and piping excavations. The excavations were <br /> subsequently backfilled and'repaved with asphalt concrete. <br /> PURPOSE AND RATIONAI:E <br /> The purpose of the work outlined in Task Order. No. 10-5FI000-12 is to provide.additional <br /> information -regarding potential soil and groundwater petroleum hydrocarbon .impacts in the <br /> vicinity of the former USTs. The proposed soil boring locations haves been chosen by'Caltrans <br /> to define the lateral and vertical extent of petroleum hydrocarbon impacted soil if encountered. <br /> A provision for the installation of groundwater monitoring.well(s),has been included herein if <br /> groundwater conditions are encountered within the borings: <br /> SCOPE OF SERVICES' <br /> The following scope of services'have been prepared to achieve the objectives stated herein. <br /> Pre-Field'Activities <br /> A Prework Site Visit was conducted on July 13, 1995 with the Caltrans contract:managers, Mr. <br /> Saiyed Ali and Mr. Japtej GJ to inspect the work area. The Prework Site Visit'°Checklist and <br /> Completion.Schedule was subsequently discussed and signed by�Mr. John Juhrend, the Geocon <br /> project manager, and by Mr."Gill:: -:The proposed boring locations were marked during the <br /> Prework Site Visit. In addition to the Prework Site Visit the following items will be completed <br /> prior to commencing field work: <br /> • A soil boring/well permit will-be obtained from the San Joaquin County_Public Health <br /> Services. <br /> • Notify the subscribing public utility agencies via Underground Service Alert a minimum <br /> Of 48 hours prior to commencing:the subsurface investigation to determine the location of <br /> N - <br />