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Kennedy/Jenks/Chilton <br /> Attachment A to Kennedy/Jenks/Chilton's <br /> letter to Mr. Ron Valinoti <br /> dated 13 October 1989 <br /> samples will be collected as needed to evaluate variations of product <br /> concentrations in soils with respect to depth. This information will be <br /> useful in determining the need for and extent of soil cleanup. Prior to <br /> analyzing these additional samples, we will seek authorization from Cal- <br /> Farm to perform the required analyses. <br /> Detailed field notes will be maintained by Kennedy/Jenks/Chilton during <br /> the tank removal process. These notes will include the following <br /> information: visual indications of staining, the results of headspace <br /> monitoring, and approximate locations and depths of excavated soil <br /> containing tank product. <br /> Soils excavated during tank removal will be placed on the existing <br /> compacted surface soils inside the fenced area of the yard. Soils will <br /> be spread out for aeration of hydrocarbon constituent. It is estimated <br /> that aeration will take 4 to 8 weeks after which the soils will be placed <br /> back into the tank excavation area. Confirmation soil samples will be <br /> collected and analyzed prior to backfilling. At the time of backfilling, <br /> additional soil may be required to replace the volume previously occupied <br /> by the tank. Therefore, clean imported fill will also be used to fill <br /> the tank excavation. <br /> Task 3 - Additional Groundwater and Soil Monitoring <br /> One additional soil boring will be drilled to assess the extent of TPH <br /> and BXTE in subsurface soils downgradient of the underground fuel storage <br /> tank. After the boring is drilled and sampled it will be converted into <br /> a groundwater monitoring well to evaluate the groundwater quality with <br /> regards to TPH and BXTE. The proposed location of the soil boring/ <br /> monitoring well is shown on Figure WP-1 . <br /> The boring will be drilled to approximately 25 feet using a truck-mounted <br /> drilling rig and utilizing 8-inch (nominal outside diameter) hollow-stem <br /> augers as the drilling method. Soil samples will be collected <br /> continuously for lithologic purposes using a continuous soil sampler. <br /> Samples for laboratory analyses will be collected at 5-foot intervals <br /> using a split-spoon drive sampler with brass liners inserted inside for <br /> sample retention. One brass liner from each drive interval will be <br /> sealed at both ends with a Teflon sheet and a tight fitting plastic cap. <br /> Duct tape will be wrapped around both ends of the liner and caps to <br /> prevent cap slippage during transport. Each liner will be labelled as to <br /> date, boring number, sample number, depth, time, initials of collector, <br /> and any other pertinent information. Capped liners will be placed in a <br /> chilled cooler along with completed chain-of-custody forms and shipped to <br /> WPNMLI:STOCKTON.WP2 A - 4 <br />