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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 /> piping system following their removal . Due to the anticipated depth of <br /> excavation, sampling personnel will not enter the excavation. Instead, <br /> samples will be collected from the excavation bottom and sidewalls using <br /> the contractor's backhoe bucket at locations to be indicated by Kennedy/ <br /> Jenks/Chilton personnel . Samples will be taken from the contractor's <br /> backhoe using a clean trowel . Soil will be placed in brass liners and <br /> covered on both ends with Teflon sheets which will be secured in place <br /> with plastic end caps and duct tape. Each brass liner will be labeled to <br /> identify sampling location, date of collection, time, initials of <br /> collector, and any other pertinent information. The brass liners will <br /> then be placed in a cooled ice chest and sent to the Kennedy/Jenks/ <br /> Chilton Laboratory Division in San Francisco or another state certified <br /> laboratory for analysis. A chain-of-custody form will be filled out <br /> concurrently with sample collection and included with the samples during <br /> shipment. <br /> Soils removed from the excavation by the contractor will be monitored for <br /> the presence of organic vapors. This monitoring will be performed by <br /> placing samples of soil from the backhoe bucket into self-sealing plastic <br /> containers and allowing the containers to sit in a warm area for 5 to 10 <br /> minutes. Organic vapor concentrations present in the sample container <br /> headspace will be measured by inserting the probe of an organic vapor <br /> analyzer into the plastic container. <br /> If there are visible indications that the tank has leaked (stained soil , <br /> visible tank product, or holes noted in the tank) , we will utilize the <br /> headspace monitoring technique to identify soils to be removed by the <br /> Contractor. If leakage has occurred, it is anticipated that soil samples <br /> from various depths will be collected for both headspace analysis and <br /> laboratory analysis to evaluate attenuation rates of tank product. If <br /> the leakage appears limited in extent and depth, we will identify soils <br /> that should be removed or sampled. If significant leakage has occurred, <br /> we will provide recommendations for interim measures such as temporary <br /> backfilling of the excavation. <br /> Analysis of four soil samples for TPH and purgeable aromatics utilizing <br /> gas chromatography with a flame-ionization detector (GC/FID) will be <br /> performed. The anticipated sample locations are as follows: two samples <br /> from the bottom of the excavation and two samples from beneath the <br /> piping. To expedite excavation and backfilling, a 48-hour laboratory <br /> analysis turn-around time is budgeted for these analyses. <br /> If the tank has leaked a significant amount of product, additional soil <br /> WPNMLI :STOCKTON.WP2 A - 3 <br />