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i <br /> i <br /> After cleaning drilling tools, a core was taken from 22' to 24'. It consisted of tan to <br /> brown clay, sticky & slightly damp. No free water was present, and there were no <br /> odors or discoloration in any of the core. The abrupt change from the previous <br /> core indicates the presence of an aquiclude somewhere between 18 feet and 22 <br /> feet. <br /> 'A hydropunch tool was run in the hole, but stopped at 16 feet due to apparent <br /> bridging. After opening the hydropunch tool, there was rapid water entry. Small <br /> diameter tubing was run into the pipe and 4 VOA's were filled with slightly muddy <br /> water. There were no odor or sheen noted in any of the VOA's. The water <br /> samples were labeled and preserved for shipment to the laboratory. Refer to <br /> PLATE V for more details of the lithology and other pertinent data. Copies of the <br /> laboratory sheets and custody chains are included as EXHIBIT B. <br /> The soil &water samples were transferred under chain of custody to the courier <br /> from Sherwood labs, Inc. with instructions to analyze for BTEX, TPHg, & MTBE. <br /> i <br /> The three probe holes were thoroughly grouted with cement & the probe unit <br /> released. <br /> • DISCUSSION OF RESULTS OF LATEST WORK: <br /> TABLE VII summarizes the laboratory results of the soil samples taken from the <br /> three probe holes. All samples from GP-1 & GP-2 were below detection limits. <br /> GP-3 revealed BTEX & TPHg in soil samples at 11 feet & 17 feet; the one taken <br /> at 23 feet was ND. This supports the evidence that an aquitard exists between <br /> 18' and 22' below grade. Based upon this data, it appears that the soil plume <br /> extends beneath and beyond the southeast corner of the building as shown on <br /> PLATE II. <br /> TABLE VIII summarizes the laboratory results of the water samples collected <br /> during the work. The samples from GP-1 were below detection limits, but both <br /> GP-2 & GP-3 recorded minor amounts of BTEX. GP-2 also measured TPHg at <br /> 437 ug/L, and GP-3 indicated 37 ug/L of MTBE (not confirmed.) However, some <br /> voa's from GP-2 & 3 contained air bubbles when examined in the laboratory. <br /> The lab notes did not indicate whether all voa's contained bubbles, or only certain <br /> ones. Since the water samples did reveal meaurable levels of BTEX & TPHg, the <br /> air bubbles do not condemn the results, only the concentrations. <br /> i <br /> SUMMARY: <br /> iSince the start of this project, the following events have taken place: <br /> 5 <br />