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Project No. 9688 '` WORK PLAN ``w/ June 11, 1999 <br /> 2373 Mariposa Road Page-3 <br /> In 1991 in order to comply with regulations, three samples were taken from <br /> the tank removal excavation and one from soil stockpiled on site. On October <br /> 15, 1991, the sampling was carried out under the observation of EHD. The <br /> following table presents the specifics of the October 15, 1991 sampling episode. <br /> All results are in parts per million (PPM).The locations of the three <br /> excavation samples are shown on the attached Figure 2. The reason for the <br /> analyses selected was not discerned. <br /> Sample Location Depth TPH-D TPH-G TPH-MO BTEX LEAD VOC <br /> ID <br /> HC-1N north bottom 14 2,500 100 110 ND/ND/ND/ND 180 ND <br /> of pit <br /> HC-2S south bottom 14 2,500 150 <50 ND/ND/ND/ND 9.9 ND <br /> of pit <br /> HC-3E east 6 230 -- <10 -- -- -- <br /> sidewall of <br /> it <br /> HC-1P stock ile I <1000 10 33,000 ND/0.013/ND/0.21 <br /> Composite stockpile 1170 ND <10 ND/ND/ND/ND <br /> NOTES: TPH-D total petroleum hydrocarbons as diesel <br /> TPH-G total petroleum hydrocarbons as gasoline <br /> TPH-MO total petroleum hydrocarbons as motor oil <br /> BTEX benzene/toluene/ethylbenzene/total xylenes <br /> ND Not detected at method limits <br /> -- Not analyzed (reason unknown) <br /> Based on the results of the above sample analyses, EHD required further <br /> work. The next significant work carried out was by Wm. J. Hunter & <br /> Associates during October 1994. The work included drilling- and sampling 6 <br /> borings to depths ranging from 35 feet to 50.5 feet. The location of the six <br /> borings are shown on the attached Figure 2. The borings were all sampled at 5 <br /> foot intervals. All samples were analyzed for TPH-G and BTEX. However <br /> only the samples from boring F ( the easternmost boring) were analyzed for <br /> TPH-D. Only one sample from boring F was analyzed for lead. A note on the <br /> chain of custody indicated only the sample with the highest TPH-D reading <br /> was to be analyzed for lead. The reason for the other analyses selected was not <br /> discerned. <br /> The following table presents the specifics of the October, 1994 sampling and <br /> drill program. All results are in PPM. <br /> WILLIAM DUBOVSKY ENVIRONMENTAL <br />