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1 <br /> 1 September 1995 data, and copies of laboratory reports are contained in Appendix D The <br /> analytical results for the modeling parameters are contained in Appendix C Soil cuttings from <br /> dnllzng the confirmation borings were spread out on the site <br /> ' The TPHg, BTEX and TPHd previously detected in the soil beneath the site have, in general, <br /> been remediated to non-detectable levels <br /> 442 Groundwater Conditions <br /> ' Subjective observations, field purge logs, and laboratory data sheets for the most recent <br /> sampling event (September 28, 1995) are included in Appendix D The September 28, 1995 <br /> ' average groundwater gradient of 0 001 feet per feet to the east-northeast is depicted on Figure <br /> 6 <br /> Results of this quarter's laboratory analyses of water samples from wells MW-1, MW-2, MW- <br /> 3, MW-4, MW-5 and MW-6 indicate that the concentrations of BTEX, TPHg, TPHd, and lead <br /> were nondetectable in all wells Purgewater from the monitoring event was discharged to the <br /> ground surface <br /> ' Based on the results of this quarterly monitoring and previous work performed at the site <br /> Smith Environmental concludes that the TPHg, TPHd, and BTEX concentrations in <br /> groundwater have remained nondetectable, consistent with the last three monitoring episodes <br /> In addition, it appears that lead concentrations in groundwater have decreased to nondetectable <br /> ' levels <br /> ' Since monitoring was reinitiated in December 1992 the concentrations of TPHd, TPHg, and <br /> BTEX have steadily decreased to nondetectable levels and no longer appear to be impacted by <br /> 1 petroleum hydrocarbons in soil beneath the site This is a result of the continued operation of <br /> the soil vapor extraction system which began operating in July I993 <br /> 1 <br /> n 10540061reports1CLO1195 doe 1 1 <br /> • <br /> 1 <br /> SMTH <br />