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f4 enhanced, and thus, could cause the extent of degredation seen in less than 3 years CONCLUSIONS • Concentrations of hydrocarbons in the influent vapor stream continue to climb, as does the volume of gasoline recovered from the subsurface • A measurable thickness of free-floating hydrocarbons has been discovered within monitoring well MW-6 and piezometer P-4 These wells are positioned near the UST farm at the site These two wells have contained free-product previously, initially discovered in June 2001 Several months of product bailing last summer removed the product from these wells Product was re-discovered again earlier this month • Based on the information reviewed by F&B, it appears that the product identified in monitoring well MW-6 and piezometer P-4 may be the result of a new release RECOMMENDATIONS ASE recommends the following modifications to the operation of the ASNE system for the last quarter of 2002 • Continue operation of the ASNE remediation system through the next quarter in a pulse-on, pulse-off manner After each 4 weeks of continued operation, the system will be shut off for 2 weeks This will allow for (a) the healing of preferential pathways likely generated from the rigorous air- sparging and vapor-extracting operations, (b) free-product to accumulate for bailer recovery, (c) ASE to determine if the free-product accumulates and/or reduces at different rates during on or off periods of remedial activities • In an effort to concentrate the remedial efforts near the free-product, ASE will shut-off one additional pair of remediation wells which will increase the vacuum influence and injection rate in the remaining remediation wells • Measure and bail free-product on a weekly basis a • Send a sample of the 2002 product to Zymax for a detailed gasoline range hydrocarbon analysis to compare with the 2001 product sample Frank's One Stop Remediation System Monthly Report — August & September 2002 -5-