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«i Mr. Kelly Williamson August 1, 1985 Page Two A review of the drilling logs of all bora gs that have been made from February 1985 to present have detailed the shape and size of the plume as it exists within the confines of the station property, but the extent to which the plume has extended to the southeast beyond the property line is an unknown. A plot of the station, shows g the monitor well locations, is attached and included on the drawing is the area encompassed by the plume within the station .bounds, based on all iriformation available. The dotted line beyond the property lines is only an estimate based on product volumes i found in MW#10 and MW#13. While reviewing the past drill logs it was noted that the groundwater level has decreased from 29 feet on February 28, 1985, to 43 feet on July 26, 1985, and groundwater direction has changed frequently. I Since this station is located in a highly agricultural area where large I quantities of groundwater are used for irrigation, it is most probable that this trend of groundwater depletion will continue until the fall of the year. With respect to the groundwater level decreasing, it would be a reasonable t conclusion that the product is moving down deeper into the soil, thus slowing the lateral expansion of the plume. To address the phased product that is presently on the groundwater surface, j it would be my recommendation that a recovery well be installed as soon as possible and a groundwater depression pump used in conjunction with a hydro- carbon recovery system to stablize the ever changing groundwater direction at this location and begin recovery of t e lost product. Once all the free product has been recovered, several alternatives can be studied with regard to the reclamation of the effected soils and groundwater, such as bioreclamation, air stripping and reinjection, carbon filtration or a combination thereof. I Inasmuch as the groundwater is dropping at such a rapid rate, I would like to recommend that the clean water discharge from the recovery system be placed in the perculation pond that is in place at this location, due to the fact that the perculation pond is located ovei a good area of the plume and the ;i water would help to precipitate the product in the soil in that area down to groundwater, enhancing the recovery effo t, and the groundwater would not be further depleted. Attached you will find a chart of the monitor well data for July 26, 1985, which outlines the conditions found on that day. Supplemental reports for this location will follow as new data is collected. Ver truly, J. R. Fox Project Manager JRF/ca Attachments