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-3- `.'' <br /> ARCO GAS STATION 18 MAY 1987 <br /> all monitoring data collected to date. While acquiring the permits <br /> from the city and county may require some time, the previously <br /> mentioned items may be started at once. <br /> Vorster requested that Brown and Caldwell evaluate the integrity of <br /> the PVC well casing in the existing monitoring wells at the site. <br /> These have been exposed to undiluted petroleum products and high <br /> levels of petroleum products in ground water for about three years. <br /> The effects of such exposure on PVC are not well understood. <br /> The intersection of Benjamin Holt and Plymouth Drives has been the <br /> site of substantial excavation and backfill. Cotulla indicated that <br /> the porous backfill used for the pipelines and other utilities in <br /> the intersection has changed the probable route of contaminants in <br /> the subsurface. This should be kept in mind as the investigation <br /> proceeds. All utilities and pipelines should be located. <br /> Cotulla indicated that a permit for newly installed underground <br /> tanks at the site has not yet been isssued. Also, attorneys for the <br /> landownder leasing the station site to Arco have copied the health <br /> district's files concerning the site. Litigation involving this <br /> spill may be pending. <br /> It was agreed that the results of Brown and Caldwell 's work and a <br /> proposed workplan would be submitted in a report to the Board and <br /> the County by 1 June 1987. <br /> In summary this report would include: <br /> 1. The result of the soil vapor survey. <br /> 2. Results of on-site soil borings to determine extent of <br /> soil contamination. <br /> 3. Results of water sample analyses from samples Brown and <br /> Caldwell will take from existing monitoring wells, and <br /> nearby water supply wells. <br /> 4. Presentation and interpretation of data gathered by <br /> Emcon or others since the March 1986 report. <br /> 5. Proposed soil boring locations for further definition of <br /> contaminated soils. <br /> 6. Status of permit and evaluation of discharge of <br /> contaminated groundwater to sewer. Pretreatment must be <br /> considered. <br /> 7. Maps of study area including: <br /> a. nearby streets and property <br /> b. layout of all tanks and piping <br /> C. local topography <br /> d. location of nearby underground utilities <br /> e. existing monitoring wells <br /> f. nearby water wells <br /> S. Proposal to inventory local ground water use. <br />