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Geofogica[Tecfuucs Inc. Page 8 Hunter Container - Report-Soil and Groundwater Investigation Project No.397.2 October 25, 1996 The spatial relationship of the upper boundary of the petroleum hydrocarbons beginning deeper in MW-1 (34 feet from the pipeline) than in SB-2 (16 feet from the pipeline) supports the theory that the petroleum hydrocarbons were sourced from the pipeline and not from Hunter Container. The cross section attached in Figure 3 shows the spatial relationship of these factors. Septic Tank Water A sample of the water from the second chamber septic tank was collected and tested for purgeable and extractable petroleum hydrocarbons, halogenated solvents, and CAM 17 metals. The septic tank sample results show low concentrations of purgeable and extractable petroleum hydrocarbons, trace amounts of three metals (chromium, copper, and zinc), and no volatile organic compounds (i.e., halogenated solvents). However, because matrix effects and/or other factors required additional sample dilution, the reporting limits for the halogenated solvent sample have been raised. �a The source of the petroleum hydrocarbons found in the septic tank is not clearly understood. So, on October 21, 1996, Ray Kablanow of GTI met with George Ymashita, Ray Morris, and Doug Frans of US Can to discuss the operation of the facility and to evaluate possible sources for these chemicals. A list of the current and past chemicals used at this facility is included in Appendix C, along with MSDS for currently used chemicals solutions or materials. I An audit evaluation inspection of the new US Can facility shows that they run a very clean i operation and take precaution to ensure adequate compliance with environmental regulations. There are no floor drains; however, there are two sewer line clean-out access ports in the floor, both with lids. There are no sinks in the factory work area, only in the restroom and breakroom. J Three possible sources of these chemicals were identified: 1) Construction workers may have disposed of these chemicals during final phases of the facility construction. In the event the construction workers disposed of petroleum waste in the septic system,then it was a one time event and is not re-occurring. _ 2) Mop water disposed of in the sewer from a complete factory floor mopping event that occurred about two weeks ago. The mop water probably carried solvents, thinners, oil, standard sweep (anadsorbent) and minute particulate metal fragments from around the cutting machines and from the machine shop. In the event the mop water was the source, that also was a one time event because US Can has decided to containerize the mop water and not dispose of it in the sewer. 1 3) Hand washing with cleaners by factory workers. This is not believed to be a significant volume input and probably only accounts for 100 to 200 gallons per day. US Can estimate that 500 to 1,000 gallons of gray water and sewer water are discharged to the septic tank each day of operation and is sourced only from toilets (low volume flush) and washing of hands in the sink. The volume of the septic tank is 2,000 gallons and the leach line from the tank is located on the northwest corner of the property. The concentration of petroleum hydrocarbons in the septic water is not high enough to cause environmental degradation of the soil in the leach line area. This is concluded because leach lines function in a manner so that the water does not percolate down but evaporates up through the soil column. Therefore, the chemicals that make it through the tank and enter the soil around the leach line will be degraded by the bacteria in the moist soil environment.