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Construction workers involved in excavation within the area of impacted soil could be exposed through dermal contact, accidental ingestion, or inhalation of volatilized hydrocarbons if excavations were deeper than three feet bgs Typical installation of dispensers and product piping involve burying the piping at least three feet deep, however, as this is an active service station, construction activities involving excavation at the site should be performed by personnel trained in handling hazardous materials These workers should take precautions to properly check, and if necessary, ventilate excavations in the impacted areas Likewise, these workers should be taking proper measures to monitor air quality, wear respirators where appropriate, wear the proper clothing while working at the site, and wash prior to eating or drinking If properly trained workers are utilized, and proper care and attention is given to safety precautions and hygiene, the risk of exposure of COC's to constructions workers from either impacted soil or groundwater appears low 52 Off-site Receptors No water supply wells have been identified within a 2,000-foot radius of the study site There are few surface bodies of water immediately downgradient of the site Although the groundwater is shallow beneath the site (6 to 10 feet bgs), environmental impact to surface . waters by groundwater discharge into streams downgradient of the site does not appear likely as the nearest surface water bodies are at least 10 feet higher in elevation than the study site 5.3 Utilities Prior to septic system removal and UST replacement, it is possible that dissolved hydrocarbons could have preferentially traveled along the former leach lines to the east, along the northern border or the site Sewer and storm drains are known to run under Harlan Road Given that historical depth to water beneath the site ranges from 6 to 10 feet bgs, it appears possible that subsurface utility trenches could have acted as preferential pathways for hydrocarbon migration However, due to the lack of any highly volatile COC's in the groundwater, and due to the highly hydrophilic nature of MTBE, it is not likely that volatilization to utility vaults or trenches would occur to such levels that concentrations in air would reach risk levels It might be possible, however, that utility workers could be exposed through dermal contact or ingestion if working in the utility trenches at a time when groundwater was at a high level and had infiltrated the trenches As mentioned above however, if properly trained workers are utilized, and proper care and attention is given to safety precautions and hygiene, the risk of exposure of COC's to constructions workers from working in the utility trenches is low P Voe's Truck Plaza\Reports\SCM_09-2003Voes truck plaza SCM doc Page 13 5T7zATU5