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J groundwater morutonng wells within the uppermost aquifer in order to assess groundwater <br /> quality The boring/well locations are plotted on Figure 2 Field methodology and analytical <br />' results are discussed in detail in RESNA's Interim Problem Assessment Report, dated January 13, <br /> 1992 <br /> 1 The site's station building and garage were demolished in December 1994 to facilitate corrective <br /> action activities including the removal of hydrocarbon contaminated soil which was present <br /> beneath the station building The demolition of the station building was requested in PHS/EHD <br /> correspondence dated July 7, 1994 A required demolition asbestos survey conducted previously <br /> on the station building determined the presence of asbestos containing materials E T <br /> Abatement, of Modesto, Califorma, properly removed and disposed of the site's suspected <br />' asbestos containing materials on November 11, 1994 <br /> 1 In February 1995, Smith Technology personnel supervised the excavation of approximately 1,400 <br /> cubic yards of soil from the vicinity of the former underground storage tanks Approximately <br /> 10,000 gallons of groundwater was pumped from the open excavation into an on-site Baker Tank <br />' Following the collection of confirmation soil samples, the excavation pit was backfilled with <br /> imported self compacting material The excavation was limited to the northwest by a municipal <br /> well compound and associated underground utilities (including a high volume six-inch water <br /> main) and to the northeast by a postal building Excavation activities are discussed in detail in <br /> Smith Technology's Excavation Summary Report, dated October 24, 1995 <br /> 3.0 OBJECTIVE AND SCOPE OF SITE ASSESSMENT <br /> 1 The purpose of this work was to further delineate the extent of hydrocarbon affected soil and <br /> groundwater at the site as requested by PHS/EHD, evaluate cumulative project data, and to <br /> propose remedial alternatives for soil and groundwater which have been impacted by petroleum <br />' hydrocarbons <br /> The work performed for this the most recent phase of the investigation included locating <br /> 1 underground utilities, obtaining permits from the PHS/EHD, procuring access agreements for <br /> adjacent property owners, advancing eight soil borings, collecting soil and groundwater samples, <br /> and laboratory analysis of submitted samples Additionally, selected soil samples were analyzed <br /> 1 for physical parameters which would support fate and transport modeling should such modeling <br /> be needed at a future date <br /> All drilling activities were performed under the supervision of an experienced Smith Technology <br /> field geologist and was performed in accordance with the field methods included in Smith <br />' Technology's PHS/EHD approved Work Plan for Further Delineation of Subsurface Petroleum <br /> Hydrocarbon Contamination, dated January 4, 1996 <br /> w 194326WpmU\,um�pt_doc 2 <br /> 1 <br /> 1 <br /> SWftH <br />