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29 September 1998. AGE-NC Project No. 98=0492 Page 2.of 6 2.2. PREVIOUS.INVESTIGATIONS It is our understanding that a previous subsurface investigation was'performed in 1993. Two soil borings and-three ground water monitoring wells were'drilled and sampled at the site. According to Ms. Pontes,,.no hydrocarbon-impacted -soil. or.,groiind water were.encountered during the investigation. However, AGE was not provided withh-c pies'of the report of previous.investigation for review. 2.3. REGIONAL GROUND WATER DEPTH AN FLOW DIRECTION According the.information obtained from the .initial site assessment, ground-water depth in the vicinity of the site,is approximately 15 to 20 feet bs . Regional ground water flow direction is generally northwest to north-northeast. However,both gfound water depth and flow direction-at the. site can vary seasonally. 3.0. SCOPE OF WORK The existing USTs at the site were lined in 1993.New piping "andcathodicprotection is scheduled - to be installed at the site..However,..in'accordance With PHS=EHD requirements; prior to.upgrade,. soil and/or.ground.water samples must becollected be eath.the USTs to determine,if a release.has occurred since lining of the. USTs. The proposed investigation at .the site will consist of the .. following tasks:, • Permitting and pre-field work activities; • -.Soil sample collection and analysis; .Ground water sample collection and.analysis-(if required); • Report preparation. Each of these tasks is described in more detail below. 3.1. PERMITTING AND PRE-FIELD WORK:AC IVITIES"- f Applicable site assessment permits will be obtained fro the PHS-EHD.As required'by PHS-EHD permitting, a health and safety plan will be.prepare'd in accordance with Occupational-Safety and . Health Guidance Manual for Hazardous Wasle,Site Ac ivities (National lnstitute for Occupational Advanced GeoEnvirnnmcntel,Inc.