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Union Safe Deposit Workplan 4.0 TECHNICAL APPROACH Based upon review of previous investigations conducted in the vicinity of the subject property and published data regarding local geographic and hydrologic conditions, Augeas Corporation developed the following technical approach for the proposed investigation. In order to accomplish the goals established for the proposed investigation,the project would be separated into three distinct work items as follows: I, Field Investigation to advance exploratory soil borings for the purpose of logging subsurface conditions and obtaining sub- surface soil samples for chemical analysis. Four soil borings will be completed and a Hydropunch groundwater sample taken from one of the borings. Laboratory analysis of subsoil and groundwater samples obtained from the field investigation to evaluate the presence and concentration of petroleum constituents contamination. III. Report preparation summarizing the results of the chemical analysis and including Augeas' conclusions and recommen- dations regarding the site. TASK I FIELD TESTING Augeas proposes to install a of four exploratory soil borings at the locations shown on Augeas' Drilling Permit Application. The purpose of these soil borings is to provide additional data regarding the presence of hydrocarbons in C subsoils. Field screening of the subsoils samples will help to describe hydro- carbons persistence in a vertical relationship to groundwater. One of the four exploratory soil borings will be Hydropunched and a ground- water sample gathered.The sample will be utilized to evaluate the presence of hydrocarbons in groundwater, and provide data for assessing groundwater L depth and quality. Based upon site investigations conducted for nearby properties,we anticipate groundwater occurs beneath the subject property at depths ranging from 30 to 50 feet below the existing grade. Project Number: UNS622 Page 4 of 8