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March 10,2003 <br /> NOA Environmental Project Number:LE03-063 <br /> r.. <br /> Page 8 <br /> M. PROPOSED SITE INVESTIGATION <br /> w.. <br /> Soil Sampling Locations <br /> A total of twelve (12) soil borings will be advanced on the subject property to gain a representative <br /> sampling of potential soil contamination. Approximate locations of these borings are depicted in <br /> Figure 1; exact locations will be determined by the drilling crew on site. <br /> Four soil borings will be advanced in and around the former UST excavation site. Soil samples will <br /> be collected at intervals of five feet (5) beginning at a depth of 10.5 feet below ground surface. <br /> During the drilling process,soil samples will be analyzed for odor and discoloration. The soil borings <br /> will be terminated either at the first clay encountered or thirty feet (30')below surface grade. <br /> t. <br /> Two additional borings will be advanced adjacent to the existing in-use above-ground storage tank <br /> to a depth of five feet(5'). These borings will be advanced near the dispensers located on either side <br /> of the tank. <br /> Two borings will be advanced to a depth of ten feet 10' near the existing truck wash as well. <br /> Four shallow borings not to exceed ten feet (10) will be scattered across the property at locations <br /> to be determined based upon field inspection; likely sampling locations are shown in Figure 1. <br /> ti. <br /> The soil samples will be assessed in the field for the presence of odor and discoloration. At the <br /> discretion ofthe site supervisor, soil samples not remanded to the custody ofthe analytical laboratory <br /> will be collected and analyzed by field methods for the presence of petroleum hydrocarbons. This <br /> - procedure will consist of emptying the contents of a tube sample into a"ziplock" style plastic bag. <br /> The bag and its contents will be placed either into direct sunlight or under an alternative heat source <br /> �" for a period of time. The bag will then be pierced and the"headspace"within tested for petroleum <br /> hydrocarbons compounds with a photoionizing hydrocarbon detection device. <br /> Soils will be classified in the field during the drilling operations. It is not expected that the boring will <br /> reach the level of groundwater beneath the site. Based on groundwater data available, regional <br /> groundwater is expected to be at a depth of 40 to 50 feet below ground surface. The condition o <br /> the site with respect to aquitards, aquicludes, and perched waterrzones is unknown. <br /> �., Drilling Methodology and Equipment Decontamination Procedures <br /> Prior to initiating the drilling operation,NOA Environmental will contact Underground Service Alert <br /> L• (USA)in order to inform all public utilities that excavation and/or drilling operations would be taking <br /> place at the site. <br /> Prior to arriving at the site,all drilling and sampling equipment will be washed in a solution of <br /> trisodium phosphate (TSP) and dishwashing soap and water, and rinsed twice with tap water and <br /> once with deionized water. If cleaning is needed between samples,all drilling augers and associated <br /> LO <br />