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Ms. Margaret Lagorio <br /> August 27, 1991 <br /> Page 3 <br /> under chain-of-custody protocols to McLaren/Hart Analytical Laboratory (a <br /> State-certified laboratory) for analysis. Samples will be analyzed for total petroleum <br /> hydrocarbons (TPH) by EPA Method (modified) 8015 and total volatile aromatic <br /> compounds (TVA) by EPA Method 8020. <br /> Field headspace measurements will be completed after samples collected for <br /> laboratory analysis have been properly preserved. Head space analyses will be <br /> completed on materials extruded from a sample sleeve into a Ziplocm bag. After <br /> the materials are extruded into the bag, the bag will be sealed and placed in the sun <br /> for approximately five minutes to allow soil to equilibrate with the head space in the <br /> bag. Volatile organic compound concentrations will be measured with a <br /> photoionization detector (PID). <br /> Soil materials encountered in the boring will be logged in accordance with the <br /> Unified Soil Classification System. Results of visual or olfactory observations for <br /> petroleum hydrocarbon contamination and headspace measurements will also be <br /> recorded on the boring log. <br /> Proposed Monitoring Well Construction Diagram <br /> Since the proposed downgradient well will be placed in the vicinity of MW-2, it is <br /> anticipated that construction details for the proposed well will be similar to those of <br /> MW-2. A copy of the Soil Boring Log for existing monitoring well MW-2, including <br /> details of construction for that well, is attached. If subsurface conditions are <br /> significantly different from those encountered in MW-2, construction details may <br /> require modification. <br /> Underground Utilities Site Map <br /> A site map showing underground utilities identified at the site is attachment. No <br /> underground utilities have been identified in the vicinity of the proposed <br /> downgradient well. In addition, in accordance with McLaren/Hart standard <br /> operating procedures, just prior to well construction, Underground Service Alert <br /> (USA) will be asked to perform a utility clearance. <br /> P <br /> Laren <br /> art <br />