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Mr. Harlan Knoll 3 July 2, 1991 <br /> Monitoring Well Development Purging and Sampling <br /> Prior to monitoring-well development and purging for <br /> sample collection, depth to groundwater will be measured using a <br /> steel tape and chalk or an electronic water-level indicator. The <br /> well will be checked for the presence of free product and sheen. <br /> If free product is detected, free product thickness will be <br /> measured using steel tape and water and gas-finding paste. <br /> The well will be developed at least 72 hours after it <br /> has been installed, by purging and over-pumping until the water <br /> discharged is clear. at least 72 hours after development, the <br /> well will be purged of a minimum of 4 casing volumes by either <br /> bailing or pumping. During purging prior to sampling the field <br /> parameters of temperature, pH, and conductivity will be monitored. <br /> When these are stabilized and a minimum of four casings has been <br /> purged, groundwater samples will be collected. All water <br /> discharged from the wells during development and purging will be <br /> stored in DOT-approved drums pending proper disposal. <br /> Groundwater samples will then be collected using a <br /> Teflon bailer. The samples will be poured into 40-milliliter <br /> volatile organic analysis (VOA) vials, and one-liter amber bottles <br /> and capped with Teflon-lined screw caps . The VOA vials will be <br /> overturned and tapped to be sure no bubbles are present. The <br /> sample bottles will then be labeled and placed in a cooler with <br /> ice until they are delivered to a state-certified laboratory. <br /> Chain-of-custody documentation will accompany the samples to the <br /> laboratory. <br /> Analysis of Soil Samples <br /> Soil samples collected from the borings will be analyzed <br /> for Total Petroleum Hydrocarbons as Gasoline using EPA Method 5030 <br /> in conjunction with modified EPA Method 8015 for Total Petroleum <br /> Hydrocarbons as Diesel using EPA Method 3550 in conjunction with <br /> modified EPA Method 8015 and for Benzene Toluene, Ethylbenzene, <br /> and Xylenes using EPA Method 8020 cid 7`o��oi�aM�yr2ase as ,I re/dr 0 � <br /> A soil sample collected from the auge/red hole adjacent <br /> y///(/1� <br /> to the hydraulic lift will be analyzed for the presence of <br /> hydraulic fluid using EPA method 418 . 1 . <br /> Report Preparation <br /> A report documenting soil boring installation, sample <br /> collection, and sample results will be prepared. Included in the <br /> report will be copies of the boring logs, and tables summarizing <br /> the analytical results of the soil samples . <br />