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, "a ^� _F..��._-• a a. .,se�,;. _ �..._r -,,r ..may^�, <br /> a <br /> 1 <br /> h <br /> r <br /> i <br /> • the vertical extent of contamination, <br /> the thickness of the confaminaaon layer,and <br /> the maximum concentration of contamination. <br /> j ; <br /> w= The samplers will be analyzed for TPH(gasoline),B'IEX by EPA method 8015/8020 and total <br /> lead concentration by EPA method 7241. <br /> i t <br /> If groundwater is not encountered, the borings will be abandoned by grouting the boring to <br /> ` - the surface with either neat cement or a neat cement bentonite mixture. If groundwater is <br /> encountereu, monitoring wells will be installed in the three borings. The wells will be <br /> constructed of 2-inch diameter schedule 40p <br /> VC Piping. °The wells will' be installed to a <br /> depth of 10 feet below the groundwater surface. A typical monitoring well construction is <br /> shown on Figure 3. <br /> 2.2 GROUNDWATER <br /> r-� <br /> LF groundwater is encountered during the field investigation, groundwater samples will be <br /> collected. Groundwater level measurement and the thickness of free product(if present)will <br /> be taken in each well prior to purging. Each well will be purged a minimum of three well <br /> casing volumes or until bailedrior to <br /> �' sampling.. <br /> P p' g The water generated during the <br /> sampling, developing, and purging operations will be placed in 55-gallon drums. Proper <br /> disposal of the water will be based on the analytical results. Water quality parameters <br /> (specific conductance,,pH and water temperature) will be measured before sampling. The <br /> samples, will be collected utilizing a clean Teflon bailer. The samples will be placed in <br /> laboratory prepared containers and stored in an ice chest(with ice or blue ice). Under chain <br /> or custody, the sample will be taken to a DHS certified analytical laboratory to be analyzed <br /> for TPH(gasoline), BTEX and total lead. If the monitoring well is located within 50 feet of <br /> z sewer line, the sample will be analyzed for fecal coliform. <br /> i . <br /> iS <br /> 71CVLBAJMMORMAAr.wa 07.0l.91MLg `.z <br />