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WE- <br /> A t �4J <br /> Y <br /> GROUNDWATER TECHNOLOGY <br /> STANDARD OPERATING PROC-1-mu <br /> CONCERNING GROUNDWATER MONITORING <br /> SOP 8 <br /> Groundwater monitoring of welln at the site shall be <br /> conducted using an CRS Interface Probe and Surface <br /> Samnler. The Interface Probe is a hand held, battery <br /> operated device for reasuring depth to petroleum product <br /> and depth to water as measured from an established datum <br /> (i.e. , too of the well casing which has been surveyed) . <br /> Product thickness is then calculated by subtracting the <br /> depth to product from the depth to water. In addition, <br /> water elevations are adjusted for the presence of fuel <br /> with the following calculation: <br /> (Product Thickness) (.8)+(Water Elevation) <br /> Corrected Water Elevation <br /> Note: The factor of 0.8 accounts for the density <br /> difference between water and petroleum <br /> hydrocarbons. . <br /> The Interface Probe consists of a dual sensing probe <br /> utilizing an optical licuid sensor and electrical con- <br /> ductivity to distinguish between water and petroleum <br /> Products. A coated stem measuring tape transmits the <br /> sensor's signals to the reel assembly, where an audible <br /> alarm sounds a continuous tone when the sensor is <br /> imriersed in Petroleum product and an oscillating tone <br /> when immersed in water. The Interface ?robe is accurate <br /> to 1/16-itch. <br /> A Surface Sampler shall be used for visual inspection of <br /> the groundwater to note sheens (difficult to detect with <br /> the Interface Probe) , edc,s, mie_obial action, etc. <br /> The Surface Sampler used consists of a 12--inch long. cast <br /> acrylic tube with a uel_in ball Whic. closes enzo a <br /> conical surface creaz_nq a seal as the sample= is uullec <br /> up The sampler is calibrated in =aches and cent-mezers <br /> for visual inspection cf product thickness. <br /> To reduce the -iz �c= cross ccn;.==4nat4cn between <br /> wells the muni a i.1cs shall- take place in order z_C i :e <br /> least to most cc:iwaa_n ated wedg,s. Wells contain-znf--'2'e <br /> rccuct should be mcnitored last. Between each <br /> he ecu_ -rent shales oe washed w,-.. labcratcry grace <br /> ce_ercent a:c ccuble __used with _istillea water. <br />