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III f3 <br /> W� <br /> GROUNDWATER TECHNOLOGY <br /> i' STANDARD OPERATING PROCEDURE <br /> t CONCERNING GROUNDWATER MONITORING <br /> SOP 8 <br /> � 1 <br /> Groundwater monitoring of wells at the site shall be <br /> conducted using an ORS Interface probe <br /> and Surface <br /> . The Interface Probe is a band held, battery <br /> operated device for measuring depth <br /> and depth to to petroleum product <br /> water as ineasured from an established datum <br /> (i.e., tap of the well casi <br /> Product thickness is then cng which has been surveyed). <br /> alculated by subtracting the <br /> depth to product from the depth to water. <br /> In <br /> ` j water elevations are ,adjusted for the Presences offuel <br /> ` ; with the following calculation: fuel <br /> (Product Thickness) (.8)+(Water Elevation) <br /> Corrected Water_ Elevation <br /> - _ Note: The factor of 0.8 accounts .for the density <br /> I difference between water and petroleum <br /> hydrocarbons. <br /> The Interface Probe consists of a dual sensingrob <br /> utilizing an optical liquid sensor and electrcal can- <br /> distinguish distinguish between water and petroleum <br /> f, prOducts. A coated steel measuring tape 'transmits the <br /> sensor's signals to the reel assembly, where an audible <br /> 1 alarm sounds a continuous tone when the sensor is <br /> immersed in Petro' <br /> eum <br /> when immEirsed in water. The tInterfaceand an BProbetis accurate <br /> to 1/15-inch, Ste <br /> A Surface Sampler shall be used for visual inspection <br /> the groundwater to noof <br /> t <br /> the Interface Probe), adorn, microbial uactlt iorsdetect <br /> with <br /> The $ur.face .Sampler used consists of a '12-inch long cast <br /> acrylic tube with a Delrin ball <br /> conic ..which. close8 onto a <br /> al surface creating a seal as' the sampler is pulled <br /> Up. The sampler is calibrated in -inches and centimeters <br /> for visual inspection of <br /> product thickness. <br /> To :reduce the potential for cross contamination between <br /> wells the monitorings shall takep lace <br /> : . th <br /> least 'to most contaminated wells. Wells ncontainingorder fromfree <br /> Product should be monitored last. Between each. monitoring <br /> 3 the equipment shall be washed with lab <br /> orator <br /> detergent and double rinsed with distilled waterade <br />