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GROUNDWATER TECHNOLOGY <br /> STANDARD OPERATING PROCEDURE <br /> CONCERNING GROUNDWATER MONITORING <br /> SOP 8 <br /> Groundwater monitoring of wells at the site shall be <br /> conducted using an ORS Interface Probe and Surface <br /> Sampler. The Interface Probe is a hand held, battery <br /> operated device for measuring depth to petroleum product <br /> and depth to water as measured from an established datum <br /> (i.e., top 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 /> s FQ 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 <br /> hydrocarbons. petroleum <br /> The Interface Probe consists of a dual sensing <br /> utilizing an optical liquid sensor and electrcalocon- <br /> ductivity to distingish between water and petroleum <br /> � . products. A coated steel measuring tape transmits the. s sensor's signals to the reel assembly, where an audible <br /> alarm sounds a continuous tone when the sensor is <br /> s immersed in petroleum product and an oscillatingtone <br /> when immersed in water. The Interface Probe isaccurate <br /> to 1/16-inch. <br /> e <br /> { A Surface Sampler shall be used for visual inspection of <br /> the groundwater to note sheens (difficult to detect with <br /> i the Interface Probe), odors, microbial action, etc, j. <br /> kThe Surface Sampler used consists of a 12-inch longcast <br /> '514 acrylic tube with a Delrin ball which closes -onto <br /> conica surface creating a seal as the sampler is pulled <br /> P p led <br /> up. The sampler is calibrated in inches and centimeters <br /> for visual inspection of product thickr_ess. <br /> To reduce the potential for cross :contamination .uetween <br /> k� wells the monitorings shall take place in order from the <br /> least to most contaminated wells. Wells containing free <br /> product should be monitored last. Between each monitoring <br /> R the equipment shall be washed with laboratory grade <br /> ,. detergent and double rinsed with distilled water., <br /> r <br /> j GROUNDWATER <br /> E!ITECHNOLOGYINC. <br /> t CONSULTING GROUNDWATER GEOLOGISTS <br /> �i <br /> ,r ,. - - <br />