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' GROUNDWATER TECHNOLOGY <br /> STANDARD OPERATING PROCEDURE <br /> CONCERNING GROUNDWATER MONITORING <br /> SOP a <br />' Groundwater monitoring of wells at the site shall be conducted using an ORS Interface Probe and <br /> Surface Sampler The Interface Probe is a hand held, battery operated device for measuring depth <br /> to petroleum product and depth to water as measured from an established datum 0 e, top of the <br /> well casing which has been surveyed) Product thickness is then calculated by subtracting the <br /> depth to product from the depth to water In addition, water elevations are adjusted for the <br /> presence of fuel with the following calculation <br />' (Product Thickness) (8) + (Water Elevation) = Corrected Water Elevation <br /> NOTE The factor of 0 8 accounts for the density difference between water and petroleum <br /> hydrocarbons <br /> The Interface Probe consists of a dual sensing probe utilizing an optical liquid sensor and electrical <br /> conductivity to distinguish between water and petroleum products A coated steel measuring tape <br /> transmits the sensor's signals to the reel assembly, where an audible alarm sounds a continuous <br /> tone when the sensor is Immersed In petroleum product and an oscillating tone when Immersed in <br /> water The Interface Probe Is accurate to 1/16-Inch <br />' A Surface Sampler shall be used for visual Inspection of the groundwater to note sheen s(difficult to <br /> detect with the Interface Probe), odors, microbial action, etc <br />' The Surface Sampler used consists of a 12-inch long cast acrylic tube with a Deldn ball which doses <br />' onto a conical surface creating a seal as the sampler is pulled up The sampler is calibrated in <br /> Inches and centimeters for visual inspection of product thickness <br />' To reduce the potential for cross contamination between wells, the monitorings shall take place In <br /> order from the least to most contaminated wells Wells containing free product should be monitored <br />' last Between each monitoring the equipment shall be washed with laboratory grade detergent and <br /> double rinsed with distilled water <br /> 1 <br /> [$_ GROUNDWATER <br /> w TECHNOLOGY, INC <br /> I <br />