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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 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 (i 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 1116-inch <br />' A Surface Sampler shall be used for visual inspection of the groundwater to note sheen s(difficult <br /> to 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 Delrin ball which <br />' closes onto a conical surface creating a seal as the sampler is pulled up The sampler is calibrated <br /> in 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 <br /> monitored last Between each monitoring the equipment shall be washed with laboratory grade <br /> detergent and double rinsed with distilled water <br /> ]JUP GROUNDWATER <br /> TECHNOLOGY, INC <br /> I <br />