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' GROUNDWATER TECHNOLOGY <br /> STANDARD OPERATING PROCEDURE <br />' CONCERNING GROUNDWATER MONITORING <br /> SOP g <br />' Groundwater monitoring of wells at the site shall be conducted using an ORS Interface Probe and <br /> Surface Sampler The Interface Prone Is a hand held, battery operated device for measuring depth to <br />' petroleum product and depth to water as measured from an established datum (i e , top of the well <br /> casing which has been surveyed) Product thickness is then calculated by subtracting the depth to <br />' product from the depth to water In addrhon, water elevations are adjusted for the presence of fuel with <br /> 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 tone <br />' when the sensor is Immersed in petroleum product and an oscillating tone when immersed in water <br /> 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 Delrin ball which closes <br /> onto a conical surface creating a seal as the sampler is pulled up The sampler is calibrated in Inches <br /> and centimeters for visual Inspection of product thickness <br /> To reduce the potential for cross contamination between wells, the monitorings shall take place in order <br /> from the least to most contaminated wells Wells containing free product should be monitored last <br /> Between each monitoring the equipment shall be washed with laboratory grade detergent and double <br /> rinsed with distilled water. <br /> GROUNMATER <br /> �y_l TECHNOLOGI, INC <br />