ARCHIVED REPORTS_XR0010710 - Laserfiche WebLink

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GROUNDWATER TECHNOLOGY STANDARD OPERATING PROCEDURE CONCERNING GROUNDWATER MONITORING SOP 8 Groundwater monitoring of wells at the site shall be conducted using an ORS Interface Probe and Surface Sampler. The Interface Probe is a hand held, battery operated device for measuring depth to petroleum product and depth to water as measured from an established datum (i.e., top of the well casing which has been surveyed). Product thickness Is then calculated by subtracting the depth to 1 product from the depth to water. In addition, water elevations are adjusted for the presence of fuel with the following calculation: ' (Product Thickness) (.8) + (Water Elevation) = Corrected Water Elevation NOTE: The factor of 0.8 accounts for the density difference between water and petroleum hydrocarbons. The interface Probe consists of a dual sensing Probe utilizing an optical liquid sensor and electrical conductivity to distinguish between water and petroleum products. A coated steel measuring tape transmits the sensor's signals to the reel assembly, where an audible alarm sounds a continuous tone when the sensor is immersed in petroleum product and an oscillating tone when immersed in water. The Interface Probe is accurate to 1/16-inch. ' A Surface Sampler shall be used for visual Inspection of the groundwater to note sheen s(difficult to detect with the Interface Probe), odors, microbial action, etc. tThe Surface Sampler used consists of a 12-inch long cast acrylic tube with a Delrin ball which closes onto a conical surface creating a seal as the sampler Is pulled up. The sampler is calibrated in inches ' and centimeters for visual inspection of product thickness. ' To reduce the potential for cross contamination between wells, the monitorings shall take place in order from the least to most contaminated wells. Wells containing free product should be monitored last. ' Between each monitoring the equipment shall be washed with laboratory grade detergent and double rinsed with distilled water. GROUNDWATER ' �� JL ITECHNOLOGY, INC.