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I GROUNDWATER TECHNOLOGY STANDARD OPERATING PROCEDURE _ CONCrR.NTNG GROUNDWATER MONITORING SOP 8 Groundwater monitoring of wells at the site shall be conducted using an ORS Interface Probe and Surfacii 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 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 o difference between awatertand petroleumsity hydrocarbons. The Interface Probe consists of a dual sensing probe utilizing an optical liquid sensor and electrical con- ! ductivity to distinguish between water and petroleumtra ` ts the products. A coated steel measuring tape where nanlaudible sensor's signals to the reel assembly, alarm sounds a continuous tonimmersed in e when the sensor is and an tone immersed inowater.roThetinterfacesProbetisg when accurate when - to 1/16-inch. A Surface Sampler shall be used for visual inspection of the groundwater to note sheens (difficult crobial tondetect with the Interface Probe) # c. The 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 takesplaceainnation order from the en wells the monitorings shall least to most contaminated wells. Wells containing free product should be monitored last. Between eacho nitoring the tmnolbe seteder ade detergentequipment shall rinedwithdistilllaboratory GRnUNWATER i FCHNOLOGY.INC.