ARCHIVED REPORTS_XR0012631 - Laserfiche WebLink

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m• GROUNDWATER TECHNOLOGY STANDARD OPERATING PROCEDURE CONCERNING GROUNDWATER MONITORING SOP B 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 and depth to water as measured (i.e. , top tile well from an establishedrdatum Product thiccknesss is k casing which has been surveyed) . depth to product fthen calculated by subtracting the water elevations then the depth to water. In addition, with the are adjusted for the presence of fuel following calculation: (Product Thickness) (,©). (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 w utilizing an Optical liquid sensor and electrical con- ductivity to distinguish between water and petroleum Products A coated steel measuring tape transmits the alarmrsoundsnalcontinuousetoneswhenit s to the y. where an audible Immersed in petroleum he sensor is when immersed in wateTprodiict and an oscillating tone to 1/16-inch. The Interface Probe is accurate _ A Surface Sampler shall be used for visual inspection o£ the groundwater to note sheens (difficult to detect with the Interface Probe), odors, microbial action, etc. 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 the and centimeters for visual inspection of product thickness. To reduce the potential for cross contamination between wells the monitorings shall take place least to most contaminated wellsin order from the . Wll Product should a containing free he monitored elast. Between each monitoring the equipment shall be washed with laboratory grade detergent and double rinsed with distilled water.