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1 <br />' GROUNDWATER TECHNOLOGY, INC <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 Environmental Equipment <br /> (ORS) INTERFACE PROBE'" and SURFACE SAMPLER'" The INTERFACE PROBE� is a hand-held, <br /> battery-operated device for measuring depth to petroleum product and depth to water as measured from <br /> I an established datum (i e , top of the well casing which has ben surveyed) Separate-phase <br /> hydrocarbon (product) thickness is then calculated by subtracting the depth to product from the depth <br /> to water In addition, water elevations are adjusted for the presence of fuel with the following <br /> calculation <br /> (Product Thickness) (0 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 which utilizes an optical liquid sensor and <br /> electrical conductivity to distinguish between water and petroleum products A coated steel measuring <br /> tape 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 1/1 6th inch <br /> A SURFACE SAMPLER'" shall be used for visual inspection of the groundwater to note sheens (difficult <br /> to detect with the INTERFACE PROBE'"), odors, microbial action, etc <br /> The SURFACE SAMPLER'" used consists of a 12-inch-long case 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 in <br /> 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 order <br /> from the least to the most contaminated wells Wells containing separate-phase hydrocarbons (free <br /> product) should be monitored last Between each monitoring the equipment shall be washed with <br /> laboratory-grade detergent and double rinsed with distilled water <br /> GROUNDWATER <br /> TECHNOLOGY, INC <br /> I <br />