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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, battery- <br /> operated device for measuring depth to petroleum product and depth to water as measured from an <br /> established datum (f e , top of the well casing which has ben surveyed) Separate-phase hydrocarbon <br /> (product) thickness is then calculated by subtracting the depth to product from the depth to water In <br /> addition, water elevations are adjusted for the presence of fuel with the following 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 tape <br /> transmits the sensor's signals to the reel assembly where an audible alarm sounds a continuous tone when <br /> the sensor is immersed in petroleum product and an oscillating tone when immersed in water The <br /> 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 to <br /> detect with the INTERFACE PROBE'), odors, microbial action, etc <br /> The SURFACE SAMPLER7 used consists of a 12-inch-long case acrylic tube with a Delnn ball which closes <br /> onto a conical surface creating a seal as the sampler is pulled up The sampler is calibrated in inches and <br /> centimeters for visual inspection of product thickness <br /> To reduce the potential for cross contamination between wells,the monitorings shall take place in order from <br /> the least to the most contaminated wells Wells containing separate-phase hydrocarbons (free product) <br /> should be monitored last Between each monitoring the equipment shall be washed with laboratory-grade <br /> detergent and double rinsed with distilled water <br /> _ L-4:GROUNDWATER <br /> u__ -TECHNOLOGY, INC <br />