Laserfiche WebLink
' 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 /> INTERFACE PROBE`" Well Monitoring System and SURFACE SAMPLER" The INTERFACE PROBE" is a <br /> hand-held, battery-operated device for measuring depth to petroleum product and depth to water as <br />' measured from an established datum (i e , top of the well casing which has been surveyed) Separate- <br /> phase hydrocarbon (product) thickness is then calculated by subtracting the depth to product from the <br /> depth 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 0 01 feet <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'" consists of a 40-inch-long cast acrylic tube with a Delrin ball which closes <br /> onto a conical surface creating a seal as the sampler is pulled up The sampler is calibrated in inches <br /> 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 /> 1 <br /> GROUNDWATER <br />' TECHNOLOGY <br />