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� Y _ <br /> WaterWork <br /> Groundwater MajL12Ljaq Protocol <br /> Monitoring depth to water and free product thickness within wells <br /> at the site will be conducted using an Interface Probe and <br /> Surface Sampler. The Interface Probe is a hand held, battery <br /> operated device for measuring depth to petroleum product and <br /> depth to water as measured from an established datum (i.e., top <br /> Of the well casing which has been surveyed) . For consistency, <br /> all measurements will be taken form the north side of the <br /> wellhead. To assess potential infiltration of :Eine grained <br /> sediments, well depth will be sounded using the Interface probe. <br /> Product thickness is calculated by subtracting the depth to <br /> product from the depth to water. In addition, water elevations <br /> are adjusted for the presence of fuel with the following <br /> calculation: <br /> (Product Thickness) ( .8)+(Water Elevation) <br /> = Corrected Nater Elevation <br /> Note: The factor of 0.8 accounts for the density difference <br /> between water and petroleum hydrocarbons. <br /> An acrylic Surface Sampler shall be used for visual inspection of <br /> the groundwater to note sheens (difficult to detect with the <br /> Interface Probe), <br /> r <br /> odors microbial action and sediments. The <br /> sampler is calibrated in inches and centimeters for visual <br /> inspection of product thickness. <br /> To reduce the <br /> Potential <br /> the monitorings will ttake fplace oin ordermfrom lthe leasteto Wemost <br /> contaminated. yells containing free producwill be monitored <br /> last. Between eac mons oring a equ pment will be washed with <br /> laboratory grade detergent and double rinsed with tap water, and <br /> final rinsed with deionized water. <br /> rr <br />