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i <br /> Groundwater Monitoring Protocol <br /> Monitoring depth-to-water and apparent product thickness <br /> within wells at the site will be conducted using an Inter- <br /> face Probe/electric water probe and clear acrylic bailer. <br /> The Interface Probe is a hand held, battery operated device <br /> for measuring depth to petroleum product and depth-to-water <br /> as measured from an established datum (i.e. , top of the well <br /> casing which has been surveyed) . For consistency, all meas <br /> urements will be taken from the north side of the wellhead <br /> at the survey mark. To assess potential infiltration of <br /> fine grained sediments, total well depth will also be sound- <br /> ed. <br /> Apparent product thickness is calculated by subtracting the <br /> depth-to-product from the depth-to--water. In addition, water <br /> elevations are adjusted for the presence of fuel with the <br /> following calculation: <br /> (Apparent Product Thickness) (.8)+(Water Elevation) <br /> = Corrected Water Elevation <br /> Note: The factor of 0.8 accounts for the density <br /> difference between water and petroleum <br /> hydrocarbons. <br /> Newly installed wells will be allowed to <br /> stabilize for 48 hours after development <br /> prior to free product inspection. <br /> An acrylic Surface Sampler will be used for visual inspection <br /> of the groundwater in order to note sheens (difficult to <br /> detect with the Interface Probe) , odors, microbial action and <br /> sediments. The sampler is calibrated in inches and centime- <br /> ters for visual inspection of any recovered product. <br /> To reduce the potential for cross contamination between <br /> wells, the monitorings will take place in order from the <br /> least to most contaminated. Wells containing free product <br /> will be monitored last. Between each well, the equipment <br /> will be decontaminated. <br />