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�� u t' ti F' .yY3. '.�... s �w w �y.. ,r+ ,fix• � �. MMIA, <br /> '- .►. e-.v -;;,we "' ,gi <br /> I <br /> f <br /> GROUNDWATER TEMOLOGY <br /> STANDARD OFEwNTING PROCEDURE <br /> CONCERNING GROUNDWATER MONITORING <br /> t SOP <br /> Groundwater monitoring of wells at the site shall be <br /> conducted using an ORS Interface Probe and Surface <br /> Sampler. The Interface Probe is a hand held, battery <br /> far treasuring depth to petroleum product <br /> operated device <br /> and depth to water a$ meas; from an established datura <br /> t3 <br /> (i.e. , top of the well easing which has been surveyed) . <br /> Product thickness is then calloe�atgrsin subtracting <br /> depth to product Brom the depth <br /> t� water elevations are adjusted for �;ne presence of fuel <br /> € with the following calculation: <br /> (Product Thickness) (.8)+(Water Elevation) <br /> k Corrected Water Elevation <br /> Note: The factor of 4.8 accounts for <br /> et the <br /> density <br /> difference between water and p <br /> eum <br /> hydrocarbons. <br /> The InterFAre Probe consists of a dual sensingprobe <br /> w. utilizing an optical liquid sensor and electrical <br /> etroleumn <br /> ductivity to distinguish between water and p <br /> products. A coated steel measuring tapwherenaniaudible <br /> sensor's signals to the reel assembly, <br /> alarm sounds a tone when the sensor is <br /> continuous <br /> immersed in petzcleum product and an oscillating cane <br /> t:y when immer• The Inter <br /> rsed in wateface Probe is accurate <br /> to 1/15-inch. <br /> �heensd(difficultltodetect with <br /> for neo <br /> n of <br /> A Surface Sampler shall <br /> the groundwater to odors, microbial action, <br /> the Interface Probe) , etc. <br /> The surface Sampler used consists of a 12-inch long cast <br /> acrylic tube with a Delrin ball which closes onto aulled <br /> conical surface creating a seal as the sampler is P <br /> up. esainspecis caafbproductrated ninches thic3crse5s d centimeters <br /> �. <br /> for visual <br /> To reduce the potential for crass contaminatiai� betworder from een <br /> wells the monitorings shall take p1Wellsace ncontaining. the <br /> least to most contaminated wells. <br /> product should be monit©red last. Between eachmonitoring <br /> shall be washed with laboratory gr <br /> the equipment <br /> detergent and double rinsed with distilled water. <br /> --F tiNUl�In11Tk:K <br /> mime <br /> TkxN�uia�:t ltir <br /> - ,k <br />