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0 0 <br />Clayton Group Services Page 3 <br />Standard Operating Procedures <br />SOP -6 - Groundwater Well Development and Surveying <br />All well -development information and procedures should be annotated in detail in the <br />field logbook, documented by photographs, and posted on the attached "Well <br />Development and/or Groundwater Sampling Data" sheet. <br />Decontamination of all field equipment shall be conducted following proper procedures <br />(Standard Operating Procedure - Decontamination of Field Equipment - SOP -3). <br />All well development water and decontamination water should be properly stored, <br />labeled, and disposed. <br />WELL SURVEYING <br />In general, the location of each well should be accurately surveyed so that contaminant <br />distribution and hydrogeologic data can be plotted accurately. Commonly, a Brunton or <br />other accurate compass, measuring tape and/or walker can be used to accurately define <br />well locations relative to a fixed landmark such as the corner of a building. <br />Similarly, well elevations should be surveyed to the nearest 0.01 foot to assure accurate <br />water level measurements since very minor differences in groundwater elevations are <br />indicative of groundwater floe direction and velocity. At a minimum, elevations should <br />be determined relative to each other and a common local assumed benchmark (datum) or <br />to an established National Geodetic Vertical Datum (N.G.V.D.) elevation benchmark. <br />The overseeing regulatory agency may require that these surveys be conducted by a <br />licensed surveyor. <br />An identifying permanent mark should be placed on the top of the well casing, generally <br />in indelible ink or permanent marker, and elevations made to this mark. Subsequent <br />depth to groundwater measurements then are taken from this same mark to assure <br />accurate relative groundwater elevation determinations. <br />S \Ennr\ProjiSPOs�SOP-6.doc <br />