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Ciealogfut Teeknccs Itm Page 3 <br /> 2"d Quarter 2003 Groundwater Momtoruig Report <br /> Project No 507 2 <br /> September 24, 2003 <br /> ' Figure 2 shows the location of the well cluster routinely used for calculating the vertical <br /> groundwater gradients, MW-9 and MW-109 Table 1 shows Summary of Water Level and <br /> ' Gradients Slope and. Bearing, and Table 2 shows the calculated vertical gradients The <br /> information used in the calculations is shown below <br /> ' Vertical gradient calculation formulas are as follows <br /> • Vertical correction for gradient [(gw gradient slope) x (distance) = vertical correction] <br /> ' • Vertical head [(head of deep well) - (head of shallow + correction) = vertical head] <br /> • Vertical gradient [(vertical head) / (vertical distance) = vertical gradient] <br /> For the June 2003 monitoring event a vertical gradient was not calculated for the MW- <br /> 9/MW-109 pair due to the variable gradients noted above The historical vertical gradients <br /> are negative (a downward direction) and of larger magnitude than the horizontal water table <br /> gradients <br /> ' 1.2 Groundwater Sampling Procedure <br /> On June 24, 2003, Don Light of Del-Tech mobilized to the site to conduct groundwater <br /> monitoring of the site's eleven monitoring wells Before sampling was attempted, the wells <br /> were sounded for depth to water and then a clear disposable bailer was used to determine if <br /> floating product was present No free product was noted for this event The wells were <br /> ' purged of at least three well volumes of stagnant water using a dedicated Waterra check-ball <br /> assembly and 1/2 inch tubing Purging continued until the temperature, conductivity, and pH <br /> of the groundwater stabilized (<I 0% variation in three consecutive readings), indicating that <br /> ' formation water representative of aquifer conditions was entering the wells These water <br /> quality parameters were measured at intervals of each well volume purged <br /> ' Once purging was complete, a water sample was collected from the Waterra tube Care was <br /> taken to minimize sample agitation Once the sample container was filled and capped, the <br /> bottle was inverted, tapped and checked for headspace bubbles The sample container was <br /> ' identified and labeled with a unique designation, inserted into a foam holder and placed into <br /> an ice chest cooled to 4°C for transport to the laboratory <br /> ' All non-disposable sampling equipment was decontaminated using a hot water washer and <br /> detergent before and between uses Disposable gloves were used by the technician to <br /> collect all samples and were changed with each sample collection <br /> A chain of custody document, listing all samples collected, accompanied the samples from <br /> ' field to laboratory, thereby providing a means to track the movement of and insure the <br /> integrity of the samples <br />