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cie0bgicalTechnics lnc Page 3 <br /> ' 4`h Quarter 2002 Groundwater Monitoring Report <br /> Project No 507 2 <br /> March 7,2003 <br /> ' Figure 2 shows the location of the well cluster used for calculating the verticalg roundwater <br /> gradient in this report, 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 December 2002 monitoring event a vertical gradient was calculated for the MW- <br /> 9/MW-109 pair The vertical gradient was negative (a downward direction) and <br /> approximately 1 4 times the magnitude of the horizontal gradient of the water table <br /> ' <br /> 1.2 Groundwater Sampling Procedure <br /> P g <br /> ' On December 20, 2002, Don Light of Del-Tech mobilized to the site to conduct <br /> groundwater monitoring of the site's eleven monitoring wells Well MW-6 was submerged <br /> under pooled storm water and was not accessible for the event <br /> Before sampling was attempted, the wells were sounded for depth to water and then a clear <br /> ' disposable bailer was used to determine if floating product was present No free product <br /> was noted for this event The wells were purged of at least three well volumes of stagnant <br /> water using a dedicated Waterra check-ball assembly and '/2 inch tubing Purging continued <br /> ' until the temperature, conductivity, and pH of the groundwater stabilized (<10% variation in <br /> three consecutive readings), indicating that formation water representative of aquifer <br /> conditions was entering the wells These water quality parameters were measured at <br /> ' 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 /> 1 <br />