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Geoingccd 7'echnas ltic Page 3 3"'Quarter 2003 61oundwatet Moiiitosinb Repast Projeo No 507 2 Novciiibei 13, 2001 ' water table between the wells The calculation considers the slope of the water table and the distance in a down-giadient direction between the two wells used in the calculations ' J calculating the vertical groundwater Figure 2 shows the ]oc.ation of the well cluster used for c g ' gradient in this report, MW-9 and MW-109 Table 1 shows Summary of Water Level and Gradients Slope and 13earuig, and Table 2 shows the calculated vertical gradients The information used in the calculations is shown below Vertical giadicnt i,ah ulation formulas are as follows • Vertical -oi i e0ion toi gi adient [(gw gradient slope) x (distance) = vertical correction] ' • Vertical head [(head o I sleep well) - (head of shallow+ correction) = vertical head] Veitical gi adient [(vee ticat head) / (vertical distance) = vertical gradient] For the Septembei 2003 moiiitoting event a vertical gradient was calculated for the MW- 9/MW-109 paii 'I lie veitical giadient was negative (a downward direction) at 0 004 ft/ft and approximately I I times the inagnitude of the horizontal gradient of the water table (0 003) 1.2 Groundwatei Sampling Piocedure On Septeiiibei 11, 2003, Doti Light of Del-Tech mobilized to the site to conduct groundwatei monitoring of the site's eleven monitoring wells Before sampling was attempted, the wells were sounded for depth to water and then a clear disposable bailer was used to detem mic if1loatnig pioduct was present No free product was noted for this event The wells weds puttied of tit least three well volumes of stagnant water using a dedicated Wateita cheld,,-ball assembly and '/2 inch tubing Purging continued until the temperature, conductivity, find 1+1 of the gioundwater stabilized (<10% variation in three consecutive icadings), indicating that formation water representative of aquifer conditions was entering the wells These water duality parameters were measured at intervals of each well volume purged ' Once purging was complete, a water sample was collected from the Waterra tube Care was taken to minimize sample agitation Once the sample container was filled and capped, the ' bottle was invei led, tapped and checked for headspace bubbles The sample container was identified and labeled with a unique designation, inserted into a foam holder and placed into ' an ice chest t oolcd to 4°C 1oi tiansport to the laboratory All non-disposable Sampling equipment was decontaminated using a hot water washer and detergent Mote and between uses Disposable gloves were used by the technician to collect all samples anti wei c changed with each sample collection 1