ARCHIVED REPORTS XR0006254 - Laserfiche WebLink

Home Browse Search

Ms Diane Hinson Page 2 December 30, 1992 • Teflon bailers were used to purge the wells prior to sampling The bailers were decontarnmated prior to purging each well by washing with an Alconox solution and triple rinsing with deioruzed water Each monitoring well was developed by bailing until consecutive conductivity, pH, and temperature measurements varied by less than 10% Table 3 summarizes the number of well volumes removed from each well prior to sampling and the stable pH, temperature, and conductivity measurements Table 3 August 1992 Monitoring Well Development Data F l # Volumes Bailed pH Temperature Conductivity -4 3 728 69 4°F 1,365µS -5 3 708 68 1°F 1,199µS -6 3 710 67 4°F 1,222µS Results of August 1992 sample analyses are summarized in Table 4 and shown in Figure 2 TPH concentrations in all three wells are below 10 mg/l, and BTEX constituent concentrations were below detectable limits A separate groundwater sample was collected from MW-6 for Coliform on September 9, 1992 This sample had one colony forming unit (CFU) per 100 ml of sample • Table 4 August 1992 Analytical Results Sample TPH BTEX MW-4 0 97 mg/l < 0 5 µg/l MW-5 0 56 mg/l < 0 5 µg/l MW-6 0 57 ma/1 < 0 5 µ /l November 1992 Samples were collected from wells MW--4, MW-5, and MW-6 on November 30, 1992 Groundwater elevations were measured prior to sampling and are summarized in Table 5 The groundwater flow direction remained toward the southeast Groundwater contours are shown in Figure 3 - - - -- ---- Table 5 November 1992 Groundwater Elevations Well # Casing Elevation GW Elevation MW-4 +5 87 ft -25 25 ft MW-5 +6 08 ft -26 20 ft MW-6 +5 87 ft -26 59 €t • Wells wereur ed according t the r p g g o e p ocedures described for the August 1992 sampling event Table 6 summarizes the number of well volumes removed