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C f 3rd Quarter 1995,Quarterly Monitoring Report Former PureGro/Brea Facility 1905 North Broadway Avenue,Stockton,California Sierra-Pacific Project No.94-055.04 2.0 METHODS 2.1 Water-Level Measurements The surveyed wells are fitted with permanent aluminum well caps,which screw onto machined brass collar fittings. Water level measurements were made using an electronic sounding device (Appendix A). All ground-water elevation measurements were made from the referenced well- head elevations, measured to the nearest 0.01 foot. Computed ground-water elevations are relative to mean sea level (Table 1). Three-point calculations were used to predict ground- water flow directions and potentiometric surface gradients (Table 2). The elevation of the MW- 11 well casing has not been determined by survey. Water level measurements made on September 18, 1995 were not used to determine the ground-water flow direction. The potentiometric surface map (Figure 3) was computer-generated using the Surfer computer � program. I 2 2. Water am oratorAnalysis ..,,.. er lin LabS ❑ � and v- . y f Each of the monitoring wells was purged prior to sampling to. assure the collection of l representative ground-water samples from the uppermost saturated zone. Water quality ` parameters (pH, electrical conductivity, and temperature) were measured as the wells were purged.. Each of the Broadway Avenue water samples was examined for odors, coloration, and turbidity.. Saihples were collected after the field parameters stabilized. Field notes are included in Appendix B. One to five wetted-well-volumes of water were withdrawn from each of the wells prior to collection of ground-water samples. Water levels recovered-rapidly from purging and sample collection. Water purged from the wells was placed in 55-gallon drums and staged [ at the PureGro/Brea site for future disposal. Sierra-Paciflr Groundwater Consultants 2