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Mr. `Fran Forkas January 13, 1989 Page 4 MONITORING PROGRAM Parameters to be measured and the frequency of measurements are defined in the Waste Discharge Permit . In collecting the , groundwater, it is important to take the necessary precautions to obtain samples that are representative of the water- .passing the monitoring well at the time of sampling. Current sampling practice for obtaining representative samples involves the following procedures : I . Pump or bail a minimum of four well volumes from the well . A well volume is computed each time the well is sampled and is the volume of water in the bore hole, including the water in the packing outside the well casing. The volume is computed by subtracting the distance measured to the water surface from the total depth of the well and multiplying this result by the area of the borehole. 2 . After the 4 volumes have been removed, measure the pH and specific conductance of a -sample using portable instruments and record the data. This data should be retained for future reference. 3. Pump or bail another well volume and repeat step 2 field measurements . 4 . Compare the values for pH and specific conductance. If they are the same, collect samples in appropriate containers for the remainder of the parameters to be measured. If there is a significant difference, repeat step 3. until two successive field measurements yield similar results . SUMMARY Four wells are recommended for monitoring the groundwater characteristics under the planta The recommended locations and depths are anticipated to yield water samples that are representative of water moving onto the site and off of the site including the effectiveness of the soils in the percolation ponds in filter the wastewater. Prior to constructing the monitoring wells, however, we recommended that the' City submit the report to the RWQCB for review Particularly as regards to our recommended locations for them.