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i J Geolo d Tzchnus Inc Page 2 Badges Specialty Center Report-Groundwater Monitoring Pro)ect No 377 2 October 13,1995 3.0 GROUNDWATER MONITORING 3.1 Hydrology of Site On September 25, 1995, the measured depth to groundwater ranged from between 7 5 and 8 5 feet below ground surface across the site The groundwater gradient had a slope of 0 0075 ft/ft, and a bearing of north 340 west (Figure 2) This contrasts with the earlier groundwater monitoring event where the gradient appeared to be to the north/northeast at approximately 0 001 ft/ft 3.2 Groundwater Sampling On September 25, 1995 monitoring wells MW-1, MW-2, and MW-3 were purged and groundwater samples collected Groundwater quality parameters recorded while purging the wells are tabulated below in Table 1 Due to the fact that the pH meter could not be successfully calibrated, the pH, although recorded, should not be considered a representative parameter Groundwater sampling procedure was performed in accordance with the groundwater sampling protocols outlined in Section 3 3 Table 1 Groundwater Quality Parameters/Purge Volumes 9/25/95 Well o ume Temp Condu p *Topof DepthWater t0VM Measu- Wetted Purged F° ctivity Casing to Level* Head- red Casing (gals) gmhos/ Water Space Total Volume CM (ft) (ppm) De th (gals) MW-1 413 819 -406 0 2040 195 �2 0 704 0690 N A Milky color -20 702 0660 N A -20 696 0620 N A MW-2 413 810 -3 97 0 1960 184 -20 685 0560 N A -20 688 0610 N A -20 690 0620 N A MW-3 4 08 7 95 -3 87 D 19 4b 184 �z a 72 a 1130 N A -20 690 1060 1 N A -20 686 1050 1 N A • Elevation of monitoring well measuring point(top of well casing) is taken from Morrow Surveying's, Monitoring Well Exhibit Prepared for CRC Environmental Risk Management,Inc,December,1994 t The OVM(organic vapor meter)measures volatile organic compounds in gaseous phase with ionization potentials less than 10.2 electron volts