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The temperature, conductivity and pH of the groundwater in each well was measured and recorded prior to well purging (initial) and following completion of well purging (final) This data was used to gauge the progress of the well purging operations Stabilization of the data indicated the adequate removal of "well casing" water and subsequent recharge with "fresh" formational water Table I lists the initial and final well data values TABLE I Temperature, Conductivity and Acidity Groundwater Measurements Monitoring WeU Temperature(•F) Conductmty(x100 As/cm) Acidity(pH) MW 1 i=760 i=8 55 i=7 35 f=749 f= 930 f=740 MW 2 i=76 8 1=9 30 i=7 39 f=75 0 f=9 75 f=753 MW-3 N/A N/A N/A MW 6 N/A N/A NIA MW-8 t=752 i-1052 i=729 f=771 f=11 49 f=743 NOTES • i Initial • f Final • NIA Not available While obtaining the groundwater samples, particular attention was paid to whether any noticeable petroleum hydrocarbon odor, discoloration or floating product was evident in the wells The following was noted during our sampling • MW-1 had a strong petroleum hydrocarbon odor No floating product or discoloration was noted • MW-2 had a moderate to strong petroleum hydrocarbon odor No floating product or discoloration was noted i • MW-3 had no noticeable odor, floating product or discoloration • MW-6 had no noticeable odor, floating product or discoloration • MW-8 had no noticeable odor, floating product or discoloration GROUNDWATER SAMPLE RESULTS Table II summarizes the results of laboratory analyses for groundwater samples obtained during our April 1992 quarterly groundwater sampling Included in Table 11 are the State of California Maximum Contaminant Levels (MCL's) for the constituents analyzed during our sampling Figure 2 illustrates the . locations of the monitoring wells and their corresponding contaminant concentrations A copy of the laboratory results is included at the end of this letter HLANDERSON CONSULTING GROUP