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' Diamond Lumber Manteca Quarterly Groundwaler Monuorrng Page 9 detected in SRK-MW2 and not in SRK-MW1 or SRK-MW3 Concentrations of BTEX were detected slightly above the method detection limit (MDL) in SRK-MW1 and SRK-MW3 and not in SRK-MW2 Lead was also detected in each of the three SRK monitoring wells A total of 14 drums of soil were spread on-site near the west property line (see Figure 1) The empty drums, including one drum containing solidified concrete grout generated during monitoring well installation, are currently stored under the eaves along the west side of the western most barn There are currently 24 55-gallon drums on-site containing cuttings/purged groundwater generated during the installation/sampling of monitoring wells by SRK and BEI Table 3 contains a Iist of where the remaining drummed materials are located in relation to monitoring wells and soil borings The drums remaining contain materials which have levels of contamination above acceptable background for disposal on the property SRK performed a record search of registered wells (private, municipal, monitoringirrigation), located within 2,000-feet of the Diamond Lumber facility and identified 23 registered wells, composed of 18 municipal water wells, 14 monitoring wells Because the current static water levels and surface elevations for these wells is not available for the 23 registered wells, it is not currently known whether ' these wells support or dispute SRK gradient calculations TABLE 3 Drummed Materials Generated and Remaining from On-Site Monitoring Well Installation and Groundwater Sampling ' Litialo Qua>afrt}e of Drummed Materials ' SRK - MWt 4 55-gallon drums of water SRK- MW2 4 55-gallon drums of soil SRK -MW3 4 55-gallon drums of soil BEI -MW5 7 55-gallon drums of soil 2 55-gallon drums of water i i 1 nae.z:�a any w. Steffen Robertson and Kirsten