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Diamond Lumber Manteca Quarterly Groundweer Monitoring Page 7 <br /> from 39,000 ppb in BEI-MWS to 3,100 ppb in BEI-MW4 Lead concentrations ranged from 310 ppb <br /> in BEI-MW6 to 24 ppb in BEI-MW4 <br /> Table 2 includes all of the available groundwater data for the monitoring wells installed by BEI in <br /> 1989 and SRK in 1991 <br /> 7 0 REGULATORY SITE VISITS <br /> No representative of any regulatory agency was present during groundwater sampling activities Ms <br /> Margaret Lagorio, Senior REHS with the San Joaquin County PHS/EHD, was informed of the field <br /> schedule <br /> 8.0 INVENTORY OF DRUMMED MATERIALS <br /> During the quarterly monitoring event on August 31, 1992, and inventory was taken of all drummed <br /> soil cuttings and purged water resulting from the installation of monitoring wells/borings and <br /> groundwater sampling events respectively Currently there are 45 55-gallon drums on-site composed <br /> of 27 drums generated during SRK's soil boring/monitoring well installation and groundwater sampling <br /> events, along with 18 drums resulting from the BEI subsurface soil/groundwater investigation in 1989 <br /> The 27 drums generated during SRK's investigations are composed of 8 drums of water purged during <br /> groundwater sampling events and 19 drums of soil The 18 drums generated by BEI are composed <br /> ' of 2 drums of water and 16 drums of soil <br /> Table 3 contains a list of where the drummed materials dre located in relation to monitoring wells <br /> and soil borings <br /> During the August 1992 quarterly sampling event, the contents of each drum was carefully labelled <br /> on the outside of each drum Analytical soil and groundwater information was included on the drum <br /> label <br /> 9.0 SUMMARY OF FINDINGS <br /> The monitoringwells installed b BEI were sampled initially b BEI in 1989, and twice b <br /> Y P Y Y y SRK <br /> (October 1991 and August 1992) Elevated levels of volatile hydrocarbons and the constituents of <br /> BTEX have been detected during each sampling event Analytical data obtained during SRK <br /> sampling events (presented in Table 2) indicates that contaminant levels are significantly elevated in <br /> BEI-MW5 than in BEI-MW4 or BEI-MW6 BEI-MWS is located along the south property line <br /> adjacent to the Southern Pacific Railroad right-ot-way (Figure 1) <br /> 'l <br /> Steffen Roberisoo and ICiaten <br />