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d L ASSkTc OCIATES INC GROUNDWATER FLOW DIRECTION Water level measurements were collected from wells MW 1 through MW3 on March 16, 2000 Water levels ranged from 23 19\to 23 75 feet below the tops of the well casing elevations, representing an average increase in the water table elevation of approximately 127 feet since December 1999 The water level data were used to develop the groundwater elevation contour map (Figure 3) Assuming that t onzontal isotropic conditions prevail, groundwater 'in the uppermost aquifer beneath the site flowed towards the northwest The average hydraulic gradient on March 16, 2000 was calculated to be 0 0004 ft/ft or approximately 2 ft/mile A summary of groundwater monitoring data is presented in Table 1 CONCLUSIONS Concentrations of petroleum hydrocarbon constituents generally decreased in well NMI, remained the same in well MW2, and increased well MW3 since the previous sampling event The direction of groundwater flow is generally consistent with the previous event Groundwater elevations have increased since December 1999 ADDMONAL SITE ACTIVITIES On February 22, 2000, ATC personnel transported six drums of soil cuttings to Forward Inc Landfill in Stockton, California for disposal On April 7, 2000, ATC personnel met with Clearwater Environmental who picked up approximately 330 gallons of purgewater from the site The purgewater was transported to Alviso Independent Oil in Alviso,Cahforrua where the water was recycled Copies of field notes and the non-hazardous waste manifests are included in Attachment 3 RECOMMENDATIONS Based on the results of the first quarter 2000 monitoring episode, we recommend the following Perform Second Quarter 2000 groundwater monitoring event in June 2000 Groundwater samples should be analyzed for TPHg and BTEX W 114981*ardyl4gr-1999&C 3