Laserfiche WebLink
III� I <br /> I <br /> A S S O C I A T E S I N C <br /> of analytical results is presented in Table 1 Laboratory data sheets and cham-of-custody <br /> documentation are contained in Attachment 2 <br /> GROUNDWATER FLOW DIRECTION <br /> Water level measurements were collected from wells MW1 through MW7, and CW on December <br /> 17, 1998 Water levels ranged from 2172 to 24 60 feet below the tops of the well casing <br /> elevations, representing an average decrease in the water table elevation of approximately 0 06 <br /> feet since September 1998 The water level data were used to develop the groundwater elevation <br /> contour map (Figure 3) Assuming that horizontal isotropic conditions prevail, groundwater in <br /> the uppermost aquifer beneath the site flowed towards the northeast The average hydraulic <br /> gradient on December 17, 1998 was calculated to be 0 006 ft/ft or approximately 32 ft/nule A <br /> summary of groundwater monitoring data is presented in Table 1 <br /> CONCLUSIONS <br /> Concentrations from wells MW1 through MW7 and CW remain consistent with the results from <br /> previous sampling events It appears as though there are petroleum hydrocarbons remaining in <br /> the soil The direction of groundwater flow and the magnitude of hydraulic gradient are <br /> consistent with the previous event Groundwater elevations have decreased since September <br /> i 1998 <br /> RECOMMENDATIONS <br /> Based on the results of the Fourth quarter 1998 monitoring episode, we recommend the <br /> following <br /> o Conduct the First Quarter 1999 groundwater monitoring and sampling wells MW 1 <br /> through MW7 and CW and analyze samples for TPHg and BTEX by EPA Method 8020 <br /> w 1625961quaA1}\4gr-1998 doc 3 <br />