Laserfiche WebLink
GROUNDWATER GRADIENT AND FLOW DIRECTION <br /> Figure 4 shows the groundwater elevation gradient and flow direction determined from <br /> depth to water measurements at three of the four on-site monitor wells on December 12, <br /> 2001 Monitoring well MW4 is completed between 70 and 80 feet bgs and was not used <br /> to determine the flow direction and gradient of the uppermost aquifer that was measured <br /> by MW1-MW3 The groundwater elevation has decreased by an average of 1 26 feet <br /> since the previous quarterly monitoring round on August 21, 2001 The flow direction is <br /> to the northeast The overall gradrent is 0 002 feet/linear foot <br /> RESULTS OF CERTIFIED ANALYSIS OF GROUNDWATER SAMPLES <br /> The results of the certified analyses of groundwater samples collected from the four <br /> monitor wells on December 12, 2001 are shown in Table I Copies of the laboratory <br /> reports are included as Appendix C of this report <br /> TPH-G concentrations in MW 1-MW3 ranged from a maximum of 13000 ug/1 at monitor <br /> well MW I to 1600 ug/1 at monitor well MW2 Monitor well MW4, completed in a lower <br /> aquifer, showed a TPH-G concentration of 360 ug/1 <br /> Benzene concentrations in MW I-MW3 ranged from a maximum of 4300 ug/l at MW 1 to <br /> 290 ug/1 at MW2 Monitor well MW4 showed a benzene concentration of 7 ug/l <br /> MTBE concentrations in MW I-MW3 ranged from a maximum of 35 ug/1 at MW3 to 6 9 <br /> ug/l at MW2 MTBE was not detected above 0 5 ug/1 in MW4 <br /> Figure 5 shows the distribution of TPH-G, BTEX, and MTBE in groundwater and the <br /> estimated lateral limits of the TPH-G in groundwater as determined from groundwater <br /> samples collected on December 12, 2001 <br /> RECOMMENDATIONS <br /> ■ Coordinate collection of First Quarter 2002 groundwater data at 1211 S Turnpike Rd <br /> with Advanced Geo Environmental (AGE'S ) First Quarter 2002 Groundwater <br /> Monitoring round at 1201 S Center Street <br /> ■ Review AGE's report of results from the installation of CPT testholes at 1201 S <br /> Center and prepare workplan for installation of additional offsite wells <br /> 3 <br /> 1 <br /> 3 Arc Pump QM 10-12, 2001 <br />