ARCHIVED REPORTS XR0004612 - Laserfiche WebLink

Home Browse Search

„ , 0 A S S O C I A T E S I N C The groundwater analytical results measured at monitoring well MW2 showed detectable concentrations of TPHg and BTEX TPHg was detected at a concentration of 540 llg/L, toluene was detected at 14 µg/L, and xylenes were detected at 10 Pg/L The groundwater analytical results measured at monitoring well MW3 showed detectable concentrations of TPHg and BTEX TPHg was detected at a concentration of 820 µg/L, toluene was detected at 1 4 pg/L, ethylbenzene at 5 2 pg/L, and xylenes at 4 R pg/L The Maximum Contaminant Level (MCL) for benzene, 1 pg/L, was exceeded In a groundwater sample collected from monitoring well MW I which had a detected concentration of 15 Pg/L GROUNDWATER FLOW DIRECTION Water level measurements were collected from monitoring wells MW 1, MW2, and MW3 on December 2, 2002 Water level elevations ranged from 37 47 to 37 51, representing an average Increase in water table elevation of approximately 1 31 feet since September 2002 The water level data were used to develop the groundwater elevation contour map (Figure 3) Assuming that horizontal Isotropic conditions prevail, groundwater In the uppermost aquifer beneath the site flowed towards the northwest The average hydraulic gradient on December 2, 2002 was calculated to be 0 0005 or approximately 2 7 ft/mile A summary of groundwater monitoring data Is presented In Table 1 CONCLUSIONS Groundwater flow direction and gradient Is consistent with previous sampling events Water table elevations have Increased slightly since the September 2002 monitoring event Groundwater analytical results remained within historical parameters as set by previous groundwater analytical results • W lwordpro1149811Repor1sl4QR-02 doc 3