ARCHIVED REPORTS_XR0010453 - Laserfiche WebLink

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� v ATC A S S O C I A T E S I N C ANALYTICAL RESULTS The groundwater samples collected from wells MW1, MW2, MW4, MW5, MW6, and MW9 and contained detectable concentrations of TPHg and BTEX constituents The groundwater samples collected from wells MW3 and MW8 and the on-site domestic well contained no detectable concentrations of TPHg, TPHd, or BTEX The groundwater sample collected from well MW6 contained the highest concentration of MTBE The groundwater samples collected from wells MW1, MW2, MW3, MW4, MW5, MW8, and MW9 contained no detectable concentrations of MTBE although the reporting limit for MW2 was elevated due to dilution The groundwater samples from wells MW 1, MW5, and MW6 contained detectable concentrations of 1,2-DCA The groundwater samples collected from wells MW2, MW4, and MW8 and the on-site domestic well did not contain detectable concentrations of ETBE, DIPS, TAME, 1,2-DCA, and EDB Analytical results of groundwater samples are summarized In Table 2 and laboratory data sheets are contained in Attachment 2 ADDITIONAL SITE ACTIVITIES On the week of September 29, 2003, ATC personnel noticed that the standpipe for well MW8 had been knocked over apparently when the field was recently plowed ATC probed the MW8 standpipe and dug to find the well casing in an attempt to repair the well The casing was folded over at the concrete grout interface approximately I foot bgs, but the remainder of the casing did not appear to be damaged On October 28, 2003, MW8 was repaired by chiseling out 6-inches of grout to expose the intact 2-inch well casing The casing was cut off to expose a fresh surface and a new standpipe was installed with a pressure fit slip coupling The lockable steel standpipe was replaced, painted bright yellow, and secured with a 3-foot diameter apron of concrete The annulus was filled with cement grout to seal the PVC slip couple and well casing within the steel standpipe The well casing was sounded and found to be clear to a depth of 92' A waterproof well cap was installed and the steel standpipe was locked secure The elevation of MW8 was resurveyed on November 20, 2003 by utilizing a leveling transit and comparing the elevation of the top of the well casing with the known elevations of three nearby well casings, MW1, MW5, and MW9 The elevation of the MWS well casing was found to be 134 51 feet S\Enviromenta112529IVeportsWQR-2003 doe 3