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t - <br /> i <br /> 1 01 December 2004 <br /> • AGE-NC Protect No 97-0333 <br /> Page 10 of 11 <br /> • Low concentrations of off-site MTBE were detected from wells MW-11 (B-D), MW-12 <br /> ' (A-C) and MW-13B <br /> • Concentrations of PCE and/or TCE have been detected in water samples collected from all <br /> well locations associated with the Rainwater Car Wash investigation Minor to significant <br /> PCE and/or TCE concentrations were detected in 45 of 46 ground water monitoring wells <br /> located in First Zone, Second Zone, Third Zone and Primary Aquifer Zone Aquifers <br /> ' (Figure 10, Table 4) The highest concentrations of dissolved PCE were detected in the <br /> samples collected from First Zone well MW-4, from Second Zone wells MW-7 (C-D), <br /> MW-8 (B-C) and MW-1OB (upper Second Zone), and from Third Zone wells MW-7D and ' <br /> 1 MW-$D at concentrations as high as 1,100 µg11 (MW-4) <br /> • PCE and TCE are chlorinated solvents often associated with dry cleaning operations Based <br /> on the June 2004 PCE iso-concentration map in First Zone water(Figure 10),AGE interprets <br /> the PCE/TCE-plume to have originated from the dry cleaner's facility located immediately <br /> east of the Rainwater Car Wash <br /> f <br /> 1ie5.0 RECOMMENDATIONS <br /> Based upon data collected from the site, AGE recommends <br /> 1 • Continued quarterly ground water monitoring and sampling of monitoring wells MW-1 <br /> through MW-13 <br /> • Continued groundwater extraction (interim groundwater remediation) from well EW-1 <br /> 1 Generally,the core ofthe dissolved MTBE-plume appears to located in the First Zone Aquifer within <br /> the area of wells EW-1, MW-2,MW-3,MW-6 and MW-7A, outside of the dissolved MTBE-core <br /> area,only low to very low MTBE concentrations were detected on-site and off-site towards the north <br /> 1 in Second Zone,Third Zone and Pnmary Aquifer Zones Based on the data collected during the third <br /> quarter 2003, additional ground water monitoring wells are not warranted at this time and the <br /> existing monitoring well network may be sufficient to complete a site Problem Assessment Report <br /> 1 (PAR) <br /> ' 6.0. LIMITATIONS <br /> ' Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based mainly <br /> upon analyhcal results provided by ari indepeiideiit laboratory Evaluations of the hyditigeologic---- <br /> Advanced GeoEnvironmental,Inc <br />