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27 May 2004 <br /> AGE-NC Project No 02-0964 <br /> Page 3 of 4 <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> Two ground water samples were collected and submitted for laboratory analysis The analysis <br /> detected TPH-g in ground water sample MW-1 at a concentration of 9,100 micrograms per liter <br /> (µg/1) In addition,BTEX compounds were detected in sample MW-1 at concentrations ranging from <br /> 22 ug/1 of toluene to 2,862 ug/l of xylenes <br /> No other target analytes were detected in the samples analyzed Analytical results of the monitoring <br /> well ground water samples are summarized in Tables 2 and 3 The laboratory reports (CTEL I D <br /> CT214-0403113), quality assurance and quality control and chain-of-custody forms are presented <br /> in Appendix C <br /> 4.0. CONCLUSIONS <br /> The findings from the March 2004 ground water monitoring event are as follows <br /> • Ground water flow direction at the water table was towards the east to northeast at a gradient <br /> of 0 009 ft/ft The ground water elevation at the site has increased 1 2 feet between October <br /> 2003 and March 2004 <br /> • TPH-g was detected in ground water sample from well MW-1 at a concentration of <br /> 9,1000 µg/1 The BTEX compounds benzene(370 µg/1), ethylbenzene (990 µg/1) and total <br /> xylenes (2,862 µg/1) in sample MWA were significantly above the DHS's Maximum <br /> Contaminant Levels established for these compounds in drinking water <br /> • The extent of TPH and BTEX compounds has not been defined <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings of this Investigations, AGE recommends <br /> • Continued quarterly monitoring of the site, the next monitoring event is scheduled for June <br /> 2004 <br /> • Additional assessment of the lateral and vertical extent of hydrocarbon-impacted soil and <br /> ground water in the vicinity of the former dispensers, and in the City of Stockton Right of <br /> Way east of the site <br /> • Once the impact to soil and ground water impact has been delineated, a work plan should be <br /> 46 prepared for feasibility testing to evaluate various remedial alternatives at the site <br /> Advanced GcoEnvtronmental,Inc <br />