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09 May 2005 . . AGE-NC.ProjectNo_ 98-0440 =< Page 3 of 4- 3.2. -3.2. ANALYTICAL RESULTS-OF GROUND WATER SAMPLES TPH-g was detected in,the ground Water°samples collected from wells MW-2-and .MW-5 at a maximum concentration of 78 micrograms-per-liter(µg71).TPH-d..was detected,in the ground water ' s samples collected from wells MW-2-and`IVIW-6 at`concentrations of 1000 µg71 and 160 µg/1,;.= - respectively. A map showing the approximate°ekteni of=dissolved TPH-g is shown on Figure 4: Benzene was detected in the ground water sample collected from well MW-5 at-a-concentrations of 1.4µg71.A map showing the approximate extent of dissolved benzene is shown on,Figure 5.Toluene r , was detected in the ground water samples co:1kcte.from,�vells MW-2 and MW-5'at concentrations of i.9 g/l and 1.$µg/l,respectively.Xylene was detected iri the,ground water sample collected from' , well MW-2 at a.concentration of 0.55 µg/l.No.other analytes were.detected at or above laboratory -j reporting limits in the ground watersamples-collected,from-the.rerriainingwells and domestic water : wells on- and off=site.. y Current and previous analytical.results are summarized in Table 3:The laboratory report(MAI Work Order 05,03506), quality assurance7quality control (QA7QC)report and chain of custody.forms are included in Appendix D. r r Fp 4.0. SUMMARY AND CONCLUSIONS Based on•_the data collected during this monitoring period;AGE concludes: m Ground waterelevaiions at the site ranged'from 26.00-feet above MSL in well MW-12.to 27.13 feet above MSL in well-MW-1.Ground watenkvels were within the screened intervals _ } 7 of all the monitoring wells=on-site. The ground_water at the site was inferred to be flowing toward the.north-northwest,.away-6oinythe former UST area,tinder an average gradient of-_ 0.007'ft/ft;- which is .consistent with:the; flow direction determined during previous -monitoring events: TPH-g was detected in the groundwater samples collecied.from' wells MW-2 and'MW-5 at w a maximum'concentration of.78 lig/l. TPH-d 'was"detected in the ground water samples. " z collected -from.wells MW-2 and MW-66at -concentrations-of_1,000 µg71 and 160 µg11;` respectively. A neap showing the approximate extent of dissolved TPH-g is shown on Figure 4.. • Benzene was detected in the ground -water sarnple"collected from- well MW-5 ata . concentration of 1.4µg/1. -A map-showing:the approximate.extent-of dissolved benzene is shown on Figure 5. Toluene was detected in the groundwater samples collected from wells MW-2 and MW-5 _--y at concentrations of 1:9 µfill and.1.8 µg71, respectively:Xylene was detected.in Ahe.,ground Adrane d GeoEnvironmental,Inca »—._-r __.-_._ -3_- -_.y_�. r--`�_ a .. __- • - _... ..c ..:� _ 1•W-'• ..ieb..-. _.._..�1_�i-.A w..._.._ ."em�v--:ii'...FaS,.�.-em_._ .t......._.`.- -