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, 1 <br /> I <br /> I Y <br /> 29 August' 2001 r <br /> • �' AGE-NC Project No 95-0144 ' <br /> Page 6 of 7 <br /> ` wells completed beneath the clay layer {approximately 35-45 'feet bsg}were lower than in <br /> wells completed within first ground water <br /> S <br /> • Petroleum hydrocarbons were detected m four of the ten wells sampled during the May 2001 <br /> monitoring event Concentrations of TPH-g Increased substantially m MW-21A and have <br /> increased slightly in monitoring well MW-21B since the February 2001 monitoring <br /> event Concentrations of TPH-d have decreased slightly in monitoring wells MW-20A and <br /> MW-2 IA and slightly Increased in monitoring wells MW-19A and MW-21B since the last <br /> ` quarterly monitoring event TPH-mo has decreased In monitoring well MW-2IA, the only _ <br /> well that contained detectable concentrations of the analyte during the May 2001 monitoring <br /> ' event <br /> • TPH-g was detected in wells MW-21A and MW-21 B located within the former UST No 8 <br /> ' pit The extent of'ground'water impacted by TPH-g is luted to the area immediately <br /> surrounding the former UST No 8 <br /> • The plume of ground water impacted by TPH-d is larger than the TPH-g plume, extending ' <br /> just south of MW-19 and north of MW-20 {{ <br /> ,I <br /> ' . • MTBE was not detected in ground water samples collected from the site Based on its <br /> sporadic detection and low concentrations, the impact of MTBE on the site is believed to be „ <br /> i <br /> minunal <br /> • Approximately 116 tons of contaminated soil generated during overexcavatYon of the former w� <br /> UST No 1 pit was disposed of at Forward Landfill in Manteca, California The disposed soil <br /> x contained approximately 105 pounds of petroleum hydrocarbons including TPH-g, TPH-d <br /> and TPH-mo <br /> n <br /> L <br /> e ` ' <br /> ,1 <br /> 5.0. RECOMMENDATIONS <br /> Based upon data obtained during the first quarter of 2001 and previous sampling events, AGE <br /> recommends <br /> I <br /> ' Continued quarterly monitoring of the site The next quarterly monitoring event should be <br /> scheduled for August 2001, concurrent with monitoring at the Van Buren site <br /> r = i <br /> Preparation of a work plan for a ground water pump and treat system,to be utilized at the <br /> former UST No 8 location An 8-hour aquifer pumping test was performed at the site on <br /> 24 May 2001 A report documenting the procedures and results is in preparation <br /> I , <br /> I <br /> r <br /> 4 <br /> Advanced GeaEnvironmental,Inc <br /> i u <br /> I <br /> x 1 r <br /> F { 1 Y <br />