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uik February 10 1992 Q Stop Market No. 120 ary , Project No. 3-49120-31 Page 3 Summary of Analytical Results Laboratory analysis did not reveal any TPHD, TPHG, or BTEX components in any of the December groundwater samples submitted for analysis. The results from the December 18, 1991 laboratory analysis were reported as follows Ethyl Well Benzene Toluene Benzene Xylenes TPHG TPHD MW-1 <0 5 <0.5 <0.5 <0.5 <50 <100 MW-2 <0.5 <0.5 <0.5 <0.5 <50 <100 ' MW-3 <0.5 <0 5 <0.5 <0.5 <50 <100 Results m parts per billion(jig/L) ' <0 5 Not detected at or above hsted practical quanptation hmit for the method Discussion ' Groundwater in the monitoring wells at the site was measured on September 11, 1991 at depths ranging from 44 68 to 45.62 feet below the existing ground surface. These depths correspond to elevations of 33.40 to 33 60 feet below mean sea level based upon available survey data. The apparent groundwater surface rose between 1.40 feet to 1.421 feet since the previous sampling. Groundwater contours show a gently inclined ' groundwater surface with a predominant flow direction to the east at a gradient of approximately 0 0020 The December 1991 analytical results revealed that no petroleum hydrocarbons have been detected in any of the groundwater monitoring wells. This is the fourth consecutive quarter of nondetectable results at this site ' The next quarterly groundwater sampling at the site will be conducted in March 1992. P g Recommendations TPHD, TPHG or BTEX has not been detected in any of the on-site wells for the past ' four quarters. In compliance with the LUFT Manual guide lines, it is the recommendation at RESNA that Quik Stop be permitted to discontinue quarterly monitoring of this location and begin semi-annual sampling for a period at one year If TPHD, TPHG or BTEX are not detected in these two samplings, Quilt Stop should be permitted to discontinue sampling at this site.