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Qo4gicaf7echtaatac. Page 6 Groundwater Monitoring Report Project No. 1030.2 March 18,2005 2.3 Analytical Results ' Laboratory results, completed on January 25, 2005 indicate the following: • MW-1 has low levels of BTEX and TPH-G constituents ' • MW-2, MW-3, MW-4, MW-5 and MW-101 were non-detect above laboratory reporting limits for all analyzed constituents. • The domestic well was non-detect above laboratory reporting limits for all analyzed constituents and has been non-detect since testing began on January 28, 1997. 2,4 Groundwater Parameters Field measurements from the January 17, 2005 sampling event indicate the following: • pH levels recorded in the water table monitoring wells during this event ranged from 6.92 to 7.37. This pH is conducive to maintaining aerobic biodegradation activity. • The average EC recorded in the water table monitoring wells during this event ranged from 2778 to 3210 (Dmhos/cm. ' • The average temperature recorded during this event was 68.8°F. This temperature is conducive to maintaining aerobic biodegradation activity. • Oxidation-reduction potential (ORP) was positive in all monitoring and domestic wells sampled during the January 2005 event. • Measured dissolved oxygen (DO) levels in the water table wells ranged from 0.76 ppm in ' MW-2 to 2.92 ppm in MW-1. DO levels above 1 ppm are conducive to aerobic degradation. A summary of groundwater parameters is included as Table 4. 3.0 CONCLUSIONS AND RECOMMENDATIONS Petroleum H, drocarbons, ' • MW-1, show the presence of BTEX and/or TPH-G constituents. • MW-2, MW-3, MW-4, MW-5, MW-101 and the domestic well were non-detect above Iaboratory reporting limits for all analyzed constituents. ' Site Characteristics • The plume is defined laterally by MW-2 to the southeast, MW-3 to the southwest and MW-5 to the north (all screened from 5 to 20-feet bgs).... • MW-4 appears to be located near the leading edge of the plume. ' • Groundwater slope is gradual, averaging 0.0037,ft/ft, and likely slows down the migration of the plume. 0 The plume is defined vertically by MW-101 (screened from 29.5 to 34.5-feet bgs).