ARCHIVED REPORTS_MONITORING WELL INSTALLATION REPORT - SITE ASSESSMENT WORK PLAN

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' Historical Background:• gr d. River City Petroleum and Connell Motor Lift Truck Page 8 of 13 January 2001 - Installation of Ground Water Monitoring Wells. ' On 24 through 26 January 2001, seven soil borings were established for the collection of soil samples and installation of ground water monitoring wells.Fourteen soil samples collected from the ' monitoring well pilot soil borings were analyzed for TPH-g, TPH-d, BTEX, and fuel additives including MTBE and HVOCs; petroleum hydrocarbons and HVOC's were not detected in the soil ' samples. ' March 2004 - Installation of Soil Vapor Extraction Wells On 26 through 30 April 2004,nineteen separate soil borings were advanced at the sit,utilizing 8.25- ' inch diameter hollow-stem augers to advance borings VW6A through VW 15B.Pilot borings VW6A through VW 15A(shallow wells)were completed as shallow SVE wells,from approximately 10 feet to 30 feet bsg and pilot borings VW6B through VW13B and VW15B (deep well)were completed ' as deep SVE wells screened from approximately 35 feet to 50 feet bsg and vapor well VW14B (deepest vapor well) was completed as a deep SVE well screened from approximately 35 feet to 55 feet bsg. A total of forty-nine soil samples were analyzed for TPH-g,BTEX, five fuel additives ' 0 and lead scavengers EDB and 1,2-DCA; the following is a summary of the significant results: • TPH-g was detected in 34 soil samples collected from borings VW8,VW12 through VW15 ' (over 90%)and not detected in samples from borings VW6,VW7,VW 10 nor V W 11,except for the sample from 50 feet bsg in boring VW6 and 35 feet bsg in boring VW10. The maximum concentration of TPH-g was detected in boring VW15 from 35 feet bsg, at ' 9,400 mg/kg. • Each soil boring with detections, had a set of samples with concentrations greater than ' 1,000 mg/kg collected from either above or beneath 35 feet bsg, except the samples from boring VW12,which had detections above 1,000 mg/kg in both the upper and lower zones. Generally, sand was present above 35 feet bsg and silt was observed below 35 feet, which ' may be the cause of higher concentrations, below the 35 feet bsg division, with low concentrations detected above 35 feet from the same borings. ' • Benzene, toluene, ethylbenzene and total xylenes were detected in the soil samples at maximum concentrations of 58 mg/kg, 230 mg/kg, 71 mg/kg and 360 mg/kg, respectively, in the sample from VW14-45 and 62 mg/kg, 330 mg/kg, 120 mg/kg and 550 mg/kg, ' respectively, in the sample from VW15-45. • TBA was detected in four soil samples with a maximum concentration of 160 micrograms ' per kilogram(µg/kg), in sample VW13-45; all other detections were above 50 gg/kg. • 1,2-DCA was detected in twelve soil samples at a maximum concentration of 810 µg/kg, in sample VW14-55. Advanced GeoEnvironmcntal,Inc.