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Working To Restore Nature Depth to water has ranged from 70 35 to 75 26 feet in well MW-1 and the facility well water level has been measured betweem 73 77 and 78 70 feet below grade A summary of the groundwater monitoring data is presented in Table 3 ' OBJECTIVES AND SCOPE OF WORK The objectives of this investigation were to establish a site specific gradient direction and magnitude and to further define the impact to soil and groundwater from the contamination associated with the abandoned 3500 gallon underground storage tank located beneath the southeast corner of the maintenance/office building 1 To achieve the above objectives the following scope of work was executed ' o One boring was drilled to approximately 87 feet below grade, 35 feet southwest of the tank location (Plate 4) and completed as a monitoring well (MW-2) to further assess the lateral extent of soil and groundwater contamination and to provide additional ' groundwater elevation data for gradient magnitude and direction calculations O Two soil samples were collected for analysis for BTEX/TPHg, one of which was collected from the soil/groundwater interface o The new well was monitored, surveyed, developed, purged and sampled The collected ' groundwater sample was submitted for laboratory analyses for BTEX and TPHg O The facility well was also surveyed and monitored, tying the data into the survey data ifrom the new well and the existing well to calculate gradient direction and magnitude Methodology On July 27, 1994, RESNA drilled one soil boring which was completed as a groundwater monitoring well The boring was drilled by Spectrum Exploration, Inc , license no 51228, using a hollow stem auger ng A field geologist was present to log all drill cuttings and soil ' samples utilizing the Unified Soil Classification System Descriptions of soil types encountered, sample collection intervals and well construction details were recorded on the well log included in Appendix I ' The boring was advanced to 87 feet below surface grade, 15 feet below the water table, and completed as a groundwater monitoring well Cored soil samples were collected for lithologic description above the water table at 5 foot intervals and below the water table at selected M 11500661REPORTSISR-0894 FNL 4 t