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w Ripona Market Vertical Groundwater Investigation&November 2003 Quarterly Report Page: 8 i The analytical laboratory reported groundwater contamination by MTBE 1 in (1960 u� ) well MW-2, located at the edge of the tank basin. MTBE groundwater contamination for the November 26, 2003 /December 8, 2003 events are presented in Figure 6. Laborato Groundwater Sam le Results Petroleum Compounds 11-26-031 12-8-03 Sample I.D. Date Gasoline Benzene Toluene E-Benzene Xylenes MTBE t-Butanol TAME MW-1 11/26/03 <0.05 <0.3 <0.3 <0.3 <0.6 <0.5 <5 <0.5 MW-2 11/26/03 70.05 <30 <30 <30 <60 1960 <50 <5 MW-3 11/26/03 <0.05 <0.3 <0.3 <0.3 <0.6 <0.5 <5 <0.5 MW-4 12/8103 <0.05 <0.3 1 <0.3 L <0.3 1 <0.6 0:9== <6 <0.5 ND=Non Detect NA=Not Analyzed Mg/L for gasoline&Dissolved Oxygen µg/L for BTEX,MTBE,and 8260 Oxygenated Compounds 2.1 Drilling Permits were obtained as necessary for all borings before drilling began. The soil 1 boring was accomplished using a mobile mounted drilling rig employing the use of 10-inch� and 8-718-inch o.d hollow stem flight augers. All drilling equipment 7- was thoroughly steam-cleaned before drilling began, to prevent the introduction i of contamination from off site, and between borings to prevent cross contamination. The borings were logged under the direct supervision of a registered professional using the Unified Soil Classification System. The color, texture, moisture, plasticity (if applicable), consistency of the earth materials, pertinent soil or bedrock characteristics, and any evidence of contamination will be noted. All water-bearing zones and the depths at which they were encountered are noted on these logs. The boring was drilled using a conductor casing to seal off the upper strata to prevent cross contamination between strata. Upon termination, the boring was completed as a deep monitoring well w'th a� fii to--foot screen and backfilled with �- concrete grout, after a Bentonite seal ha�been placed. The cuttings from the drilling operation were containerized on-site during drilling for proper disposition. The proper method of disposal will be dependent upon results of laboratory analysis. This disposal will be the responsibility of the client unless other arrangements are made. 2.2 Soil Sampling ! All soil sampling equipment was thoroughly steam-cleaned before and between sampling to prevent cross contamination. Relatively undisturbed soil samples y • were taken at intervals of not more than 5 feet in order to evaluate the subsurface materials.