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Nulaid Foods in Ripon 11 i <br /> Subsurface Soil & Groundwater Investigation <br /> boring B-2, which was located in the suspected down gradient direction from the former <br /> tanks. <br /> No petroleum odor or discoloration was noted in any of the soil or groundwater samples. <br /> However, laboratory analysis did disclose low concentrations of diesel in the soil and <br /> diesel, benzene, and toluene in the groundwater obtained from the two borings. <br /> Table of Laboratory Sample Results (August 10, 1999) <br /> Sample I.D. Gasoline Diesel Benzene Toluene E-Benzene Xylenes MTBE <br /> B-1-25' ND 3tt'at ND B- ND ND ND ND <br /> 1-30' ND I(t i ND ND ND ND ND <br /> B-1-30 H2O ND ND #JjtgL 13,3#a L ND ND ND <br /> B-2-25' ND 7.8;' ND ND ND ND ND <br /> 6-2-30' ND 68m 14 ND ND ND ND ND <br /> B-2-34 H2O ND a.% nk 0 U b I ND ND ND <br /> ND=NON-DETECT <br /> 2.1 Drilling <br /> The soil borings were accomplished using a mobile-mounted Geoprobe' Systems <br /> drilling rig, Model 5400, employing the use of a 2.00" hollow probe rods. All <br /> drilling equipment was thoroughly steam cleaned before drilling began to prevent <br /> the introduction of contamination from off site, and between borings to prevent <br /> cross contamination. <br /> The borings were logged under the direct supervision of a registered geologist using <br /> the Unified Soil Classification System. The color, texture, moisture, plasticity (if <br /> applicable), consistency of the earth materials, pertinent soil or bedrock <br /> characteristics, and any evidence of contamination will be noted. All water-bearing <br /> zones and the depths at which they are encountered are noted on these logs. <br /> All borings were drilled in such a manner as to prevent cross contamination <br /> between strata. Water samples were taken at the soil/groundwater interface, and the <br /> borings were then be terminated with a cement mixture. <br /> 2.2 Soil Sampling <br /> All soil sampling equipment was thoroughly steam cleaned before and between <br /> sampling to prevent cross contamination. Relatively undisturbed soil samples were <br /> taken at intervals of not more than five feet (5') in order to evaluate the subsurface <br /> materials. <br /> The soil samples were obtained using a Geoprobe' core sampler with plastic liners. <br /> The sampler was pushed (Direct Push Technology) continuously by the <br /> hydraulically powered, percussion system. <br /> 2 <br />