ARCHIVED REPORTS XR0010918 - Laserfiche WebLink

Home Browse Search

McDowell&Davis Towing Geoprobe Soil Boring&Revised Risk Assessment and Conceptual Site Model Report Page: 3 i Table of Laboratory Sample Results (8106/03) Sample I.D. Gasoline Benzene Toluene E-Benzene Xylenes MTBE m /Kp,/Kg ligfKg B-5-5' <1.0 <5.0 <5.0 <5.0 <5.0 <10 B-5-10' <1.0 <5.0 <5.0 <5.0 <5.0 <10 B-5-15' <1.0 <5.0 <5.0 <5.0 <5.0 <10 B-5-20' <1.0 <5.0 <5.0 <5.0 <5.0 <10 B-5-25' <1.0 <5.0 <5.0 <5.0 <5.0 <10 B-5-30' <1.0 <5.0 <5.0 <5.0 <5.0 <10 Gasoline by Method 5030/Luft BTEX&MTBE by Method 8260E 2.1 Drilling The soil boring was accomplished using a mobile mounted Geoprobe® Systems drilling rig, Model 5400, employing the use of a 1.25" hollow probe rods. All drilling equipment was thoroughly steam cleaned before drilling began to prevent the introduction of contamination from off site, and between borings to prevent cross contamination. The boring was togged under the direct supervision of a registered geologist using the Unified Soil Classification System. The color, texture, moisture, plasticity (if applicable), consistency of the earth materials, pertinent soil or bedrock characteristics and an evidence of contamination will be noted. All water-bearing g zones and the depths at which they are encountered are noted on these logs. The boring was drilled in such a manner as to prevent cross contamination between strata. Water samples were taken at the soil/groundwater interface, and the borings were then terminated with a cement mixture. 1 r 2.2 Soil Sampling All soil sampling equipment was thoroughly steam cleaned before and between sampling to prevent cross contamination. Relatively undisturbed soil samples were taken at intervals of not more than five feet (5) in order to evaluate the subsurface materials. The soil samples were obtained using a Geoprobe® core sampler with plastic liners. The sampler was pushed (Direct Push Technology) continuously by the hydraulically powered, percussion system. The laboratory samples did not have headspace and were immediately sealed in their liners using plastic caps. The remaining sample was removed from its liner to be used as an aide to the on-site geologist in logging the material at that depth.