FIELD DOCUMENTS_CASE 4 - Laserfiche WebLink

Home Browse Search

Borings were advanced using a Geoprob& Model 5400 equipped with a GH-40 Soil Probing Hammer. Prior to drilling operations, Fisch obtained an "Application for We1llPump Permit" from PHS/EHD to install the soil borings (Appendix A). Drilling and sampling activities were conducted on August 6, in general accordance with procedures described in the Work Plan. The initial boring (B1-1) was drilled to a total depth of 20 feet below ground surface (bgs) and was located approximately 10 feet away from the i northwestern edge of the former tank(Figure 2). Per the Work Plan, continuous-core samples were collected from the initial boring using a 4-foot long, 2-inch diameter, Macro-Core Open Tube Sampler equipped with a clear, polyvinyl chloride (PVC) "plastic liner. Following extraction from the Macro-Core Sampler, core tubes were typically cut in half, capped, labeled and temporarily stored in an ice-cooled chest. A lithologic log was prepared during drilling based on examination of the soil cores and utilizing the Unified Soil Classification System and generally accepted geologic interpretive descriptions (Appendix A). Soil cores were examined { for the presence of staining, discoloration, or odors indicative of petroleum hydrocarbon j contamination. In addition, a photoionization detector (PID) was used to check for the priesence of petroleum hydrocarbon vapors in the open borehole. No indications of petroleum hydrocarbons were noted during drilling of the three borings at the`site. After reviewing the j Iithologic log and PID recordings, Carol Oz of PHS/EHD requested that three soil samples at 8:? 13, and 18 feet bgs be submitted to the laboratory for PHC analysis. 3 LGroundwater was present in the open borehole after the boring had been advanced to about 10 ' feet bgs. A groundwater sample .was collected at this.depth by inserting a 1-inch diameter PIC tube, machine slotted with 0.001-inch diameter openings, from the bottom of the boring to the surface. Prior to collecting the groundwater sample, the depth-to-water wasmeasured using an electric water-level sounder lowered into the PVC tubing. One quarter,inch diameter LTeflon tubing, equipped with a check valve at the submerged end, was then inserted into the slotted PVC tube. Groundwater was brought to the surface within the Teflon tube by moving the Teflon tube up and down in a piston-like motion. jE Two additional borings, B1-2, and B1-3 were drilled to a total depth of 19.0 feet bgs and were located approximately 10 feet south and 10 feet east of the former tank, respectively (Figure 2). At the request of Carol Oz of PHS/EHD, soil samples were collected in each of these borings at depths of 13 and 18 feet bgs for laboratory submittal. Samples were collected using i a"2-foot long, 1-inch diameter, Lange-Bore Soil Sampler equipped with a clear acetate plastic liner. A groundwater sample was collected in each of the two borings at a depth of 12 feet bgs using the method described above. -The three borings were subsequently grouted to the surface with neat cement per PHS/EHD guidelines. 1 3 961171INVRP151S1 USTINV.1tP7' .I� BOYAJIAN & ROSS, INC. Environmental Scientists & Engineers EE