FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

Mr. Harlin Knoll cject 20939-011.001 April 8, 1998 Page 2 Boreholes will be advanced to approximately 14 feet below ground surface (bgs). The anticipated depth to groundwater is approximately 5 feet bgs. Boreholes will be continuously sampled to provide a detailed analysis of subsurface conditions including soil types and potential impacts. EMCON personnel will prepare boring logs from samples and field screen soil samples for a preliminary determination of impacts. Up to two soil samples will be submitted for laboratory analysis based on field observations and field screening results. We anticipate one of the samples analyzed will from near the bottom of the boring, 12 to 14 feet bgs, where impacted soil was previou ly encountered. Up to two groundwater samples will be collected from boreholes nearest and farthest from the potential source area, with one groundwater sample collected from near the surface of first-encountered groundwater, and one sample collected from rear the bottom of the boring. All drilling and sampling tools will be cleaned between sampling locations. Drill cuttings and decontamination water will be placed in DOT-rated steel drunv, then staged at the site for future disposal. The soil borings will be backfilled from the bottom to the surface with a neat cement grout. Task 3 - Laboratory Analyses The soil and groundwater samples collected from the explorato y soil borings will be submitted to a state-approved analytical laboratory and analyred for the following parameters: • Total petroleum hydrocarbons (TPH) as gasoline using Ej ivironmental Protection Agency (EPA) Method 8015M • TPH as diesel or motor oil using EPA Method 8015M with silica gel cleanup preparation) • Benzene, toluene, ethylbenzene, and total xylenes (B X) and methyl-tert- butylether(MTBE) using EPA Method 8020 • Chlorinated solvents using EPA Method 8010 • Total lead using EPA Method 7420 SAON.-TJM39\093901 10.1 AS-Wpwsmer.3