ARCHIVED REPORTS_XR0012640 - Laserfiche WebLink

Home Browse Search

# � r a Mr. Scott Stoner February 11, 1988 Page 2 PROPOSED SCOPE OF WORK The proposed scope of work would involve drilling soil borings, colleci:ing soil samples, and generating soil profiles for indicatinc, the vertical and horizontal extent of the contami- nation in the vadose zone. It is GTI's opinion that the contamination is probably concentrated in a limited area (not laterally extensive) due to the predominance of sandy soils present in the soil column. However, GTI feels it is important to'clearly define the sail as well as the groundwater contamination. The groundwater would be sampled by deepening 3 of the soil borings to a depth of 15-feet below first encountered water (or to 70 Feet, whichever occurs first) . The following -f specific work steps detail GTI's approach:- 0 pproachO Drill grade.8 soil borings to approximately 50-feet below ` o collect soil samples at 5-foot intervals. Five I selected samples from each boring, based on field f inspection will be analyzed for total petroleum hydrocarbons using U.S. Environmental Protection Agency (EPA) Method 418.1.; benzene, toluene, ethyl.benzene, and xylenes (BTEX) and total petroleum hydrocarbons as gasoline using EPA Modified Method 5030/8015/8020; and polynuclear aromatics (PNA's) using EPA Method 8100. o Deepen 3 of the 8 soil borings to approximately 70 feet or to 15-feet below first encountered water (whichever occurs first)'-. --o -----Convert-the-3 deepened borings to monitoring wells by - - - - --- --- installing 2-inch-diameter, 0.020-inch slot, PVC well . screen to 1.5-feet above expected high water level and finish to the surface with blank PVC casing. The annulus of the well will be packed with No. 2 clean- washed Monterey sand to 2--feet above the screened Interval A sanitary seal of bentonite followed by cement grout to the surface will then be installed. GROONAWATPU