FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

kTI KLEINFELDER V �. 3 GROUND WATER ASSESSMENT Three ground water monitoring wells were installed at the TCMH on March 15 through March 17, 1989. The wells were subsequently sampled on March 23, 1989. This report describes the field activities and analytical results of the ground water investigation. 3.1 DRILLINGTkOC ES �.• Fou soil borings MW-1, MW-2, MW-3, and B-8, were drilled around the rea of the pre Mous excavation. Boring B-8 was intended to be the location for MW- , however, ap arent soil contamination, possibly associated with a gasoline tank (cur ently being pe mitted for closure) in close proximity to B-8,was encountered and the�b ing was closed Lo S by t mie grouting. The location of MW-2 was then repositioned. "ee Plate 2 for the Monitor' Well Location Map. LA The borings were drilled with a truck-mounted drill rig equipped with 8-inch hollow-stem augers. All soil cuttings produced during drilling were contained in 55-gallon drums. Each drum was labeled, denoting which boring cuttings it contains, and stored onsite for disposal by the owner. Each boring was continuously cored for logging purposes. During drilling, �,. an experienced environmental geologist classified the soil, logged the boreholes, and collected soil samples for laboratory analysis. To reduce the potential for cross-contamination, augers and associated equipment were steam cleaned prior to the drilling of each boring. In addition, sampling equipment was y cleaned with a trisodium phosphate wash and rinsed with distilled water prior to the collection of each soil sample. Soil samples were collected approximately every 5 feet for field screening, lithologic logging, and potential chemical analysis. Samples were collected by advancing the boring to a point immediately above the desired sampling depth and then driving a Modified La California Sampler, lined with three brass tubes, into the undisturbed soil. The sampler was then removed from the bottom of the boring. The potential contaminants included La volatile or semivolatile organic constituents, therefore, the bottom (third) tube was sealed with Teflon sheets and tight-fitting plastic caps. The sealed tube was immediately stored in 175-89-543 3 LN