REP16790 - Laserfiche WebLink

Home Browse Search

1 transport to the laboratory. Chain-of-custody records and sample collection records were maintained to document sample collection, handling, and management. The following provides a summary of each sample collected. Sample collection data sheets are attached in Appendix A. Table 1: Shallow Soil Sample Collection Summary Sample No. De th How Collected Descri lion S-1 12" Shovel to 12", approx. 12" Light brown gravelly sand with large diameter hole, hand trowel to cobbles, degraded asphalt pavement obtain sample at that depth about 3" below ground surface. Stron odor S-2 12"-16" Shovel used to remove top Reddish brown sandy gravel that several inches. Hand auger appears to be fill material. Weak used to collect sample. odor at ground surface, no odor from sam le S-3 8"-12" Shovel used to remove Medium brown, silty, fine to medium compacted sand and gravel. grained sand, no odor. The ground Hand auger used to collect surface is compacted sand and sam le. ravel. S-4 0"-1" Shovel used to clear burned Sifty sand, discolored by fire, odor. debris, scrape down to native soil, sample collected with hand trowel S-5 3"-6" Ground frozen, used shovel to Dark brown silty sand, frozen scra a and collect sam le ' 2.2 Borehole Drilling and Sampling t 1 L~ 1 Five soil borings were drilled and sampled to identify subsurface lithologies, obtain samples for laboratory analyses, and to identify the saturated zone or water table. The locations of the boreholes are shown in Figure 1. Because the boreholes were to be completed as monitoring wells, the rationale for their locations was largely to evaluate the presence of contaminants near the property boundaries (MW-1AS, MW-2AS, MW- 3AS) and to measure the concentration of contaminants in areas suspected of being contaminated (MW-4AS and MW-5AS). The soil borings were drilled and sampled using hollow-stem auger drilling techniques following ASTM Method D1586, Standard Test Method for Penetration Test and Split- Barre/ Sampling of Soils. Alluvium samples were obtained using split barrel samplers. Despite using basket-type sample catchers, sample recoveries were generally poor. The alluvium is largely a loose, gravelly sand with a significant amount of cobbles. The samplers appeared to either push material aside or ahead, got plugged with gravels, or penetration was stopped by the cobbles. Large diameter sampling barrels (three inch inside diameter) fared no better than the standard split spoons. Several samples required compositing over a longer sample interval than planned to provide enough material to fill the sample jars. 22314-0001: 02/21 /00 Q