Laserfiche WebLink
3.1.1 Soil Samp&ng <br /> Drilling was conducted by Spectrum Exploration, Inc (C57 512289) utilizing a hollow stem <br /> auger drill ng A field geologist continuously logged all drill cuttings and cored soil samples <br /> utilizing the Unified Soil Classification system (Appendix 11) Descriptions of soil types <br /> encountered and sample collection intervals are included on the boring/well logs (Appendix II) <br /> Cored soil samples were collected at five foot intervals using a 2-inch diameter split-spoon <br /> sampler containing three brass tubes The cored samples and drill cuttings were characterized <br /> for soil type, moisture content, and evidence of petroleum contamination (1 a soil discoloration <br /> or petroleum odors) Moreover, a photoiomzation detector (PID) was used as a screening device <br /> ' for the detection of petroleum hydrocarbon vapors in drill cuttings and cored samples Soil <br /> samples were tested with the PID (calibrated daily to an isobutylene standard) by placing a <br /> representative amount of material into a plastic bag and analyzing the headspace after a suitable <br /> period Soil samples collected at the water table interface were submitted for laboratory <br /> ' analysis Due to transportation difficulties, the samples were held past acceptable holding times <br /> and therefore could not be analyzed Field PID measurements, providing a rough estimation of <br /> soil contamination, are summarized in Table 2 <br /> 3.1.2 Monitoring Well Construction <br /> Soil Bonngs MWI, MW2, and MW3 were subsequently completed as groundwater monitoring <br /> wells The monitoring wells were installed to assess the extent of groundwater contamination <br /> beneath the site, and to provide measurement points for the determination of groundwater flow <br /> ' direction and hydraulic gradient Figure 2 shows the locations of the wells. <br /> Each well was constructed with 2-inch F480 polyvinyl chloride (PVC) casing The screened <br /> interval of each well was positioned from approximately five feet above to fifteen feet below the <br /> ' encountered water table to allow for seasonal water level fluctuations The screen slot size is <br /> 0 01 inch <br /> 1 <br /> The boring for each monitoring well was advanced with 8-inch outside diameter hollow stem <br /> augers When the augers were advanced to the desired depth of the well, the well casing was <br /> lowered down the center of the augers and set to the appropriate depth The annular space <br /> GPR1227 JPi. 3 <br />