Soil Sampling. Soil cores were collected continuously from the upper portions of each boring. Soil was collected in 4- foot long Geoprobe polyethylene liners installed in the push rods. Each liner was retrieved after the rods were advanced approximately four feet. Each liner was cut open upon retrieval. The soil column was logged under the supervision of an Oregon Registered Geologist and the soil was screened for the presence of VOCs using a photo ionizing detector (PID) fitted with a 10.6 eV lamp and calibrated to isobutylene. The surface of the soil inside the liners was initially screened with the PID. Soil samples for laboratory chemical analysis were collected from undisturbed portions of the soil cores. Soil selected for chemical analysis was transferred from the acetate liner into laboratory-prepared VOA vials with appropriate reagents using a disposable 5ml syringe as directed in EPA method 5035 (8). Adjacent soil was collected in 4-ounce jars supplied by the analytical laboratory for determination of soil moisture content. The soil was transferred to the jars by hand using new clean nitrile gloves. The soil samples were assigned a number designated as „SL‟ followed by the boring number, followed by sampled depth. For example, sample „SL-SB1-3.0‟ was collected from boring 1 from 3 feet bgs The soil was also observed for signs of staining and chemical odors while collecting geological information for logging. Results of the field screening were recorded on the field boring logs along with soil lithology and groundwater conditions. Attempts were made to collect soil samples for chemical analysis from areas where PID readings were elevated. Copies of the boring logs are included in Appendix B. Soil sampling focused on the unsaturated zone, intentionally avoiding sampling from beneath the water table. Sampling at this depth would most likely encounter surface spills, land disposal areas or other source areas. The purpose of this approach was to determine if contaminated soil was present that could represent a source area on the ▇▇▇▇▇▇‟s Site. Contaminated soil could ▇▇▇▇▇ to groundwater, contribute to vapor intrusion into on-site buildings, and potentially impact future excavation workers. During field screening, soil in SB-2 and SB-4 showed slight elevations in PID readings (<35 ppm) between 3 and 6 feet below the surface. Elevated PID readings were not observed in any other borings. Besides the petroleum odors observed in the shallow soils at boring SB-4, no staining or odors were observed in site soils. PID readings were used, along with visual observation and odor, in selecting soil samples, to try and identify contamination if present. At least one soil sample was retained from each boring and sent to the analytical laboratory for chemical analysis. At SB-1, sample SL-SB1-3.0 was submitted for analysis. A shallow sample was collected at this boring because it is in an area that was suspected to have past releases, and a deeper sample was not collected because there was no indication of contamination based on field screening. At SB-2 two soil samples SL-SB2-3.0 and SL-SB2-5.0 were submitted for chemical analysis. Slightly elevated PID readings were observed at SB-2, beginning at about 2.5 feet through about 5 feet with a petroleum-like odor. At SB-3, sample SL-SB3-7.0 was submitted for chemical analysis. Field screening did not indicate the presence of contamination above the likely fluctuations of the water table. At SB-4 field slightly elevated PID readings were observed from soil from 4 to 7 feet, with a petroleum- like odor. Sample SL-SB4-4.5 was submitted for chemical analysis. At SB-5 one sample (SL-SB5-6.0) was submitted for chemical analysis, field screening did not suggest any contamination. Six soil samples were collected for chemical analysis. These samples were maintained under chain of custody and shipped to Pace Analytical in Seattle, Washington. The samples were analyzed for VOCs by EPA Method 8260B. The results of the chemical analysis are discussed in Section 2.8.1, below.
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Sources: Preliminary Assessment
Soil Sampling. Soil cores were collected continuously from To further assess soil impacts at the upper facility, H&H proposes to advance soil borings in the following locations: • Four borings will be advanced in the area of floor drains in the portions of each boringthe second floor former chemical storage and mix areas that are located over soil (i.e., not located above the basement). Soil was collected The approximate locations of these borings are indicated in 4- foot long Geoprobe polyethylene liners installed Figure 2. • Three soil borings will be advanced in the basement area where the highest levels of silver have been previously detected. One soil boring will be advanced in the area of previous borings 14A, one will be advanced near previous boring Office B, and one will be advanced near previous boring 1B. • One soil boring will be advanced near the sump in the southwestern corner of the basement area where no previous soil sampling has been performed. An attempt will be made to advance a soil boring in the area of the sump within the basement. However, if a boring cannot be advanced within the basement, a sample will be collected just outside the building using a hand auger. The locations of the initial and alternate borings are indicated in Figure 3. • One soil boring will be advanced in the location of the former wastewater USTs in the southeastern portion of the site. The location of this boring is indicated in Figure 1. The borings will be advanced with a direct push rodstechnology (DPT) rig or stainless steel hand auger depending upon access constraints. Each liner was retrieved after Except for the rods were boring in the area of the wastewater UST, the borings will be advanced to depths of approximately four feet. Each liner was cut open upon retrieval15 ft, which approximates the depths of the previous borings conducted by Terracon. The soil column was logged under boring in the supervision area of an Oregon Registered Geologist and the former wastewater UST will be advanced to a depth of approximately 20 ft because of the depth of the former tankhold in this area. It is anticipated that one soil was screened sample will be collected from each boring for the presence laboratory analysis, although two soil samples may be collected from some borings depending upon field observations. It is anticipated that 10 to 15 soil samples will be submitted for laboratory analysis from potential areas of VOCs using a photo ionizing detector (PID) fitted with a 10.6 eV lamp and calibrated to isobutyleneconcern. The surface depths of the soil inside the liners was initially screened samples submitted for analysis will be based upon field screening with the PID. Soil samples for laboratory chemical analysis were collected from undisturbed portions of the soil cores. Soil selected for chemical analysis was transferred from the acetate liner into laboratory-prepared VOA vials with appropriate reagents using a disposable 5ml syringe as directed in EPA method 5035 (8). Adjacent soil was collected in 4-ounce jars supplied by the analytical laboratory for determination of soil moisture content. The soil was transferred to the jars by hand using new clean nitrile glovesphotoionization detector, and detected odors and staining. The soil samples were assigned a number designated as „SL‟ followed by the boring number, followed by sampled depth. For example, sample „SL-SB1-3.0‟ was collected from boring 1 from 3 feet bgs The soil was also observed for signs of staining and chemical odors while collecting geological information for logging. Results of the field screening were recorded on the field boring logs along with soil lithology and groundwater conditions. Attempts were made to collect soil samples for chemical analysis from areas where PID readings were elevated. Copies of the boring logs are included in Appendix B. Soil sampling focused on the unsaturated zone, intentionally avoiding sampling from beneath the water table. Sampling at this depth would most likely encounter surface spills, land disposal areas or other source areas. The purpose of this approach was to determine if contaminated soil was present that could represent a source area on the ▇▇▇▇▇▇‟s Site. Contaminated soil could ▇▇▇▇▇ to groundwater, contribute to vapor intrusion into on-site buildings, and potentially impact future excavation workers. During field screening, soil in SB-2 and SB-4 showed slight elevations in PID readings (<35 ppm) between 3 and 6 feet below the surface. Elevated PID readings were not observed in any other borings. Besides the petroleum odors observed in the shallow soils at boring SB-4, no staining or odors were observed in site soils. PID readings were used, along with visual observation and odor, in selecting soil samples, to try and identify contamination if present. At least one soil sample was retained from each boring and sent to the analytical laboratory for chemical analysis. At SB-1, sample SL-SB1-3.0 was submitted for analysis. A shallow sample was collected at this boring because it is in an area that was suspected to have past releases, and a deeper sample was not collected because there was no indication of contamination based on field screening. At SB-2 two soil samples SL-SB2-3.0 and SL-SB2-5.0 were submitted for chemical analysis. Slightly elevated PID readings were observed at SB-2, beginning at about 2.5 feet through about 5 feet with a petroleum-like odor. At SB-3, sample SL-SB3-7.0 was submitted for chemical analysis. Field screening did not indicate the presence of contamination above the likely fluctuations of the water table. At SB-4 field slightly elevated PID readings were observed from soil from 4 to 7 feet, with a petroleum- like odor. Sample SL-SB4-4.5 was submitted for chemical analysis. At SB-5 one sample (SL-SB5-6.0) was submitted for chemical analysis, field screening did not suggest any contamination. Six soil samples were collected for chemical analysis. These samples were maintained under chain of custody and shipped to Pace Analytical in Seattle, Washington. The samples were will be analyzed for VOCs volatile organic compounds (VOCs) by EPA Method 8260B. The results 8260, and the hazardous substance list (HSL) metals (antimony, arsenic, beryllium, cadmium, chromium, copper, lead, manganese, mercury, nickel, selenium, silver, thallium, and zinc). In addition, to assess background concentrations of metals in soil, up to three soil samples will be collected from background locations for analysis of the chemical analysis HSL metals. The soil samples will be collected from similar depths as the samples collected from potential areas of concern. Approximate locations for the background samples are discussed identified in Section 2.8.1Figure 1. Soil borings will be grouted after completion. Soil cuttings generated during the sampling and well installation activities will be containerized, belowsampled for disposal purposes, and then shipped off-site to a permitted facility.
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