SAMPLE COLLECTION METHODS AND RATIONALE Sample Clauses
The "Sample Collection Methods and Rationale" clause defines the procedures and reasoning behind how samples are gathered for a particular purpose, such as testing, analysis, or quality control. It typically outlines the specific techniques, equipment, and protocols to be used during collection, and may explain why these methods are appropriate for the intended analysis or regulatory requirements. By clearly specifying both the methods and the rationale, this clause ensures consistency, reliability, and scientific validity in the sampling process, thereby reducing ambiguity and supporting the credibility of the results.
SAMPLE COLLECTION METHODS AND RATIONALE. In order to obtain more information about the occurrence of TCE in shallow groundwater at the Site, DEQ conducted a Preliminary Assessment from April 14 - 18, 2003. DEQ followed the EPA-approved Sampling and Quality Assurance Plan (SQAP) dated February 14, 2003 during the Site investigation. DEQ drilled 11 soil borings, using a push probe to evaluate the nature and extent of solvent contamination at the Site. Soil samples were collected in polyvinyl acetate liners. Each soil boring was logged by a registered geologist. The soil boring logs document the boring identification, date, location, geologist, total depth, and soil description. Once the desired borehole depth was reached, a non-dedicated temporary well point was installed, and a groundwater sample was collected. Using EPA funds under the cooperative agreement, DEQ collected 11 groundwater samples from the Linn Gravels (deeper water bearing zone) and two soil samples from the Willamette Silts (shallow water bearing zone). Using state funds, DEQ collected two groundwater samples from the Willamette Silts, six soil samples from the Willamette Silts, and eight groundwater samples from residential ▇▇▇▇▇ (deeper water bearing zone). The rationale for each sample location, shown in Figure 2, is listed below: Boring SB1in the right-of-way on ▇▇▇▇▇ Avenue was located the closest to documented releases of petroleum products and solvents from City Industrial Center, former Chevron Bulk Plant, and Evanite Products. Boring SB2 in the right-of-way on ▇▇▇▇▇ Avenue was located north of the ▇▇▇▇▇▇ County vehicle maintenance shop. Boring SB3 in the right-of-way on ▇▇▇▇▇ Avenue was located north of the ▇▇▇▇▇▇ County Shops. Borings SB4 through SB6 in the right-of-way on ▇▇▇▇▇ Street were located east of the residential ▇▇▇▇▇ with the highest TCE concentrations. Boring SB7 in the right-of-way on ▇▇▇▇▇▇▇ Avenue was located southwest of the ▇▇▇▇▇▇ County Shops’ hazardous waste storage area and WPRR railroad. Boring SB8 in the right-of-way on ▇▇▇▇▇▇▇ Avenue was located south of the ▇▇▇▇▇▇ County Shops along the drainage ditch where wash-rack water was discharged from the ▇▇▇▇▇▇ County Shops and near the former ▇▇▇▇▇ Mining Site. Boring SB9 in Avery Park was located west of the residential well (1440 ▇▇▇▇▇) with the highest TCE concentration. Boring SB10 on ▇▇▇▇▇▇ County’s property was located east of the ▇▇▇▇▇▇ County Shops’ hazardous waste storage facility. Boring SB11 on ▇▇▇▇▇▇ County’s property was located near the ref...
SAMPLE COLLECTION METHODS AND RATIONALE. A focused soil and groundwater assessment was conducted on the ▇▇▇▇▇▇‟s Cleaning Center Site to attempt to identify the source of PCE and other solvent contamination previously found in downgradient ▇▇▇▇▇ and to attempt to assess the potential for exposure to hazardous substances in soil, groundwater, or air at the Weldon‟s site. DEQ collected 6 soil samples, 4 groundwater samples, and 3 soil gas samples from the ▇▇▇▇▇▇‟s site to provide a basic assessment of on-site contamination.
SAMPLE COLLECTION METHODS AND RATIONALE. In order to obtain more information about the occurrence of PCE in shallow groundwater at the site, DEQ collected samples from June 2 through June 4, 2008. DEQ followed our EPA-approved Sampling and Quality Assurance Plan (SQAP) dated August 10, 2004 during this investigation. DEQ drilled 13 soil borings (SB-1 through SB-12 and SB- 14), using a push probe to evaluate the nature and extent of solvent contamination at the site. Each soil boring was logged by a registered geologist. The soil boring logs document the boring identification, date, location, geologist, total depth, and soil description. Once the desired borehole depth was reached, a non-dedicated temporary well point was installed, and a groundwater sample was collected after purging about 1 liter of water. Groundwater was purged and sampled using a mechanical bladder pump. Soil samples were also collected during the drilling of selected boreholes. Groundwater was also collected from seven residential domestic or irrigation ▇▇▇▇▇ in the area of the PCE plume Groundwater samples were collected from borings SB1, SB2, and SB3 at ▇▇▇▇▇▇▇▇’▇ Property at the locations shown on Figure 2. The borings were completed to evaluate possible releases from the former dry cleaner. SB1 was collected in the Northwest part of the parking lot near the NW corner of the building, SB2 was collected in the Southwest part of the parking lot, and SB3 was collected in the Eastern part of the parking lot southeast of the building. Soil samples from the borings were screened with a PID during drilling and several soil samples were collected for laboratory chemical analysis to help evaluate if this site is a likely PCE source. Shallow groundwater and soil samples were collected soil borings SB4 through SB12 at the locations shown on Figure 2. The borings were completed in the neighborhood between River Road and Rivercrest Avenue to determine the extent of the impacts to shallow groundwater. This work included:
1. Collecting soil and groundwater samples from the northeast corner of the intersection of Birch and Manbrin streets (SB4).
SAMPLE COLLECTION METHODS AND RATIONALE. On February 7, 2001, DEQ excavated seven test pits. Sample locations were originally proposed to be collected beneath the landfill in the native soil. Once the matrix of the landfill material was determined to be primarily soil, DEQ altered the sampling program to collect soil samples from the landfill fill material as well as from beneath the landfill. Four soil samples collected from test pits TP-1, TP2, TP-4, and TP-6 were collected from the fill material. Two on-site soil samples from test pits TP-3 and TP-5 and the background sample collected from test pit TP-7 was collected from the native soil. The sample locations were selected to delineate the vertical and horizontal extent of the landfill. The samples were analyzed for volatile organic compounds (VOCs), semi-volatile organic compounds (SVOCs), metals, pesticides, and PCBs. DEQ followed the EPA-approved Sampling and Quality Assurance Plan (SQAP) dated January 26, 2001 during the site investigation. A backhoe was used to excavate test pits and to collect soil samples. A summary of sampling methods is included in Appendix B. Each test pit was logged by a registered geologist. Test pit logs are presented in Appendix C. The test pit logs document the test pit identification, date, location, geologist, total depth, and soil description. A sample key is provided as Table 1. The sample key documents all samples collected at the site. The sample key provides a cross reference between the sample location, sample depth, the EPA regional sample number, as well as the matrix, and date collected. Test pit locations are presented in Figure 4. A photograph log of sampling activities is presented in Appendix D.