FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

Upon recovery, a portion of the soil sample is placed into a plastic bag and sealed for later screening with a photoionization detector(PID). Another portion of the soil sample is used for classification and description. That part of the soil sample collected in the leading brass tube within the California-type sampler is stored at approximately 4°C for transport to the laboratory. 1.4 Soil Classification As the samples are obtained in the field, they are classified by the geologist in accordance with the Unified Soil Classification System (USCS), Visual/Manual Method. Representative portions of the samples are then retained for further examination and for verification of the field classification. Logs of the borings indicating the depth and identification of the various strata,the N value,and pertinent information regarding the method of maintaining and advancing the borehole are made. 1.5 Soil Sample Screening/hNu Portable Photoionization Detector Method After the soil sample plastic bags are brought to ambient temperature,the headspace vapors of the soil sample in the bag are screened with a PID equipped with a 10.2 eV lamp. The sample corner of the bag is opened and the detector probe immediately placed within the headspace. The highest observed reading is recorded. 2.0 ANALYTICAL PROCEDURES Selected soil samples submitted to the laboratory are analyzed for benzene, toluene, ethylbenzene, total xylenes, total petroleum hydrocarbons in the gasoline range using USEPA Method 8260B. Also, the soil samples were analyzed for the oxygenates methyl tertiary butyl ether, tertiary butyl alcohol, tertiary amyl methyl ether,di-isopropyl ether,and ethyl tertiary butyl ether using USEPA Method 8260B. 3.0 QUALITY ASSURANCE PLAN This section describes the field and analytical procedures to be followed throughout the investigation. 3.1 General Sample Collection and Handline Procedures Proper collection and handling are essential to ensure the quality of a sample. Each sample is collected in a suitable container,preserved correctly for the intended analysis,and stored prior to analysis for no longer than the maximum allowable holding time. Details on the procedures for collection and handling of soil samples used on this project can be found in Section 1.0(Methods).