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z _ r �•. WNW }� V A-y All samples are ct)llcctcd by eNpenenced Brown and Caldwell ficid persolinel, and placed in containers appropriate tri the ruquired an:tiysis. !bass rui)cs used 10 collect suit sautpics are cleaned by washing in laboratory-s,,rade tietzrecnt, rinsing wh with tap water, and rinsing again -kit deionized water. All glass containers have been prccieant•d by the manufacturer or at the analvticai laboratory accordinL ro guidelines established by the G.S. )environmental Protection Agency. Following collection and inspection of soil samples, the cads of tine brass tubes are covered with-aluminum foil and plastic caps and sealed with plastic tape. Groundwater samples ase collected in sampling bottles that have caps with Teflon septa. After tilling, the bottles are visually inspected to ensure that no air bubbles remain within. All samples are labeled and then placed in zip-lock plastic bags. Samples am stored and transported in a closed ice chest and protected from meltwater. Samples are stored for analysis no longer than the maximum allowable holding time. Sample identification and chain-of-custody procedures ensure sample integrity and document sample possession "from the time of collection to uldmate disposal. Each sample container submitted for analysis has a label affixed to identify the project number, sampler, date of collection, sample location, the monitoring-well number (if appropriate), and a number unique to that sample. That information is recorded on the borehole log or in the field records, along with a descri,.cion of the sample,field measurements,sampling methodology,names of sampling personnel, and other pertinent field observations. A standard Brown and Caldwell chain-of-custody form is used to document possession of samples from time of collection to arrival at the laboratory. All samples are submitted to an analytical laboratory that has been certified by the California Department of Healt`t Services. The sample-control offirer at the laboratory verifies sample integrity and confirms that samples were collected in the proper container, preserved correctly, and that there is an adequate volume for analysis. If these conditions are met, the sample is assigned a unique log number by the laboratory for identificadon throughout analysis and reporting. The log number is recorded on the chain-of-custody form and in the legally required log book maintained at the laboratory. The sample description,date received,client's name.,and other relevant information also are recorded SAMPLE HANBLNG Samples are handled during collection and shipment in such a way as to ensure maximum sample quality and integ;iry. All samples are collected by experienced Brown and Caldwell geld personnel. The samples are collected in containers that are appropriate to n're sample tnatcriaI - -- - -- - ----and ehe required analyses.-All containers-have-been precleaned by the analytical laboratoryor the container manufacturer. All sampling equipment is decontaminated prior to and between use by washing in laboratory-grade detergent,rinsing with tap water,and then rinsing with deionized ,vater.