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include maintaining accurate records of the samples analyzed along with the analytical data produced. This involves labeling chromatograms and maintaining the laboratory numbers on subsamples taken from the submitted samples,labeling glassware used in the analyses,and properly labeling sample extract containers with each sample's laboratory number. Following analyses,the samples are transferred to a limited-access storage room. Chain-of-custody forms, chromatograms, and other pertinent information are filed for future reference. Splits of samples analyzed are kept for 30 days. Samples containing hazardous concentrations will be returned to the client for disposal. Standard Operating Procedures for Laboratory Quality Assurance/Quality Control: These laboratory QA/QC procedures were developed to reduce outside interferences during analyses of samples. The laboratory director is responsible for creating and maintaining the program. General QA/QC procedures follow: • Analytical instruments are serviced on a regular basis to assure accurate calibration; • Organic-free water is monitored daily for quality; • Gas chromatographs are calibrated daily; • Method blanks are run to check whether the glassware and reagents are free of interference from chemicals that would invalidate the analyses; • Standards are prepared using the applicable reference materials; • Matrix spikes are analyzed in duplicate to validate the accuracy and precision of the method; and • During groundwater sampling,a travel blank sample consisting of organic-free water is prepared and containerized in the laboratory, transported to the site, and handled and transported in the same manner as the groundwater samples. Standard Operating Procedures for Using Photoionization Detector(PID) and/or Drager® Tubes: The PID is calibrated in accordance with the manufacture's recommendations prior to use in the field. Upon arrival at the proj ect site,the PID is used to monitor background concentrations of organic vapors in the atmosphere at the-site. The--background-concentrations-are measured in a location upwind and removed as possible from sources of organic vapors on the site. When background concentrations of organic vapors register as "0.0" on the PID, subsequent readings of "0.0" registered from samples tested in the field are recorded as "ND" (not detected). When background concentrations of organic vapors register at some quantity above "0.0", subsequent readings registered from samples tested in the field at or below this value are recorded as "B/G" (background).