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7hmdwe11&Ro110 <br /> • <br /> • Total Metals -EPA 6010A <br /> • Soluble Metals—Cal WET modified with a de-ionized water extraction (STLC DI) <br /> • TPH-gasoline with BTEX- EPA 8020/8015 modified <br /> • TPH-diesel and motor oil - EPA 8015 modified <br /> • Volatile Organic Compounds - EPA 8260 <br /> The analyses chosen for each sample was consistent with the analyses proposed in Table 1 of the <br /> Field Investigation Workplan, and amended with agreement of the DTSC. <br /> All analytical data was subject to quality control review and validation at both the laboratory and <br /> at Treadwell & Rollo. The laboratory data was supplied as an electronic deliverable in EZEDD <br /> format and was input directly into Treadwell &Rollo's EQUIS database. The EQUIS database <br /> allows the laboratory data to be input directly into programs such as Excel, AutoCAD and <br /> • various geoscience and risk assessment modeling programs. <br /> 2.1.4.1 Laboratory Quality Control <br /> If QC accuracy limits with respect to surrogate and matrix spike percent recovery, or precision <br /> limits with respect to relative percent difference were not met during the initial analysis, Curtis & <br /> Tompkins re-analyzed the sample or extract either until the QC limits were achieved, or until it is <br /> apparent that the limits cannot be achieved due to unusual sample conditions or matrix <br /> interference. Curtis & Tompkins' internal laboratory quality control (QC) limits were included <br /> in of the Field Investigation Workplan. <br /> When Curtis & Tompkins could not achieve its internal accuracy and precision QC limits for any <br /> specific sample,they issued a case narrative with the analyses results describing attempts to meet <br /> the limits, and possible explanations for the failure to achieve them. <br /> • <br /> 19 <br /> 25970309.DGD 24 August 2000 <br />