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3.3 LABORATORY ANALYSES All samples will be analyzed by EPA- or California-approved procedures. The analyses will be carried out by CH2M HILL's laboratory in Redding, California. This laboratory is certified by the State of California to conduct the analyses specified in this work plan. Analytical parameters to be analyzed are based on the requirements of the Tri- Regional Board Staff Recommendations for Preliminary Evaluation and Investigation of Underground Tank Site manual. Samples will be analyzed for the parameters listed in Table 3-1. Groundwater samples will be analyzed for fecal coliform only if monitoring well MW-DIS-1 is within 50 feet of a sanitary sewer line. Sample container preservation and holding time requirements j - are also shown in Table 3-1. As samples are collected in the appropriate containers and labeled, the containers will be placed in ziplock bags and placed in an ice-filled chest or cooler. Water sample bottles will be packaged securely with either bubble wrap or vermiculite to reduce chances of bottle breakage. Ice or blue ice will be placed on top of the samples. All appropriate sample documentation will be placed in a ziplock bag and taped to the inside: lid of the cooler. The cooler will then be sealed with custody seals and strapping I tape. Coolers will be couriered by the CH2M HILL laboratory or shipped via over- night courier (Federal Express or Greyhound) to the analytical laboratory. 3.4 DATA REVIEW AND ANALYSIS Data for all parameters will undergo two levels of review and validation: by the labora- tory and by CH2M HILL. Data will be reviewed according to the guidelines outlined i below and described in detail in Section 4.0. Data will be re ,iewed with regard to the F following: • Analytical methodology • Detection limits • Blanks for contamination • Accuracy and precision -The review process includes flagging data with qualifiers. Commonly used qualifiers include: J W Estimated, usable for limited purposes. The data are qualitatively, but not quantitatively, acceptable. _ R .... Rejected,....unusable;...-The data are qualitatively and quantitatively unac- ceptable. sFo31 WAWPP07.5t 3-6