Laserfiche WebLink
6.0 <br />0 0 <br />2. Immediately after sample collection and labeling, the samples will be sealed in a <br />plastic bag and placed in a sturdy ice chest. The temperature in the ice chest will <br />be maintained at or below 4 °C. <br />3. Soil samples and groundwater samples will be delivered to a State of <br />California -certified chemical analytical laboratory within 48 hours of sampling <br />along with a completed chain -of -custody record. <br />4. Soil samples not selected for laboratory analyses will be placed in iced storage <br />for no fewer than 14 days. <br />QUALITY ASSURANCE/QUALITY CONTROL <br />In order to ensure a successful sampling program, Quality Assurance and Quality Control <br />procedures will be carefully followed. The key points of the Quality Assurance procedures <br />pertain to the submittal of quality assurance samples and document control (decontamination <br />procedures have been previously discussed). <br />6.1 Quality Assurance Samples <br />Quality assurance samples will be used to evaluate the quality of the data obtained from <br />the field program. Two distinct types of quality assurance samples will be used for this <br />purpose. <br />1. Blind duplicates of water samples will be submitted to the testing <br />laboratory at a minimum rate of 1 per 10 regular samples obtained, but <br />no less than one per ice chest, to determine the precision of the <br />laboratory analyses. <br />2. Field travel blanks will be submitted at a rate of 1 per 10 water samples <br />collected, but no less than one per ice chest, in order to determine if <br />cross contamination occurred in transit. All field travel blanks will be <br />supplied by the testing laboratory. <br />Soil and groundwater samples will be submitted to a State of California -certified <br />analytical laboratory for chemical analyses. Established QA/QC procedures for <br />analytical operations will include sample custody procedures, standards of analytical <br />accuracy, analyses of matrix spikes and method blanks, data reduction, verification of <br />raw analytical data, and maintenance of control charts to monitor analytical <br />performance. These QA/QC procedures are outlined in the laboratory Quality <br />Assurance/Quality Control Plan which is available upon request. Organic chemical <br />analyses will be performed in conformance with standard procedures established by the <br />United States Environmental Protection Agency (EPA) in "Guidelines Establishing Test <br />Procedures for the Analysis of Pollutants Under the Clean Water Act' <br />(40 CFR Part 136, October 1984). The laboratory is periodically evaluated through <br />external audits conducted by the EPA and the State of California Department of Toxic <br />Substances Control using QC laboratories. <br />402 331-98 63 A-6 <br />