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1) Site location and conditions; <br />2) Current and previous weather conditions; and <br />3) Field personnel. <br />Samples will be split into bottle containers which are provided by the laboratory with appropriate chemical <br />preservatives and stored on ice. Data collected during the field events will be analyzed after receipt of <br />laboratory testing results and a summary report will be issued based on the proposed schedule. <br />If a contaminant "spike" or marked increase is observed during field sampling or when laboratory results are <br />received, a letter report would be written to the DMG describing the issue and proposed action. If the <br />observed issue presented an immediate public health risk, this information would also be reported to the <br />CDPHE and local agencies. Potential mitigation measures are discussed in Section 4.3 below. <br />4.2 Quality Assurance/Quality Control and Data Validation <br />Quality assurance /quality control (QA/QC) procedures are implemented during both field data collection <br />and laboratory analyses. This section describes these procedures for field and laboratory investigative <br />phases. <br />Many aspects of field QA/QC are exercised through the use of data collection procedures in accordance <br />with accepted standards. In addition to these field procedures, field QA1QC samples will be collected as <br />follows: <br />1. Bottle/Preservation Blank - A blank sample will be prepared by the laboratory per sampling event. <br />One bottle of each material/preservation combination is filled with water, transported to the site, <br />handled like a regularly collected sample and returned unopened to the laboratory for analysis. <br />2. Equipment Blanks -One equipment rinsate blank sample will be collected per day or per every 20 <br />regular samples collected, if more than 20 samples are collected per day. An equipment blank is <br />prepared bypassing deionized water through the usual sample collection equipment, transferring it <br />to appropriate sample containers and returning it to the laboratory for analysis. <br />3. Blind Duplicate Samoles -One blind duplicate (split) sample will be collected per day or per every <br />20 regular samples collected, if more than 20 samples are collected per day. Blind duplicate <br />samples are collected at the same location and time, but are placed indifferent bottles and labeled <br />appropriately for separate analysis. Similar aliquots from the duplicate pair are filled in quarter- <br />6ottle increments to aid sample homogeneity. <br />Analytical data for the surface water samples will be evaluated during this task. The data obtained during <br />this investigation will be validated using the procedures contained in Functional Guidelines for Evaluating <br />Inorganics Analysis (EPA, 1989) or equivalent protocol. In addition to reviewing sample holding time limits, <br />results will be reviewed for analysis of preparation blanks and calibration blanks, duplicate samples, matrix <br />spikes, and laboratory control standards. Those data that are identified during the validation process as <br />being outlying observation may be re-analyzed by the laboratory. Where applicable, data that exceed <br />acceptable control limits, as defined by the data validation protocol, will be qualified. Validated data will be <br />incorporated into a database and used for data evaluation and report preparation. <br />4.3 Data Evaluation and Reporting <br />The quarterly monitoring results will be reported in the form of: (1) an interim tabular data listing submitted <br />for review after validation of the laboratory data; and (2) an annual data report prepared after validation of <br />the fall event laboratory results. In the annual report, quarterly event data will be presented to: <br />• Identify spatial and temporal trends in water quality and contaminant loading; and <br />Groundwater Sampling and Analysis Plan November 2005 <br />Lupton Lakes Project -4- <br />