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positive results. Samples will be prepared and analyzed at the rate specified in each analytical laboratories internal QA/QC procedures. 7.3.3 Method Detection Limits and Reporting Limits The MDL is the minimum concentration of a substance in a sample that does not cause matrix interferences that may be measured and reported with 99 percent confidence that the analytes concentration is greater than zero. The laboratories shall establish MDLs for each method, matrix, and analytes for each instrument the laboratories plans to use for the project. The laboratories shall revalidate these MDLs at least once per 12-month period. The RL is the lowest concentration at which an analyte can be detected in a sample and its concentration can be reported with a reasonable degree of accuracy and precision. For samples that do not pose a particular matrix problem, the RL is typically about 3 to 5 times higher than the MDL. All results shall be reported at or above the MDL values. However, for those results falling between the MDL and the RL, a "J" flag shall be applied to the results indicating the variability associated with the result. The target RLs for this Study will be driven by the proposed regulatory screening levels included in the Workplan. The RLs (and MDLs) based on standard USEPA analytical methods with DTSC-approved procedure modifications when required. For the majority of the analytes, the target RLs are expected to be less than the corresponding proposed screening levels. 8.0 SAMPLING DESIGN The purpose of the activities and details concerning the sampling methodology are provided in the accompanying Workplan. The estimated number of samples to be collected during implementation of the Workplan is provided in Table Al; the analytical methods to be utilized are also specified in Table Al. The sample containers, preservation and holding times are summarized in the SAP (Table 131). 9.0 FIELD INSTRUMENT CALIBRATION AND MAINTENANCE PROCEDURES Any instruments used in the field will be calibrated to assure that the data obtained are representative of actual field conditions. The calibration procedures and frequency of calibration will be as specified by the manufacturer of the instrument. The calibration procedure, time and date of the procedure, equipment identification number, and type of standards used will be recorded on the daily field report and/or notebooks that are maintained for each piece of equipment. All equipment used during monitoring activities will be maintained, calibrated, and operated by field personnel according to manufacturer guidelines and recommendations. Calibration records that are traceable to the equipment will be maintained by field personnel. Quality Assurance/Quality Control Plan Tracy Corners Shopping Center 3225 North Tracy Boulevard Tracy,California 95376 Partner Project Number SM14-129814 Docket Number HAS-VCA 14/15-108 August 15,2016 Page 12