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GROUND ZERO ANALYSIS,INC. Quality Control/Quality Assurance Plan Site drawings, maps or air photos will be used, as appropriate, for establishing and recording the location of sample collection, or making notations for field observations. Photographs will be taken at all areas of interest and sample locations. Photos will also be taken to supplement field notes, record sampling activities or to note unusual conditions. For each photograph taken,the following information will be written in the logbook or recorded in the field photography log: • Time, date, location, and weather conditions • Description of the subject photographed • Name of person taking the photograph 1.2 Sample Identification Samples will be uniquely designated with a sample identification number conforming to the requirements of RP-006 Sample Collection Procedure,DMS-7209030-RIP-45 Rev. 0,April 2015c. The following information shall be listed on each sample containers: • Date and time sample was obtained • Sampler's initials The information will be marked with an indelible marker on a sample label or a tag affixed to each sample container. A Sample Tracking Log will be maintained by the sampling personnel to track all collected samples. 1.3 Location of Samples The sampling locations will be accurately located by using measured distances from permanent landmarks on the scaled site maps,by survey or by GPS instrumentation.The method and accuracy will be determined by project Data Quality Objectives (DQOs). 1.4 Sample Custody Sampling personnel will complete the COC form prior to transferring samples to the laboratory either by direct delivery or courier service. A sample is under custody, if one or more of the following criteria are met: • It is in the sampler's possession • It is in the sampler's view after being in possession • It is in a designated secure area At a minimum, for each sample, the required analyses, sample collection date/time, and the individuals or organizations performing the sample collection, shipment, and receipt will be listed on the COC. Sample custody is the responsibility of the field crew from the time of sample collection until the samples are accepted by the laboratory courier service for delivery to the G:\Data\GROUNDZE\STALLWORTH AUTO SALES(N CA)1380\Workp1an\QA.QC Plan.docx 2