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PMY <br /> 5.3 Naming Convention <br /> For the Vista Del Rio Subdivision project, (VDR),composite sampling will be employed using a 5-point sampling <br /> methodology. The protocols include the collection of 5 separate individual aliquot samples from a decision <br /> unit area. These aliquot samples will be named as follows: <br /> • Project Indicator: VDR= Visa Del Rio Subdivision <br /> • Sample Type: SS = Soil; BD = Blind Duplicate; RB = Rinse Water Blank <br /> • Sample Location/Sequence: Lot(L) or Common (C) area#/DU =the defined lot or common area number <br /> and sequential DU (e.g., L I D02 or C I D35); ##= Sequential number of specific QA/QC type (e.g., BDO 1) <br /> • Sample Depth: 0 to 6 inches, 6 to 12 inches, 12 to 18 inches, or 18 to 24 inches (e.g., 06 = 0 to 6 inches, <br /> 12 = 6 to 12 inches, 18 = 12 to 18 inches, and 24 = 18 to 24 inches) <br /> • Sample Date:YYYYMMDD <br /> • Aliquot sample in sequence (I through 5) <br /> For example, an aliquot sample collected on July 1, 2022 from DU36 on Lot 5 at 6 to 12 inches below ground <br /> surface for aliquot sample 2 of 5 will be labeled as VDR-SS-L5-D36-1 2-2022070 1-2.An aliquot sample collected <br /> on this same date from common area 2, DUOT from 18 to 24 inches below ground surface for aliquot sample <br /> 5 of 5 will be labeled as VDR-SS-C2-DO7-24-20220701-5.A BD sample collected from Lot 2, DU04,from 6 to <br /> 12 inches belowground surface for aliquot sample I out of 5 would be documented as such in the field logbook, <br /> then labeled as VDR-BDO 1-20220701. <br /> The individual aliquot sample jars from the same sampling location/depth will be placed into a gallon size <br /> zip lock TM type plastic bag and placed on-ice inside an insulated cooler. Each decision unit will have four <br /> separate plastic bags with aliquot samples from the four depth intervals. The bags will be labeled with <br /> VDR, the DU number, sampling depth and date. For example,the 5-point composite sample bag collected <br /> from DU34 at 6 to 12 inches would be labeled VDR-DU34-12-20220701. A blind duplicate sample, <br /> collected in the same manner and at the same time as the primary sample, would be labeled as VDR- <br /> BD01 C-20220701, where the C signifies this is the BD01 composite sample. Identification for the primary <br /> sample is documented in the field notebook. <br /> The chilled plastic bags will be delivered to the project laboratory under chain of custody documentation <br /> where the aliquot samples will be mixed, composited, and split into the appropriate samples for analysis. <br /> 5.4 Analytical Results <br /> The analytical results from the field blanks and equipment blanks should be evaluated for contaminants and <br /> compared to the analytical results of the field samples. If detectable levels of analytes are identified in the field <br /> QA/QC samples, the field samples may have been impacted by analytes from sampling equipment, sampling <br /> technique, or sampling transportation that are not present in the environment. Anomalies must be discussed <br /> in the report. <br /> Field Sampling QA/QC <br /> December 23, 2022 <br /> Page 3 of 3 <br />