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w� <br /> B2 <br /> Color Spot, Inc. <br /> October 10, 1989 (88168B) <br /> i <br /> _ Prior to initiating analyses of the sail vspors, <br /> the GC-PID was <br /> calibrated three times in sequence to a BTEX standard supplied by Scott Specialty <br /> Gases (Scott Specialty Gases Project). The standard used at the facility had <br /> an analytical accuracy of ±2 percent. The TVPH was referenced to an unleaded <br /> gasoline standard supplied by Central Coast Analytical Services in San Luis <br /> Obispo, California. Duplicate analyses were conducted periodically to check the <br /> GC-PID for precision. A field blank was analyzed by drawing ambient air through <br /> the sampling equipment to test for residual contamination in the sampling system. <br /> j Field blanks were analyzed periodically to ensure that the sampling equipment <br /> was being properly decontaminated. The decontamination pr <br /> acadure included a <br /> a non-phosphate (TSP brand) detergent wash, followed by a tap water rinse, and two <br /> distilled water rinses. <br /> After the soil vapor study was completed, each of the soil vapor <br /> monitoring locations were grouted, filled and sealed, from bottom to top, with <br /> a cement-bentonite slurry. <br /> Ground dater Sampling. Three exis0,si5 domestic ground water wells <br /> were sampled by purging the sample cock for two to three minutes and completely . <br /> filling the sample container with water, to ensure no head space in the container _ <br /> to prevent volatilization of the sample. The samples from each well were <br /> collected in two 40-m1 VOA vials and a 1-liter amber glass bottle. The <br /> VOAvials <br /> were preserved with sodium azide o <br /> r sodium hydrogen sulfate and were used <br /> 1-liter amber glass bottles <br /> analyses.of organic contaminants. The were preserved 1 <br /> with nitric acid and were used for analyses for total lead. <br /> < tainers were <br /> Immediately after the samples were collected, the battles (VOA F <br /> sealed,'without head space, labeled, taped shut, secured in guard <br /> vials), and placed in an ice chest containing artificial ice for preservation. -~ y <br /> Chain-of-custody documentation accompanied the , ground water samples from �. <br /> ' collection until delivery to the laboratory. E <br /> i <br /> r <br /> s u 'E <br />