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Appendix I. Pump tests are designated by BOX for ambient air sample <br /> pumps and by SS for surface sampler pumps. <br /> 5. 1 .5 Field Blanks <br /> Field blanks were used to determine if samples were contaminated <br /> through handling procedures other than sampling. Tedlar bags were <br /> prepared by the procedure described under "Tedlar Bag Preparation" to <br /> verify that the bags and the nitrogen used as the blank reagent were <br /> free of contamination before they were shipped to the landfill . <br /> The field blanks were transported to the landfill in light-sealed <br /> boxes in the sampling van. The blanks remained in the field during <br /> the test period and were shipped with the air samples to the laborato- <br /> ry for analysis. The blanks were labeled to be indistinguishable from <br /> the other field samples. The sample designations for the Corral <br /> Hollow Sanitary Landfill are AA-5, AA-10, AA-15, W-6, W-7, and TB-l . <br /> AA-5, AA-10, and AA-15 were field blanks during the ambient air sam- <br /> pling. W-6 and W-7 were field blanks during the landfill gas sam- <br /> pling. TB-1 was a field blank during the integrated surface walk <br /> sampling. <br /> Benzene, methylene chloride, 1,1, 1-trichloroethane, trichloroethylene, <br /> and chloroform were detected in one or more field blanks. Benzene, <br /> trichloroethylene, and chloroform concentrations were below their <br /> respective regulatory detection limits. Table 7 summarizes the data <br /> for the field blanks. The analytical results are included in Appen- <br /> dix I . <br /> The presence of the low concentrations less than 11 b of VOCs in <br /> P ( ppb) <br /> the field blanks may be a result of compounds bleeding from the Tedlar <br /> bags or permeating from the laboratory atmosphere. <br /> In discussions with the Bay Area Air Quality Management District <br /> (BAAQMD) laboratory, EMCON learned that the BAAQMD has found that <br /> PJ9 9390304.00D 5-3 Rev. 0 09/20/88 <br />