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Benzene, methylene chloride, tetrachloroethylene, and 1, 1,1-trichloro- <br /> ethane were detected in the surface walk sample. Benzene and tetra- <br /> chloroethylene concentrations were below their respective regulatory <br /> detection limits. A field blank (TB-1) was also submitted to the <br /> laboratory for analysis with SW-1. Analytical results for TB-1 are <br /> presented in Table 7. Methylene chloride and 1, 1,1-trichloroethane <br /> were also detected in the field blank. <br /> Organic vapors analyzed as methane were detected at 4.4 ppm in the <br /> surface walk sample. <br /> i <br /> i <br /> PJ9 9390304.00D 2-9 Rev. 0 08/29/88 <br />