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0 1 - LEVI N E•FRICKE to DOHS policy, the'TTLC for DDT is applied to the sum of all DDT-related compounds. ; 1 Arsenic and lead were detected in all of '�thegfield area compo- sited samples. Reported arsenic concentrations ranged from 4 to 13 ppm, and lead concentrations ranged €rom 4): to 8 ppm (Figure 4) . These concentrations are well belowTTLC concentrations, and are within naturally occurring ranges (L.,ndsa`y, 1979) . Mercury was not detected in any of the composited samples analyzed. Chlorinated herbicides and organophosphate compounds were not detected by the analyses conducted in field area composited samples. 12.2 Northeast Area !j 4 Pesticides The insecticide DDT and related compounds were detected in .the composite of the three samples collected !1at approximately one foot below grade from three locations west of? the Quonset hut, outside the entrance to the but (Q-1, Q-i, Q-;3) (Figure 5) . The compounds 4,4-DDT and 2,4-DDT were detected in the composited sample at concentrations of 0.4 and 0.096 ppm!,, respectively. The compounds 4,4-DDD and 4,4-DDE were detected in the sample at con- centrations of 0.013 and 0.13 ppm, respectively. Chlorinated herbicides were not detected in the compo'sited sample. Arsenic was detected at a concentration of 5.6 ppm; lead at 15 ppm, and mercury at the detection limit of 0.2 ppm. These concentrations are all below the TTLC for these metals (1j. Marshack, 1986) , and are within naturally occurring ranges for< soi:ls (Lindsay, 1979) . Because ,.the sum of the concentrations ofthe..DDT-related com- pounds detected in this sample was near the cumulative TTLC of 1 ppm for these compounds, the individual portions of the compo- sited sample that had been held by the laboratory were subsequently analyzed. The results indicated! that one of the individual samples, Q-1 (one foot below g�rade) , contained concen- trations of DDT and related compounds above the TTLC (1.6 ppm of 4,4-DDT; 0.42 ppm of 2,4-DDT; 0.49 ppm of� 4, 4{f,-DDE; and 0.22 ppm of 4, 4-DDD) ; the sum concentrations of DDT-related compounds in the sample is 2.73 ppm. The total concentrations of DDT-related compounds in the other three individual samples were 0. 193 and 0. 22, considerably below the TTLC value. I'The� insecticide Diel- drin was also detected in Q-3 (one foot below'hgrade ) at 0. 13 ppm. The TTLC for this compound is 8 ppm' (J.'yMarshack, 1986) . jTo assess the areal extent of affected so ils,';` several additional samples were collected in the vicinity of,' Q-1'Iand analyzed for DDT and related compounds. The compounds, 4,44 DDT and 4 ,4-DDE were detected in 'Q-5 at 0. 014 and 0.012 ppm, respectively. The -17_ k