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AMBIENT AIR VCM MONITORING GRAB SAMPLES - CHARCOAL TUBE SAMPLES 1974 /V Total No. Samples ND (None Detected) > ND, <0.5 ppmv >0.5 ppmv, <1.0 ppmv >"1.0 ppmv i Total No. Samples ND (None Detected) > ND,< 0.5 ppmv >0.5 ppmv ,<1.0 ppmv ^1.0 ppmv Total No. Samples ND (None Detected) > ND, <0.5 ppmv >0.5 ppmv,<1.0 ppmv >"1.0 ppmv Fence Line 65 57 8 None None 47 46 1 None None Community 128 119 9 None None 178 173 5 None None Fence Line Community 2 None 2 None None 11 10 1 None None 1975 29 25 4 None None 37 30 17 None None 1976 (Charcoal Tube Samples Only, 4 Hrs. Duration) 24 20 4 None None 30 29 1 None None 1. Grab samples collected in 50 ml syringes and analyzed by directed injection in GC (FID) 2. Charcoal Tube samples collected by battery powered pumps, desorbed by solvent extraction then analyzed by GC (FID). 3. Sensitivity of methods (1) and (2) is approximately 0.05 ppmv. Hence, ND (None Detected) is less than 0.05 ppmv. UCC 103933 COMMUNITY AMBIENT AIR VCM MONITORING GRAB SAMPLES Total No. Samples ND (None Detected) y ND,<0.5 ppmv >0.5 ppmv,< 1.0 ppmv >1.0 ppmv 128 119 9 None None Total No. Samples ND (None Detected) > ND, < 0.5 ppmv >0.5 ppmv ,<1.0 ppmv >1.0 ppmv 178 173 5 None None Total No. Samples ND (None Detected) > ND,< 0.5 ppmv >0.5 ppmv ,<1.0 ppmv >1.0 ppmv Grab Samples Discontinued 1974 1975 1976 CHARCOAL TUBE SAMPLES 11 10 1 None None 37 20 17 None None 30 29 1 None None 1. Grab samples collected in 50 ml syringes, analyzed by direct injection in GC (FID). 2. Charcoal tube samples collected by battery powered pumps for minimum of 4-hour durations Desorption of any existing VCM by solvent extraction then analyzed by GC (FID). 3. Sensitivity in methods described above is approximately 0.05 ppmv. Hence, ND (None Detected) is less than 0.05 ppmv. UCC 103934 UCC 103935 October, 1975 Total No. Samples Average, ppmv Std. Dev. of Avg. No. Times >25 ppmv November, 1975 Total No. Samples Average, ppmv Std. Dev. of Avg. No. Times >25 ppmv December, 1975 Total No. Samples No. Times >25 ppmv January, 1976 Total No. Samples Average, ppmv Std. Dev. of Avg. No. Times > 5 ppmv No. Times >25 ppmv February, 1976 Total No. Samples Average, ppmv Std. Dev. of Avg. No. Times >5 ppmv No. Times ^25 ppmv March, 1976 Total No. Samples Average, ppmv Std. Dev. of Avg. No. Times >5 ppmv No. Times >25 ppmv AMBIENT AIR MONITORING SEQUENTIAL SAMPLING - VAPOR FRACTION ANALYZER NORTH CHARLESTON DISTRIBUTION CENTER FENCELINE - NORTH OF UNLOADING RACK No. 1 - West No. 3 - Center 1116 0.3 1.0 1 1116 0.2 1.0 1 1080 0.3 0.3 None 1080 0.2 0.2 None / 1116 None 1116 None 900 0.3 0.5 None None 900 0.2 0.3 None None 972 0.2 0.5 2 None 972 0.1 1.1 1 1 1080 0.1 0.5 2 None 1080 0.0 0.3 None None No. 5 - Bast 1116 52 37 1 1080 12 44 16 1116 16 900 16 34 71 i5 972 12 42 63 23 1080 0 .7 2 .9 38 5 April, 1976 Total No. Samples No. Times 5 ppmv No. Times 25 ppmv AMBIENT AIR MONITORING (cont.) No. 1 - West No. 3 - Center 730 2 None 730 2 1 No. 5 - East 730 16 2 W. C.Young 4/23/76 V UCC 103936