Location Prec. Flask Results 10-15 ¢/l Date Street Samples 58th & Tenth Ave. Prec. 1/23/57 1545 93rd & Riverside Dr. Prec. 1/29/57 1330 30 1332 180 1/30/57 1110 2/6/57 1400 1402 120 120 110 120 1322 190 Cc. Park - Lot None L32nd & Twelfth Ave. None 1/30/57 C. Park - 7éend St. Exit None 2/6/57 1331 60 70 1323 1324 70 100 1430 160 | 1432 100 140 1431 Building Samples Warehouse A - lst Floor None 12/11/56 1hks LES Office A* Office A None 12/13/56 1545 None 1/7/57 1/10/57 1/15/57 Office A* Office A Prec. Prec. Apartment A None 1545 1546 1547 1530 1531 1532 1436 1437 390 390 270 180 160 230 120 130 150 neler 1438 L402 1500 1501 1502 130 70 70 12/20/56 1343 1344 1345 1401 1402 10 380 370 270 330 2/7/57 190 160