Figure 1A-5. Sonar Safe Diving Distance/Exposure Time Worksheet (Completed Example)

APPENDIX 1A — Safe Diving Distances from Transmitting Sonar Change A 1A-11 Example 4: You are planning a routine dive for 120 minutes using wet-suited divers with hoods at a dive site which is 200 yards from an AN/SQS-53A sonar and 120 yards from an AN/SQS-23 sonar. The AN/SQS-53A sonar is transmitting an 800 msec pulse (0.8 sec) every 20 seconds. The duty cycle for the AN/SQS-23 sonar is unknown. Is this dive permitted? Provide justification for your decision. SONAR SAFE DIVING DISTANCE/EXPOSURE TIME WORKSHEET 1. Diver dress: Wet Suit - Un-hooded Wet Suit - Hooded X Helmeted 2. Type(s) of sonar: AN/SQS-53A and AN/SQS-23 3. PEL Table 1A-3 ; 1A-4 X ; 1A-5 ; 1A-6 4. Range(s) to sonar (yards): 200 (from SQS-53A); 120 (from SQS-23) 5. Estimated SPL at range(s) in step 3 (from table/column in step 3): SPL1 = 201; SPL2 = 196 (per reminder, use SPL for 112 yard range) Reminder: If range is between two values in the table, use the shorter range. If the SPL is measured at the dive site, use the measured value. 6. Depth Reduction 0 dB Reminder: 0 if not helmeted, see table in instructions if helmeted. 7. Corrected SPL (Step 5 minus Step 6) SPL1 201 – 0 = 201 dB; SPL2 196 – 0 = 196 dB; 8. Estimated PEL at SPL (from table/column in step 3 of the appendix): PEL1 = 143 min; PEL 2 = 339 min 9. Duty Cycle Known: Yes X (do step 9); No (stop) Adjusted PEL for actual duty cycle Actual DC % = 100 × 0.8 sec. (pulse length / 20 sec. (pulse repetition period) Actual DC % = 4 Adjusted PEL = PEL (from step 8) 143 min. × 20 / actual duty cycle (%) 4 = 715 min. PEL1 = 715 minutes; PEL2 = 339 minutes Reminder: Do not adjust the PEL if duty cycle is unknown. 10. Multiple Sonars: Yes X (do step 10); No (stop) Sonar 1: DT1 = 120 (Desired dive duration) PEL1 = 715 (from Step 8 or 9, as applicable) DT1/PEL1 = 120/715 = 0.17 . Sonar 2: DT1 = 120 (Desired dive duration) PEL1 = 339 (from Step 8 or 9, as applicable) DT1/PEL1 = 120/339 = .35 . ND = 0.17 + 0.35 = 0.52 (This is less than 1.0, so dive is acceptable and may proceed.) Reminder: The Noise Dose must not exceed a value of 1.0. The dive time of 120 minutes is permitted because the ND is less than 1.0. Figure 1A-5. Sonar Safe Diving Distance/Exposure Time Worksheet (Completed Example).