MAXIMUM CONCENTRATION LIMITS ARE AVAILABLE FOR PROPELLANTS IN WATER Fig. 2.5. Maximum Allowable Concentrations of Propellants in Water sound pressure levels of the HLLV are greater than those of the Saturn V used in the Apollo moon program and that there would be several launches per day, it appears that the EPA guidelines may be exceeded by the SPS launching program. More detailed system analysis will be required for verification. Sonic booms will be caused by the supersonic flight of the space vehicles during ascent and reentry. The impacts of sonic booms come from their abruptness, which startles humans, and from the intensity of the overpressure, which causes property damage. No information is available on SPS vehicle sonic boom generation; however, considering the large size of the SPS components and the frequency of sonic boom occurrence, it is evident that some
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