[en] The monitoring program at the Maywood Interim Storage Site (MISS) measures thoron and radon concentrations in air; external gamma radiation levels, and thorium, uranium, and radium concentrations in surface water, groundwater, and sediment. The radiation dose was calculated for a hypothetical maximally exposed individual to verify that the site is in compliance with the DOE radiation protection standard (100 mrem/yr) and to assess its potential effects on public health. Based on the conservative scenario described in this report, this hypothetical individual receives an annual external exposure approximately equivalent to 1 percent of the DOE radiation protection standard. This exposure is less than a person receives during a round-trip flight from New York to Los Angeles (because of the greater amounts of cosmic radiation present at higher altitudes). Cumulative dose to the population within an 80-km (50-mi) radius of the MISS that results from radioactive materials present at the site is indistinguishable from the dose the same population receives from naturally occurring radioactive sources. Results of the 1988 monitoring show that the MISS is in compliance with the DOE radiation protection standard and with applicable permit requirements specified by the New Jersey Department of Environmental Protection Division groundwater permits. 20 refs., 17 figs., 34 tabs