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This report presents a summary of data collected from June 1984 to September 1986 as part of an experimental research program conducted in conjunction with the National Acid Precipitation Assessment Program that is designed to quantify the interaction of acid precipitation with a carbonaterock surface. Precipitation-runoff samples were collected from polypropolene receptacles (blank samples), glass plates, and flat surfaces of two types of carbonate rocks Salem limestone (from Indiana) and Shelburne marble (from Vermont). The summary is based on onsite and laboratory measurements for 1,078 samples that are available in a computer-data file. The data file consists of precipitation samples collected at four sites, which are representative of 247 storms, distilled-water reference samples, and standardwater reference samples. INTRODUCTION The National Acid Precipitation Assessment Program, Task Group G--Effects on Materials and Cultural resources was organized, in part, as a 10-year program to measure and document acid-precipitation effects on two types of stone: Salem limestone (from Indiana) and Shelburne marble (from Vermont). Four field-research locations were established in the eastern United States at Newcomb, New York; Chester, New Jersey; Washington, D.C.; and Research Triangle Park, North Carolina. Precipitation-runoff samples from polypropolene receptacles, glass plates, and stone surfaces were analyzed. Details of the onsite and laboratory procedures are given elsewhere (Reddy and others, 1985; Reddy and Werner, 1985; Sherwood, 1984). Sample preparation, analytical procedures, and laboratory quality-control protocols applied in the U.S. Geological Survey laboratory are described by Fishman and Friedman (1985). This work has been conducted as part of the National Acid Precipitation Assessment Program and was funded in part by the National Park Service. Results and conclusions presented in this publication do not necessarily reflect the views of the National Acid Precipitation Assessment Program or the National Park Service. DATA FILE Precipitation-runoff analysis data are available for samples collected and analyzed from June 1984 to September 1986. Five types of samples were collected from 247 storms during this period. To evaluate onsite-sampling variability, replicate samples were collected from adjacent stones of the same type. Duplicate samples were submitted to the laboratory to identify variability caused by sample processing and handling. Additional distilledwater reference samples and standard-water reference samples (SRWS) were submitted to the laboratory with the onsite samples. The reference samples were processed exactly as the onsite samples. During the indicated period, 1,078 samples were processed; results are available in the data file described in this report. The data set consists of 25 variables. Variable names and codes established for source of samples and sample types are described in table 1. Variable names and codes established for sample collection and precipitation type are listed in table 2. Variable names for parameters measured onsite and in the laboratory are identified in table 3. All data were entered twice to eliminate keypunching errors. The two files were compared and discrepancies were rectified. An additional check on the quality of the data was provided by an examination of summary statistics for the data, sorted by sample type. Samples with exceptionally large or small values were examined to determine if the values were true or erroneous. The summary statistics for each sample type are given in tables 4 through 11. Table 1. --Variable names and codes established for source of samples and sample types Variable name Code Definition Source of samples Sample type DC Washington, D.C. LB Reference samples from U.S. Geological Survey laboratory, Denver, Colorado. NJ Chester, New Jersey. NC Research Triangle Park, North Carolina. NY Newcomb, New York. B Blank (empty receptacle) rack. G Glass. L Limestone. M Marble. D Distilled-water reference sample. M-82 M-82 standard-reference water sample. P Recording precipitation monitor. Table 2.-'Variable names and codes established for sample collection and precipitation type Variable name Code Definition Year Event Side

u.s. geological survey open file report/open-file report

Summary of data from onsite and laboratory analyses of precipitation runoff from carbonate-stone surface, National Acid Precipitation Assessment Program, June 1984 to November 1987