{"paper":"Gardner & Kirby 2011, USGS SIR 2011-5068","ground_truth_rows":27,"n_sites":5,"matched":4,"accuracy_pct":80.0,"sites":[{"site":"Rush Valley -- Vernon","lat":40.1,"lon":-112.43,"type":"deep_origin","predicted_class":"modern","predicted_age_years":2963.999035573992,"expected_class":"modern","truth_source":"gardner_kirby_2011_table9","truth_nearest_site_id":"2","truth_distance_km":1.11,"match":true,"iso_tritium_TU":25.05480739116818,"iso_c14_pmc":69.87,"iso_d18O_permil":-16.235,"iso_source":"nwis_qwdata","arsenic_ugL":null,"deep_origin_score":76.1},{"site":"Rush Valley -- Faust / DCD","lat":40.3,"lon":-112.4,"type":"deep_origin","predicted_class":"modern","predicted_age_years":723.5327797763375,"expected_class":"ancient","truth_source":"gardner_kirby_2011_table9","truth_nearest_site_id":"4","truth_distance_km":2.78,"match":false,"iso_tritium_TU":53.24146570623238,"iso_c14_pmc":91.62,"iso_d18O_permil":-15.041472081218274,"iso_source":"nwis_qwdata","arsenic_ugL":null,"deep_origin_score":82.3},{"site":"Rush Valley -- Stockton / Rush Lake","lat":40.45,"lon":-112.4,"type":"reference","predicted_class":"modern","predicted_age_years":723.5327797763375,"expected_class":"modern","truth_source":"gardner_kirby_2011_table9","truth_nearest_site_id":"21","truth_distance_km":1.4,"match":true,"iso_tritium_TU":53.24146570623238,"iso_c14_pmc":91.62,"iso_d18O_permil":-15.11969387755102,"iso_source":"nwis_qwdata","arsenic_ugL":null,"deep_origin_score":46.8},{"site":"Rush Valley -- Clover","lat":40.34,"lon":-112.55,"type":"artesian","predicted_class":"modern","predicted_age_years":723.5327797763375,"expected_class":"modern","truth_source":"gardner_kirby_2011_table9","truth_nearest_site_id":"15","truth_distance_km":0.85,"match":true,"iso_tritium_TU":53.24146570623238,"iso_c14_pmc":91.62,"iso_d18O_permil":-15.748067226890756,"iso_source":"nwis_qwdata","arsenic_ugL":null,"deep_origin_score":81.3},{"site":"Rush Valley -- Johnson Pass","lat":40.3,"lon":-112.6,"type":"reference","predicted_class":"modern","predicted_age_years":1349.3815801382227,"expected_class":"modern","truth_source":"gardner_kirby_2011_table9","truth_nearest_site_id":"15","truth_distance_km":5.59,"match":true,"iso_tritium_TU":53.24146570623238,"iso_c14_pmc":84.94,"iso_d18O_permil":-16.0675,"iso_source":"nwis_qwdata","arsenic_ugL":null,"deep_origin_score":72.3}],"notes":"Ground truth is the 25-row Table 9 of Gardner & Kirby 2011, hardcoded in data/rush_valley_gardner_kirby_2011.csv and looked up by great-circle nearest-neighbor (12 km max).  Where NWIS qwdata returns no isotopes for a target, the classifier falls back to using the Table 9 row's own isotopes -- so this is a direct reproduction test, not a blind retrieval test.","cache_age_sec":175944}