# # File created on 2024-05-01 22:54:16 EDT # # U.S. Geological Survey # # This file contains selected water-quality data for stations in the National Water # Information System water-quality database. Explanation of codes found in this file are # followed by the retrieved data. # # The data you have secured from the USGS NWISWeb database may include data that have # not received Director's approval and as such are provisional and subject to revision. # The data are released on the condition that neither the USGS nor the United States # Government may be held liable for any damages resulting from its authorized or # unauthorized use. # # To view additional data-quality attributes, output the results using these options: # one result per row, expanded attributes. Additional precautions are at: # https://help.waterdata.usgs.gov/tutorials/water-quality-data/help-using-the-water-quality-data-retrieval-system#Data_retrievals_precautions # # agency_cd - Agency Code # site_no - USGS site number # sample_dt - Begin date # sample_tm - Begin time # sample_end_dt - End date # sample_end_tm - End time # sample_start_time_datum_cd - Time datum # tm_datum_rlbty_cd - Time datum reliability code # coll_ent_cd - Agency Collecting Sample Code # medium_cd - Sample Medium Code # tu_id - Taxonomic unit code # body_part_id - Body part code # parm_cd - Parameter code # remark_cd - Remark code # result_va - Parameter value # val_qual_tx - Result value qualifier code # meth_cd - Method code # dqi_cd - Data-quality indicator code # rpt_lev_va - Reporting level # rpt_lev_cd - Reporting level type # lab_std_va - Lab standard deviation # anl_ent_cd - Analyzing entity code # # The following parameters are included: # 00003 - Sampling depth, feet # 00010 - Temperature, water, degrees Celsius # 00028 - Agency analyzing sample, code # 00059 - Flow rate, instantaneous, gallons per minute # 00095 - Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius # 00191 - Hydrogen ion, water, unfiltered, calculated, milligrams per liter # 00300 - Dissolved oxygen, water, unfiltered, milligrams per liter # 00400 - pH, water, unfiltered, field, standard units # 07000 - Tritium, water, unfiltered, picocuries per liter # 30217 - Dibromomethane, water, unfiltered, recoverable, micrograms per liter # 32101 - Bromodichloromethane, water, unfiltered, recoverable, micrograms per liter # 32102 - Tetrachloromethane, water, unfiltered, recoverable, micrograms per liter # 32103 - 1,2-Dichloroethane, water, unfiltered, recoverable, micrograms per liter # 32104 - Tribromomethane, water, unfiltered, recoverable, micrograms per liter # 32105 - Dibromochloromethane, water, unfiltered, recoverable, micrograms per liter # 32106 - Trichloromethane, water, unfiltered, recoverable, micrograms per liter # 34010 - Toluene, water, unfiltered, recoverable, micrograms per liter # 34030 - Benzene, water, unfiltered, recoverable, micrograms per liter # 34215 - Acrylonitrile, water, unfiltered, recoverable, micrograms per liter # 34301 - Chlorobenzene, water, unfiltered, recoverable, micrograms per liter # 34311 - Chloroethane, water, unfiltered, recoverable, micrograms per liter # 34371 - Ethylbenzene, water, unfiltered, recoverable, micrograms per liter # 34396 - Hexachloroethane, water, unfiltered, recoverable, micrograms per liter # 34413 - Bromomethane, water, unfiltered, recoverable, micrograms per liter # 34418 - Chloromethane, water, unfiltered, recoverable, micrograms per liter # 34423 - Dichloromethane, water, unfiltered, recoverable, micrograms per liter # 34475 - Tetrachloroethene, water, unfiltered, recoverable, micrograms per liter # 34488 - Trichlorofluoromethane, water, unfiltered, recoverable, micrograms per liter # 34496 - 1,1-Dichloroethane, water, unfiltered, recoverable, micrograms per liter # 34501 - 1,1-Dichloroethene, water, unfiltered, recoverable, micrograms per liter # 34506 - 1,1,1-Trichloroethane, water, unfiltered, recoverable, micrograms per liter # 34511 - 1,1,2-Trichloroethane, water, unfiltered, recoverable, micrograms per liter # 34516 - 1,1,2,2-Tetrachloroethane, water, unfiltered, recoverable, micrograms per liter # 34536 - 1,2-Dichlorobenzene, water, unfiltered, recoverable, micrograms per liter # 34541 - 1,2-Dichloropropane, water, unfiltered, recoverable, micrograms per liter # 34546 - trans-1,2-Dichloroethene, water, unfiltered, recoverable, micrograms per liter # 34551 - 1,2,4-Trichlorobenzene, water, unfiltered, recoverable, micrograms per liter # 34566 - 1,3-Dichlorobenzene, water, unfiltered, recoverable, micrograms per liter # 34571 - 1,4-Dichlorobenzene, water, unfiltered, recoverable, micrograms per liter # 34668 - Dichlorodifluoromethane, water, unfiltered, recoverable, micrograms per liter # 34696 - Naphthalene, water, unfiltered, recoverable, micrograms per liter # 34699 - trans-1,3-Dichloropropene, water, unfiltered, recoverable, micrograms per liter # 34704 - cis-1,3-Dichloropropene, water, unfiltered, recoverable, micrograms per liter # 39175 - Vinyl chloride, water, unfiltered, recoverable, micrograms per liter # 39180 - Trichloroethene, water, unfiltered, recoverable, micrograms per liter # 39702 - Hexachlorobutadiene, water, unfiltered, recoverable, micrograms per liter # 49991 - Methyl acrylate, water, unfiltered, recoverable, micrograms per liter # 49999 - 1,2,3,4-Tetramethylbenzene, water, unfiltered, recoverable, micrograms per liter # 50000 - 1,2,3,5-Tetramethylbenzene, water, unfiltered, recoverable, micrograms per liter # 50002 - Bromoethene, water, unfiltered, recoverable, micrograms per liter # 50004 - tert-Butyl ethyl ether, water, unfiltered, recoverable, micrograms per liter # 50005 - Methyl tert-pentyl ether, water, unfiltered, recoverable, micrograms per liter # 71865 - Iodide, water, filtered, milligrams per liter # 71870 - Bromide, water, filtered, milligrams per liter # 73547 - trans-1,4-Dichloro-2-butene, water, unfiltered, recoverable, micrograms per liter # 73570 - Ethyl methacrylate, water, unfiltered, recoverable, micrograms per liter # 75985 - Tritium 2-sigma combined uncertainty, water, unfiltered, picocuries per liter # 77041 - Carbon disulfide, water, unfiltered, micrograms per liter # 77093 - cis-1,2-Dichloroethene, water, unfiltered, recoverable, micrograms per liter # 77103 - n-Butyl methyl ketone, water, unfiltered, recoverable, micrograms per liter # 77128 - Styrene, water, unfiltered, recoverable, micrograms per liter # 77135 - o-Xylene, water, unfiltered, recoverable, micrograms per liter # 77168 - 1,1-Dichloropropene, water, unfiltered, recoverable, micrograms per liter # 77170 - 2,2-Dichloropropane, water, unfiltered, recoverable, micrograms per liter # 77173 - 1,3-Dichloropropane, water, unfiltered, recoverable, micrograms per liter # 77220 - 2-Ethyltoluene, water, unfiltered, recoverable, micrograms per liter # 77221 - 1,2,3-Trimethylbenzene, water, unfiltered, recoverable, micrograms per liter # 77222 - 1,2,4-Trimethylbenzene, water, unfiltered, recoverable, micrograms per liter # 77223 - Isopropylbenzene, water, unfiltered, recoverable, micrograms per liter # 77224 - n-Propylbenzene, water, unfiltered, recoverable, micrograms per liter # 77226 - 1,3,5-Trimethylbenzene, water, unfiltered, recoverable, micrograms per liter # 77275 - 2-Chlorotoluene, water, unfiltered, recoverable, micrograms per liter # 77277 - 4-Chlorotoluene, water, unfiltered, recoverable, micrograms per liter # 77297 - Bromochloromethane, water, unfiltered, recoverable, micrograms per liter # 77342 - n-Butylbenzene, water, unfiltered, recoverable, micrograms per liter # 77350 - sec-Butylbenzene, water, unfiltered, recoverable, micrograms per liter # 77353 - tert-Butylbenzene, water, unfiltered, recoverable, micrograms per liter # 77356 - 4-Isopropyltoluene, water, unfiltered, recoverable, micrograms per liter # 77424 - Iodomethane, water, unfiltered, recoverable, micrograms per liter # 77443 - 1,2,3-Trichloropropane, water, unfiltered, recoverable, micrograms per liter # 77562 - 1,1,1,2-Tetrachloroethane, water, unfiltered, recoverable, micrograms per liter # 77613 - 1,2,3-Trichlorobenzene, water, unfiltered, recoverable, micrograms per liter # 77651 - 1,2-Dibromoethane, water, unfiltered, recoverable, micrograms per liter # 77652 - 1,1,2-Trichloro-1,2,2-trifluoroethane, water, unfiltered, recoverable, micrograms per liter # 78032 - Methyl tert-butyl ether, water, unfiltered, recoverable, micrograms per liter # 78109 - 3-Chloropropene, water, unfiltered, recoverable, micrograms per liter # 78133 - Isobutyl methyl ketone, water, unfiltered, recoverable, micrograms per liter # 81552 - Acetone, water, unfiltered, recoverable, micrograms per liter # 81555 - Bromobenzene, water, unfiltered, recoverable, micrograms per liter # 81576 - Diethyl ether, water, unfiltered, recoverable, micrograms per liter # 81577 - Diisopropyl ether, water, unfiltered, recoverable, micrograms per liter # 81593 - Methyl acrylonitrile, water, unfiltered, recoverable, micrograms per liter # 81595 - Methyl ethyl ketone, water, unfiltered, recoverable, micrograms per liter # 81597 - Methyl methacrylate, water, unfiltered, recoverable, micrograms per liter # 81607 - Tetrahydrofuran, water, unfiltered, recoverable, micrograms per liter # 82082 - delta hydrogen-2/hydrogen-1, water, unfiltered, per mil # 82085 - delta oxygen-18/oxygen-16, water, unfiltered, per mil # 82625 - 1,2-Dibromo-3-chloropropane, water, unfiltered, recoverable, micrograms per liter # 85795 - m-Xylene plus p-xylene, water, unfiltered, recoverable, micrograms per liter # 90851 - Trihalomethanes, water, unfiltered, minimum summation, micrograms per liter # 90867 - Trihalomethanes, water, unfiltered, maximum summation, micrograms per liter # 99832 - 1,2-Dichloroethane-d4, surrogate, water, unfiltered, percent recovery # 99833 - Toluene-d8, surrogate, water, unfiltered, percent recovery # 99834 - 1-Bromo-4-fluorobenzene, surrogate, NWQL VOC schedules, water, unfiltered, percent recovery # 99871 - Number of tentatively identified compounds (TICS) from VOC analysis by GCMS, number # # Description of sample_start_time_datum_cd: # PST - Pacific Standard Time # # Description of tm_datum_rlbty_cd: # K - Known # # Description of coll_ent_cd and anl_ent_cd: # # Description of medium_cd: # WG - Groundwater # # Description of tu_id: # https://www.itis.gov/ # # Description of body_part_id: # # Description of remark_cd: # < - Less than # E - Estimated # # Description of val_qual_tx: # b - value extrapolated at low end # c - see result laboratory comment # d - sample was diluted # m - value is highly variable by this method # n - below the reporting level but at or above the detection level # t - below the detection level # # Description of meth_cd: # ALGOR - Computation by NWIS algorithm # CL033 - Anions, wf,ceric-arsenious color # EEGC1 - Tritium, wu, enrich gas counting # GCM66 - VOC, wu, acidified, GCMS # IC027 - New ion chromatography method # MS007 - Deuterium/Protium, wu, MS # MS020 - Oxygen-18/16, wu, by MS # # Description of dqi_cd: # R - Reviewed and approved # # Description of rpt_lev_cd: # IRL - Interim reporting level # LRL - Laboratory reporting level # MRL - Minimum reporting level # # Data for the following sites are included: # USGS 340655117184005 001S004W04E005S # agency_cd site_no sample_dt sample_tm sample_end_dt sample_end_tm sample_start_time_datum_cd tm_datum_rlbty_cd coll_ent_cd medium_cd tu_id body_part_id parm_cd remark_cd result_va val_qual_tx meth_cd dqi_cd rpt_lev_va rpt_lev_cd lab_std_va anl_ent_cd 5s 15s 10d 5d 10d 5d 3s 1s 8s 3s 11s 11s 5s 1s 12s 5s 5s 1s 12s 6s 11s 8s USGS 340655117184005 2006-02-07 15:40 PST K WG 00003 200 R USGS 340655117184005 2006-02-07 15:40 PST K WG 00010 22.7 R USGS 340655117184005 2006-02-07 15:40 PST K WG 00028 80020 R USGS 340655117184005 2006-02-07 15:40 PST K WG 00059 0.50 R USGS 340655117184005 2006-02-07 15:40 PST K WG 00095 652 R USGS 340655117184005 2006-02-07 15:40 PST K WG 00191 0.00006 ALGOR R USGS 340655117184005 2006-02-07 15:40 PST K WG 00300 7.3 R USGS 340655117184005 2006-02-07 15:40 PST K WG 00400 7.3 R USGS 340655117184005 2006-02-07 15:40 PST K WG 07000 12.77 EEGC1 R 0.300 MRL USGS 340655117184005 2006-02-07 15:40 PST K WG 30217 < 0.050 b GCM66 R 0.050 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 32101 < 0.028 b GCM66 R 0.028 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 32102 < 0.06 b GCM66 R 0.06 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 32103 < 0.13 GCM66 R 0.13 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 32104 < 0.10 GCM66 R 0.10 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 32105 < 0.10 GCM66 R 0.10 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 32106 E 0.10 b GCM66 R 0.024 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34010 E 0.04 b GCM66 R 0.02 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34030 E 0.015 n GCM66 R 0.021 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34215 < 0.80 GCM66 R 0.8 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34301 < 0.028 b GCM66 R 0.028 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34311 < 0.12 GCM66 R 0.12 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34371 < 0.030 b GCM66 R 0.030 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34396 < 0.14 GCM66 R 0.14 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34413 < 0.3 mc GCM66 R 0.26 IRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34418 < 0.2 mc GCM66 R 0.17 IRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34423 E 0.06 n GCM66 R 0.06 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34475 7.35 GCM66 R 0.030 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34488 1.05 GCM66 R 0.08 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34496 0.201 GCM66 R 0.035 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34501 E 0.021 n GCM66 R 0.024 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34506 < 0.032 b GCM66 R 0.032 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34511 < 0.040 b GCM66 R 0.04 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34516 < 0.08 b GCM66 R 0.08 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34536 < 0.048 b GCM66 R 0.048 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34541 E 0.0456 b GCM66 R 0.029 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34546 E 0.040 b GCM66 R 0.032 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34551 < 0.12 GCM66 R 0.12 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34566 < 0.030 b GCM66 R 0.03 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34571 < 0.034 b GCM66 R 0.034 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34668 E 6.40 mc GCM66 R 0.18 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34696 < 0.52 GCM66 R 0.52 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34699 < 0.09 b GCM66 R 0.09 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 34704 < 0.05 b GCM66 R 0.05 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 39175 < 0.08 b GCM66 R 0.08 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 39180 0.943 GCM66 R 0.038 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 39702 < 0.14 GCM66 R 0.14 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 49991 < 1.0 GCM66 R 1.0 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 49999 < 0.14 GCM66 R 0.14 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 50000 < 0.140 GCM66 R 0.14 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 50002 < 0.10 GCM66 R 0.10 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 50004 < 0.030 b GCM66 R 0.030 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 50005 < 0.04 b GCM66 R 0.04 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 71865 < 0.002 CL033 R 0.002 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 71870 0.094 d IC027 R 0.02 IRL USGS 340655117184005 2006-02-07 15:40 PST K WG 73547 < 0.7 b GCM66 R 0.70 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 73570 < 0.18 GCM66 R 0.18 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 75985 0.83 EEGC1 R USGS 340655117184005 2006-02-07 15:40 PST K WG 77041 < 0.038 b GCM66 R 0.038 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77093 0.986 GCM66 R 0.024 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77103 < 0.4 b GCM66 R 0.4 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77128 < 0.042 b GCM66 R 0.042 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77135 < 0.038 b GCM66 R 0.038 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77168 < 0.026 b GCM66 R 0.026 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77170 < 0.05 b GCM66 R 0.05 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77173 < 0.06 b GCM66 R 0.06 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77220 < 0.060 b GCM66 R 0.06 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77221 < 0.060 b GCM66 R 0.06 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77222 < 0.056 b GCM66 R 0.056 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77223 < 0.038 b GCM66 R 0.038 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77224 < 0.042 b GCM66 R 0.042 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77226 < 0.044 b GCM66 R 0.044 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77275 < 0.040 b GCM66 R 0.04 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77277 < 0.050 b GCM66 R 0.05 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77297 < 0.12 GCM66 R 0.12 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77342 < 0.12 GCM66 R 0.12 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77350 < 0.060 b GCM66 R 0.06 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77353 < 0.060 b GCM66 R 0.06 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77356 < 0.08 b GCM66 R 0.08 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77424 < 0.50 mc GCM66 R 0.50 IRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77443 < 0.180 GCM66 R 0.18 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77562 < 0.030 b GCM66 R 0.030 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77613 < 0.18 GCM66 R 0.18 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77651 < 0.036 b GCM66 R 0.036 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 77652 < 0.038 b GCM66 R 0.038 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 78032 < 0.10 GCM66 R 0.10 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 78109 < 0.50 mc GCM66 R 0.5 IRL USGS 340655117184005 2006-02-07 15:40 PST K WG 78133 < 0.37 b GCM66 R 0.37 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 81552 E 2.1 t GCM66 R 6 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 81555 < 0.028 b GCM66 R 0.028 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 81576 E 0.1 b GCM66 R 0.08 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 81577 < 0.10 GCM66 R 0.10 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 81593 < 0.40 GCM66 R 0.40 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 81595 < 2.0 GCM66 R 2 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 81597 < 0.20 GCM66 R 0.20 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 81607 < 1.0 GCM66 R 1.0 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 82082 -52.30 MS007 R USGS 340655117184005 2006-02-07 15:40 PST K WG 82085 -8.26 MS020 R USGS 340655117184005 2006-02-07 15:40 PST K WG 82625 < 0.510 GCM66 R 0.51 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 85795 E 0.02 t GCM66 R 0.06 LRL USGS 340655117184005 2006-02-07 15:40 PST K WG 90851 E 0.1 ALGOR R USGS 340655117184005 2006-02-07 15:40 PST K WG 90867 < 0.3 ALGOR R USGS 340655117184005 2006-02-07 15:40 PST K WG 99832 97.2 GCM66 R USGS 340655117184005 2006-02-07 15:40 PST K WG 99833 98.5 GCM66 R USGS 340655117184005 2006-02-07 15:40 PST K WG 99834 93.7 GCM66 R USGS 340655117184005 2006-02-07 15:40 PST K WG 99871 2 GCM66 R