VARNUM NAME LABEL TYPE LENGTH 1 SITE_ID ID Assigned to Each Site 2 50 2 VISIT_NO Sequential Visit Number Within Year 1 3 SAMPLED_INF "Sediment core samples (Top, Bottom) used for diatom-inferred chemistry?" 2 20 4 INDXSAMP_INF Index sample for site (YES/NO); typically visit 1) 2 3 5 PTL_INF_TOP Diatom-inferred Total Phosphorus in top core sample based on jackknifed values (ug/L) 1 6 PTL_INF_BOT Diatom-inferred Total Phosphorus in bottom core sample based on jackknifed values (ug/L) 1 7 PTL_INF_DIF Difference (Top - Bottom) in Diatom-inferred Total Phosphorus (ug/L) 1 8 PTL_SIGTEST Is PTL_INF_DIF significantly different from 0? (Yes/No) 2 3 9 NTL_INF_TOP Diatom-inferred Total Nitrogen in top core sample based on jackknifed values (ug/L) 1 10 NTL_INF_BOT Diatom-inferred Total Nitrogen in bottom core sample based on jackknifed values (ug/L) 1 11 NTL_INF_DIF Difference (Top - Bottom) in Diatom-inferred Total Nitrogen (ug/L) 1 12 NTL_SIGTEST Is NTL_INF_DIF significantly different from 0? (Yes/No) 2 3 13 CORE_CONFIDENCE Does bottom slice represent pre-disturbance conditions? (YES/NO/UNCERTAIN) 2 9 14 SAMPLED Site Sampled Code 2 30 15 SITE_TYPE PROB_Samp: Lake is from probability sample and can be used for population estimation. REF_Lake: Lake is not from probability sample and was selected as a candidate reference lake 2 10 16 LAKE_SAMP "Eval. status. _Denied (access denied). _Inaccess (physically inaccessible). _Other. _LT_4ha (< 4ha). _Shallow (< 1m deep). _Vegetated (< 1000 m2 open H2O). _Saline (tidal). Special_Purpose (aquacult., disposal, WWT, or evap.). Not_Lake (other)" 2 20 17 TNT Target:Non-target evaluation status derived from LAKE_SAMP 2 10 18 LON_DD Longitude (decimal degrees) obtained from NHD (NAD83) 1 19 LAT_DD Latitude (decimal degrees) obtained from NHD (NAD83) 1 20 ST State two letter code 2 2 21 EPA_REG EPA Region 2 9 22 AREA_CAT7 Lake area unequal probability category (7 categories) 2 10 23 NESLAKE NESLake-Lake was included in 1970s National Eutrophication Survey 2 7 24 STRATUM Probability survey design stratum. NLALake is single stratum 2 8 25 PANEL Panel_1-lake was included in base design. OverSamp-Lake was part of over sample of lakes used for replacing lakes in base design if they could not be sampled 2 8 26 DSGN_CAT Probability survey design categories used to assign unequal probability of selection 2 15 27 MDCATY Unequal selection probability for lake 1 28 WGT Initial site weight based on base design. DO NOT USE for population estimation 1 29 WGT_NLA Adjusted site weight. USE for population estimation 1 30 ADJWGT_CAT Categories used to adjust initial design weight (WGT) to account for use of over sample lakes. 2 5 31 URBAN URBAN LAKE? (YES/NO) 2 3 32 WSA_ECO3 Wadeable Stream Assessment three aggregrated Omernik level 3 ecoregions 2 6 33 WSA_ECO9 Wadeable Stream Assessment nine aggregrated Omernik level 3 ecoregions 2 3 34 ECO_LEV_3 Omernik level 3 ecoregion number 2 2 35 NUT_REG "Nutrient ecoregion, based on EPA nutrient criteria documents for lakes & reservoirs)" 2 4 36 NUTREG_NAME Nutrient ecoregion name 2 60 37 ECO_NUTA NLA Aggregate Nutrient Ecoregion 2 5 38 LAKE_ORIGIN "Lake origin (MAN-MADE, NATURAL [which includes natural lakes augmented by dams])" 2 9 39 ECO3_X_ORIGIN WSA_ECO3 x LAKE_ORIGIN CLASS 2 20 40 REF_CLUSTER NLA Reference Site Cluster (A-G) 2 1 41 RT_NLA "NLA Reference Class Assignment (REF=reference, SO-SO=intermediate, TRASH=impacted)" 2 8 42 HUC_2 Hydrologic region (2-digit) 2 2 43 HUC_8 Hydrologic region (8-digit) 2 8 44 FLAG_INFO Data qualifier flag for lake info data 2 12 45 COMMENT_INFO Comments and flag explanations for lake info data 2 160 46 SAMPLED_CORE Sediment core sample collected? 2 20 47 PTL_INF_COND T-B difference class for PTL 2 20 48 PTL_INF_COND3 T-B difference class for PTL (3 level) 2 20 49 NTL_INF_COND T-B difference class for NTL 2 20 50 NTL_INF_COND3 T-B difference class for NTL (3-level) 2 20