diff --git a/synoptic/L1_normalize.qmd b/synoptic/L1_normalize.qmd
index 7052e05..c9817d4 100644
--- a/synoptic/L1_normalize.qmd
+++ b/synoptic/L1_normalize.qmd
@@ -245,6 +245,23 @@ f <- function(fn, out_dir, design_table) {
                      site = dat$Site[1], 
                      logger = dat$Logger[1],
                      table = dat$Table[1])
+    
+    # The Chesapeake Bay synoptic site design overlaps with TEMPEST,
+    # and the latter's control ("C") plot functions as the former's
+    # upland plot. So if we're handling TMP C data, also write a copy
+    # as GCW UP. https://github.com/COMPASS-DOE/data-workflows/issues/116
+    if(dat$Site[1] == "TMP" && dat$Plot[1] == "C") {
+        dat$Site <- "GCW"
+        dat$Plot <- "UP"
+        message("\t--> DUPLICATING DATA TO GCW UP <--")
+        write_to_folders(dat, 
+                         root_dir = out_dir, 
+                         data_level = "L1_normalize",
+                         site = dat$Site[1], 
+                         logger = dat$Logger[1],
+                         table = dat$Table[1])
+    }
+
     rm(dat)
     
     if(params$remove_input_files) {
diff --git a/synoptic/metadata/L1_metadata/GCW.txt b/synoptic/metadata/L1_metadata/GCW.txt
index 55493b3..2b66781 100644
--- a/synoptic/metadata/L1_metadata/GCW.txt
+++ b/synoptic/metadata/L1_metadata/GCW.txt
@@ -6,6 +6,10 @@ overlaps with the TEMPEST experiment control plot. This transect spans a
 mid- to late-successional (~80 years old) temperate, deciduous coastal
 forest and a mesohaline marsh along the Rhode River in Edgewater, MD.
 
+Important note: GCW upland (UP) is the TEMPEST control (C) plot, and so the 
+data for GCW-UP in this folder are copied from (and identical to) TMP-C;
+this means they differ in some respects from the other synoptic plots' data.
+
 Contacts for the GCReW Synoptic site: 
 Stephanie J. Wilson wilsonsj@si.edu
 Pat Megonigal megonigalp@si.edu
diff --git a/synoptic/metadata/L1_metadata/L1_metadata_variables.csv b/synoptic/metadata/L1_metadata/L1_metadata_variables.csv
index fdc76df..bdbd9dc 100644
--- a/synoptic/metadata/L1_metadata/L1_metadata_variables.csv
+++ b/synoptic/metadata/L1_metadata/L1_metadata_variables.csv
@@ -19,7 +19,7 @@ WaterLevel,Barometric_Pressure600,gw_bar_pressure,,,x * 1,,,
 WaterLevel,Temperature600,gw_temperature,degC,degC,x * 1,-5,50,Groundwater temperature
 WaterLevel,Temperature_Int600,gw_temperature_int,degC,degC,x * 1,-5,50,
 WaterLevel,Actual_Conductivity600,gw_act_cond,μS/cm,μS/cm,x * 1,,,
-WaterLevel,Specific_Conductivity600,gw_conductivity,uS/cm,uS/cm,x * 1,0,350000,Groundwater specific conductivity
+WaterLevel,Specific_Conductivity600,gw_spec_cond,uS/cm,uS/cm,x * 1,0,350000,Groundwater specific conductivity
 WaterLevel,Salinity600,gw_salinity,PSU,PSU,x * 1,0,350,Groundwater salinity
 WaterLevel,TDS600,gw_tds,,,x * 1,,,
 WaterLevel,Water_Density600,gw_density,g/cm3,g/cm3,x * 1,0.98,1.05,Groundwater density