#TEMPORARY ACCESSION NUMBER:
#ACCESSION NUMBER:

#CONTRIBUTOR:
Leticia Colmenares

#CONTRIBUTOR INSTITUTION:
Windward Community College
45-720 Kea'ahala Road
Kaneohe, HI 96744
808-236-9120
leticia@hawaii.edu

#ORIGINATOR:
same

#ORIGINATOR INSTITUTION:
same

#TITLE: 
Windward Community College Water Quality 
Assessment Project: Enchanted Lakes Coastal Watershed 2003-2004

#ABSTRACT: 
Measurements of water quality parameters were taken by Windward
Community College faculty and students at five sites in the
Enchanted Lakes, Kailua, Oahu, Hawaii coastal watershed during 
2003-2004.  Data provided as MS Excel spreadsheets.

#PURPOSE:  
Assess the water quality of the Enchanted Lakes watershed system

#PROJECT:
MSI-NOAA Water Quality Assessment Project:Windward Community College

#FUNDING:
MSI, NOAA

#ONLINE LINK (12/2005):
http://www.wcc.hawaii.edu/water/

#LOCATION EXTREMES:
SOUTHERNMOST LATITUDE:  21.3792 
SOUTHERNMOST LATITUDE HEMISPHERE: N
NORTHERNMOST LATITUDE:  21.3950
NORTHERNMOST LATITUDE HEMISPHERE: N
WESTERNMOST LONGITUDE: 157.7425
WESTERNMOST LONGITUDE HEMISPHERE: W 
EASTERNMOST LONGITUDE: 157.7283
EASTERNMOST LONGITUDE HEMISPHERE: W  

#LOCATION KEYWORDS: 
North Pacific, Hawaii, Windward Oahu, Kailua, Enchanted Lakes

#SAMPLING STATIONS: 
see ../../data/sites/summary.txt
    ../../data/sites/EnchantedLakesmap.jpg

#BEGIN AND END DATES: 
20031120 - 20040408

#SAMPLING PERIODS:
quasi-monthly sampling

#PARAMETERS: 
Biochemical Oxygen Demand
Combined Nitrate + Nitrite
Conductivity
Dissolved Oxygen
Lead
pH
Salinity
Temperature
Total Nitrogen
Total Phosphorus
Turbidity

#METHODOLOGY:
Determination of Nitrite, Nitrate and Phosphate

Summary of Method. Water samples are filtered and analyzed by ion
chromatography (IC). Each analytical batch consists of a blank, 5 external
calibration standards and a calibration check for every 8 samples. The
method detection limits (MDL) are as follows: 0.1 mg/L for phosphate, and
0.05 mg/L for nitrite and nitrate.

Preparation of IC samples. Water samples are pre-filtered before analysis in
the Dionex ICS-90 ion chromatography system. Fresh water samples (5 mL) are
filtered through 0.20 mm IC Millex syringe filters (for freshwater samples)
while saltwater samples are filtered through the Dionex Ag/H cartridges and
diluted 50:50 using deionized distilled water.

Preparation of IC calibration standards. The following calibration standards
are prepared.
(1) 0.1 mg/L of phosphate, 0.05 mg/L of nitrite and 0.05 mg/L nitrate
(2) 0.2 mg/L phosphate and 0.1 mg/L nitrite and 0.1 mg/L nitrate
(3) 1.0 mg/L phosphate and 0.5 mg/L nitrite and 0.5 mg/L nitrate
(4) 2.0 mg/L phosphate and 1.0 mg/L nitrite and 1.0 mg/L nitrate
(5) 10.0 mg/L phosphate and 5.0 mg/L nitrite and 5.0 mg/L nitrate

Calibration. The calibration curve must consist of at least three data
points. The response of each calibrator must be within 10%, otherwise, it
does not meet method criteria and must be removed from the working
calibration curve.

Final data are summarized in Excel worksheets. The nitrite as N (mg/L) is
calculated by multiplying the nitrite (mg/L) with 0.304 (factor). Likewise,
the nitrate as N (mg/L) content is calculated by multiplying the nitrate
(mg/L) content with 0.226 (factor). The phosphate (mg/L) content is
converted to phosphorus (mg/L) by using the factor of 0.326.

Determination of Total Nitrogen and Total Phosphorus

Summary of Method. To analyze the total N and total P content, all
phosphorus-and nitrogen-containing substances in the water sample are first
converted to inorganic nitrates and phosphates by photo-oxidation. After
photo-oxidation, the samples are analyzed as described above.

Photo-oxidation. Water samples (100 mL) added with 2 drops of 30% H2O2, are
photo-oxidized using Ace-Hanovia photooxidation apparatus (Department of
Health State Laboratory) for four (4) hours to hydrolyze all
phosphorus-containing substances into phosphates, and all
nitrogen-containing substances into nitrates.

#INSTRUMENT TYPES:
Sampler bottles
ion chromatograph system (Dionex ICS-90)

#REFERENCES: 
none

#SUBMITTING MEDIUM:
email attachment

#FILE FORMATS: 
Original data file was given in MS Excel format:
../../data/updateEnchantedlakes.xls

Sample dates, locations, and units are defined in each file.
A redundant ASCII copies was made with same file
name except for a CSV (Comma Separated Version) extention.

Ancillary files:
(downloaded from http://www.wcc.hawaii.edu/water/)

directory /sites:
name                        comment
EnchantedLakesmap.jpg       map of locations
EnchantedSite0x.JPG         photograph of site (x=1-5)
sites.txt                   site description

directory /results:
name                        comment
discussion.txt              results of study
parameter.gif               plot of data, parameter varies
                            (one file for each plot)

#DATASET SIZE:
4709 Kbytes

#NUMBER OF DATA UNITS:
5 stations

#MISCELLANEOUS:
NODC
Accession  Comment
0001489:   Heeia Stream Water Quality, 2002-2003 
0002449:   Heeia Stream Water Quality, 2004-2005 

