PARAMETER	CONTAINER	PRESERVATIVE	HOLDING TIME
General, dissolved	Plastic	Filtered on site, HNO3 to pH<2	6 months
General, total	Plastic	HNO3 to pH<2	6 months
Chromium, hexavalent	Plastic	Cool 4o C	24 hours
Mercury	Plastic	HNO3 to pH<2	28 days

PARAMETER	CONTAINER	PRESERVATIVE	HOLDING TIME
Acidity	Plastic	Cool 4o C	14 days
Alkalinity	Plastic	Cool 4o C	14 days
Ammonia	Plastic	H2SO4 to pH<2, Cool 4o C	28 days
BOD	Plastic	Cool 4o C	48 hours
Bromide	Plastic	None	28 days
Chloride	Plastic	None	28 days
Chlorine	Plastic	Cool 4o C, Immediately	Analyze
Chromium, +6	Plastic	Cool 4o C	24 hours
COD	Plastic	H2SO4 to pH<2, Cool 4o C	28 days
Color	Plastic	Cool 4o C	48 hours
Conductivity	Plastic	Cool 4o C	28 days
Cyanide, Total or Amenable	Plastic	NaOH to pH>12, Cool 4o C	14 days
Cyanide, Reactive, pH 2	Plastic	NaOH to pH>12, Cool 4o C	14 days
Flash Point, Closed Cup	Glass	Cool 4o C	-
Fluoride	Plastic	None	28 days
Hardness, Total	Plastic	HNO3 to pH<2	6 months
Nitrite	Plastic	Cool 4o C	48 hours
Nitrate/Nitrite (waste water, chlorinated drinking water)	Plastic	H2SO4 to pH<2, Cool 4o C	28 days
Nitrate/Nitrite (non-chlorinated drinking water)	Plastic	H2SO4 to pH<2, Cool 4o C	14 days
Nitrate/Nitrite (non-chlorinated drinking water)	Plastic	Cool 4o C	48 hours
Nitrate/Nitrite (chlorinated drinking water)	Plastic	Cool 4o C	28 days
Oil & Grease	Glass	H2SO4 to pH<2, Cool 4o C	28 days
pH	Plastic	None	Analyze, Immediately
Phenols	Glass	H2SO4 to pH<2, Cool 4o C	28 days
Phosphorus, Ortho	Plastic	Cool 4o C	48 hours
Phosphorus, Total	Plastic	H2SO4 to pH<2, Cool 4o C	28 days
Silica	Plastic	Cool 4o C	28 days
Solids, Dissolved	Plastic	Cool 4o C	7 days
Solids, Suspended	Plastic	Cool 4o C	7 days
Solids, Total	Plastic	Cool 4o C	7 days
Solids, Settleable	Plastic	Cool 4o C	48 hours
Solids, Volatile	Plastic	Cool 4o C	7 days
Sulfate	Plastic	Cool 4o C	28 days
Sulfide	Plastic	ZnOAc + NaOH to pH>9, Cool 4o C	7 days
Sulfide, Reactive pH 2	Plastic	ZnOAc + NaOH to pH>9, Cool 4o C	7 days
Sulfite	Plastic	None	Analyze Immediately
Surfactants, MBAS	Plastic	Cool 4o C	48 hours
Turbidity	Plastic	Cool 4o C	48 hours

PARAMETER	CONTAINER	PRESERVATIVE	HOLDING TIME
HPLC Pesticides (Aldicarb / Carbonfuran)	Glass vial	1.2 mL Chloroacetic acid / vial, Cool 4o C	28 Days
EDB/DBCP	Glass vial	Cool 4o C	28 Days
Endothall	Glass	Cool 4o C	7 days extraction 1 day - analysis
Pesticides and PCBs	Glass	Na2S2O3 if Cl2 is present, Cool 4o C	7 days extraction 40 days - analysis
Petroleum Hydrocarbons, IR	Glass	H2SO4 to pH<2, Cool 4o C	28 days
Phenoxyacid Hebicides	Glass	Na2S2O3 if Cl2 is present, Cool 4o C	7 days extraction 40 days - analysis
Phthalate Esters	Glass	Na2S2O3 if Cl2 is present, Cool 4o C	7 days extraction 40 days - analysis
Polynuclear Aromatic Hydrocarbons	Glass	Na2S2O3 if Cl2 is present, Cool 4o C	7 days extraction 40 days - analysis
GC/MS Semivolatiles	Glass	Na2S2O3 if Cl2 is present, Cool 4o C	7 days extraction 40 days - analysis
Total Organic Carbon (TOC)	Plastic	H2SO4 to pH<2, Cool 4o C	28 days
Total Organic Halogens (TOX)	Glass	Na2S2O3 if Cl2 is present, H2SO4 to pH<2, Cool 4o C	28 days
Total Petroleum Hydrocarbons	Glass	Cool 4o C	7 days extraction 40 days - analysis
Volatile Organics	Glass vial	Na2S2O3 if Cl2 is present, HCl to pH<2	14 days
Volatile Aromatic Organics	Glass vial	Na2S2O3 if Cl2 is present, HCl to pH<2	14 days

General Note: Glass bottles used for most organic analyses should be amber in color.

• The sampling containers provided to you may contain small amounts of required preservative. The preservatives in common use are: 1 + 1 sulfuric acid, 1 + 2.5 nitric acid, 1 + 1 hydrochloric acid, and sodium hydroxide pellets. The referred to preservatives are strong acids and bases, and can cause burns. Use caution at all times. Please refer to the Material Safety Data Sheets enclosed for additional information. (Note: 1 + 2.5 translates to 1 part acid to 2.5 parts deionized water).

• Do not rinse the sample containers prior to use.

• Fill plastic and glass containers to approximately one inch from the top and cap tightly.

• Aqueous Samples: Fill volatile vials full (reverse meniscus) and carefully slide the septum onto the vial. Screw on the cap and check the vial for air bubbles. A properly filled vial will contain no air bubbles.

• Soil Samples: A separate 4 oz. jar is dedicated to volatile soil analysis whenever possible. The jar should be packed full with as little headspace to prevent volatilization of the analytes of interest.

• The temperature within the cooler must be maintained at 4^o C during transit to the laboratory. Please ensure that appropriate quantities of ice or ice packs are enclosed within the cooler to maintain this temperature. Unfrozen ice packs are included with the sample containers.

• Please complete the enclosed chain of custody. This is an integral component of documentation supporting any analysis performed for regulatory compliance.

• Seal the cooler with the enclosed custody seal. The custody seal demonstrates to laboratory personnel the maintenance of sample integrity during sample transportation to the laboratory.

• Although each sampling event is unique, remember to get as representative of a sample as possible. This might mean running the water for two minutes; mixing the sample prior to filling the containers; etc.