Field Sampling Procedures for 

Fuel and Motor Oil Quality 

Testing 

A Handbook for Use by Fuel and Oil 

Quality Regulatory Officials 

This publication is available free of charge from: 

http://dx.doi.org/10.6028/NIST.HB.158 

NIST Handbook 158 

2016
INSIDE FRONT COVER - BLANK
 
 

 

 

 

NIST Handbook 158 

2016 Edition 

FIELD SAMPLING PROCEDURES 

FOR FUEL AND MOTOR OIL 

QUALITY TESTING 

A HANDBOOK FOR USE BY FUEL AND OIL QUALITY 

REGULATORY OFFICIALS 

Editor: 

Kenneth Butcher 

Linda Crown 

David Sefcik 

Lisa Warfield 

Office of Weights and Measures 

Physical Measurements Laboratory 

Carol Hockert, Chief 

Office of Weights and Measures 

Physical Measurements Laboratory 

This publication is available free of charge from: 

http://dx.doi.org/10.6028/NIST.HB.158 

April 2016 

U.S. Department of Commerce Penny 

Pritzker, Secretary 

National Institute of Standards and Technology Willie 

May, Under Secretary of Commerce for Standards and Technology and Director 
 

 

Certain commercial entities, equipment, or materials may be identified in this document in order to describe an 

experimental procedure or concept adequately. Such identification is not intended to imply recommendation or 

endorsement by the National Institute of Standards and Technology, nor is it intended to imply that the entities, 

materials, or equipment are necessarily the best available for the purpose. 

National Institute of Standards and Technology Handbook 158, 2016 Edition
 

Natl. Inst. Stand. Technol. Handb. 158, 2016 Ed., 68 pages (April 2016)
 

CODEN: NIHAE2
 
 

 

 

NIST Handbook 158 (2016) Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

ACKNOWLEDGEMENTS 

The staff of the Office of Weights and Measures of the National Institute of Standards and 

Technology expresses sincere appreciation to the remarkable program directors, field officials, 

laboratory staff and other personnel from the States of California, Colorado, Georgia, Missouri, 

North Carolina and Virginia who shared their expertise, enthusiasm, knowledge and technical 

resources to make this handbook possible. 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

Table of Contents
 

ACKNOWLEDGEMENTS ..................................................................................................................................... iii
 

I. PURPOSE AND SCOPE ..............................................................................................................................1
 

II. TERMINOLOGY..........................................................................................................................................1
 

A. Chain-of-Evidence (custody) .......................................................................................................................1
 

B. Sample .........................................................................................................................................................1
 

C. Sampled Lot.................................................................................................................................................2
 

III. SAFETY AND ENVIRONMENT................................................................................................................2
 

A. Awareness....................................................................................................................................................2
 

B. Safety Data Sheet (SDS)..............................................................................................................................3
 

C.	 Static Electricity...........................................................................................................................................3
 

D.	 Personal Protective Equipment....................................................................................................................4
 

E.	 Other Safety and Accessory Equipment ......................................................................................................4
 

F.	 Vehicle and Sample Case Markings for Hazardous Materials Transportation – Alerting Emergency
 

Responders...................................................................................................................................................5
 

G.	 Safety and Health Checklist and Periodic Review.......................................................................................6
 

H.	 Training .......................................................................................................................................................7
 

IV.	 SAMPLING PROCEDURE OVERVIEW..................................................................................................7
 

A. Data..............................................................................................................................................................8
 

B. Instruments and Sampling Equipment .........................................................................................................8
 

C. Sampling Procedures ...................................................................................................................................8
 

V. FUEL SAMPLING........................................................................................................................................8
 

A. Types of Manual Sampling..........................................................................................................................9
 

B. Samplers ......................................................................................................................................................9
 

C. Fuel Sample Containers.............................................................................................................................15
 

D. Washing and Drying Sample Containers (one example) ...........................................................................18
 

E. Capacities...................................................................................................................................................19
 

F. Identifying Samples for Traceability .........................................................................................................19
 

G. Sample Transport Cases.............................................................................................................................20
 

I. Security Seals for Containers and Boxes ...................................................................................................21
 

J. Recommended Sampling Equipment - Nozzle Extender.............................................................................21
 

VI.	 SAMPLING PROCEDURE FOR TAKING FUEL SAMPLES AT RETAIL FUELING
 

LOCATIONS...............................................................................................................................................22
 

A. Preparation.................................................................................................................................................22
 

B. Sample and Containers ..............................................................................................................................24
 

C. Sampling....................................................................................................................................................26
 

D. Protecting Fuel Samples ............................................................................................................................31
 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing	 NIST Handbook 158 (2016) 

E. Visual Inspection – (Per ASTM D6751 and ASTM D4814-09b - 6. Workmanship)................................32
 

F. Transporting Samples to Laboratory .........................................................................................................34
 

G. Chain of Evidence (Custody) and Transfer................................................................................................34
 

H. Timeliness of Samples...............................................................................................................................34
 

I. Respond to Test Results – Time is of the Essence.....................................................................................34
 

VII.	 TESTING FOR WATER IN A FUEL STORAGE TANK ......................................................................36
 

A. Storage Tanks ............................................................................................................................................36
 

VIII.	 LABELING ENFORCEMENT CHECKLIST AND SAMPLING PROCEDURE OUTLINE FOR
 

TAKING SAMPLES OF MOTOR OIL AT SERVICE LOCATIONS..................................................38
 

A. Preparation.................................................................................................................................................38
 

B. Labeling and Documentation.....................................................................................................................39
 

C. Payment for Samples .................................................................................................................................44
 

D. Taking Oil Samples ...................................................................................................................................45
 

APPENDIX A. – MONTHLY SAFETY AND HEALTH EQUIPMENT CHECKLIST ................................. A-1
 

APPENDIX B. – EXAMPLES OF FUEL SAMPLING AND CHAIN-OF-CUSTODY REPORTS ................B-1
 

APPENDIX C. – EXAMPLES OF NOTICE OF VIOLATION AND STOP SALE REPORTS.................... C-1
 

APPENDIX D. – REFERENCES AND ACKNOWLEDGMENTS .................................................................. D-1
 

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NIST Handbook 158 (2016) Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

I. PURPOSE AND SCOPE 

Fuel and motor oil quality programs are implemented to provide an official presence in the marketplace and to verify 

that sellers of engine fuels and motor oils have control systems in place which ensure the products they sell conform 

to the quality specifications in federal and state laws and regulations. Routine, unannounced verification of fuel and 

motor oil quality enables the programs to identify sellers and their suppliers who have quality control systems in place 

and to focus enforcement resources on those who do not. This handbook outlines how samples are to be taken, 

identified, protected and transported to a laboratory for testing. It also provides information on safety and sampling 

equipment and includes illustrations of the equipment and forms described in the text. 

NOTE: This handbook only covers the sampling of products stored at or near atmospheric pressure. 

For instance, the procedures for sampling fuels stored under pressure (e.g., LPG & CNG) are not 

included. 

II. TERMINOLOGY 

A. Chain-of-Evidence (custody) 

A record keeping system documenting the history of the collection, movement, storage location(s), custody 

(who possessed or controlled it), and other conditions (e.g., environmental and storage conditions, if critical to 

protecting the product) of a sample from the time it was obtained to the time it is accepted and logged into the 

laboratory management system for testing. See ASTM D4840 “Standard Guide for Sample Chain-of-Custody 

Procedures” for more information. 

B. Sample 

An amount of fuel or motor oil taken from a storage tank or dispenser that is representative of a larger amount 

of product. A majority of the samples collected are classified as either “open,” “routine,” or “regular” samples 

which means they are periodically collected through “announced” inspection visits (that is the official identifies 

his or her self and notifies the seller that an inspection will be made and samples collected). A sample collected 

specifically in response to a complaint can be taken after announcing the purpose of the visit or as an 

unannounced or “undercover” investigation. References to other names for samples are mentioned in the 

section on sampling but those terms (i.e., nozzle sample versus bottom sample) only refer to the point of 

collection of the sample and should not be confused with this definition. 

Complaint/Undercover Investigation Sample: The collection of a sample(s) of the product(s) in question 

without announcing its collection to the station operator/owner. This can be done by means of a "trap tank" 

in an undercover vehicle or by purchasing the product and putting it in an Underwriters Laboratory or 

Factory Mutual listed, approved container. 

User Collected Sample: A sample that was not collected by a regulatory official following the prescribed 

sampling procedures. This sample can be tested but no immediate enforcement action can be taken on 

negative results because the sample may have been contaminated or mishandled by the user. However, 

the test results may indicate the need to take an official sample. 

NOTE: Evidence is something that tends to prove or disprove the existence of an alleged fact. A 

sample is “evidence” (and must be treated as such) but, it is typically called a “sample.” A sample 

that is not collected in accordance with prescribed procedures, or which has an undocumented 

chain of custody, will have little chance of being admitted as evidence in legal proceedings. 

NOTE: For evidentiary purposes the collection of samples and related activities should be noted 

and documented either on paper or in digital data systems (these systems are acceptable for use 

only if there is a real-time continuous data back-up in operation and the data is maintained on a 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing NIST Handbook 158 (2016) 

remote server) and all documents should bear the seal of the state or local authority as well as the 

identity of the agency collecting the sample. On each official document there should be a space for 

the placement of an official’s signature of attestation or execution along with the individual’s title 

and date of signing. Notes about an inspection should answer the questions who, what, when, 

where, why and how. This documentation allows for an independent evaluation of the work 

conducted and will allow an official to refresh his or her memory should he or she be asked to 

testify about an inspection at a later time. 

C. Sampled Lot 

The amount of fuel or motor oil represented by a particular sample (i.e., the volume of product in the storage 

tank). 

III. SAFETY AND ENVIRONMENT 

The procedures in this handbook require the handling of harmful and flammable materials in 

hazardous work locations. This handbook cannot encompass all of the dangers that may be 

present while taking fuel and motor oil samples. Officials must identify and comply with the 

health and safety practices for each work location, following all notices and local requirements. 

Both short term and long term effects can impact health so being proactive is essential. 

The safety and physical well-being of officials and other individuals at the site is the first priority. This handbook 

does not address all of the safety issues that need to be considered before collecting samples. It is the official’s duty 

to obey the safety rules in effect in the work environment in which samples are collected and to seek out advice and 

training on good working practices. Officials must work safely so that their actions do not harm others. Collecting 

samples requires working in hazardous environments with dangerous materials, which means that even a minor 

incident could result in serious injury or death. Samples should never be transported in the passenger compartment 

of a vehicle. Samples must be transported in closed metal boxes designed to contain a spill when secured in the trunk 

of a car, pickup or van should an accident occur. Never smoke or allow open flames around a vehicle used to transport 

samples. 

A. Awareness 

The best safety tools are the senses of sight, smell, and hearing, and they should be used throughout the 

collection process to alert the official of potential dangers. The traits of vanity, apathy, and laziness have 

resulted in many injuries while common sense, patience, and safe work habits help to avoid them. Obtain and 

use available Personal Protective Equipment (PPE) regardless of appearance, such as safety glasses, fuel and 

oil resistant gloves, bright orange or yellow safety vests or respirators . The job of sampling these products 

increases the frequency of exposure to the inhalation of harmful fumes; and fuel splashes or spills may 

contaminate clothing, result in flash fires, or cause other hazards such as slippery walking and climbing 

surfaces. (Note: It is a good idea to carry a change of clothing in case clothes do get soaked with fuel or motor 

oil). In retail locations for example, there is the added danger of vehicular traffic and exposure to accidents 

caused by careless or distracted motorists or customers who may disregard safety rules and endanger others. 

No sample is worth an injury. Follow safety protocols and stop sampling immediately if safety cannot be 

controlled in the work environment. When working alone, extra precaution should be taken, such as advising 

the business personnel about the work that is being done and reminding them of their responsibility to ensure a 

safe working environment for those present on their property. 

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NIST Handbook 158 (2016) Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

B. Safety Data Sheet (SDS) 

Read the SDS for each type of fuel (e.g., gasoline, gasohol, kerosene, E-85, diesel, marine fuel, aviation fuel) 

or motor oil that is sampled and periodically review (e.g., every six months) updated SDSs to learn new 

information on the product. 

NOTE: To learn more see the American Petroleum Institute’s “Safety Data Sheets: Petroleum 

Industry Practices” at this URL: 

http://www.api.org/~/media/Files/EHS/Health_Safety/SDS_Petroleum_Industry_Practices_Feb2009.pdf). 

Additional information is available from OSHA at: 

https://www.osha.gov/Publications/HazComm_QuickCard_SafetyData.html and information on Safety 

Data Sheets is available at: https://www.osha.gov/Publications/OSHA3514.html 

A detailed explanation of hazardous pictograms and symbols is available from OSHA at:
 

https://www.osha.gov/Publications/OSHA3636.pdf
 

C. Static Electricity 

The movement or separation of materials, including liquids, generates static electricity. When these materials 

are different, such as when fuel moves through a nozzle or a piece of clothing is separated from a car seat as a 

driver leaves the seat of a car, there is often a transfer of free electrons. If either or both of the materials are 

poor conductors, the potential for a static discharge can build as one material becomes negative and the other 

positive, depending on which accumulates excess electrons. When there is no bond or ground in place to 

dissipate the charges, the voltage builds and the static electricity seeks an outlet. High humidity does not 

prevent static electricity, and lightning, the strongest example of static electricity, is common during rainstorms. 

Never underestimate the danger posed by static electricity when taking samples. Even though a specific fuel 

and air combination must be present for a spark to cause ignition, those conditions cannot be measured with 

the senses. Think and act as if a very hazardous situation exists whenever carrying out the tasks described in 

this handbook. Study and use good grounding practices and bonding equipment, noting that nothing completely 

eliminates the hazard presented by the accumulation of static electricity, which can build up rapidly for a wide 

variety of reasons in different sources (e.g., on clothing or the flow of fuel from the nozzle into a sampling 

container). Before pouring fuel into another container or from a nozzle into a container, be sure they are bonded 

or grounded to each other. For example, place the nozzle against the opening of the container and insert it as 

deep as possible (use a fill tube if available) to reduce splash filling and to maintain a smooth flow so that 

droplets do not form. Remember to ground equipment in accordance with the instructions of the manufacturer. 

Sampling procedures can introduce spark promoters into storage tanks or transport compartments so extra 

caution, good grounding procedures and special non-sparking equipment and tools, must be used (e.g., cords 

made from synthetic materials such as nylon could cause charges as it rubs against a glove or other objects). 

When working around rusted steel, a spark hazard can be created if equipment made of aluminum or magnesium 

is used. 

Be aware of the notices placed on and around dispensers and ensure compliance with any warnings (e.g., such 

as not filling a container while it is sitting on a plastic bed liner or while it is in an enclosed space such as the 

trunk of a car). After getting out of a vehicle, touch a metal part of the dispenser housing to discharge any 

electrostatic charge before going to the dispenser island. 

Do not take samples during hail and thunderstorms or when lightning is observed. 

Do not take samples from a dispenser connected to a storage tank being filled by a tanker truck because the 

filling process generates an electrostatic charge. Wait for 30 minutes after the delivery is completed before 

sampling from the tank or opening its fill ports. 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing	 NIST Handbook 158 (2016) 

It is a good habit to ground the static charge on one’s body by touching a metal part of the dispenser or support 

structure of a tank before taking a sample. On tanks and drums, touch the structure at a point at least 1 m (39 

in) away from an opening. 

NOTE: To learn more about static electricity as it relates to fuels, visit the Petroleum Equipment Institute’s 

“Stop Static” URL at http://www.pei.org/static Also view the U.S. Chemical Safety and Hazard Investigation 

Board’s video on one static caused explosion of non-conductive liquids to understand why reviewing SDSs 

periodically is essential: https://www.youtube.com/watch?v=tVZzdtnZaJk (see also: 

https://www.speedway.com/About/FuelSafety). 

D. Personal Protective Equipment 

1.	 Clothing: Outer garments should be made from anti-static materials such as cotton (avoid wool and 

synthetics which, when moving against each other, can rapidly build up static charges). The color of the 

clothing should be suitable for the working environment and brightly colored or covered with a vest with 

light reflecting elements that conform to the Class 2 or 3 requirements in the latest edition of 

ANSI/ISEA 107 “High-Visibility Safety Apparel and Headwear.”1 This type of high-visibility safety 

apparel alerts motorists and other equipment operators to an official’s presence in high traffic areas around 

fuel dispensers and storage tanks. 

2.	 Shoes: Steel toed shoes or boots manufactured to be static dissipative and slip resistant with oil/gas 

resistant soles should be worn. Footwear capable of causing sparks should not be worn. 

3.	 Eye/Face Protection: Safety glasses or goggles should be worn whenever samples are handled and 

especially during collection where splashing or spraying could occur. 

4.	 Skin: Avoid skin contact with all fuels, oils and other chemicals. Hand protection should be worn 

whenever handling samples. Gloves should be made of Nitrile2, or coated with Neoprene or Tychem2. 

Materials such as Nitrile2 offer chemical resistance, are considered to be strong disposable gloves, and are 

generally safe for people who are allergic to latex. PVC-coated gloves are recommended for use with 

biodiesel. 

5.	 Toxic Materials: Avoid breathing toxic vapors. When fuel, oil vapors or mists are present, wear a 

National Institute for Occupational Safety and Health (NIOSH) – approved organic vapor/mist respirator 

and maintain it in accordance with the manufacturer’s instructions. 

E. Other Safety and Accessory Equipment 

1.	 Eye Wash: Portable eye wash station or emergency eye flush solution kit (e.g., Eyesaline2 or equivalent). 

2. Flashlight: Use an explosion proof flashlight, Class I Division 1 C&D, Class I Division 2 A, B, C, D, 

Class II Division 2 G, T3C Operating Temperature. 

3.	 Tools: Set of non-sparking tools (including screwdrivers, adjustable wrenches, hammer and pry tools). 

4.	 Traffic Cones: Four or more – 90 cm (36 in) fluorescent traffic cones (for blocking sampling area and 

tank openings). 

1 This ANSI Standard “High-Visibility Safety Apparel and Headwear (ANSI/ISEA 107-2010) was established by American 

National Standards Institute (http://ansi.org/) and the International Safety Equipment Association 

(http://www.safetyequipment.org/). Officials and other workers are routinely exposed to the hazards of low visibility while on the 

job. This standard provides guidelines for the selection and use of high-visibility safety apparel such as shirts, rainwear, outerwear, 

safety vests and headwear to improve worker visibility during the day, in low-light conditions, and also at night. 

2 NOTICE: The mention of trade or brand names does not imply endorsement or recommendation by the U.S. Department of 

Commerce over similar products which provide equivalent or better protection that may be available from other manufacturers. 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

5.	 Fire Extinguishers: 

a.	 Fire Extinguisher 5 kg (10 lb) or larger: B type extinguishers are best suited for petroleum fires but 

a multi-purpose fire extinguisher labeled A, B, C or any combination of those letters is recommended 

since any type of fire may be encountered. Assure that portable fire extinguishers with current, valid 

inspection dates are maintained in a fully charged and operable condition and kept in their designated 

places at all times except during use. 

b.	 Foam extinguishers for samples with more than 10 % ethanol by volume: AR Foam Fire 

Extinguisher – 6 L (2.5 gal): When the ethanol content of fuels is E10 or higher, an Alcohol Resistant 

(AR) foam must be used on gasoline fires as traditional AFFF foams have minimal effect. 

6.	 First Aid: A first aid kit that meets or exceeds American National Standard (ANSI) Z308.1-1998 

"Minimum Requirements for Workplace First-aid Kits." 

7.	 Fuel Containers: 9.4 L to 19 L (2.5 gal to 5 gal) capacity metal fuel containers. These are used to hold 

fuel from nozzle flushes and to obtain undercover samples, and these must conform to “7-29 - Ignitable 

Liquid Storage in Portable Containers” from Factory Mutual - Global Property Loss Prevention Data 

Sheets and Underwriters Laboratory # 30 “Standard for Metal Safety Cans.” These requirements cover 

metal safety cans that have nominal capacities of 19 L (5 gal) or less and that are primarily intended to 

store and handle flammable and combustible liquids, such as gasoline, naphtha, kerosene, acetone, MEK, 

and similar liquids in accordance with the Flammable and Combustible Liquids Code, NFPA 30. 

8.	 Digital Evidence Data: Digital camera that is waterproof and shock resistant with GPS and wireless 

functions. This is for use in collecting photographic evidence such as signs, device markings, totalizer 

indications and other information. 

9.	 Spill Clean-Up Materials 

a.	 “Fuel/Oil Spill Kit”: Kit is used to contain, clean up, and dispose of spilled liquids such as water, 

oil, and chemicals. Spill kits typically include absorbent products (such as socks, pillows, and pads), 

a disposal bag, a steel self-closeable container for storage, and absorbent wipes for cleaning up spills. 

b.	 Wiping Cloths: Lint free wiping cloths or disposable wipes for wiping down sample containers and 

tools. Vehicles should be equipped with a self-closing steel trash can, stored outside the driver 

compartment, and used to hold disposable rags and wipes. 

F.	 Vehicle and Sample Case Markings for Hazardous Materials Transportation – Alerting Emergency 

Responders 

1.	 Vehicles: A vehicle used to transport limited quantities of hazardous material (less than 454 kg [1001 lb] 

aggregate gross weight) is not required to display hazardous material placards under U.S. Department of 

Transportation Hazardous Material Regulations. However, under that regulation, voluntary placarding is 

permitted to alert emergency responders that the vehicle’s cargo compartment may contain containers of 

flammable or combustible liquids. This information may be valuable in case the vehicle is involved in an 

accident or other emergency. 

For the exemption see: 49 CFR §172.504 “General Placarding Requirements.” 

(c) Exception for less than 454 kg (1,001 pounds). Except for bulk packagings and 

hazardous materials subject to §172.505, when hazardous materials covered by table 2 of 

this section are transported by highway, placards are not required on (1) A transport 

vehicle which contains less than 454 kg (1001 pounds) aggregate gross weight of 

hazardous materials covered by table 2 of paragraph (e) of this section; The exceptions 

provided in paragraph (c) of this section do not prohibit the display of placards in the 

manner prescribed in this subpart, if not otherwise prohibited (see §172.502), on transport 

vehicles which are not required to be placarded. 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing	 NIST Handbook 158 (2016) 

2.	 Sample Cases: When “limited quantities” of flammable liquids are contained in carrying cases or shipping 

cartons, other exceptions and labeling requirements apply. Under this exemption, officials are permitted 

to transport Class 3 Flammable and Combustible Liquids without a special driver’s license and shipping 

papers are not required. However, individual container capacity must not exceed certain limits (for Packing 

Group II it is 1 L (0.3 gal) and carrying cases and shipping cartons must be labeled with a “limited 

quantities” placard which conforms to 49 CFR 172.315 such as shown below: 

For the exemption see: 49 CFR §173.150 Exceptions for (Limited Quantities) of Class 3 (Flammable and 

Combustible Liquids). 

§173.150 Exceptions for Class 3 (flammable and combustible liquids). 

(a) General. Exceptions for hazardous materials shipments in the following paragraphs are 

permitted only if this section is referenced for the specific hazardous material in the §172.101 

Table of this subchapter. 

(b) Limited quantities. Limited quantities of flammable liquids (Class 3) and combustible 

liquids are excepted from labeling requirements, unless the material is offered for 

transportation or transported by aircraft, and are excepted from the specification packaging 

requirements of this subchapter when packaged in combination packagings according to this 

paragraph. A limited quantity package that conforms to the provisions of this section is not 

subject to the shipping paper requirements of subpart C of part 172 of this subchapter, unless 

the material meets the definition of a hazardous substance, hazardous waste, marine 

pollutant, or is offered for transportation and transported by aircraft or vessel, and is eligible 

for the exceptions provided in §173.156 of this part. In addition, shipments of limited 

quantities are not subject to subpart F (Placarding) of part 172 of this subchapter. Each 

package must conform to the packaging requirements of subpart B of this part and may not 

exceed 30 kg (66 pounds) gross weight. Except for transportation by aircraft, the following 

combination packagings are authorized: (1) For flammable liquids in Packing Group I, inner 

packagings not over 0.5 L (0.1 gallon) net capacity each, packed in a strong outer packaging; 

(2) For flammable liquids in Packing Group II, inner packagings not over 1.0 L (0.3 gallons) 

net capacity each, packed in a strong outer packaging. (3) For flammable liquids in Packing 

Group III and combustible liquids, inner packagings not over 5.0 L (1.3 gallons) net capacity 

each, packed in a strong outer packaging. 

Reference: Find the latest version of these regulations at Code of Federal Regulations at: 

http://www.ecfr.gov. 

G. Safety and Health Checklist and Periodic Review 

Reorder replacement supplies immediately after use so adequate supplies are available to do the job. Also, 

during the first week of each month, safety and health related supplies should be inventoried and inspected to 

ensure that they are undamaged, any expiration of use dates are current and that equipment is ready for use. By 

setting a specific time to do the inspection, it will become a habit. Anticipate the need for replacement supplies 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

so that they can be ordered to allow ample time to obtain them and have them delivered. A sample checklist 

for inspecting safety and health equipment is presented in Appendix A. “Safety and Health Equipment 

Checklist.” 

H. Training 

Prior to performing any sampling activities, officials should attend training courses or webinars in these 

subjects: 

1.	 Fire Extinguishers: Use of fire extinguishers in fighting fires (a live fire demonstration is recommended). 

For example see: Fire Extinguisher Training at http://emergency.yale.edu/sites/default/files/files/TMSFire-Extinguisher-Training.pdf 

2.	 U.S. Department of Labor: Occupational Safety and Health Administration (OSHA) Training on 

Flammable and Combustible Materials and Emergency spill response including how to clean up small 

spills. 

For example see: OSHA Flammable Liquids at 

https://www.osha.gov/dte/library/flammable_liquids/flammable_liquids.html 

For example see: How Fire Departments Respond to Small Fuel Spills - Self Study at 

https://www.pca.state.mn.us/sites/default/files/c-er4-05.pdf 

3.	 Ladder Safety: Sometimes climbing may be required to obtain samples, so courses on ladder safety and 

cargo tanker safety are recommended. 

For example see: Ladder Safety - Self Study at http://www.laddersafetytraining.org/ and Climbing on 

Tankers at http://www.cargotanksafety.org/wpcontent/uploads/2014/03/ctrmctrailerclimbingtrainingoutline3-28-2011-110330091455-phpapp02.pdf 

4.	 First Aid Training: This is required under OSHA First Aid Standard 29 CFR 1910.151 which requires 

that in the absence of an infirmary, clinic or hospital in close proximity to the workplace, a person or 

persons shall be adequately trained to render first aid. The First Aid, CPR, and AED Training must 

conform to OSHA First Aid Standard 29 CFR 1910.151 and should be provided by an instructor certified 

by the National Safety Council. 

For example, see First Aid OSHA Compliance Training at http://www.nsc.org/learn/SafetyTraining/Pages/first-aid-train-your-employees.aspx 

5.	 Driver Training: It is recommended that officials take an on-line or self-study Professional Truck Driver 

training course by the National Safety Council. The training covers defensive driving techniques to help 

avoid collisions, injuries and violations, and teaches personal responsibility for driving decisions. 

For example see: Professional Truck Driver Defensive Driving Course at 

http://www.nsc.org/learn/Safety-Training/Pages/professional-truck-driver-training.aspx 

6.	 Other Training Resources: https://www.osha.gov/dte/library/index.html 

7.	 OSHA Laboratory Safety Guidance: 

https://www.osha.gov/Publications/laboratory/OSHA3404laboratory-safety-guidance.pdf 

IV. SAMPLING PROCEDURE OVERVIEW 

Specific quality assurance guidelines must be established within every fuel or motor oil inspection program to facilitate 

the implementation of a sampling program. However, the following general quality assurance procedures apply: 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing	 NIST Handbook 158 (2016) 

A. Data 

All data must be documented on standardized primary inspection reports and sample collection worksheets or 

entered into a digital equivalent. 

B. Instruments and Sampling Equipment 

All instruments and sampling equipment must be operated in accordance with the operating instructions 

supplied by the manufacturer, unless otherwise specified in the work plan. Equipment checkout and calibration 

activities must occur prior to sampling/operation and they must be documented. 

C. Sampling Procedures 

Sampling procedures should be identical to those used by the Environmental Protection Agency (see 40 CFR 

80.8) to collect samples of gasoline, diesel fuel, blendstocks, fuel additives, and renewable fuels for purposes 

of determining compliance with applicable laws and regulations. 

1.	 Manual Sampling: Manual sampling of retail/wholesale fuel dispensers and storage tanks shall be 

performed according to the applicable procedures specified in the latest edition of ASTM International 

(ASTM) D4057 “Standard Practice for Manual Sampling of Petroleum and Petroleum Products.” 

2.	 Automatic Sampling (not addressed in this handbook): Automatic sampling of petroleum products in 

pipelines shall be performed according to the applicable procedures specified in the latest edition of ASTM 

D4177 “Standard Practice for Automatic Sampling of Petroleum and Petroleum Products.” 

3.	 Sampling and Sample Handling for Volatility Measurement: Samples to be analyzed for Reid Vapor 

Pressure (RVP) shall be collected and handled according to the applicable procedures specified in the latest 

edition of ASTM D5842 “Standard Practice for Sampling and Handling of Fuels for Volatility 

Measurement.” 

4.	 Sample Compositing: Composite samples shall be prepared using the applicable procedures specified in 

ASTM D5854 “Standard Practice for Mixing and Handling of Liquid Samples of Petroleum and Petroleum 

Products.” 

5.	 Sampling Plans: The collection of fuel and motor oil samples should be carried out under a directed work 

plan that ensures that these products are subject to periodic verification throughout the jurisdiction. 

Sampling is typically carried out without advance notice so there is no opportunity for the seller to alter 

either the product or labeling on the dispensing device. Variances from a plan are permitted (e.g., when 

new installations or new sellers or suppliers enter a marketplace). Increased frequency of inspections can 

be initiated on sellers whose products fail, but this decision should be based on the circumstances of each 

failure and should not be an automatic response. For example, if the cause of the failure was due to the 

mis-drop of a product by a new or part-time truck driver, then the likelihood of a repeat of this type of error 

is much less and may not merit a diversion of inspection resources. That is especially true if corrective 

actions and preventative measures are taken by the delivery company and seller. 

V. FUEL SAMPLING 

A sample is a small amount of fuel taken from a storage tank or dispenser that is representative of a larger amount of 

fuel. The sample will be tested to determine if the fuel quality is in compliance with fuel quality standards. Sampling 

can be done manually or automatically with automatic systems. This handbook only addresses manual sampling. 

There are many “types” of samples defined by the location in a tank from where they are collected. 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

A. Types of Manual Sampling 

1.	 Nozzle/Outlet Sampling: Taking a sample from the outlet nozzle of a fuel dispenser or pump. This is the 

most common type of sample taken by officials. It is presumed to be representative of the fuel sold to 

consumers through all of the dispensers piped to the same storage tank. 

Tank Sampling Positions 

When there is a need to collect a sample from a storage tank, a weighted bottle is used to collect the 

following samples from various levels of fuel in the tank: 

Top Sample: A sample taken 152 mm (6 in) below the top level of fuel. 

Upper Sample: A sample taken from the middle of the top third level of fuel. 

Middle Sample: A sample taken from the middle level of fuel (or a level halfway between the upper and 

lower sampling points). 

Lower Sample: A sample taken from the middle of the bottom third level of fuel. 

Bottom Sample: A sample taken on the bottom of a tank. 

2.	 All-Level Sample (sometimes called a “composition sample”): A sample taken by submerging a closedweighted bottle sampler to a point as near as possible to a tank’s outlet point. The sampler is then opened 

and raised at a constant rate so that it is between 70 % and 80 % full when it emerges from the top level of 

fuel. 

3.	 Average Sample: A sample consisting of proportionate parts from all levels of the fuel (e.g., an average 

sample from a horizontal, cylindrical, or a spherical tank should contain more material from the middle of 

the tank where the diameter is greatest.) 

B. Samplers 

The most frequently used containers for collecting fuel samples from retail engine fuel dispensers are clear or 

amber glass bottles (PVC coated safety bottles that reduce spills if broken are available) or metal cans such as 

shown below. Typically, samples used for quality testing at the wholesale level are taken from storage tanks 

and tank trucks. There are also times when samples must be taken from bulk storage as part of an investigation 

or follow-up to a consumer complaint. The safe collection of a representative sample should be the criteria for 

selecting sample locations. A representative sample can be collected using techniques or equipment designed 

for obtaining fuels from various fuel depths. The structure and characteristics of some storage tanks present 

access problems with collection of samples from more than one location; therefore, the selection of sampling 

devices is an important consideration. Depending on the type of storage vessel, the official can choose a bacon 

bomb sampler, subsurface grab sampler, or a glass thief to collect the sample. Other custom-made samplers 

may be used depending on the specific application. Sometimes samples are taken from fuel storage tanks, 

tanker trucks and even barges. To collect samples from these sources, specialized fuel sampling equipment 

must be used. These include a weighted bottle (see Figure 1), a submerged sampler or bacon-bomb thief (see 

Figures 2, 3, and 5), and tank and drum thieves (see Figures 4 and 6). There are many other types of sampling 

equipment of many different designs so the following are only examples of a few of the different tools available 

to the official for use in fuel sampling. The drop line and other lines used on samplers is 100 % cotton rope 

with a brass end hook for attaching the rope to the sampler. 

NOTE: If a sampler is used to take the fuel sample for microbiological testing, it must be cleaned and sterilized 

prior to use. 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing NIST Handbook 158 (2016) 

Figure 1. A Weighted Bottle for use in sampling Stationary Tanks and Tanker Trucks.
 

Photo courtesy of Chevron Products Company and the California Division of Measurement Standards.
 

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NIST Handbook 158 (2016) Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

Figure 2. Weighted Sampling Bottle. 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing NIST Handbook 158 (2016) 

Figure 3. Bacon Bomb Thief. Figure 4. Tank Thief Sampler. 

Photo courtesy of the Missouri Department

Agriculture. 

 of 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

Figure 5. Submerged Samplers (Bacon Bomb Thieves) of 

Different Capacities. 

Figure 6. Drum Thief. 

Photo courtsey of Koehler Instruments (2015) 

1.	 Weighted Bottle Sampler: The weighted bottle sampler (see Figures 1 and 2) consists of a bottle 

permanently attached to a base. (Some of these types of samplers use a copper cylinder or beaker.) A drop 

cord is attached to the handle through a ring in the stopper so that a short, quick pull on the cord opens the 

bottle at any desired point beneath the surface of the liquid. This sampler is used to take an upper, middle, 

lower, or all-level sample of liquid product. It is used for sampling tanker or barge compartments, shoretanks, tank cars, and tank trucks. 

Typical Procedures for Taking an All-Level Sample Using a Weighted Bottle Sampler: 

NOTE: To ground a static buildup the person taking the sample should touch the tank at a point not less 

than 1 m (39 in) away from the sampling opening before starting the sampling process. 

Recommended Steps: Place an appropriate disposable fuel/oil spill pad (sometimes called a “soaker pad”) 

next to the tank sampling point. 

NOTE: Fill the sampler with fuel and drain it completely before taking a sample. 

a.	 Assemble the weighted bottle sampler and open the tank access port. 

b.	 If the weighted bottle sampler is to be used to obtain samples at specific depths, then estimate the 

depth to be sampled and mark the sampling line at the desired depth. In some cases, a storage tank 

gauge stick may be lowered to the bottom of the tank, removed, and then used to measure the actual 

depth of the fuel as indicated on the stick. Using the sample line, slowly lower the sampler until the 

desired level is reached. 

c.	 When the sampler is at the required depth, pull out the bottle stopper with a sharp jerk of the sampler 

line and allow the bottle to fill completely (usually evidenced by the cessation of air bubbles). 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing	 NIST Handbook 158 (2016) 

d.	 Retrieve the sampler by the sample line. Position it over the fuel/oil spill pad and wipe off the exterior 

of the sampler body with a disposable rag. 

e.	 Position the sampler over the sample container and release its contents by pulling up on the plunger 

line. Fill the sample container to 80 % of capacity. 

f.	 Cap the sample container tightly, and (if used in your jurisdiction, attach a security seal) place it in 

transport carrier. 

g.	 Properly dispose of any excess fuel in the sampling device; then clean, dry, and store it. 

h.	 Reseal the tank access port and properly dispose of any contaminated soaker pads or rags. 

2.	 Submerged Samplers (Bacon-Bomb-Thief) (Figures 3 and 5): These samplers are typically used to take 

bottom samples but can be modified to take samples at different levels. They consist of a nickel-plated 

brass cylinder tapered at both ends and fitted with an internal, plunger-type valve. The valve opens 

automatically when the sampler strikes the bottom of a storage tank and allows the fuel to enter the 

container and closes when lifted. A drop cord is attached to a ring at the top of the sampler. 

Typical Procedures for Use of a Submerged Sampler: 

NOTE: To ground a static buildup, the person taking the sample should touch the tank at a point at least 

1 m (39 in) away from the sampling opening before starting the sampling process. 

Recommended steps: place an appropriate disposable fuel/oil spill pad (sometimes called a “soaker pad”) 

next to the tank sampling point. 

NOTE: Fill the sampler with fuel and then rinse and drain it before taking a sample. 

a.	 Attach the sample line and the plunger line to the sampler. 

b.	 Estimate the depth to be sampled and then mark the sampling line with the desired depth. In most 

cases, a storage tank gauge stick may be lowered to the bottom of the tank, removed, and then used to 

measure the actual depth of the fuel as indicated on the stick. 

c.	 Open the tank access port. Using the sample line, slowly lower the sampler until the desired level is 

reached. 

d.	 Pull up on the plunger line and allow the sampler to fill before releasing the plunger line to close the 

seal. 

e.	 Retrieve the sampler by the sample line being careful not to pull up on the plunger line and thereby 

prevent accidental opening of the bottom valve. 

f.	 Position it over the fuel/oil spill pad and wipe off the exterior of the sampler body with a disposable 

rag. 

g.	 Position the sampler over the sample container and release its contents by pulling up on the plunger 

line. Fill the sample container to 80 % of capacity. 

h.	 Cap the sample container tightly and, (if used in your jurisdiction, attach a security seal) place in 

transport carrier. 

i.	 Properly dispose of any excess fuel in the sampling device and then clean, dry, and store it. 

j.	 Reseal the tank access port and properly dispose of any contaminated soaker pads or rags. 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

3.	 Tank or Drum Thief Sampler (Plastic Cylinder): Typically these are plastic cylinder (tube type) 

samplers which consist of a multi-piece, plastic tube, 1 m (39 in) to 5 m (195 in) long and 38.1 mm (11⁄2 in) 

at maximum diameter. The tubes are typically fitted with two finger rings at the upper end and three 

supporting legs at the bottom. Both ends are tapered with openings. The top opening of the sampler is 

closed with a stopper (or gloved thumb) or valve until the sampler is submerged in the liquid. Then the 

stopper is removed from the opening or the valve is opened, allowing the fuel to fill the sampler. It is used 

in tanks drums, barrels, or cans. 

Typical Procedures for Use: 

NOTE: To ground a static buildup, the person taking the sample should touch the tank at a point at least 

1 m (39 in) away from the sampling opening before starting the sampling process. 

NOTE: Fill the sampler with fuel and then rinse and drain it before taking a sample. 

a.	 Remove cover from sample container and place it on a solid level surface at a conveniently located 

height so that it is easily accessible when holding a filled thief tube (typically a clean, dry jar with a 

large opening is use to collect this fuel sample so that the tube thief can be easily inserted.) 

b.	 Open the tank access port. Slowly insert thief tube into storage tank. Hold it firmly with a wiping 

cloth while sampling and use the cloth to dry the tube as you remove it from the tank. Keep the cloth 

in contact with the tube throughout the process to reduce the buildup of static electricity. 

c.	 Open the tube or valve and allow the fuel in the storage tank to reach an equal level in the tube. Once 

the tube is filled close the tube or valve firmly. 

d.	 Remove the thief tube from the storage tank slowly to confirm that there is no fuel leaking and then 

insert the tube into the receiving jar. Wipe the tube dry. 

e.	 Release the fuel into the sampling container until it is filled to 80 % of capacity. 

f.	 Close the tube or valve firmly and remove the sampler from the sample container. Close the sample 

container. Dispose of any excess fuel in the tube and then clean, dry, and secure the sampler. 

g.	 Reseal the tank access port and properly dispose of any contaminated soaker pads or rags. 

C. Fuel Sample Containers 

Types of sample containers may include clear or amber colored borosilicate glass bottles (laboratory grade) or 

metal cans. (Note: Shatter resistant glass bottles are available from a variety of vendors.) Only cans with 

seams soldered on the exterior surface may be used for fuel samples. (If they are not properly soldered, minute 

traces of flux may contaminate the sample and interfere with tests for dielectric strength, resistance to oxidation, 

and sludge formation.) There are several reasons that clear bottles may be preferred. Glass prevents permeation 

and allows a visual inspection of the sample for cleanliness and to see if there is free water or solid impurities 

present. However, samples of gasoline, jet fuel, and kerosene must be protected from direct sunlight so amber 

bottles or cans are recommended for those fuels. Clear glass bottles covered with paper or foil may also be 

used, and immediately placing a clear bottle in a transport box (described elsewhere in this handbook) also 

provides protection. Screw caps made of either plastic or metal may be used; the caps should provide a vapor 

tight closure seal. The screw caps must be protected with liners made of metal foil, Teflon, polyethylene, or 

other material that will not be destroyed by or affect the sample product. Plain cork stoppers and lids with 

cardboard inner-liners are not acceptable. If samples are shipped, see the U.S. Department of Transportation 

requirements in §49 Code of Federal Regulations. Containers may be reused indefinitely but must be cleaned 

and resealed to reduce the possibility of contamination. See Table 1. Suggested Container Types and Minimum 

Sample Sizes and Figures 7 through 12 for examples of the containers typically in use and minimum sample 

sizes. For a more detailed statement on specifications for sampling containers see ASTM D5854 “Standard 

Practice for the Mixing and Handling of Liquid Samples of Petroleum and Petroleum Products.” 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing NIST Handbook 158 (2016) 

Table 1. 

Suggested Container Types and Minimum Sample Sizes for Fuel 

Product 

Container Material 

Minimum 

Sample Size 

Glass

Aluminu

m

Metal

FHDPB 

“Plastic” 

1. Gasoline – General4 X X X NO 2 L 

Alcohol/Ether X X X NO 2 L 

Vapor Pressure X X X NO 1 L 

Trace Lead X X X NO 1 L 

2. Diesel Fuel – General X X X NO 2 L 

3. Kerosene – General X X X NO 2 L 

4 Fuel Oil – General X X X NO 2 L 

5. Aviation Gas – General2,3 X X X NO 2 L 

6. Aviation Turbine Fuel – General2, 3 X X X NO 2 L 

7. Biodiesel – General X X X NO 1 L 

8. E85 – General X X X NO 1 L 

9. Hydrogen – General X X X NO 1 L 

10. Methanol – General NO NO X1 NO 1 L 

NOTE 1: Methanol (also known as methyl or wood alcohol) is used as a fuel primarily in race cars. It is also 

available in gasoline-methanol blends that range from 10 % to 30%. If samples are taken of these fuels do not use 

aluminum containers because there is a potential for corrosion to occur. It is recommended that containers 

constructed of 316L series stainless steel be used to hold samples of this fuel or blends containing methanol. See 

the “Methanol Safe Handling Manual” at Methanol Institute (www.methanol.org) for specific guidance on handling 

this product. 

NOTE 2: See ASTM D4306 “Standard Practice for Aviation Fuel Sample Containers for Tests Affected by Trace 

Contamination” for more guidance on containers and their preparation prior to placing fuel in them. Generally, 

borosilicate glass bottles are adequate if wrapped in aluminum foil or stored in a sealed sample box to protect the 

fuel from light. 

NOTE 3: When collecting samples of aviation gasoline and aviation turbine fuel for thermal stability, water 

separation, trace metal and other tests refer to ASTM 4306 for special container requirements and guidance on 

cleaning, preparation and handling procedures. The sample must be tested within 24 hours of taking. 

NOTE 4: According to Section 6. Interferences in ASTM D2699 “Standard Test Method for Research Octane 

Number of Spark-Ignition Engine Fuel” and ASTM D2700 “Standard Test Method for Motor Octane Number of 

Spark-Ignition Engine Fuel” exposing fuels to UV wavelengths shorter than 550 nm for a short period of time may 

significantly affect octane number ratings. For this reason, fuel samples must be protected from damaging light. 

Collect and store fuels to be tested for research or motor octane in an opaque container, such as a dark brown glass 

bottle or metal can to minimize exposure to UV emissions from sources such as sunlight or fluorescent lamps. 

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NIST Handbook 158 (2016) Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

Figure 7. Clear Bottles. Figure 8. Can with Provision for Security Seal. 

Figure 9. Amber Brown Bottle with Label. Figure 10. Bottles with Etched Identity Numbers.
 

Photo courtesy of the State of Colorado, Div. of Oil and Public Safety. Photo courtesy of the Missouri Department of Agriculture.
 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing NIST Handbook 158 (2016) 

Figure 11. One Quart – Metal Container with Label. Figure 12. One Liter - Stainless Round Container with Wire 

Security Seal Loops. 

D. Washing and Drying Sample Containers (one example) 

After each use, the sample container should be cleaned using the following procedure or one that provides 

equivalent or better results: 

1. Rinse with a solvent. Discard solvent in accordance with good environmental practice. 

2. Wash with a strong soap solution. 

3. Rinse with distilled water. 

4. Dry in a dust-free cabinet at a temperature of at least 40 °C (104 °F) or warmer. 

5. Close container immediately after it is dry. 

6. Store in a location specifically designated for clean-ready to use, sample containers. 

NOTE: Samples Containers for Microbiological Testing: A sterilized glass or polypropylene 

bottle must be used to hold the sample. If a sampler is used to take the fuel sample, it too must be 

cleaned and sterilized before use. Sterilization can be accomplished by placing the bottle (and cap 

if heat resistant) in an oven at 160 °C (320 °F) for one hour. Alternatively, an autoclave may be 

used as long as the bottle and cap are dried prior to use. Microbiological sampling requires 

procedures not covered in this handbook. Refer to ASTM D7464 - 14 “Standard Practice for 

Manual Sampling of Liquid Fuels, Associated Materials and Fuel System Components for 

Microbiological Testing” for guidance on sampling methods and handling procedures. 

NOTE: Sample Containers for Trace Analysis: Use procedures that ensure sampling equipment 

and containers are made with materials known not to interfere with the analysis. It is also important 

to ensure that every component of the sampling process is clean and dry so that the fuel sample is 

not contaminated or tainted. 

NOTE: To avoid potential rust contamination, metal containers may be cleaned using Varsol or 

acetone. 

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NIST Handbook 158 (2016) Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

E. Capacities 

The capacity of the most common sample bottles and containers are typically 937 mL (1 QT) and they have 

sealing caps compatible with fuel. Bottles and sealing caps must be clean and dry prior to use. 

F. Identifying Samples for Traceability 

The information shown in Table 2 illustrates the type of information typically collected on a fuel sample. In 

many jurisdictions, the sample container is permanently marked with a unique identifying number and no label 

is applied. In other jurisdictions, a label is applied to the container which bears a unique identifier number. In 

most jurisdictions, a Fuel Sample Data Sheet (FSDA) is included with the sample in the shipping case. Some 

information may be stored in a database while other data is entered on a data sheet. 

Table 2. 

Examples of Entries on a Fuel Sample Data Sheet 

Item Entry 

1. Sample number/unique container 

identity 

Enter the sample container’s unique identifier number. Each sample must 

have a unique identifier such as a number or alpha numeric code so its 

handling can be traceable, and so that all collection reports and laboratory 

tests are linked to the original sample. 

2. Product identification Obtained from device product label, tank marking, or bill of lading. 

3. Ethanol content Indicate if device label or signage reads (e.g., “up to 10 %” or “contains 

10 %” or other claim). 

4. Sampling location identity Enter business name, identifier number (this may be assigned by the fuel 

regulatory agency), address of sample location, business mail address, 

agent name, telephone, fax, and e-mail. This information may be used to 

immediately notify the seller to remove the product from sale should the 

sample fail. 

5. Special test to be conducted on 

sample 

This item is entered if there is a reason to call for a specific test to be 

conducted on a sample. This may be used in cases where the testing 

laboratory does not routinely conduct the requested test on all samples 

(e.g., in case of a consumer complaint). 

6. Sampled lot Amount of fuel that the sample represents. Total liters or gallons in the 

source fuel storage tank represented by the sample. 

7. Supplier(s) of fuel Enter the name of the supplier or suppliers of the fuel in the source fuel 

storage tank. 

8. Date of last fuel delivery to 

storage tank. 

Enter the day of the latest delivery of the fuel into the storage tank from 

which the sample was taken. 

9. Sample Taken by Name (or identifier number) of the official who took the fuel sample. 

10. Source of sample Identify the specific source of the sample (e.g., dispenser or storage tank 

identity, number or location, or license or vehicle number of tank truck and 

compartment number). 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing NIST Handbook 158 (2016) 

Table 2. 

Examples of Entries on a Fuel Sample Data Sheet 

Item Entry 

11. Date/Time sample collected Enter the time of day, day, month and year indicating when the sample was 

collected. 

12. Sampling Equipment Used Enter weighted bottle or other sampling tool, if applicable. 

13. Type of Sample (when taken 

with a Sampler) 

Enter outlet sample, or upper, middle, lower, bottom or all level sample 

depending on the collection method used. 

14. Notes/Safety Warning Label Enter weather conditions and any remarks necessary to accomplish the 

analysis of the sample. Provide Required Safety Warnings. 

15. Security Seal(s) Enter the identification number of any security seal applied to a sample 

container or transport case. 

G. Sample Transport Cases 

Most jurisdictions place fuel samples in sealable insulated containers immediately after they are taken. These 

cases (see examples in Figure 13) hold the fuel sample safely for transport while protecting them from sunlight 

and heat. A sample case must bear a label indicating that it contains gasoline or oil samples to alert anyone 

who handles it that it contains flammable liquids. (See also Section I., F. Vehicle and Sample Case Markings 

for Hazardous Materials Transportation – Alerting Emergency Responders, Item 3. Sample Cases.) 

Figure 13a. Sample Box. Figure 13b. Sample Box Showing Insulation. 

Photo courtesy of the North Carolina Department of Agriculture Photo courtesy of the Missouri Department of Agriculture. 

and Consumer Services. 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

Figure 13c. Sample Box showing Security Seal in Place Figure 13d. Sample Box containing Collection Reports as 

received at the Fuel Laboratory. 

Photo courtesy of the Missouri Department of Agriculture. Photo courtesy of the Georgia Department of Agriculture. 

1.	 Procedure for Use of Transport Boxes: 

Once samples have been collected: 

a.	 Recheck that the sample container is not overfilled and confirm tightness of the cap/seal on the 

container and check for leakage. 

b.	 Ensure a unique sample identification number is on the can. Place sample container in the transport 

box. 

c.	 Ensure that the custody record for each transport box is complete, placed in a plastic protective cover, 

and placed in the container or affixed to the inside lid. 

d.	 Secure and custody seal the lid of the transport box and record the security seal number on the primary 

inspection report. 

I. Security Seals for Containers and Boxes 

A container holding a fuel sample should be sealed as part of the chain of custody system but this sealing is not 

mandatory if other safeguards are in place. For example, if the fuel is held under the secure control and 

possession of the fuel official who collected the sample from time it was collected until it is delivered to the 

fuel laboratory, sealing is unnecessary. Another exception to sealing is permitted if the container is placed in 

a sealed sample transport box for storage and transportation to the fuel laboratory. 

J. Recommended Sampling Equipment - Nozzle Extender 

It is recommended that all fuel samples taken from a dispenser nozzle be collected using a nozzle extender. 

These tubes are typically constructed of Schedule 80 non-ferrous metal. They can be constructed of a single 

tube (See Figure 14.) or made for bi-furcated filling (See Figure 15.). See ASTM D5842 for detailed instruction 

on fabricating these extenders. 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing	 NIST Handbook 158 (2016) 

14. Single Nozzle Extender.	 15. Dual Nozzle Extender. 

Photo courtesy of the Missouri Department of Agriculture. 

VI. SAMPLING PROCEDURE FOR TAKING FUEL SAMPLES AT RETAIL 

FUELING LOCATIONS 

A. Preparation 

1.	 Conduct: Officials must conduct themselves in a professional manner at all times when taking samples. 

This includes being aware of what is going on around them so that a safe working environment prevails. 

Officials should park vehicles in a suitable location until management of the sampling location have been 

notified of the identity, authority, and nature of the visit. When sampling at retail locations, it is often 

necessary to have the fuel dispensers authorized for operation so that samples can be taken. Officials must 

establish contact with the authorized management representative and explain how samples will be taken to 

ensure that the console operator(s) understands what is expected in assisting the official. It is 

management’s right to observe sampling procedures and be present during the sample collection process 

if they choose to do so. This will allow the person to confirm the source of the fuel and identity of the 

container and enable them to satisfy themselves that the sample container was properly sealed and purged 

fuel was returned to the proper storage. 

2.	 Business Identity: Obtain the business ownership and other identity information. 

3.	 Storage Tank: To ensure that purged fuel is returned to the correct storage tank, verify that the markings 

on the storage tank are understood, and that they match the fuel identity chart. If there is any doubt about 

the proper storage tank, the official should ask the location manager to indicate the appropriate tank access 

point. 

NOTE: For reference see NIST Handbook 44, “Specifications, Tolerances, and Other Technical 

Requirements for Weighing and Measuring Devices,” Section 3.30. Liquid-Measuring Devices Code, 

U.R.2.5. Product Storage Identification. (See also NIST Handbook 130, Uniform Engine Fuels and 

Automotive Lubricants Regulation, Section 4.4. Product Storage Identification.): 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

Source: NIST Handbook 44 – Section 3.30. 

UR.2.5. Product Storage Identification. 

(a) The fill connection for any petroleum product storage tank or vessel supplying motorfuel devices shall be permanently, plainly, and visibly marked as to product contained. 

(b) When the fill connection device is marked by means of a color code, the color code key 

shall be conspicuously displayed at the place of business. 

4.	 Avoid Disrupting Normal Business Operations: The official should select a dispenser lane for sampling 

and either block the lane around the dispenser with safety cones or park their vehicle in the lane. The 

vehicle should be positioned to allow ample access to the dispenser. The official should turn off lights, 

radios and the vehicle engine and set its parking brake. A walk-around inspection should be conducted to 

ensure there is easy access to sampling equipment and a fire extinguisher. At the end of the sampling and 

before the vehicle is moved another walk-around inspection should be made to ensure that all equipment 

has been collected and all samples and the dispenser are secured (e.g., that the dispenser housing is reclosed 

if it was opened for inspection.) 

5.	 Payment for Samples: In most jurisdictions, the official is obligated to pay the retail value of the product 

if a fuel sample is taken from a place of business where it can be sold legally unless the sample is being 

collected pursuant to a search warrant, or the fuel’s owner surrenders the sample at no cost. 

A sample of a payment receipt is shown below: 

PAYMENT RECEIPT 

Agency Responsible for Engine Fuel Quality 

Address, 

City, State, Zip 

Telephone, E-mail, URL 

Seller’s Name: Address: Date: 

Received $___________________as payment for the fuel or oil samples described below taken for inspection 

purposes as provided for by Chapter xxxxx of the Code of the State of ___________________. 

__________________________________________________ 

Signature of Business Representative 

Sample Taken: Official: 

6.	 Documentation: Throughout an official visit, it is important that information about device labeling and 

signage related to the fuel be recorded to document the product identity and other claims made by the 

seller. The official should make a brief record of actions taken and his or her observations as well as details 

of any relevant information provided by the seller or the seller’s representative. Taking notes, photographs, 

and keeping logs provide permanent records of a fuel sampling activity and facilitate enforcement. 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing	 NIST Handbook 158 (2016) 

B. Sample and Containers 

1.	 Sample Size: A fuel sample of at least 1 L (1 qt) should be taken. If a vapor pressure test is to be performed, an 

additional fuel sample of the same volume should be taken. As a general rule, a sufficient amount of product 

should be collected to allow for the initial test, a repeat test, and retention of some product for evidence in case of 

legal action. For reasons of due process, irreplaceable evidence, whether favorable or unfavorable to a 

regulated business, should not be discarded prior to the conclusion of legal proceedings, including the 

time allowed for the filing of appeals. 

2.	 Sample Container Fill Levels: To allow for thermal expansion, sample containers should not be filled to more 

than 80 % of their capacity. Samples taken for vapor pressure testing MUST be filled between the 70 % 

to 80 % level. The official should always close sample containers tightly immediately after filling and 

check for leaks by tilting the container up and holding it in the inverted position for 10 seconds. The most 

widely used method for the collection of fuel samples is to fill a clean sample bottle with fuel from a 

dispenser nozzle/outlet. This eliminates the use of other sampling equipment and reduces the risk of 

contamination. The sample container should be of the type best suited to the product and to the purpose 

of the test. It must be visually inspected immediately prior to use to ensure it is clean, dry, and lint-free. 

Only use clean and dry sampling equipment and containers to prevent contamination of the fuel sample. 

Table 3. 

Sample Size – Container Fill Levels Based on Dispenser Readings 

Sample Container 

Capacity 

1 Fl Qt* 

70 % Capacity 80 % Capacity 

Dispenser Readings from Zero (0) 

0.25 gal 0.175 gal 0.200 gal 

0.946 L* 0.662 L 0.756 L 

Sample Container Capacity 

1 L 0.700 L 0.800 L 

*These values are provided for situations where a one fluid quart container is used to take a sample from a retail 

dispenser which delivers in liters. 

3.	 Recommended Sampling Practice: It is recommended that the sample container be placed on the island 

next to the dispenser (or on a grounded cart such as the one pictured below) to avoid the possibility that 

the container will be dropped or that a spill might result in the official’s clothes being soaked with fuel. 

Submerged filling of an open container is critical to ensuring safety and to reduce the loss of light ends 3 

The official should use a cotton rag to wipe and clean the parts of the nozzle and extension piece that come 

into contact with the sample container and fuel sample. Use of an extension tube constructed of conductive 

metal (e.g., copper) that reaches to the bottom of the sample container to ensure submerged filling of the 

container (see Figure 16) is recommended for taking all samples. The official should place the metal nozzle 

spout in contact with the extension piece or container to prevent build up and discharge of static electricity 

and then manually control the nozzle and fill the container slowly to decrease the build-up of static 

electricity. It is recommended that the sample container be kept at least 1 m (3 ft) away from any vehicle 

during filling to prevent ignition of fumes by hot engines or catalytic converters during filling. 

3The term “light ends” means hydrocarbons from crude distillation that are low density (lighter weight than gasoline) and have low 

boiling temperatures. Butanes are the most common light end hydrocarbons used in gasoline. 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

Figure 16. Sample Bottles Empty and Filled with Bifurcated Tube.
 

Photos Courtesy of Missouri Department of Agriculture
 

17. Fuel Sampling Cart with Transport Case and Safety	 18. Fuel Sampling Cart with Sample Container bonded to cart 

Gasoline Can to hold fuel from nozzle-hose flushes.* and ground.* 

*This cart is used by the State of North Carolina. Photos courtesy of the North Carolina Department of Agriculture and 

Consumer Services 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing	 NIST Handbook 158 (2016) 

C. Sampling 

1.	 Sample Taken from a Measuring Device that Dispenses a Single Product: No flushing is required for 

this nozzle-hose combination. The official should: 

a.	 Place the sample container on the concrete drive-way, a grounded cart, or on the island next to the 

dispenser so it is grounded or bonded. 

b.	 Use a cotton rag to wipe the parts of the nozzle and extension tube that come into contact with the 

sample container and fuel sample. 

c.	 Authorize the dispenser and place the nozzle/outlet and extension tube in the sample container and fill 

it slowly to reduce foaming and light end loss and so that air leaves the container without splashing 

fuel droplets. Continue until it is filled to the specified volume (or the dispenser indicates the quantity 

specified for the sample). See Table above for dispenser readings when the delivery begins at 0.000. 

d.	 Close the sample container and mark as required. 

2.	 Sample Taken from a Multi-Product or Blended Product Dispenser (See Section 3. for recommended 

procedures for use in taking an E15 sample.): 

Background: In 2000, the National Conference on Weights and Measures (NCWM) Laws and Regulations 

(L&R) Committee issued a guideline recommending that the minimum flush quantity to be at least 1.1 L 

(0.3 gal).4 Since that time, data from a number of states indicates that this amount (1.1 L) is not sufficient. 

NIST recommends that a minimum flush quantity of 1.8 L (0.5 gal) be used for most installations unless 

the installation indicates that a larger purge is justified. The fuel used for flushing the nozzle of the 

dispensers should be collected in an approved container and then be returned to the storage tank 

containing the lowest octane fuel but do not return flex-fuel blends of ethanol above 10 % to the source 

storage tank.5 Provision must be made by the seller for disposing of blended products which cannot be 

returned to storage tanks. The amount of fuel flushed from each dispenser must be recorded on the primary 

inspection report and a copy presented to the seller. 

The official should: 

a.	 Select the lowest grade. Authorize the dispenser and run 1.8 L (0.5 gal) slowly into an approved 

container (e.g., a 19 L [5 gal] safety can or test measure). 

NOTE: When a sample is taken from a measuring device that is capable of blending different grades of 

fuel for delivery through a single nozzle, the official must flush the hose and nozzle prior to taking a sample. 

NIST recommends that a minimum flush quantity of 1.8 L (0.5 gal) be taken from a typical dispenser 

installation equipped with a standard length hose. 

4Based on data from several programs, when a 1.1 L flush is used, many samples failed because the amount of fuel retained in dispensers varies 

depending on the installation. In some instances, the use of a 1 gal flush may be required to eliminate the possibility that hose and nozzle 

contamination can cause a sample to fail or that a failure can be called into question. By increasing the flush quantity to a minimum of 1.8 L 

(0.5 gal) programs were successful in addressing issues where installations requiring additional piping would fail due to inadequate purge of 

1.1 L (0.3 gal) value. Based on this information, NIST recommends a minimum flush quantity of 1.8 L (0.5 gal) be used for most installations 

unless the installation indicates that a larger purge is justified. 

5From Draft “Blending and Dispensing Flex Fuels” by the Colorado Department of Labor and Employment – Division of Oil and 

Public Safety at: https://www.colorado.gov/pacific/sites/default/files/Guidance%20-%20Blending%20And%20Dispe 

nsing%20Flex%20Fuels.pdf. Accessed 8/12/2015. See also “Missouri Guidelines for Blending Flex Fuels Pilot Program” at 

http://www.blenderpumps.org/factors-to-consider/state-guidelines-a-programs/103-guidelines-for-blending-flex-fuel 

s-pilot-program.html. Accessed 8/12/15. 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

b. Use a cotton rag to wipe the parts of the nozzle and extension tube that come into contact with the 

container and fuel sample. (See Table 3. Sample Size – Container Fill Levels Based on Dispenser 

Readings when the delivery begins at zero [0]). 

c. Place the nozzle/outlet and extension tube in the sample container and fill it slowly to reduce 

foaming and light end loss and so that air leaves the container without splashing fuel droplets. 

Continue until it is filled to the specified volume (or the dispenser indicates the quantity specified 

for the sample). 

d. Seal the sample container and mark as required. The exterior of the sample container must be 

wiped to ensure it is clean and dry prior to placement in a sample transport case. 

e. Reset and reauthorize the dispenser, select the next grade, flush the nozzle and hose and fill the 

sample container as described above. Continue this process until samples of all grades have been 

taken. 

f. Return purged fuel to proper storage and record quantities on inspection report. Do not return 

flex-fuel blends of ethanol above 10 % to the source storage tank. Provision must be made by the 

seller for disposing of blended products which cannot be returned to storage tanks. 

NOTE: Where mid-grade flex fuels are blended using Multiple Product Dispensers (MPD), adjustments 

MUST be made to the blend ratio of each dispenser at different times throughout the year to ensure that 

the blend contains the required amount of ethanol. The time at which these changes are made is dependent 

on the geographic location of the dispenser. The blend ratio required to achieve the correct blend depends 

on the amount of ethanol contained in the unleaded gasoline and E85. The amount of ethanol contained 

in these components will vary with the provider. Each grade of mid-grade flex fuel dispensed through 

blending dispensers must be independently tested for ethanol content at the time the dispenser (or group 

of dispensers) is installed at a facility, and prior to use. 

3.	 Recommended Sampling Procedures for Taking an E15 Sample from a Multiple Product Dispenser 

(MPD). 

Background: Multiple Product Dispensers (MPDs) or blender pumps are designed to deliver a single 

grade of product or to combine two grades at the dispenser in predetermined ratios by drawing fuel from 

different storage tanks and using sensors and flow rate controllers that ensure the targeted blend is 

dispensed. These pumps have been used for many years to create mid-octane fuels by blending the low 

and high octane fuels at the dispenser. The typical MPD uses a feedback system to adjust the blend 

delivered at the nozzle. To do that, two grades of fuel from two different inlets are fed through individual 

meters with their quantities controlled by a variable flow valve located after each meter. The dispenser 

senses the amount of product going through each meter and adjusts the opening of each valve to conform 

to the ratio for the selected product. At the beginning of the transaction and during re-starts (i.e., the blend 

ratio mechanism is reset every time the user closes and reopens the nozzle and when the nozzle’s automatic 

shutoff kicks in and the nozzle is then restarted), the dispenser makes adjustments to attain the correct 

blend ratio as it relates to the entire transaction and to deliveries made at normal speed. It is important 

to recognize that the fuel blend is also affected by both the flow rate of the dispenser and system pressure, 

which vary depending on the number of dispensers on the system drawing from the different fuel storage 

tanks. The blend ratios will be different when using a MPD to produce E15 and mid-level ethanol blends 

(Exx). Because the normal fuel sampling process involves taking a small quantity of fuel at a slow flow 

rate (and that may involve re-starts), it is likely that the fuel blend in these samples are not representative 

of the fuel delivered in a typical customer transaction. The Environmental Protection Agency (EPA) has 

recognized that this operational characteristic of MPDs for blending E15 may result in the inadvertent 

mis-fueling of E15 in vehicles, engines, and equipment not covered under the EPA’s E15 waiver to the 

Clean Air Act. To help ensure that customers do not inadvertently mis-fuel vehicles, engines, and 

equipment not covered underE15 waiver, the EPA requires retailers to dispense E15 at a MPD only 

through EPA-approved MPD configurations. (See pages 43 and 45 in the “E-15 Retailer Handbook” by 

the Renewable Fuels Association at http://ethanolrfa.3cdn.net/643f311e9180a7b1a8_wwm6iuulj.pdf.) 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing	 NIST Handbook 158 (2016) 

For these reasons, it is recommended that a fuel quality sample (e.g., 1 L) be taken from a larger sample 

of between 7.5 L (2-Gal) and 9.4 L (2.5- Gal) or more. The sample should be collected in a clean container 

(e.g., a 9.4 L (2.5- Gal) or 19 L (5-Gal) safety can under a continuous flow delivered at or near the fullflow rate of the device because this allows the dispenser adequate time to account for system variations in 

making its adjustments to the blend ratio. If the flow is interrupted prior to collecting at least 7.5 L (2– 

gal) the product must not be used in a fuel sample. By following the recommended procedures to collect 

samples for fuel quality determinations, an official should obtain an accurate representation of the fuel 

that the dispenser has delivered. 

Important: For samples to be tested for conformance to volatility standards during the VOC season (June 

1- Sept 15) additional steps and procedures will need to be followed. See NOTICES section for appropriate 

ASTM International Standards. 

E15 Sampling Procedure 

There are several methods that can be used to obtain a sample of the product that is representative of the 

fuel going into the customer’s tank in a typical delivery. Here are three suggestions based on whether the 

official is simply taking a fuel sample or taking a fuel sample in conjunction with testing the dispenser for 

accuracy according to NIST Handbook 44. 

There are three acceptable Methods for procuring samples for quality testing. 

Method #1 (Taking a Fuel Sample) 

1.	 Flush the dispenser with a minimum of 1.8 L (0.5-Gal) using E15 (or with the blend being tested) into 

a separate container using a continuous flow at or near the full-flow rate of the device and dispose of 

the flushed fuel. 

2.	 Place the nozzle into the can against the opening at a level to avoid overfilling but positioned to reduce 

the possibility of prematurely activating the automatic shut-off mechanism. If practical, maintain a 

continuous flow by avoiding manual restarts of the nozzle. Start a new transaction with the E15 setting 

(or whatever blend is under test), dispense at least 7.5 L (2-Gal) into a clean 9.4 L (2.5-Gal) or larger 

safety can using a continuous flow at or near the full-flow rate of the dispenser. If the flow is stopped 

for any reason prior to the collection of 7.5 L (2-Gal) dispose of the fuel and repeat this step. 

3.	 Take the sample from the fuel in the container. 

Method #2 – (Taking a Fuel Sample) 

1.	 Flush the dispenser with a minimum of 7.5 L (2-Gal) with continuous flow at or near the full-flow 

rate of the device using E15 (or whatever blend is being tested). If there is a flow interruption prior 

to delivering 2-Gallons do not restart the flow, dispose of the fuel. Repeat this step until more than 

7.5 L (2-Gal) is delivered without interruption. Proceed to next step. 

2.	 Pull a sample from what is left in the hose (residual) into an appropriate clean sampling 

container. The sample should not exceed 0.49 L (0.13-Gal). 

3.	 Dispose of the flushed fuel. 

Method #3 (Taking a Fuel Sample in conjunction with a device accuracy test) 

1.	 Flush the dispenser with a minimum of 1.8 L (0.5-Gal) using E15 (or whatever blend is being tested) 

into a separate container using a continuous flow at or near the full-flow rate of the device. Dispose 

of the flushed fuel. 

2.	 Place the nozzle in the test measure and against the opening at a level to avoid overfilling the test 

measure and but positioned to reduce the possibility of prematurely activating the automatic shut-off 

mechanism. Conduct a device accuracy test in the E15 setting (or whatever blend is being tested), and 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

dispense 19 L (5-Gal) into a test measure to check the accuracy of the dispenser. Operate the nozzle 

at or near the full-flow rate of the device and, if practical, maintain a continuous flow by avoiding 

manual restarts of the nozzle. 

3.	 After the accuracy test is completed, take the fuel sample directly from the test measure by filling the 

sample container using a clean dry funnel. 

NOTICE: It is recommended that the following ASTM International Standards be utilized to procure fuel quality 

samples and to determine the ethanol content of E15 (or whatever blend is being tested) samples. 

•	 ASTM D5599 - 15 “Standard Test Method for Determination of Oxygenates in Gasoline by Gas 

Chromatography and Oxygen Selective Flame Ionization Detection” 

•	 ASTM D5501-12Ɛ 1 “Standard Test Method for Determination of Ethanol and Methanol Content in Fuels 

Containing Greater than 20% Ethanol by Gas Chromatography” 

•	 ASTM – D4057 - 12 “Standard Practice for Manual Sampling of Petroleum and Petroleum Products” 

•	 ASTM - D5842 - 14 “Standard Practice for Sampling and Handling of Fuels for Volatility Measurement” 

Ɛ 1 Note – Editorial corrections were made to 7.4.3. and 7.5. in July 2013 

4.	 NIST Handbook 44, Section 3.30. Liquid Measuring Devices, User Requirements (UR). 

NOTE: Alternative Flush Quantities: The recommended minimum flush amount is based on the internal volume 

of a 3 m (10 ft) hose. In NIST Handbook 44, “Specifications Tolerances and other Technical Requirements for 

Commercial Weighing and Measuring Devices,” Section 3.30. Liquid Measuring Device Code, U.R.1.1. User 

Requirement (shown below) permits discharge hose lengths up to 5.5 m (18 ft) on most retail fuel dispensers, but 

dispensers at marinas are permitted to extend to 15 m (50 ft). 

UR.1.1. Discharge Hose. 

UR.1.1.1. Length. – The length of the discharge hose on a retail motor-fuel device: 

(a)	 shall be measured from its housing or outlet of the discharge line to the inlet of the 

discharge nozzle; 

(b)	 shall be measured with the hose fully extended if it is coiled or otherwise retained 

or connected inside a housing; and 

(c)	 shall not exceed 5.5 m (18 ft) unless it can be demonstrated that a longer hose is 

essential to permit deliveries to be made to receiving vehicles or vessels. 

An unnecessarily remote location of a device shall not be accepted as justification for an 

abnormally long hose. 

UR.1.1.2. Marinas and Airports. 

UR.1.1.2.1. Length. – The length of the discharge hose shall be as short as 

practicable, and shall not exceed 15 m (50 ft) unless it can be demonstrated that a 

longer hose is essential. 

The following Table 5. provides the approximate volume contained in various internal diameters of fuel 

hoses with the length of 3 m (10 ft). The recommended purge is adequate for the most commonly used 

hose with an internal diameter up to 22.2 mm (7

/8 in) hose diameter. If an official encounters hoses with 

larger internal diameters or lengths of greater than 3 m (10 ft) the flush amount can be adjusted to fully 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing	 NIST Handbook 158 (2016) 

purge the hose and reduce the chance for contamination. If 3 m (10 ft) lengths of the larger interior 

diameters hoses are found, increase the flush to the quantities stated in Column 2. If longer lengths of any 

of the discharge hoses are found, the official should measure its length and multiply that value by the 

volume contained in 304 mm (1 ft) by the volume in Column 3. For example, if a blending dispenser with 

a 18 ft discharge hose with an interior diameter of 7

/8 in is found, multiply 18 × 0.030 gal = flush volume 

of 0.540 gal. 

Table 5. 

Approximate Volume Contained in Various Internal Diameters of Fuel Hoses 

(based on the hose length of 3 m [10 ft]) 

Column 1. 

Discharge Hose Interior 

Diameter 

Column 2. 

Approximate 

Volume in 3 m (10 ft) 

Column 3. 

Approximate 

Volume in 304 mm (1 ft) 

12.7 mm (1/2 in) 0.370 L (0.10 gal) 0.037 L (0.010 gal) 

15.9 mm (5/8 in) 0.600 L (0.16 gal) 0.056 L (0.015 gal) 

19.1 mm (3/4 in) 0.870 L (0.23 gal) 0.075 L (0.020 gal) 

22.2 mm (7/8 in) 1.170 L (0.31 gal) 0.113 L (0.030 gal) 

25.4 mm (1 in) 1.552 L (0.41 gal) 0.151 L (0.040 gal) 

31.8 mm (11/4 in) 2.422 L (0.64 gal) 0.227 L (0.060 gal) 

NOTE: Except for the ethanol blends noted above, return the accumulated flush fuel for all of the sampled 

blends to the lowest grade storage tank. 

NOTE: If a weights and measures official is testing dispensers for compliance with NIST Handbook 44 

using a 19 L (5 gal) test measure, the flush procedure can be skipped and the fuel sample taken after the 

official has filled the measure and determined the device error. 

NOTE: Officials should verify and document the dispenser’s programed blend ratio if they have the 

appropriate access equipment and training from the device manufacturer. This is a good practice to carry 

out on new installations and devices where there is a suspected problem with fuel grades. Instructions for 

accessing the blend ratio of a device are included in the Certificate of Conformance for a blending device 

from the NCWM. The NCWM Certificate of Conformance Search Engine is located at this URL: 

http://www.ncwm.net/ntep/cert_search. 

5.	 Taking a Sample of Fuel for Volatility Measurement 

The vapor pressure of a fuel is affected by evaporation and composition so special handling and filling 

equipment is required. This nozzle sampling procedure is based on ASTM D5842 “Standard Practice for 

Sampling and Handling of Fuels for Volatility Measurement.” 

a.	 If the sample is taken from a blending dispenser, flush the nozzle with 1 L (0.3 gal) of the grade of 

product being sampled. This step is taken to ensure the hose and nozzle is not contaminated with a 

blend of fuel different from that intended to be tested. 

The official should then: 

b.	 Rinse the sample container (and sampling device if used) with fuel and allow it to drain before filling. 

This step is taken to ensure the container is not contaminated and it cools the container which may 

help to reduce evaporation. 

c.	 Use a nozzle extender to fill the sample container slowly to 70 % to 80 % of its capacity. The slow 

filling time and nozzle extension are used to reduce evaporation. 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

d.	 Immediately seal the sample container and check it for leaks. If a leak is found discard the sample 

and container and take another sample using a new container. It is recommended that a sealing tape 

be wrapped around the container lid to further reduce the chance of evaporation (See Figure 4 below 

for an example of bottles sealed in this manner). 

NOTE: When glass bottles are used in collecting samples for vapor pressure testing, it is recommended 

that container sealing tape be used to seal the lower edge of the cap to the neck of the bottle to prevent 

evaporation. (This is usually a stretchable tape that reduces the chance for gas exchange and prevents the 

entry of contaminants. These tapes remain flexible in most temperatures and they are waterproof and 

resistant to most chemicals.) If the containers are properly sealed and leak free, they can also be inverted 

during shipment to prevent evaporation. 

Figure 19. Sealing Tape Applied to Amber Sample Bottles 

Photos courtesy of the Missouri Department of Agriculture. 

D. Protecting Fuel Samples 

Extreme care and good judgment are necessary to ensure the samples obtained are representative of the product 

being sold, assuring the test results are the same as if the sample had been tested immediately after it was taken. 

Samples should be kept cool or be cooled and protected from sunlight in order to minimize any potential 

reaction due to the light sensitivity of the sample. Samples of gasoline and JP-4 (which is not widely used) 

should be kept cool to prevent “light ends” from evaporating. Also, samples of fuels with lead additives must 

be protected from sunlight. It is necessary to protect all volatile samples of petroleum products from 

evaporation. In every situation the product sampled should be put directly into a sample container as soon as 

it is obtained. This must be done with vapor pressure samples. When it is necessary to obtain product with a 

sampling apparatus (or it is an undercover purchase in a consumer type gas can), or from an underground 

storage tank, transfer the product to a sample container immediately. If applicable, keep the containers and 

samplers closed except when material is being transferred. Never completely fill any container; allow adequate 

room for expansion by filling them to no more than 80 % capacity. To prevent the loss of liquid and vapors 

during transport, screw the caps of containers down tightly and check for leakage (check for leakage by tilting 

the container on its side and looking for fuel leaks around the cap or air bubbles entering the fuel). 

NOTE: Control temperature conditions. According to ASTM D4814 fuels should not be cooled below their 

dispensed temperatures or 15 °C (59 °F) because cooling of gasoline-oxygenate fuels can produce changes in 

appearance (e.g., hazing) that are not reversed on rewarming. 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing NIST Handbook 158 (2016) 

E. Visual Inspection – (Per ASTM D6751 and ASTM D4814-16a - 6. Workmanship) 

Immediately examine the fuel sample to determine if it is clear and bright at the ambient temperature, at the 

fuel temperature at the point of custody transfer, or at a lower temperature agreed upon by the purchaser and 

seller. The fuel must be visually free of undissolved water, sediment, or suspended matter. If the fuel does not 

pass this visual inspection, a stop-sale order should be issued immediately. 

Label and seal the containers immediately after the sample is obtained and place in a secure sample transport 

box for transportation to the fuel laboratory for testing. The official should RECHECK that every sample is 

accurately identified and documents are completed. If the lab receives a sample with missing or incomplete 

labels or documents, it will be rejected and disposed of without testing. 

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NIST Handbook 158 (2016) Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

Figure 20. Visual Inspection of Samples. 

PASS FAIL 

Clean, Bright Sample Passes Sample with Water Fails 

PASS FAIL 

FAIL PASS 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing	 NIST Handbook 158 (2016) 

F. Transporting Samples to Laboratory 

There are several approaches used to transport fuel and oil samples to a fuel laboratory. All are acceptable as 

long as the integrity of the chain-of-custody is documented. 

1.	 Direct Delivery: The official who collects the sample transports it directly to the laboratory and presents 

it for testing. 

2.	 Public Carrier Delivery: The official who collects the sample packs it in appropriate shipping cartons, 

labels them and delivers them to a public carrier who then transports the sample to the fuel laboratory for 

testing (or to a delivery point where a representative from the laboratory picks up the samples). 

3.	 Laboratory Courier: The officials who collect samples deliver them to a central consolidation point 

where a courier collects the samples and transports them to the fuel laboratory. These couriers are almost 

always employees of the fuel laboratory. 

The collection of fuel samples requires that the fuel official receives a continuous supply of fresh sample 

containers, so it is important to set up a cost effective system that simplifies the transportation of fuel samples 

to the laboratory while at the same time ensures that it resupplies the field official. 

G. Chain of Evidence (Custody) and Transfer 

A chain of evidence (custody) is a record of each person who has come into possession of the fuel sample from 

the time it is taken until the time the test results on the sample are presented as evidence in an administrative or 

judicial proceeding. A sample is in custody if it is in the official’s possession or if it is under his or her control, 

or the control of another authorized person while stored in a secure location. A chain of evidence is the only 

means to prove that the sample presented in the proceeding is the one obtained at the location in question. 

A record must be maintained which lists all those persons coming in possession of the evidence. This is 

particularly true when an analysis of fuel samples is to be made. It must be proven that there was no tampering 

with, alteration, or substitution of the sample between the time it was collected and the time of analysis by the 

fuel laboratory. The burden of proof is on the party offering the sample into evidence. 

Fuel samples must be passed from the field person who obtained them to the laboratory personnel through a 

controlled process. When this takes place, the record must indicate to whom and when the sample was released. 

In other words, the chain of custody must be maintained. This means that the transfer of the sample must be 

documented each time, and that the record must remain with the sample. If this proof is not available, the 

sample and its analysis may be excluded from evidence. 

Although an accurate and complete record is maintained of the chain of custody, it is still advisable that the 

samples go through as few people as possible. The fewer involved, the less chance there is the sample may be 

tampered with, altered, or lost. Also, should a case end up in court or administrative hearing, fewer witnesses 

will be needed to be called to establish the fact that the sample analyzed is the same fuel sample collected at 

the location. See ASTM D4840 “Standard Guide for Sample Chain-of-Custody Procedures” for more 

information. A sample of a Chain-of-Custody document is presented in Appendix C. 

H. Timeliness of Samples 

Due to the velocity at which fuel is sold from a seller’s tanks, a sample that is not analyzed and the results 

provided within 24 hours to 48 hours of its collection is of little value in stopping the sale of nonconforming 

fuel. 

I. Respond to Test Results – Time is of the Essence. 

If a sample fails any laboratory test, immediate action must be taken to ensure the product is removed from 

sale. Follow-up oversight must verify that the seller has taken the appropriate corrective actions including 

determining and documenting the cause of the failure so it can be included in a program assessment to identify 

possibilities for changes in quality standards or handling and storage procedures. Timely testing of all samples 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

is a critical factor because, after subsequent deliveries occur, the sample is no longer representative of the 

product in the storage tank. 

1.	 If the Sample Passes: No enforcement action is taken. The test reports are stored according to the record 

keeping requirements of the enforcement agency and the results are added to the compliance history of the 

seller and cross-referenced to the supplier. All test results are also incorporated into a summary of test 

results which can be analyzed and presented in (annual) reports detailing the benefits of fuel quality testing. 

2.	 If the Sample Fails: 

a.	 Recommended Engine Fuel Off-Sale Guidance: Upon notification from the laboratory that a product 

sample did not meet specifications, the official should go to the location where the sample was 

obtained and contact the manager. It is also appropriate to issue an initial notification of an off-sale 

order by e-mail or by telephone to the location manager and, if appropriate, the corporate office if the 

retailer is a chain store outlet. E-mail notifications of test failures to the seller are the fastest way to 

prevent the sale of out of specification product and initiating corrective actions. 

b.	 Report the test results for the sample, what the specifications for that product are, and what action is 

going to be taken. Refer questions about the test results to the management of the fuel program. Do 

not recommend how to correct or bring the failed fuel into compliance because the agency may be 

held liable should advice be found to be improper. 

The official should: 

(1) If applicable, read and record the pump totalizers and determine the amount of product in the 

storage tank from which the sample was originally taken. 

(2) If additional product has been added to the storage tank since the original sample was taken, 

resample the product, label and seal it and then send it to the laboratory for testing (or if applicable 

retest on-site). 

(3) If additional product has not been added to the storage tank since the sample was collected, label 

and seal the storage tank fill pipe(s) and/or dispenser(s) in accordance with agency policy. 

(4) Explain the agency’s policy on the disposition of off-sale product (e.g., off-sale fuel cannot be 

sold and must be corrected or disposed of within 10 days of off-sale action). Leave a written copy 

of any instructions with the manager. 

(5) If the agency requires the official to be present when the off-sale product is to be removed from 

the tanks, the official should advise the seller to contact his or her office to make an appointment. 

When fuel storage tank(s) are to be pumped out, the official should check the tags and seals 

applied when the product was ordered off sale to see that they are intact. If they are not secure, 

the official should document his or her findings and take action according to agency policy or 

notify management. Also, the official should check the totalizer readings and measure the amount 

of product in the tank to determine if any has been removed. Break the seals and allow the product 

to be pumped out of the storage tank. Have the lines and filters flushed with sufficient compliant 

product to assure all off-specification product is removed before releasing the dispensers for use. 

It is sound procedure to obtain a sample of replacement product from the delivery truck and of 

the new product through the dispenser after it has been emptied into the storage tank so they can 

be tested to ensure the problem has been corrected. 

(6) Verify Product Disposition: The official should require the seller to provide a written explanation 

of how the off-sale product was disposed of. Some questions that may be asked are: How was 

sale of volatile product prevented? Was the product disposed of or returned to supplier? What 

documents or processes confirm the disposition? Was the process completed within 30 days of 

notice? 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing	 NIST Handbook 158 (2016) 

NOTE: Examples of a Notice of Violation and a Stop Sale Order are provided in Appendix C. 

VII. TESTING FOR WATER IN A FUEL STORAGE TANK 

A.	 Storage Tanks 

According to the Steel Tank Institute, the installation of storage tanks and lax maintenance procedures used for 

water monitoring and removal can lead to a number of problems, from degradation of fuel quality and 

subsequent vehicle performance to damage of the storage system. This concern pertains to all storage systems, 

both underground and aboveground, regardless of the material used for their construction and irrespective of 

the fuel stored in the tank. According to Clean-Diesel Org (see http://www.clean-diesel.org/), not only is water 

a problem in itself, but it also creates the environment for biological growth within the fuel. Studies have 

revealed that less than 6.35 mm (0.25 in) of water is more than sufficient to promote microbial growth. 

Microorganisms live at the level of the fuel‐water interface and feed on the fuel. The presence of 

microorganisms can lead to filter plugging, pump and injector problems, deactivation of the water monitor, and 

buildup within the tank, which is costly to remove. 

It is recommended that a manual inspection for water be made on each storage tank at a location, and that every 

jurisdiction enforce the maximum water limits specified in their jurisdiction’s laws or regulations such as those 

specified in NIST Handbook 130, Uniform Engine Fuels and Automotive Lubricants Regulation, Section 4. 

“Retail Storage Tanks and Dispenser Filters.” While most modern storage tank monitoring systems have water 

monitoring features, those may not be accurate, so a manual measurement using a gauge stick with water finding 

paste and calibration chart are recommended. Officials should inspect each automatic system for the level of 

water in each storage tank and document the results on the inspection reports, and compare the automatic 

indication with the manual readings to indicate any significant differences that exist. Officials should take 

action based on the level determined using the stick and water paste that exceed the specified limits (i.e., order 

the water removed by a specified deadline and require seller to report completion of the removal). Whatever 

measuring device the official uses must be capable of measuring the fuel level over the full range of the tank's 

height to the nearest 3 mm (1

/8 in). If the storage system does not have an automatic monitoring system, it is 

recommended that the official conduct a manual inspection for water in each storage tank at each sample 

location and enforce the maximum water limits specified in their jurisdiction’s laws or regulations such as those 

specified in NIST Handbook 130, Uniform Engine Fuels and Automotive Lubricants Regulation, Section 4. 

“Retail Storage Tanks and Dispenser Filters.” 

Section 4. Retail Storage Tanks 

4.1.	 Water in Gasoline-Alcohol Blends, Biodiesel Blends, Ethanol Flex Fuel, Aviation 

Gasoline, and Aviation Turbine Fuel. –No water phase greater than 6 mm (1⁄4 in) as 

determined by an appropriate detection paste or other acceptable means, is allowed to 

accumulate in any tank utilized in the storage of gasoline-alcohol blend, biodiesel, 

biodiesel blends, ethanol flex fuel, aviation gasoline, and aviation turbine fuel. 

4.2.	 Water in Gasoline, Diesel, Gasoline-Ether, and Other Fuels. –Water shall not exceed 

25 mm (1 in) in depth when measured with water indicating paste or other acceptable 

means in any tank utilized in the storage of diesel, gasoline, gasoline-ether blends, and 

kerosene sold at retail except as required in Section 4.1. Water in Gasoline-Alcohol 

Blends, Biodiesel Blends, Ethanol Flex Fuel, Aviation Gasoline, and Aviation Turbine 

Fuel. 

1.	 Equipment: The Environmental Protection Agency specifies the following requirement for gauge sticks 

and other water measuring systems: 

2.	 Gauge Stick or Other Gauges: The gauge stick used to measure the depth of liquid in an underground 

tank must be clearly labeled in 3 mm (1

/8 in) graduations starting with zero at the bottom end. Inspect the 

stick to ensure the end has not been worn or cut off and that the stick is not warped. The stick should be 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

made of non-sparking material, such as wood, and varnished to minimize the creeping of fuel above the 

actual fuel level in the tank. Whatever measuring device the official uses must be capable of measuring 

the fuel level over the full range of the tank's height to the nearest 3 mm (1

/8 in). 

3.	 Water Finding Paste: The best way to measure water is to use water-finding paste that is applied to the 

bottom of a gauge stick (when testing fuel that contains ethanol, use a water paste that is formulated for 

use with blend gasolines). Follow the paste manufacturer’s directions for using the water paste, especially 

the amount of time the stick needs to be immersed in the fuel and what color change indicates the presence 

of water. 

NOTE: It is a good idea to take a photograph of the stick after applying the paste and another photo with the 

stick and a measuring tape laid next to it to indicate the water level if excessive water is found. 

NOTE: Read the paste manufacturer’s Safety Data Sheet for warnings and storage requirements, and follow 

the exposure controls and personal protection equipment requirements. 

4.	 Procedure: The manual way of measuring the amount of water in an underground tank is with a wooden 

gauge stick. To take a reading, apply a thin film of the water finding paste on one side of the stick and its 

bottom and spread it uniformly over the surface to a height of 100 mm (4 in). Lower the stick gently to 

the bottom of the tank and let it sit for 5 seconds to 10 seconds (or follow the paste manufacturer’s 

instructions if they differ from this recommendation) and then raise it quickly. Locate the paste and 

determine if there is any change in the color of the paste which would indicate that water is present. Record 

the number of millimeters (inches) of water indicated to the nearest 3 mm (1

/8 in). 

For manual gauging, if there is no separate gauge opening, the tank‐fill drop tubes must have no obstruction 

at the end of the tube which will interfere with gauging of water. Be aware of drop tubes with “floating 

striker plates” – these devices won’t show the lowest 19 mm (0.75 in) of the tank. 

5.	 Action: If the permitted water limit is exceeded, issue an order that the seller have the water removed. 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing	 NIST Handbook 158 (2016) 

Figure 21. Testing for Water.	 Figure 22. Stick with Paste – No Water Indicated. 

Figure 23. Sticks with Red Coloring that Shows Water Levels in Different Storage Tanks. 

VIII.	 LABELING ENFORCEMENT CHECKLIST AND SAMPLING PROCEDURE 

OUTLINE FOR TAKING SAMPLES OF MOTOR OIL AT SERVICE 

LOCATIONS 

A.	 Preparation 

1.	 Contact: Officials should park their vehicle in a suitable location until they have notified the 

management of the business where sampling will occur of their identity, authority, and nature of the visit. 

When sampling at retail locations, is it often necessary to have the oil dispensers unlocked or air 

compressors started so samples can be taken. Officials must establish contact with the authorized 

management representative and explain how samples will be taken and ensure that employees understand 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

what is expected of them in assisting the official. It is management’s right to observe sampling 

procedures and to be present during the sample collection process if they choose to do so. This will allow 

the person to confirm the source of the oil and identity of the container and enable them to satisfy 

themselves that the sample container was properly sealed and purged product was returned to the proper 

storage. 

2.	 Business Information: Obtain the business ownership and other identity information. 

3.	 Labeling: Ensure that the label on any vehicle engine (motor) oil container, receptacle, dispenser, or 

storage tank is properly labeled. In addition, if remote tank filling ports are used, it is recommended that 

they be properly marked and secured. If there is any doubt, the official should ask the manager to indicate 

the location of the appropriate storage tank for each grade or brand of oil. 

B.	 Labeling and Documentation 

If the official’s state adopts the Uniform Method of Sale of Commodity Regulation in NIST Handbook 130, 

carry out an inspection according to Section 2.33 “Labeling of Vehicle Engine (Motor) Oil.” 

2.33. Oil. 

2.33.1. Labeling of Vehicle Engine (Motor) Oil. – Vehicle engine (motor) oil shall be labeled. 

2.33.1.1. Viscosity. – The label on any vehicle engine (motor) oil container, receptacle, 

dispenser, or storage tank, and any invoice or receipt from service on an engine that includes 

the installation of vehicle engine (motor) oil dispensed from a receptacle, dispenser, or 

storage tank, shall contain the viscosity grade classification preceded by the letters “SAE” 

in accordance with SAE International’s latest version of SAE J300, “Engine Oil Viscosity 

Classification.” 

NOTE: If an invoice or receipt from service on an engine has limited room for identifying the 

viscosity, brand, and service category, then abbreviated versions of each may be used on the 

invoice or receipt and the letters “SAE” may be omitted from the viscosity classification. 

2.33.1.1. Viscosity – Are the following labeled with the viscosity 

grade classification preceded by the letters “SAE” in accordance with 

SAE International’s latest version of SAE J300, “Engine Oil Viscosity 

Classification?” 

Yes No Comments 

a. Containers 

b. Receptacles 

c. Dispensers 

d. Storage Tanks 

e. Invoice or Receipts 

2.33.1.2. Brand. – The label on any vehicle engine (motor) oil container and the invoice or 

receipt from service on an engine that includes the installation of bulk vehicle engine (motor) 

oil dispensed from a receptacle, dispenser, or storage tank shall contain the name, brand, 

trademark, or trade name of the vehicle engine (motor) oil. 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing NIST Handbook 158 (2016) 

2.33.1.2. Brand. – Are the following labeled with the name, 

brand, trademark, or trade name of the vehicle engine (motor) 

oil? 

Yes No Comments 

a. Containers 

b. Receptacles 

c. Dispensers 

d. Storage Tanks 

e. Invoice or Receipts 

2.33.1.3. Engine Service Category. – The label on any vehicle engine (motor) oil container, 

receptacle, dispenser, or storage tank and the invoice or receipt from service on an engine 

that includes the installation of bulk vehicle engine (motor) oil dispensed from a receptacle, 

dispenser, or storage tank shall contain the engine service category, or categories, displayed 

in letters not less than 3.18 mm (1/8 in) in height, as defined by the latest version of SAE J183, 

“Engine Oil Performance and Engine Service Classification (Other than “Energy 

Conserving”),” API Publication 1509, “Engine Oil Licensing and Certification System,” 

European Automobile Manufacturers Association (ACEA), “European Oil Sequences,” or 

other Vehicle or Engine Manufacturer standards as approved in Section 2.33.1.3.1. “Vehicle 

or Engine Manufacturer Standard.” 

2.33.1.3. Engine Service Category. – Are the following 

labeled with the engine service category, or categories? Yes No Comments 

a. 

Containers 

Height of the letters at least 3.18 mm (1/8 in)? 

b. Receptacles 

Height of the letters at least 3.18 mm (1/8 in)? 

c. 

Dispensers 

Height of the letters at least 3.18 mm (1/8 in)? 

d. Storage Tanks 

Height of the letters at least 3.18 mm (1/8 in)? 

e. 

Invoice or Receipts 

Height of the letters at least 3.18 mm (1/8 in)? 

2.33.1.3.1. Vehicle or Engine Manufacturer Standard. – The label on any vehicle 

engine (motor) oil container, receptacle, dispenser, or storage tank and the invoice or 

receipt from service on an engine that includes the installation of vehicle engine (motor) 

oil dispensed from a receptacle, dispenser, or storage tank shall identify the specific 

vehicle or engine manufacturer standard, or standards, met in letters not less than 

3.18 mm (1/8 in) in height. If the vehicle (motor) oil only meets a vehicle or engine 

manufacturer standard, the label must clearly identify that the oil is only intended for 

use where specifically recommended by the vehicle or engine manufacturer. 

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NIST Handbook 158 (2016) Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

2.33.1.3.1. Vehicle or Engine Manufacturer Standard. – Are 

the following labeled with the specific vehicle or engine 

manufacturer standard, or standards the oil meets? 

NOTE: If the oil only meets a vehicle or engine manufacturer 

standard, the label must clearly identify that the oil is only intended 

for use where specifically recommended by the vehicle or engine 

manufacturer. 

Yes No Comments 

a. 

Containers 

Height of the letters at least 3.18 mm (1/8 in)? 

b. Receptacles 

Height of the letters at least 3.18 mm (1/8 in)? 

c. 

Dispensers 

Height of the letters at least 3.18 mm (1/8 in)? 

d. Storage Tanks 

Height of the letters at least 3.18 mm (1/8 in)? 

e. 

Invoice or Receipts 

Height of the letters at least 3.18 mm (1/8 in)? 

2.33.1.3.2. Inactive or Obsolete Service Categories. – The label on any vehicle engine 

(motor) oil container, receptacle, dispenser, or storage tank and the invoice or receipt 

from service on an engine that includes the installation of bulk vehicle engine (motor) 

oil dispensed from a receptacle, dispenser, or storage tank shall bear a plainly visible 

cautionary statement in compliance with the latest version of SAE J183, Appendix A, 

whenever the vehicle engine (motor) oil in the container or in bulk does not meet an 

active API service category as defined by the latest version of SAE J183, “Engine Oil 

Performance and Engine Service Classification (Other than “Energy Conserving”).” If 

a vehicle engine (motor) oil is identified as only meeting a vehicle or engine 

manufacturer standard, the labeling requirements in Section 2.33.1.3.1. Vehicle or 

Engine Manufacturer Standard applies. 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing NIST Handbook 158 (2016) 

2.33.1.3.2. Inactive or Obsolete Service Categories. – Do the 

following bear a cautionary statement in compliance with the latest 

version of SAE J183, Appendix A, whenever the vehicle engine (motor) 

oil in the container or in bulk does not meet an active API service 

category as defined by the latest version of SAE J183, “Engine Oil 

Performance and Engine Service Classification (Other than “Energy 

Conserving”).” If a vehicle engine (motor) oil is identified as only 

meeting a vehicle or engine manufacturer standard, the labeling 

requirements in Section 2.33.1.3.1. Vehicle or Engine Manufacturer 

Standard applies. 

Yes No Comments 

a. 

Containers 

Is the cautionary statement plainly visible? 

b. Receptacles 

Is the cautionary statement plainly visible? 

c. 

Dispensers 

Is the cautionary statement plainly visible? 

d. Storage Tanks 

Is the cautionary statement plainly visible? 

e. 

Invoice or Receipts 

Is the cautionary statement plainly visible? 

2.33.1.4. Tank Trucks or Rail Cars. – Tank trucks, rail cars, and other types of delivery 

trucks that are used to deliver bulk vehicle engine (motor) oil are not required to display the 

SAE viscosity grade and service category or categories on such tank trucks, rail cars, and 

other types of delivery trucks. 

2.33.1.5. Documentation. – When the engine (motor) oil is sold in bulk, an invoice, bill of 

lading, shipping paper, or other documentation must accompany each delivery. This 

document must identify the quantity of bulk engine (motor) oil delivered as defined in Sections 

2.33.1.1. Viscosity; 2.33.1.2. Brand; 2.33.1.3. Engine Service Category; the name and 

address of the seller and buyer; and the date and time of the sale. For inactive or obsolete 

service categories, the documentation shall also bear a plainly visible cautionary statement 

as required in Section 2.33.1.3.2. Inactive or Obsolete Service Categories. Documentation 

must be retained at the retail establishment for a period of not less than one year. 

2.33.1.5. Documentation Requirements Yes No Comments 

a. Invoice 

i. Does the seller provide an invoice? 

ii. Is the date and time of sale included? 

iv. Is the seller name and address included? 

v. Is the buyer name and address included? 

vi. Does it identify the quantity of bulk oil delivered? 

vii. 

2.33.1.1. Viscosity. – Does it include the viscosity grade 

classification preceded by the letters “SAE” in accordance with 

SAE International’s latest version of SAE J300, “Engine Oil 

Viscosity Classification”? 

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NIST Handbook 158 (2016) Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

2.33.1.5. Documentation Requirements Yes No Comments 

viii. 2.33.1.2. Brand. – Does it include the name, brand, trademark, or 

trade name of the vehicle engine (motor) oil? 

ix. 2.33.1.3. Engine Service Category. – Does it include engine 

service category, or categories? 

x. 

2.33.1.3.2. Inactive or Obsolete Service Categories. – If 

applicable, includes a cautionary statement in compliance with the 

latest version of SAE J183, Appendix A. 

xi. Is the document retained at retail business for at least one year? 

b. Bill of Lading 

i. Does the seller provide a Bill of Lading? 

ii. Is the date and time of sale included? 

iv. Is the seller name and address included? 

v. Is the buyer name and address included? 

vi. Does it identify the quantity of bulk oil delivered? 

vii. 

2.33.1.1. Viscosity. – Does it include the viscosity grade 

classification preceded by the letters “SAE” in accordance with 

SAE International’s latest version of SAE J300, “Engine Oil 

Viscosity Classification”? 

viii. 2.33.1.2. Brand. – Does it include the name, brand, trademark, or 

trade name of the vehicle engine (motor) oil? 

ix. 2.33.1.3. Engine Service Category. – Does it include the engine 

service category, or categories? 

x. 

2.33.1.3.2. Inactive or Obsolete Service Categories. – If 

applicable, includes a cautionary statement in compliance with the 

latest version of SAE J183, Appendix A. 

xi. Is the document retained at retail business for at least one year? 

c. Shipping paper or other documentation. 

i. Does the seller provide other shipping paper? 

ii. Is the date and time of sale included? 

iv. Is the seller name and address included? 

v. Is the buyer name and address included? 

vi. Does it identify the quantity of bulk oil delivered? 

vii. 

2.33.1.1. Viscosity. – Does it include the viscosity grade 

classification preceded by the letters “SAE” in accordance with 

SAE International’s latest version of SAE J300, “Engine Oil 

Viscosity Classification”? 

viii. 2.33.1.2. Brand. – Does it include the name, brand, trademark, or 

trade name of the vehicle engine (motor) oil? 

ix. 2.33.1.3. Engine Service Category. – Does it include the engine 

service category, or categories? 

x. 

2.33.1.3.2. Inactive or Obsolete Service Categories. – If applicable, 

includes a cautionary statement in compliance with the latest 

version of SAE J183, Appendix A. 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing NIST Handbook 158 (2016) 

2.33.1.5. Documentation Requirements Yes No Comments 

xi. Is the document retained at retail business for at least 1 year? 

xii. Does the seller provide an invoice? 

3.13.2. Labeling of Recreational Motor Oil. 

3.13.2.1. Viscosity. – The label on each container of recreational motor oil shall contain 

the viscosity grade classification preceded by the letters “SAE” in accordance with the SAE 

International’s latest version of SAE J300, “Engine Oil Viscosity Classification.” 

3.13.2.2. Intended Use. – The label on each container of recreational motor oil shall 

contain a statement of its intended use in accordance with the latest version of SAE J300, 

“Engine Oil Viscosity Classification.” 

3.13.2. Labeling of Recreational Motor Oil. 

3.13.2.1. Viscosity. –The label on each container of recreational motor oil 

shall contain the viscosity grade classification preceded by the letters 

“SAE” in accordance with the SAE International’s latest version of 

SAE J300, “Engine Oil Viscosity Classification.” 

Yes No Comments 

a. 

Containers: 

Is the viscosity grade classification provided and is it preceded by 

the letters “SAE.” 

3.13.2. Labeling of Recreational Motor Oil. 

3.13.2.2. Intended Use. – The label on each container of recreational 

motor oil shall contain a statement of its intended use in accordance with 

the latest version of SAE J300, “Engine Oil Viscosity Classification.” 

Yes No Comments 

a. 

Containers: 

Does the label contain a statement of its intended use? 

C. Payment for Samples 

In most jurisdictions, the official is obligated to pay the retail value of the product if a fuel sample is taken from 

a place of business where it can be sold legally unless the sample is being collected pursuant to a search warrant, 

or the fuel’s owner surrenders the sample at no cost. 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

PAYMENT RECEIPT 

Agency Responsible for Engine Fuel Quality 

Address, 

City, State, Zip 

Telephone, E-mail, URL 

Seller’s Name: Address: Date: 

Received $___________________as payment for the fuel or oil samples described below taken for inspection 

purposes as provided for by Chapter xx-xx of the Code of the State of ___________________. 

__________________________________________________ 

Signature of Business Representative 

Sample Taken: Official: 

D. Taking Oil Samples 

1.	 Packaged Engine (Motor) Oil: Motor oil is typically packaged in 946 mL (1 qt) and larger containers. 

Sample packages are usually taken at retail locations from a lot of containers offered for sale on the shelf. 

To obtain a sample of packaged motor oil, select one package from the lot and either purchase it or provide 

the seller with an evidence receipt. Apply a sample identity label (do not cover label information) to the 

package and document the business location, date, time of purchase, identity, and other information about 

the sample on an official report form, and document the chain-of-custody. Secure, protect, and ship or 

transfer to the quality laboratory. 

2.	 Nozzle Samples. 

a.	 Sample Container and Sample Size: Use a clean sample container that has a secure cap. See the 

following table. 

Suggested Container Types and Minimum Sample Sizes for Motor Oil 

Product 

Container Material 

Minimum 

Sample Size 

Glass

Aluminum

Metal

FHDPB

“Plastic”1 

Engine (motor) Oil – General YES YES YES YES 1 L 

NOTE 1: Fluorinated High-Density Polyethylene Bottles (FHDPB) are available in wide mouth sizes and are 

fluorinated inside and outside for improved barrier properties and reduced solvent absorption and penetration. 

Fluorination enhances long-term container performance and prevents or reduces permeation loss. Useful with 

most aggressive organic solvents, they are durable and puncture-resistant. 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing NIST Handbook 158 (2016) 

b. Sample Collection 

c. Identifying Samples for Traceability: The following information illustrates the type of information 

typically collected for an oil sample. It is acceptable to either permanently mark the sample container 

with a unique identifying number or to apply a label to the container with a unique number. An Oil 

Sample Data Sheet should be prepared and included with the sample in a shipping container or sample 

case. This information can also be collected directly in a database or entered on a data sheet. 

Regardless of the system used, the following is a compilation of the information usually collected for 

an oil sample. 

Examples of Entries on an Oil Sample Data Sheet 

Item Entry 

1. Sample number/unique container 

identity 

Enter the sample container’s unique identifier number. Each 

sample must have a unique identifier such as a number or alpha 

numeric code so that its handling can be traceable and so that all 

collection reports and laboratory tests are linked to the original 

sample. 

2. Product Identification – Viscosity 

grade, Service Category }Obtained from device label, tank marking, or bill of lading. 

3. Brand 

4. Sampling location identity 

Enter business name, identifier number (this may be assigned by 

the fuel regulatory agency), address of sample location, business 

mail address, agent name, telephone, fax, and email. This 

information may be used to immediately notify the seller to 

remove the oil from sale if the sample fails. 

5. Sampled lot Amount of oil that the sample represents. Total liters or gallons 

in the source oil storage tank represented by the sample. 

6. Supplier(s) of oil Enter the name of the supplier or suppliers of the oil in the source 

storage tank. 

7. Date of last oil delivery to storage 

tank. 

Enter the day of the latest delivery of the oil into the storage tank 

from which the sample was taken. 

8. Sample Taken by Name (or identifier number) of the official who took the sample. 

9. Source of sample 

Identify the specific source of the sample (e.g., dispenser 

number, storage tank number or location, or license number of 

tank truck and compartment number). 

10. Date/Time sample collected Enter the time of day, day, month and year indicating when the 

sample was collected. 

11. Sample Type Nozzle or other collection method 

12. Notes/Safety Notice 

Enter weather conditions and any remarks necessary to 

accomplish the analysis of the sample. Safety warning label. 

13. Security Seal(s) Enter the identification number of any security seal applied to a 

sample container or transport case. 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

Figure 24. Brand and Viscosity on a Dispenser. Figure 25. Taking Oil Samples – Metal Cans. 

Photo courtesy of North Carolina Department of 

Agriculture and Consumer Services. 

d.	 Sampling 

(1) Sample Taken from a Measuring Device that Dispenses a Single Product:	 Typically no 

flushing is required for these single product nozzle-hose combinations if they are protected from 

contamination. If the official is taking a sample from an oil dispenser covered with an 

accumulation of dirt and oil, take care to clean the nozzle to ensure that dirt and debris are not 

introduced to the container. It may be necessary to first run enough oil into another container to 

ensure the nozzle is dispensing uncontaminated oil. 

When bulk storage is used, one aspect to look at is the accuracy and clarity of the markings of storage 

tanks and remote fill openings to avoid the possibility of cross-mixing or contamination. Storage 

conditions affect the shelf-life of most lubricants so officials should determine if the seller is aware 

of the manufacturer’s recommendations. If no shelf-life guidance is provided and the lubricant is 

greater than two-years old, the seller should contact the manufacturer for guidance about the 

suitability of the oil for use. Most oils are not affected by normal storage temperatures but sometimes 

storage tanks can be located too near heat sources, which may create situations that cause oil additives 

to oxidize prematurely. 

- Operate oil meters/fillers manually and do not use automatic pre-set delivery features when 

collecting oil samples. 

- If the oil meter/filler control is equipped with a totalizing device, the official should record the 

product identity and the before and after readings on the sample collection report. 

SKIN INJECTION HAZARD: Some oil delivery systems operate under high-pressure. Fluids 

spraying from dispenser valves, hose leaks, or ruptured components may send out spray that may 

pierce skin and cause serious injuries and long term health consequences (e.g., oil, chemicals and dirt 

can be injected under the skin). The official should wear personal protective equipment and, should 

an injury occur, he or she should seek immediate medical attention. The official should never point 

a dispenser valve at anyone or at any part of his or her body or put a hand over the end of a nozzle 

while opening or operating the flow valve regardless of its operating pressure. 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing	 NIST Handbook 158 (2016) 

i.	 The official may hold the sample container or place it on a solid level surface adjacent to the 

dispenser. 

The official should then: 

ii.	 Use a cotton rag to wipe and clean the parts of the nozzle that comes into contact with the 

sample container and oil sample. 

iii.	 Ensure the dispenser is operational (e.g., air supply is turned on) and, if required, have the 

dispenser authorized. 

iv.	 Place the nozzle/outlet in the sample container and fill it slowly. Continue until it is filled to 

the specified volume (or the dispenser indicates the quantity specified for the sample). 

v.	 Seal the sample container and mark as required. 

vi.	 Record the sample information on an official report and document the details needed to start 

the chain of custody process. 

vii.	 Issue a Notice of Violation for any labeling violations found during the inspection. An 

example of a Notice of Violation is provided in Appendix C. 

e.	 Protecting and Transporting the Sample 

(1) Protecting Samples:	 The samples should be kept cool and be protected from ultraviolet light to 

prevent deterioration and mishandling. A shipping carton or hard-shell sample transport case 

similar to those used to protect fuel samples may be used. 

(2) Transporting Samples:	 Transport the sample and related documentation to the quality 

laboratory in a timely manner in accordance with agency procedures. This is important because, 

after subsequent deliveries occur, the sample is no longer representative. 

f.	 Documentation – Collecting Information: Throughout a visit, it is important that officials collect 

information about device labeling and other signage to document the identity and other claims made 

by a seller about the oil being sampled. It is good to record a brief description of actions and 

observations as well as recording any relevant information provided by the seller. Taking notes, 

photographs and keeping logs, provide permanent records of a sampling activity and facilitate 

enforcement. 

g.	 Follow through actions: See IX. “Respond to Test” In the fuel sampling outline for guidance on 

how to respond to test results and initiating stop sale actions. 

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NIST Handbook 158 (2016) Field Sampling Procedures for Fuel and Motor Oil Quality Testing 

APPENDIX A. – MONTHLY SAFETY AND HEALTH 

EQUIPMENT CHECKLIST 

Safety and Health Equipment Checklist 

Notice: Reorder replacements immediately after they are used or damaged. 

Date: Official: 

Item: 

InspectedReplace

Comment: 

• Condition? 

• What type or brand is needed and how 

many? 

1. Safety Clothing/Vest 

2. Steel-Toed Shoes or Boots 

3. Eye/Face Protection 

4. Gloves 

5. Respirator/Filters, Dust Mask 

6. Eye-Wash Kit and Solution 

7. Safety Flashlight/Batteries 

8. Safety/Non-sparking Tools 

9. Traffic Cones 

10. Fire Extinguisher (recharge or replace 

immediately after use) 

Expiration Date: 

11. First-Aid Kit 

12. Safety Fuel Storage Can 

13. Digital Camera (data card/battery) 

14. Oil Spill Kit – (absorbent , wipes) 

15. Lint Free Wiping Cloths 

16. Vehicle Emergency Triangles 

17. Rain Suit/Weather Clothing 

18. Hardhat 

19. 

20. 

21. 

22. 

23. 

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Safety and Health Equipment Checklist 

Notice: Reorder replacements immediately after they are used or damaged. 

24. 

Other Equipment Needed: 

25. Other Supplies Needed: 

Questions: 

• Does the equipment fit properly and is it clean, sanitary and serviceable? 

• Are there rips, tears, or cuts that reduce usability of the item? 

• Does it require regular replacement or recharging? Is it stored properly and is it easily accessible? 

• Have you been trained in proper use? 

• Have you read the Safety Data Sheets (SDSs) for fuel products within the last 180 days? 

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NIST Handbook 158 (2016) Field Sampling Procedures for Fuel and Motor Quality Testing 

APPENDIX B. – EXAMPLES OF FUEL SAMPLING AND 

CHAIN-OF-CUSTODY REPORTS 

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APPENDIX C. – EXAMPLES OF NOTICE OF VIOLATION 

AND STOP SALE REPORTS 

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NIST Handbook 158 (2016)	 Field Sampling Procedures for Fuel and Motor Quality Testing 

APPENDIX D. – REFERENCES AND 

ACKNOWLEDGMENTS 

1.	 “Fuel and Fuel System Microbiology: Fundamentals, Diagnosis, and Contamination Control” (2003) – (47 

pages) Frederick J. Passman, Editor. ASTM International Manual Series: Manual 47. 

2. “Petroleum Laboratory Testing and Operations” (1997) – Field Manual 10-67-2 Headquarters Department of 

the Army. 

3.	 NCWM Publication 21 – “Petroleum Products – Sampling Procedures and Safety Manual” (1997) – National 

Conference on Weights and Measures. 

4.	 NFPA 77 “Recommended Practice on Static Electricity” (2014) – National Fire Protection Association. 

5.	 API Recommended Practice 2003 – 7th Edition “Protections Against Ignitions Arising Out of Static, Lightning 

and Stray Currents” (2008). 

6.	 ASTM D6759 - 09 “Standard Practice for Sampling Liquids Using Grab and Discrete Depth Samplers” 

7.	 “Biodiesel Handling and Use Guide” (4th Edition) (2009) – National Renewable Energy Laboratory - REL/TP540-43672 

8.	 “7-29 Ignitable Liquid Storage in Portable Containers” – Factory Mutual - Global Property Loss Prevention 

Data Sheets – Access free with registration and available at 

https://www.fmglobal.com/FMGlobalRegistration/Default.aspx . This site was accessed on 10/30/2014. 

9.	 Underwriters Laboratory # 30 “Standard for Metal Safety Cans.” This standard is available at http://ul.com/ 

Accessed 10/30/2014. 

10.	 “Methanol Safe Handling Manual” (2013). This manual was published by the Methanol Institute and it is 

available at http://www.methanol.org/Health-And-Safety/Safe-Handling/Methanol-Safe-HanldingManual.aspx . This site was accessed on 10/30/2014. 

11.	 ASTM D5842-14 - “Manual of Petroleum Measurement Standards (MPMS) Chapter 8.4” & ASTM D5842 ­

“Standard Practice for Sampling and Handling of Fuels for Volatility Measurement.” 

12.	 Manual of Petroleum Measurement Standards – Chapter 8.1 “Standard Practice for Manual Sampling of 

Petroleum and Petroleum Products” Fourth Edition (2013). American Petroleum Institute. 

13.	 “Aviation Fuels Technical Review (FTR-3)” – (2004) Chevron Global Aviation – Chevron Products Company, 

Houston Texas. 

14.	 “Draft Fuel Sampling Procedures” (2013) – Written by the Colorado Division of Oil and Public Safety. 

15.	 ASTM D4840-99 (2010) “Standard Guide for Sample Chain-of Custody Procedures.” 

16.	 ASTM D5854-15“Standard Practice for the Mixing and Handling of Liquid Samples of Petroleum and 

Petroleum Products.” (2015) 

17.	 NIST Handbook 44 “Specifications Tolerances and other Technical Requirements for Commercial Weighing and 

Measuring Devices” (2016). 

18.	 European Standard – I.S. EN 14275:2013 “Automotive Fuels - Assessment of Petrol and Diesel Fuel Quality ­

Sampling from Retail Site Pumps and Commercial Site Fuel Dispensers” (2013). 

19.	 European Standard – I.S. EN ISO 3170:2004 “Petroleum Liquids – Manual Sampling” (2004). 

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Field Sampling Procedures for Fuel and Motor Oil Quality Testing	 NIST Handbook 158 (2016) 

20.	 Training Module – Twelve: “Petroleum Products.” This training document was published by the California 

Division of Measurement Standards (2002). 

21.	 Australia – Division 5.2 Under Subsection 58(A) procedures related to the collection of fuel samples (2013). 

22.	 Standard Operating Procedure – Seven – “Sample Preservation, Storage, Handling and Documentation.” This 

is a publication of the U.S. Environmental Protection Agency (Revision 2.0, 2003). 

23.	 Chain of Custody Form (COC) - Colorado Department of Labor and Employment – Division of Oil and Public 

Safety. This form is provided in this handbook as an example. 

24.	 API Standard 1512 (1st Edition) “Petroleum Test Laboratory Accreditation Program” (October 1995). This 

standard is published by the American Petroleum Institute. 

25.	 ASTM D4814 – 16a “Standard Specification for Automotive Spark-Ignition Engine Fuel.” (2016) 

26.	 ASTM D4306 – 15 “Standard Practice for Aviation Fuel Sample Container for Tests Affected by Trace 

Contamination” (2015). 

27.	 ASTM D4953 – 15 “Standard Test Method for Vapor Pressure of Gasoline and Gasoline-Oxygenate Blends 

(Dry Method) (2015). 

28.	 NIST Handbook 130 “Uniform Laws and Regulations in the Areas of Legal Metrology and Engine Fuel 

Quality” (2016). 

29.	 “Ethanol-Water Phase Separation White Paper” by Samir Jain. Published by Veeder-Root. Accessed at 

http://nationalpetroleum.net/Ethanol-Water-Phase-Separation-facts.pdf on December 11, 2014. 

30.	 “Keeping Water Out of Your Storage System.” Steel Tank Institute (2005). Accessed on December 12, 2014, 

at http://www.steeltank.com/Portals/0/pubs/KeepingWaterOutofYourStorageSystem_updated%20_2_.pdf 

31.	 “Guidance for Underground Storage Tank Management at ULSD Dispensing Facilities” by Clean-Diesel Org. 

Accessed on December 12, 2014 at http://www.cleandiesel.org/pdf/GuidanceforUndergroundStorageTankManagement_FINAL.pdf 

32.	 “Operating and Maintaining Underground Storage Tank Systems: Practical Help and Checklists” by the 

Environmental Protection Agency. Accessed on December 12, 2014 at 

http://www.epa.gov/oust/pubs/ommanual.htm 

33.	 “Manual Tank Gauging – For Small Underground Storage Tanks” by the Environment Protection Agency. 

Accessed on December 12, 2014 at http://www.epa.gov/swerust1/pubs/manltank.pdf 

34.	 “Tank Smart – Daily Inventory and Statistical Inventory Analysis.” Module 11 – Maine Department of 

Environmental Protection. Accessed on December 12, 2014 at http://www.maine.gov/dep/waste/tanksmart/ 

documents/TankSmart_Mod.11_DI&SIA.pdf 

35.	 Photos – several of the photographs of fuel and fuel and water mixtures and field sampling equipment were 

provided by the Missouri Department of Agriculture’s Fuel Quality Program. 

36.	 Sample Collection and Summary Report – Courtesy of the Georgia Department of Agriculture – Fuel Oil 

Laboratory. 

37.	 ASTM D6224-09 “Standard Practice for In-Service Monitoring of Lubricating Oil for Auxiliary Power Plant 

Equipment.” 

38.	 API 1525A “Bulk Engine Oil Chain of Custody and Quality Documentation.” First Edition, (2012). 

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39.	 “Crime Scene Investigation – A Guide for Law Enforcement” (2013). National Forensic Science Technology 

Center in which NIST participants. 

40.	 ASTM D7464-14 “Standard Practice for Manual Sampling of Liquid Fuels, Associated Materials and Fuel 

System Components for Microbiological Testing.” 

41.	 Material Safety Data Sheet – “High Mileage Motor Oil 10W30” from the Valvoline Company. 

42.	 ASTM D2699-15a “Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel.” 

43.	 ASTM D2700-16 “Standard Test Method for Motor Octane Number of Spark-Ignition Engine Fuel.” 

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