Integrated Pest Management: Conducting Urban Rodent Surveys i

Suggested citation: Centers for Disease Control and Prevention. Integrated pest management: conducting urban 

rodent surveys. Atlanta: US Department of Health and Human Services; 2006.

Use of trade names is for identification only and does not imply endorsement by the Centers for Disease Control 

and Prevention, the Public Health Service, or the U.S. Department of Health and Human Services.
Contents
 

Introduction..................................................................................................................................................1
 

IPM Basics....................................................................................................................................................1
 

Definition and Philosophy ....................................................................................................................1
 

Program Components...........................................................................................................................2
 

Characteristics of Urban Rodent Surveys.......................................................................................................2
 

Basic Units in the Operational Program ........................................................................................................3
 

Sample Versus Comprehensive Surveys..........................................................................................................4
 

Personnel Requirements ................................................................................................................................4
 

Survey Procedures .........................................................................................................................................5
 

Sample Survey Methodology.................................................................................................................5
 

Survey Crews and Equipment...............................................................................................................6
 

Premises Inspection—Exterior ..............................................................................................................7
 

Premises Inspection—Interior...............................................................................................................8
 

Instructions for Completing the Block Record (Exterior Inspection) Form....................................................8
 

Premises Address...................................................................................................................................9
 

Premises Type ......................................................................................................................................9
 

Premises Details....................................................................................................................................9
 

Food ...................................................................................................................................................10
 

Water..................................................................................................................................................12
 

Harborage...........................................................................................................................................12
 

Entry and Access.................................................................................................................................14
 

Active Signs ........................................................................................................................................14
 

Remarks..............................................................................................................................................14
 

Interior Inspection Using a Modified Block Record (Exterior Inspection) Form .........................................14
 

Premises Type ....................................................................................................................................15
 

Premises Details .................................................................................................................................15
 

Food ...................................................................................................................................................15
 

Water .................................................................................................................................................15
 

Harborage ..........................................................................................................................................15
 

Entry and Access ................................................................................................................................15
 

Active Signs ........................................................................................................................................15
 

Remarks .............................................................................................................................................15
 

GIS and Mapping .......................................................................................................................................16
 

Interior Tolerance Limits.............................................................................................................................17
 

Selected References......................................................................................................................................18
 

Appendix A—Survey Forms........................................................................................................................19
 

Integrated Pest Management: Conducting Urban Rodent Surveys i
Integrated Pest Management: Conducting Urban Rodent Surveys ii
This manual is for classroom use and for field 

training of program managers, environmental health 

practitioners, inspectors, outreach workers, and others 

who work in community-based rodent integrated pest 

management programs. The manual is also a reference 

for survey techniques and for the preparation of reports 

and maps.

Introduction

For centuries, people have recognized that rats and 

mice are not only a nuisance but are a public health 

problem. Rats and mice damage and contaminate food, 

damage structures, and carry diseases that threaten 

health and quality of life, and they can cause injury 

and death. This manual describes techniques to help 

us protect ourselves from these disease vectors by 

gathering information (surveillance) about infestations 

and about the causative conditions of infestation. 

Accurate recordkeeping by public health officials 

provides the information needed to manage rodent and 

other pest problems.

Urban rodent surveys of exterior areas are the primary 

means for obtaining information on rodent infestations 

and on premises with environmental health deficiencies 

that support commensal rodent populations in 

housing and on premisess. Survey areas should include 

residential, commercial, and civic buildings; vacant lots; 

and public areas. The rodent species primarily targeted 

in surveys are the Norway rat (Rattus norvegicus), roof 

rat (Rattus rattus), and house mouse (Mus musculus).

Urban rodent surveys, as well as surveys for other pests, 

fulfill an essential surveillance requirement for every 

integrated pest management (IPM) program, which is 

the need for detailed information about conditions in 

a defined community. IPM is a long-term, effective, 

and holistic approach to managing pests of all kinds 

by carefully combining various interventions (e.g., 

education, code enforcement, rodent proofing, 

poisoning) in ways that minimize environmental 

hazards and deficiencies that affect people’s health.

The focus of this manual is on how to conduct a 

survey, although the other IPM components are 

covered briefly to establish their link to the survey. This 

manual is for classroom use and for the field training of 

program managers, environmental health practitioners, 

outreach workers, inspectors, and others who work in 

community-based rodent IPM programs. 

This manual is also a reference on survey techniques 

and on the preparation of reports and maps. 

IPM Basics

Definition and Philosophy

IPM requires a shift from the typical pest control 

efforts that often emphasize poisoning and trapping. 

With IPM, pests and disease vectors are managed 

by managing the environment. For IPM to succeed, 

the behavior and ecology of the target pest, the 

environment in which the pest is active, and the 

periodic changes that occur in the environment 

(including the people who share the environment) 

must be taken into account. In addition, the safety of 

the people, the environment, and the nontarget animals 

such as pets, birds, and livestock must be considered.

IPM is a decision-making process in which all 

interventions are focused on a pest problem and on 

the goal of providing the safest and most effective, 

economical, and sustained remedy. IPM is a 

comprehensive systems approach.

IPM is based on and should adhere to the sound 

biologic principles of population dynamics—the study 

of birth rates, mortality rates, and movement rates. An 

understanding of population dynamics is important 

because any successful strategy for the management 

of rodent populations depends on that understanding 

and on conducting appropriate interventions based on 

IPM principles. A 1976 CDC publication on urban rat 

control states that 

“political mechanisms must be able to administer 

the control procedures that are dictated by the 

principles [of population dynamics]. ...A corollary 

of the strategy of working with principles is that 

research should not continue in clear violation 

of population principles in expectation that a 

politically acceptable solution will be found.” 

Program and political support are essential in obtaining 

the necessary resources for an IPM program that takes 

into account the complex interplay of rodents, people, 

and environmental factors. The overall goals of IPM 

are to reduce or eliminate human encounters with pests 

and disease vectors and to reduce pesticide exposure.

Integrated Pest Management: Conducting Urban Rodent Surveys 1
Program Components

The four key components of an IPM program are 

survey, tolerance limit, intervention, and evaluation. 

If a key component is omitted, success in managing or 

eliminating pests is reduced. 

Surveys (inspection and monitoring): A measure 

of the magnitude of the pest problem and its 

environmental causes. Survey results determine the 

need for a rodent IPM program and the direction 

the program must take to manage the rodent 

problem. An urban rodent survey has four distinct 

phases: 

1.	 premises inspection (comprehensive or sample) 

of defined areas (e.g., groups of blocks) to record 

infestations and their causative conditions; 

2.	 preparation of maps, graphs, and tables 

to summarize survey results (may include 

photographs of field observations); 

3.	 preparation of a report that includes an 

analysis of block and premises data, and 

premises prevalence rates for infestation 

and its causative conditions; and 

4.	 recommendations to resolve the rodent 

infestation problem.
 

Surveys are especially useful in the development 

of educational interventions directed to the 

public (e.g., Web sites, television and radio 

programs, videos, newspaper articles, brochures, 

posters, exhibits). 

Tolerance limit (action threshold): The level 

at which a pest causes sufficient damage to 

warrant public health attention and intervention. 

Real or perceived damage can be aesthetic and 

can have economic, psychologic, and medical 

consequences. In 1972, CDC established 

tolerance limits for rodent infestation, exposed 

garbage, and improperly stored refuse. Details of 

these and other survey-based criteria are discussed 

later in this manual. The survey establishes 

the baseline on rodent infestation and on the 

causative conditions that support the infestation. 

The goal is to reduce both the infestation and the 

causative conditions to a level at which they no 

longer have an adverse effect on the community.

Interventions: Actions taken to prevent, 

reduce, or eliminate rodent infestations and 

their destructive effects. Survey data determine 

when, where, what, and whether interventions 

are necessary to prevent or eliminate a particular 

pest problem. Interventions are classified 

as educational, legal or regulatory, habitat 

modification, horticultural, biologic, mechanical, 

and chemical. These intervention categories 

typically form an IPM strategy. Most commensal 

rodent IPM programs emphasize educational 

and legal or regulatory interventions, and habitat 

modification. 

The key to a successful IPM program is the 

elimination of the causes of infestation (i.e., 

food, water, and harborage). The judicious and 

careful use of pesticides (including toxicants) to 

manage pests is also important for success. A vital 

IPM “rule” for selecting rodenticides or other 

pesticides is that the product chosen should be 

the least toxic product that will be effective on a 

target pest. The product also must have a highly 

efficacious and readily available antidote that 

can be administered in a timely manner for both 

humans and pets if a rodenticide is inadvertently 

ingested. Widespread and indiscriminate use 

of pesticides, a problem Rachel Carson warned 

about in her 1967 book Silent Spring, has serious 

consequences for people, animals, and the 

environment. 

Evaluation: The evaluation process (composed 

of periodic surveys) determines whether IPM 

interventions have been effective or whether 

they need to be repeated or modified. The 

initial survey of residential and commercial 

blocks and the periodic resurveys (monitoring) 

of a target community provides the basis for 

the evaluation of a program’s progress. 

Characteristics of Urban Rodent Surveys

A health-related government agency or department 

typically manages a community-based vector control 

program. For the purpose of this manual, such 

agencies or organizations will be referred to as the 

“IPM authority.” The responsible adult, whether 

a homeowner or a renter, who grants permission 

to inspect a premises or dwelling will be called the 

“householder.” 

Integrated Pest Management: Conducting Urban Rodent Surveys 2
The initial urban rodent survey is the data gathering 

phase of IPM program planning. Conducting the 

survey provides the IPM authority with an opportunity 

to inform residents about the program and to 

encourage their support when survey teams inspect 

their premises. An analysis of survey results will show 

the extent and severity of rodent infestations and their 

causative conditions and will delineate IPM program 

needs as well as the progress made in comparison with 

previous surveys. 

To determine the magnitude of the rodent problem, 

determine priorities, and evaluate progress, the IPM 

program must maintain a premises and block records 

management system. The system should provide 

for sequentially reporting survey findings using 

standardized reporting forms.

The urban rodent survey involves an exterior 

inspection of premises to record significant data such 

as active rodent signs, rodent entries to buildings, and 

environmental deficiencies that provide food, water, 

and harborage. Although the Norway rat and the roof 

rat generally live outdoors, they do enter buildings 

that are not rodent proofed. The house mouse can 

survive outdoors, but it prefers indoor areas in an 

urban habitat. Whenever rodents find suitable food, 

water, and harborage, they become established and 

reproduce rapidly. Interior inspections of dwellings 

and buildings may be required if signs of infestation 

are obvious. Gaining access to interiors of premises is, 

however, generally more difficult, and the problems 

associated with the management and control of interior 

infestations are greater. Nevertheless, interior inspection 

is considered an essential component of an IPM 

program if clear evidence exists of significant interior 

infestation.

Two forms are required for an exterior urban rodent 

survey: a field inspection form and a summary form 

for office tabulations (Appendix A, Figures 1–4; 

Figures 1 and 3 are blank forms and Figures 2 and 4 

are completed examples). These forms can be modified 

to serve the special needs of local programs. Although 

the use of check marks on a form may suffice to 

indicate the presence of deficiencies on premises, some 

programs use a coding system (e.g., letters, numbers, 

colors) to record more detailed information. Examples 

of such codes are furnished throughout this manual as 

an alternative to the checkmark system.

The survey forms provide the necessary data to 

plan and conduct a rodent IPM program. These 

data identify the need for rodent proofing, code 

enforcement, refuse management, cleanup of vacant 

lots, removal of abandoned automobiles and appliances, 

and other necessary interventions. The IPM approach 

emphasizes site-specific combinations of interventions 

to control or eliminate rodent populations.

In a more detailed version of the survey, a third form 

can be added for interior inspections. This form can be 

modified from the exterior inspection form to provide 

detailed data for each area or room within residential 

or commercial premises. This detailed information is 

useful in two ways: in determining where rodents may 

frequent and nest in particular areas of a premises or 

dwelling and in assessing rodent-related risks such as 

the potential for bites or food contamination. 

Basic Units in the Operational Program

For planning, operating, and reporting purposes, all 

rodent IPM programs use basic geographic units such 

as the following:

1.	 Premises (to record existing conditions). A 

premises is a plot of land with or without a 

building. It is the basic unit of a program in 

which survey items can be observed and recorded 

(e.g., environmental deficiencies, active rodent 

signs). Maintenance of a premises is usually the 

responsibility of a householder (unless multiple 

dwelling units are on a premises), superintendent, 

or manager who must maintain the 

environmental quality of the premises. For survey 

purposes, all premises are classified as residential, 

commercial, commercial and residential, or 

vacant lot. Schools, parks, churches, and parking 

areas are defined as commercial. 

A premises may consist of an individual residence 

and its surroundings—whether attached (e.g., 

row house) or detached (e.g., a stand-alone 

home). A duplex house or a large apartment 

building and its surroundings are considered a 

single premises because they are usually under 

one ownership and are situated on one plot of 

land. The same criteria apply to a commercial 

premises with a major building and other 

structures. For larger aggregations of buildings, 

such as several apartment buildings under one 

Integrated Pest Management: Conducting Urban Rodent Surveys 3
or several ownerships, each numbered building 

and its surroundings are considered to be a 

separate premises. Reviewing municipal tax 

parcel maps may be helpful to clarify the physical 

(e.g., property lines) and administrative (e.g., 

ownership) data related to a particular property. 

Where available, use of a geographic information 

system (GIS) to map properties can be helpful.

2.	 Block (to classify conditions). The block is a 

convenient unit for reporting infestations and 

causative conditions, recording interventions, 

and determining progress. In a target community, 

premises information should be aggregated for 

each block and filed according to assigned block 

numbers. A block is reported as infested as 

long as any active rodent signs exist on a single 

premises. 

A block is ordinarily bounded by four streets, 

but some blocks are bounded by three or fewer, 

or may be irregular in form. In some cases, 

imaginary boundaries conforming to prevailing 

block sizes may be set to define a block.

3.	 Census Tract (multiple contiguous blocks). The 

census tract is an excellent unit for large-scale 

planning and reporting purposes. Some IPM 

authorities use zones, wards, or elementary school 

or health districts for reporting purposes. 

4.	 Target Area (entire operational area of an IPM 

program). Large cities may have several target 

areas. 

Sample Versus Comprehensive Surveys

The block survey is considered comprehensive if 

all premises in all blocks in a defined target area are 

surveyed. In a sample survey, all premises on a block 

are inspected in a small but statistically valid number of 

blocks in a defined target area. Comprehensive surveys 

provide complete information on rodent infestation 

and sanitary conditions in a defined target area. Sample 

surveys are appropriate for defining an infestation 

problem and its causative conditions for a target area, 

but they are not appropriate for intervention purposes. 

The sample survey is quicker to do than a 

comprehensive survey because all premises are inspected 

only within a randomly selected sample of the blocks in 

the proposed or actual target area. This type of survey is 

typically used to determine the need for a rodent IPM 

program; to define program needs and requirements 

for personnel, material, and equipment; and to later 

evaluate program progress. 

Sample surveys are not intended for citywide 

application, although exceptions exist. Sample surveys 

are valuable for determining potential target areas. 

After a sample survey is completed, a comprehensive 

survey needs to be conducted. Potential target areas 

often are identified by number and location of rodent 

complaints, reported rodent bites, deteriorating 

housing conditions, and other related indicators 

including causative conditions of infestation. 

A comprehensive survey requires significantly more 

personnel than a sample survey, but it has considerably 

greater impact on the community because all premises 

in the target area are inspected. Comprehensive 

surveys should be conducted concurrently with 

public education, community outreach, code 

enforcement, neighborhood cleanup campaigns, and 

other IPM activities. Two comprehensive surveys are 

recommended per target area per year. More frequent 

surveys are desirable, but resource considerations can be 

a limiting factor.

Personnel Requirements

Ideally, urban rodent surveys should be conducted 

by two-person teams, with the most qualified person 

recording the data and making decisions about 

questionable findings. Safety is also a factor in a team 

approach.

Survey teams, where possible, should be composed of 

experienced rodent control specialists, environmental 

health specialists, or other trained personnel. 

Knowledge of the area to be surveyed, when practical, 

can also be helpful, especially if a member of the survey 

team lives in the area to be surveyed. The survey teams 

should be guided by the exterior inspection form, 

which is to be completed during the inspection.

At least 3 to 5 days of classroom and field training 

are recommended for inspectors to ensure that their 

observational and recordkeeping skills are satisfactory. 

To conduct interior inspections, additional classroom 

and field training is necessary. 

Integrated Pest Management: Conducting Urban Rodent Surveys 4
IPM surveys are a detail-dependent process. The 

number of premises inspected per team per day 

will vary with experience, complexity of the built 

environment, and other variables. For example, large 

lots, multiple dwellings on a premises, difficult-toaccess alleys, and complex building designs need to be 

considered in determining the time required to conduct 

a survey. 

In most communities, permission for entry onto 

premises must be obtained before conducting an 

inspection. People may resent the intrusion onto 

their properties unless they understand and accept 

the purpose of the inspections. Community support 

should be sought to enhance program success. This 

support can be gained by meeting with community 

representatives, church groups, and others in advance 

of the survey.

Survey Procedures

Conducting an urban rodent survey involves four 

phases: preparation, public information and education, 

inspection, and analysis.

1.	 Preparation. Planning the operation and 

recruiting and training staff. Provision should be 

made to secure official photo identification cards 

and distinctive uniforms to identify field staff. 

Vehicles that are clearly marked with the IPM or 

department logo will enhance the community’s 

perception of the program. Vehicles are used to 

transport inspection staff, materials, and supplies 

for intervention purposes.

2.	 Public Information and Education. Using 

communication materials to promote the IPM 

program. Agencies or department officials 

should use news media, Web sites, exhibits, 

and brochures and posters as well as visit the 

target area to inform residents in advance of 

the survey and explain its importance. There 

should be outreach to community organizations, 

parent-teacher associations, churches, building 

manager associations, trade unions, and other 

groups to gain support for the program. Contact 

should also be established with local official 

agencies (e.g., housing, sanitation, sewer, 

utilities) and others who may have interest in 

or responsibilities associated with the program. 

These contacts can be invaluable in the planning 

and implementation process. In addition, 

accommodation for residents who work during 

the day needs to be built into the program’s work 

schedule. This accommodation may sometimes 

require that those working in public education 

and outreach activities will have to work in the 

early evenings or on weekends. 

3.	 Inspection. Inspecting premises for active rodent 

signs (e.g., droppings, rub marks, open burrows) 

and causative conditions (e.g., improper refuse 

storage, pet food) in target areas and recording 

data on the exterior inspection form (Appendix A, 

Figure 1). Evaluation is an essential component 

of the survey process. Taking photographs can 

be helpful in understanding particular infestation 

problems and can be used for training purposes 

is part of the evaluation process. Although 

inspections are generally conducted during 

daylight hours, we recommend that senior staff 

occasionally visit the target area at night to view 

conditions during the rodents’ active period. 

These night inspections will add clarity to the 

relation between the rodents and their built 

environment. They will also provide a better 

understanding of the impact of poor refuse 

management. Infrared video cameras can be used 

to document rodent activity at night.

4.	 Analysis. Tabulating findings, analyzing data, 

and comparing achievements. Analysis of data 

provides the basis for developing work plans and 

for preparing reports with recommendations 

for eliminating infestations. Such reports often 

are supplemented by tables, graphs, maps, and 

photographs.

Sample Survey Methodology

Initiating a sample survey requires maps, survey forms, 

and complete lists of blocks or premises of the target 

area. Each premises must be clearly defined and given 

a number so that it can be unambiguously identified 

on the map. Because of expected variations in block 

configurations, decide what constitutes a block for 

survey purposes. All field personnel must be aware of 

that definition.

Integrated Pest Management: Conducting Urban Rodent Surveys 5
 

 

 

The procedure for selecting the sample number of 

blocks for a random block survey follows:

1.	 Determine as closely as possible the number of 

blocks and premises within the target area or 

areas to be surveyed.

2.	 Determine the number of premises that will 

have to be inspected to ensure statistical validity 

(Table 1). Note: Sample sizes must adhere to the 

minimum standards; the reliability of the survey 

results depends on adherence to the standards.

3.	 Divide the number of blocks in a target area into 

the estimated number of premises. The equation 

below represents the average number of premises 

per block in the target area.

20,000 premises

Example: ––––––––––––– = 20 premises per block

 1,000 blocks 

4.	 Determine the number of blocks so that a 

sufficient number of premises (as obtained from 

Table 1) will be surveyed.

Example: If at least 500 premises need to be inspected, 

and the target area contains an average of 25 premises 

per block, then all premises on 20 blocks will need to 

be surveyed.

 500 premises needed 

———————————— = 20 blocks

 25 (average premises per block)
 

5.	 Select the 20 blocks by using a table of random 

numbers (Appendix B, Table B-1), with each 

number representing a specific numbered block. 

Note: When using this method, every premises on a 

selected block should be inspected, even if repeat visits 

are required. 

Another survey method is to randomly select a sample 

of premises in the target area for inspection. For this 

method, a complete list of premises is needed, but 

such a list can be difficult to obtain. This particular 

method requires assigning every premises a number and 

identifying each premises on a map. 

Survey Crews and Equipment

Two-person teams are more efficient to conduct block 

surveys. Each team should carry the following items: 

•	 a supply of field forms (exterior, interior, or 

both, depending on the needs of the program), 

•	 mechanical lead pencils and lead refills (0.5-

millimeter leads, HB type), 

•	 clipboards, 

•	 flashlights (rechargeable type is recommended), 

•	 gloves, 

•	 forceps, 

•	 hand lenses (5–10X), 

•	 small plastic vials and zip-close plastic bags for 

field samples (e.g., dead rodent specimens, fecal 

droppings), 

•	 black light to detect rodent urine stains, 

•	 dog repellent, 

•	 digital still cameras, and 

•	 mobile phones or pagers (for communication 

between supervisors and inspection teams and 

for emergency situations). 

Table 1. Minimum Number of Premises Inspected to Ensure Statistical Validity*

Number of Premises in Target Area Minimum Number of Premises to Inspect

10,000 or more 500

3,000–9,999 450

Up to 2,999 435

*Center for Disease Control. Urban rat surveys. Atlanta: US Department of Health and Human Services; 1974.

Integrated Pest Management: Conducting Urban Rodent Surveys 6
Note that a personal digital assistant (PDA) can be used 

instead of the field forms, lead pencils, and clipboards. 

Also note that infrared video cameras can be a valuable 

tool for filming rodents at night. 

For indoor inspections, add the following items: 

•	 small and large flashlights (headlamps, if 

practical), 

•	 extendable inspection mirrors, 

•	 dust masks or respirators, 

•	 hard hats, 

•	 portable vacuum cleaners with high-efficiency 

particulate air (HEPA) filters, and 

•	 small ladders (4 feet [1.2 meters]).

If a recording code (instead of a check mark) is to be 

used on the forms for more precise information about 

specific data categories, a copy of the codes should 

be taped to the clipboard for easy reference. The 

inspection forms can be relatively simple or can be 

greatly detailed depending on the needs of the survey. 

Inspection forms can be completed using PDAs and 

other portable computer equipment. 

Each team should have a supply of outreach literature 

on the program to distribute to landlords and 

householders during the surveys. 

Premises Inspection—Exterior

Supervisors should hand out the block assignments 

before the teams leave the office. For multiple teams, 

the supervisor should remain in the immediate area to 

monitor the work of the teams and to provide support 

as needed. 

A standardized survey process is more effective; 

for example, begin the survey of each block at the 

northeast corner and move clockwise. From this corner, 

the inspectors proceed around the block, inspecting 

each premises in the order established for the survey. 

The two-member teams may work together on an 

inspection, or, if both are experienced, they may 

inspect alternate primeses and be available to assist 

each other as needed. Placing a chalk mark on the curb 

after a primeses has been inspected can be useful if a 

supervisor needs to locate the team; however, inspectors 

may use portable phones to maintain contact. 

Each premises should be approached from its main 

entrance area and should not be entered by crossing 

yards. The inspector should request permission from 

a responsible adult to conduct an inspection. A 

brochure that explains the program can supplement 

the explanation of the program and the purpose of the 

inspection. Usually, only a few minutes are required to 

communicate effectively with householders. Occupants 

of the premises should be encouraged to join in the 

survey of the premises. This participation allows 

inspectors an opportunity to praise occupants for the 

well-maintained aspects of the primeses, such as a clean 

yard, and to tactfully call attention to active rodent 

signs or sanitation deficiencies.

Inspectors should wear clear identification that 

identifies them as a representative of the rodent IPM 

program. Wearing distinctive official uniforms also can 

be helpful in establishing identity with the program.

Before proceeding with the exterior inspection of 

a premises, write the number of dwelling units on 

the exterior inspection form (Appendix A, Figure 1, 

column 7. See the Instructions for Completing the 

Block Record (Exterior Inspection) Form section 

on pages FILL). The team should then proceed in a 

clockwise direction around the premises, inspecting 

the buildings, yard, and passageway(s) or other spaces, 

and recording all deficiencies on the survey form. The 

inspection pattern is as follows: 

•	 front (the facade or surface of the building that 

contains the main entrance and its associated 

yard or other spaces), 

•	 left side (left wall surface of building and its 

associated yard or other spaces), 

•	 back or rear (the rear wall surface of the building 

and its associated yard or other spaces), and 

•	 right side (the right wall surface of the building 

and its associated yard or other spaces). 

Symbols can be used instead of check marks to record 

information. These symbols can also be used as a 

reference in the Remarks section or in the premises 

Integrated Pest Management: Conducting Urban Rodent Surveys 7
Address column of the form; for example, F: front 

(with main entrance to building), L: left side, B: back 

or rear, and R: right side.

Rodent signs should be observed at close range to 

determine infestation. Inspectors should look for 

active rodent runs or burrows in the yard, entry 

routes into buildings, burrows under walls or in ditch 

banks, rodent damage, fresh fecal droppings along 

foundations, and other evidence of infestation.

Before leaving a premises, inspectors should check the 

inspection form to make certain that all items have 

been completed. Having a supervisor or another field 

inspector recheck the survey findings on a subsequent 

day to verify results can be helpful (e.g., taking a 10% 

sample of the surveyed premises to ensure the recorded 

information is accurate and complete). 

In some instances, householders may refuse permission 

for IPM staff to inspect their premises or dwelling. 

These refusals should be noted on the report form 

and referred to the supervisor. In other instances, no 

responsible adult may be at home to grant permission 

for inspection. In such cases, the policy of the IPM 

authority determines whether to conduct the exterior 

inspection.

Premises Inspection—Interior

The term “interior inspection” generally applies to 

the main buildings on a premises and not to sheds or 

outbuildings (this delineation can be modified to meet 

the needs of the local IPM authority). Two-person 

teams are recommended for interior inspections. The 

work is detail-oriented, tedious, and often difficult to 

accomplish because of clutter, furniture, and crowded 

conditions. 

Inspectors should check all rooms in the building for 

rodent signs and sanitation deficiencies. Kitchens, 

closets, bathrooms, attics, and basements are especially 

attractive to commensal rodents. All floor levels of the 

building should be inspected regardless of the suspected 

species. Norway rats are usually found in basements 

and on lower floors; upper floors and attic areas are 

especially attractive to roof rats; and house mice can be 

found nearly anywhere, including in cabinet drawers 

and above drop ceilings. Householders often can be 

helpful in providing specific information on a rodent 

infestation.

In some communities, the interior rodent population 

may be more difficult to manage or control than the 

exterior population. The exterior inspection form 

(Appendix A, Figure 1) can be modified for interior 

inspections. When doing so, information such as level/

floor, room type, and number of occupants as well as 

information on active rodent signs (droppings, holes, 

gnawed materials, and rub marks) should be included 

on the modified form. Information about rodent bites 

should also be collected.

Infestation rates (i.e., percent of apartments in a 

building with active rodent signs) are useful in 

comparing conditions or measuring IPM progress over 

time. 

Inspection teams should follow standardized procedures 

for interior inspections. For example, in a multifamily 

apartment building, start in the basement, then work 

upward, inspecting apartments in numerical order, then 

inspect the attic or crawlspace, and finally the roof (if 

accessible). Enter each apartment through the front 

(main) door and inspect the wall that contains the main 

door as well as everything on or touching that wall for 

signs of rodents and potential rodent entries. Move 

clockwise to the next wall and continue until all walls 

are inspected. Next, inspect the floor area, including 

anything on or touching the floor. Last, inspect the 

ceiling area, including anything on or touching the 

ceiling. Each room should be inspected in the same 

manner. Closets should be inspected in association with 

particular walls of a room.

This standardized inspection method provides very 

specific data on rodent locations for intervention 

purposes. The data also simplify the tracking of specific 

changes over time and provide information for other 

inspectors. 

Instructions for Completing the Block 

Record (Exterior Inspection) Form

The Block Record—Exterior Rodent Inspection 

and Sanitation Form (Appendix A, Figure 1) is used 

to record information on rodent infestation and 

environmental deficiencies for each premises on a 

block. The form has space for recording information 

for 10 premises; additional forms can be used as 

necessary. Enter the page number in the space provided 

at the top right corner of the form (i.e., “1 of 2,” “2 of 

2”). If only one form is required for a block, use the 

Integrated Pest Management: Conducting Urban Rodent Surveys 8
same notation (i.e., “1 of 1”) to clarify that only one 

page is required. In addition, enter the names of the 

inspectors at the top of the form in the space provided. 

Other items at the top of the form should be completed 

by the supervisor or team leader before the teams enter 

entering the field. The location of a block should be 

indicated by writing the names of the streets that form 

the block in the block diagram space in the upper left 

portion of the form. 

A copy of the assignment chart should be kept in the 

inspector’s or supervisor’s office. 

Completed inspection forms (Appendix A, Figure 2) 

should be checked and initialed by the inspectors. 

All columns of block data should be totaled and 

recorded on the appropriate line of the summary form 

(Appendix A, Figure 4 is a completed example). The 

summary form should be used to prepare progress 

reports, identify problems, and target resources. 

Premises Address

•	 As inspectors proceed clockwise around a 

block, they should write each street address in 

the left column. If an indoor inspection has 

been conducted at a particular address, the line 

number (1 to 10) in the “No.” column should 

be circled. 

Premises Type 

A premises must be classified in one of four categories 

(columns 1–4): residential, commercial and residential, 

commercial, or vacant lot. Only one of the first four 

columns should be checked. 

Column 1: Residential 

Put a check in this column if the unit is a home 

or dwelling (defined as an enclosed space used for 

living purposes). A dwelling can be a single-family or 

multifamily unit. Enter the number of dwelling units 

in column 7 (No. of Dwelling Units).

Column 2: Commercial and Residential 

Put a check in this column if a premises is used for 

both commercial (see column 3 description) and 

residential purposes.

Column 3: Commercial 

Put a check in this column if the premises is used only 

for commercial purposes (including parking lots) or for 

other nonresidential purposes such as offices, churches, 

clubhouses, or schools. The type of premises (e.g., 

school) may also be written in the address column. 

Some IPM programs may decide to use a code for 

recording public properties, clubs, churches, or other 

types of nonresidential properties.

Column 4: Vacant Lot 

Put a check in this column for a lot with no structure 

on it. Note that a parking lot should be designated as 

“commercial.”

Premises Details

Use these four columns of the inspection form to 

record information that may be helpful in estimating 

population density and in determining resource needs 

for intervention purposes. 

Column 5: Food-Commercial

Put a check in this column if a regular, primary 

function of the premises is to prepare, sell, serve or 

dispense, or store food materials, including animal 

foods. Thus, restaurants, delicatessens, soup kitchens, 

bakeries, grocery stores, nursing homes and hospitals 

(where daily meals are served), pet stores, and grain 

warehouses should be included here. Both this column 

and column 2 or 3 should be checked.

Column 6: Vacant

Put a check in this column if the main building on 

the premises is not in use, whether temporarily vacant, 

permanently abandoned, or boarded up and scheduled 

for demolition. Abandoned buildings generally are 

not considered habitable because of deterioration 

(e.g., broken windows, missing doors, vandalism, fire 

damage). If more precise information is desired, three 

symbols can be used in this column instead of a check 

mark: V: vacant and habitable, AO: abandoned and 

open, and AS: abandoned and sealed.

Column 7: No. of Dwelling Units 

Enter the number of dwelling units here. Determining 

the number of dwelling units on a premises should be 

based on the following definition: 

Integrated Pest Management: Conducting Urban Rodent Surveys 9
A dwelling unit is a room or group of rooms 

located within a building or structure that 

forms a single habitable unit to be used for 

living, sleeping, cooking, and eating. 

Multiple dwelling units (e.g., apartments) can exist 

on a premises. The number of mailboxes, meters, or 

doorbells is an indicator of the number of dwelling 

units on a premises. Only the number of habitable 

dwelling units on a premises should be marked; noninhabitable dwelling units should not be marked.

Column 8: Sewers on Premises

Put a check in this column to record the presence of 

a sewer pipes or storm water drains on the premises. 

Sewers can provide harborage, and rats often travel 

between a premises sewer and the exterior portions of 

the premises. Evidence of harborage includes active 

burrows near manholes, catch basins, or broken sewer 

pipes, and fresh rub marks on broken downspouts 

that empty into sewers. If other sewer deficiencies are 

found, do not check them; use an asterisk and include a 

footnote under the Remarks section of the form. 

Food

These columns (numbers 9–12) provide information 

on food sources that must be eliminated. 

Proper storage of refuse (also called municipal 

solid waste or MSW) requires the use of rodentproof containers of adequate construction, size, and 

number. Refuse is defined as a mixture of garbage 

and rubbish. Garbage consists largely of human food 

waste (organic, putrescible), but it includes offal, 

carrion, and animal feces (e.g., dog or horse). Rubbish 

is considered nonfood solid wastes (combustible and 

noncombustible, nonputrescible) such as metal, glass, 

furniture, carpeting, paper, and cardboard. Rubbish 

also includes wood chips and yard wastes. 

In conducting rodent surveys, the following criteria for 

refuse storage are recommended.

Approved Refuse Storage

•	 Refuse containers should be water tight 

with tight fitting lids that may be hinged; 

rust resistant; structurally strong; and easily 

filled, emptied, and cleaned. Standard refuse 

containers are 20–32 gallons (91–150 liters). 

Hinged containers with wheels can hold up to 

95 gallons (430 liters). Bulk containers such 

as dumpsters have side handles or bail for 

manual handling or special attachment hooks 

and devices for automatic or semiautomatic 

handling.

•	 Bulk storage containers are generally acceptable 

and are often used in multihousing buildings, 

commercial establishments, and construction 

sites. Such containers often have a drain hole 

to facilitate cleaning. These drain holes are 

often 2–3 inches (5–8 centimeters) in diameter 

and are fitted with a removable hardware cloth 

screen or screw-on plug to prevent entry by 

rodents. 

•	 Galvanized metal or heavy, high-grade plastic 

containers meet the guidelines under a in the 

Column 10 section. 

•	 Cardboard boxes used for yard trash (essentially 

nonfood items) are acceptable.

•	 Plastic or moisture resistant paper bags used for 

refuse, properly tied and intact, placed at the 

curb or alley only on collection day and only 

during daylight hours are acceptable.

Plastic Bags

Plastic refuse bags are widely used as liners in standard 

20–32 gallon (91–150 liters) and larger refuse 

containers. These bags are required by many building 

managers for refuse placed in bulk containers and are 

used by many residents for yard trash. 

To judge whether plastic bags are managed properly:

•	 Know the scheduled refuse collection days in the 

block being surveyed.

•	 Observe whether the storage site contains both 

acceptable bags and refuse containers or whether 

plastic bags appear to be the sole containers for 

storing refuse.

Plastic bags are not considered appropriate for 

overnight storage outdoors because nocturnally active 

rodents and other animals (e.g., cats, dogs) can easily 

Integrated Pest Management: Conducting Urban Rodent Surveys 10
gain access to their contents. Plastic bags should be 

considered acceptable only when placed outside during 

daylight hours for collection the same day. 

Approved Recyclable Storage

•	 Outdoor containers for recyclable items (paper, 

cardboard, plastic, glass, or metal cans) should 

be water-tight, strong enough to support 

the weight of items contained, and easy for 

sanitation crews to handle.

•	 Containers similar to those for refuse storage are 

generally acceptable for household recyclables, 

as are large plastic bags properly tied and intact 

and placed at the curb or alley only during 

daylight hours on collection day. 

•	 In all cases, items stored should be free of food 

particles or other food residue.

To judge whether recyclables are managed properly:

•	 Know the scheduled recyclable collection days 

for the block being surveyed.

•	 Observe whether the recyclable items have 

been cleaned or rinsed or are otherwise free of 

food residue and that the plastic bags or other 

containers holding the recyclables are intact.

Column 9: Unapproved Refuse Storage

Put a check in this column if garbage, rubbish, other 

refuse, or recyclable items are not stored in approved 

containers with tight fitting lids (or are not in tightly 

tied bags—where acceptable—during daytime only). 

Approved containers should be of the design described 

in the Approved Refuse Storage section. When 

properly placed in plastic or paper bags, securely tied, 

and regularly collected, yard trash and other inedible 

materials are approved. Yard trash is acceptable when 

placed in cardboard boxes or paper bags and regularly 

collected.

Put a check in this column if any of the following 

conditions are observed:

• Container that is not rodent and fly tight.

• Screw-on plug or rodent-excluding screen of 

an otherwise approved bulk container is not in 

place or is missing. 

•	 55 gallon (250-liter) drum. Such containers 

are often observed without a tight-fitting cover. 

When filled, they are too heavy and bulky to 

handle.

•	 Nonstandard metal or cardboard containers that 

are not being used for regularly collected yard 

trash.

•	 Bin or stationary receptacle for refuse storage.

•	 Receptacle too small or too few receptacles for 

the amount of refuse.

•	 Overflowing receptacle or one with the cover 

off.

•	 Container(s) on a platform on the ground 

or with a shallow space (<18 inches [46 

centimeters] high) that offers harborage for 

rodents and possibly hides scraps of food spilled 

from the container.

•	 Burned refuse.

•	 Scattered refuse (including garbage, rubbish, or 

recyclables).

More-precise information can be obtained by using 

symbols instead of check marks to record specific 

deficiencies. 

Column 10: Exposed Garbage

Put a check in this column if observed refuse storage 

practices make garbage available to rodents. In many 

cases, a premises may be noted for Unapproved Refuse 

Storage, but no garbage available to rodents is observed. 

Exposed garbage should be noted on the basis of the 

following:

a.	 Garbage container is not rodent tight (the 

space between the container and lid is greater 

than 1⁄4 inch [0.64 centimeters], and the 

container is used for garbage storage).
 

b.	 Garbage in an open container 

is available to rodents.
 

Integrated Pest Management: Conducting Urban Rodent Surveys 11
c.	 Garbage is scattered on the ground. Plastic bags 

containing garbage are ripped, present after 

dark, not properly tied, or have obviously not 

been collected for longer than 1 day. Clean 

beer cans, soft-drink bottles, and old food 

cans and jars are not considered a rodent food 

source. Note: Vegetable and fruit plants are 

recorded under Other Food and Plants, 

not as Exposed Garbage. Any premises 

marked for Exposed Garbage should also be 

marked for Unapproved Refuse Storage.

Column 11: Animal Food

Put a check here if uneaten animal food (e.g., food for 

pets such as dogs or cats, birds, or livestock) is exposed 

outdoors or if it is exposed in an outbuilding accessible 

to rodents. Exposed pet food, other than for immediate 

feeding, should be recorded. In the case of birdfeeders, 

check only if uneaten birdseed is observed on the 

ground and is readily available to rodents. However, 

some commensal rodents are excellent climbers, so 

caution should be exercised in assessing birdfeeders. 

Animal food should not be recorded as exposed 

garbage. 

Column 12: Other Food and Plants

Put a check in this column if vegetables, fruit and nut 

trees, or ornamental shrubs and vines with fruits and 

berries are accessible to rodents. Put a check in this 

column if exposed food items in the dwelling’s interior 

are observed but are not easily classified in the other 

four columns. Items for this column include soiled 

dishes exposed overnight, food waste on the stove or in 

the oven, and solid or liquid foods on the floor. 

Water

Although commensal rodent dependency on water 

varies with diet and species, water sources should be 

eliminated. High-protein diets increase a rodent’s need 

for water, but house mice are capable of living with 

little water. All three species (Norway rat, roof rat, and 

house mouse), however, are attracted to water when it 

is available. Natural bodies of water, such as streams, 

lakes, and ponds, are excluded from the survey. The 

three survey categories in the Water section (columns 

13–15) are observable water resources that need to 

be managed as part of IPM habitat modification 

interventions. Only one of the three columns should be 

checked for water available to rodents.

Water and moisture reduction can also enhance IPM 

practices to control mosquitoes, cockroaches, and mold 

(especially indoors). 

Column 13: Standing Water

Put a check in this column if water accumulations that 

are accessible to rodents are found in containers such 

as buckets, pans, discarded tires, water bowls for pets, 

window pits of basements, and clogged rain gutters. 

For indoor inspections, check for water and other 

consumable liquids that are available overnight in open 

containers on tables or desks or in sinks, cooking pans, 

and buckets.

Column 14: Condensate

Put a check in this column if condensate is available 

to rodents in, for example, collection pans under 

refrigeration or air conditioning units; from dripping 

or running water from a pipe onto the ground or 

pavement (or onto a basement floor indoors); or 

directly from the surface of, or dripping from, cold 

water pipes indoors.

Column 15: Leaks

Put a check in this column if water is regularly leaking 

from, for example, a roof, pipe, or outdoor faucet onto 

the ground, pavement, or floor (indoors). For observed 

leaks, do not check the Standing Water category even if 

water has accumulated.

Harborage

The seven survey items in this section (columns 16–22) 

pertain to the providing of harborage for rodents. Put 

a check in any column only if the inspector judges that 

a significant rodent harborage condition is evident. 

For some surveys, quantifying the harborage present is 

helpful (e.g., using figures to indicate the number of 

abandoned vehicles and appliances or to estimate the 

number of cubic yards or cubic meters of large piles 

of rubbish, lumber, or clutter that is on the ground 

or on the floor indoors. These figures can be useful 

in estimating the resources needed for cleanup and 

for measuring progress in reducing the amount of 

harborage present.

Integrated Pest Management: Conducting Urban Rodent Surveys 12
Column 16: Abandoned Vehicles

Put a check in this column if abandoned vehicles are 

in the yard, street, or alley. A vehicle is considered 

abandoned if the license tag is not current, if major 

parts are missing, or if high grass and weeds are 

growing around it. Abandoned vehicles observed in 

rodent-accessible garages should also be recorded. The 

summary line at the bottom of the form should note 

the number of premises with abandoned vehicles. 

The total number of vehicles may be entered directly 

below the column total if vehicles are counted for each 

premises.

Column 17: Abandoned Appliances

Put a check in this column if appliances (such as 

refrigerators, stoves, or washing machines) are stored in 

the yard, in a dilapidated outbuilding, or at the edge of 

an adjoining street or alley. Put only one check mark 

regardless of the number of items observed; however, 

the number of appliances may be entered in the 

column instead of a check mark. The survey summary 

line should show the number of premises with 

abandoned appliances, not the number of appliances. 

The total number of appliances may be entered directly 

below the column total if appliances are counted for 

each premises. 

Column 18: Lumber or Clutter on the Ground

Put a check in this column if a significant amount 

(covering at least 1 square yard or 1 square meter) of 

lumber, firewood, or clutter is on the ground. These 

materials provide harborage for rodents. Clutter, 

either outdoors or indoors, is defined as disorganized 

storage of usable materials (not rubbish) that is not 

being used and which impedes inspections for active 

rodent infestation. A few scattered pieces of lumber 

or other materials should not be recorded, nor should 

lumber left on the ground as a result of recent building 

construction or demolition and is subject to early 

removal. If the amount is to be quantified, estimate the 

number of cubic yards (or cubic meters) to the nearest 

whole number. The number recorded in the Total row 

at the bottom of the column, however, is always the 

total number of premises with a deficiency. The total 

number of cubic yards (or cubic meters) of lumber or 

clutter may be entered directly below the column total 

for premises. 

Column 19: Other Large Rubbish

In both exterior and interior inspections, put a check in 

this column if there are discarded items of rubbish that 

are too large or otherwise not suitable for storage in 

approved refuse containers. These items include tires, 

automobile engines, large cans and drums, tree limbs, 

rubble, doors, mattresses, furniture, and other large 

items not listed in other columns. If the amount is to 

be quantified, estimate the number of cubic yards (or 

cubic meters) to the nearest whole number and enter 

the number directly below the column total.

Column 20: Outbuildings or Privies

Put a check in this column only if the buildings on 

the premises are dilapidated or otherwise provide 

significant rodent harborage. A tight, well maintained 

building or an open, clean shed should not be recorded. 

Appliances, lumber, clutter, or large rubbish in an open 

shed should be reported in their respective columns 

if they furnish harborage. Always check this column 

when privies or outhouses are found. 

Column 21: Board Fences and Walls

Put a check in this column if dilapidated board 

fences, walls, or concrete slabs (e.g., patio slabs, 

broken sidewalks) are found because they can provide 

harborage for rodents.

Column 22: Plant-Related

Put a check in this column if weeds or grass are more 

than 12 inches (0.3 meters) high and are sufficiently 

thick to hide refuse and provide harborage for rodents. 

Bushes and overgrown shrubbery that provide rodent 

harborage are also deficiencies that should be recorded. 

Note that roof rats are climbers and prefer to nest in 

trees, bushes, and attics of dwellings and outbuildings. 

Put a check mark in this column if dense growth such 

as ivy, honeysuckle, pyracantha, ground cover, dense 

shrubbery or vines, or palm trees provide harborage 

for rodents. Large planters indoors or outdoors may 

provide harborage for rodents, either in the soil or 

among dense vegetation. If more precise information is 

desired, symbols identifying types of dense growth may 

be used to record such deficiencies.

Integrated Pest Management: Conducting Urban Rodent Surveys 13
 

Entry and Access

The two columns in this section (columns 23–24) are 

for recording the need for rodent-stoppage work to 

prevent rodents from entering structures. 

A Norway rat can gain access to a structure through a 

hole the diameter of a U.S. quarter (0.96 inches or 

24.3 millimeters in diameter) and a mouse can gain 

access through a hole the diameter of a U.S. dime 

(0.71 inches or 17.9 millimeters in diameter). 

Structural openings should be less than 3⁄4-inch (<19 

millimeters) in diameter to exclude adult Norway 

rats, less than 1⁄2-inch (<13 millimeters) in diameter 

to exclude adult roof rats, and less than 1⁄4-in (<6 

millimeters) in diameter to exclude adult mice. If 

openings are sealed (totally closed), cockroaches and 

other insects will also be excluded.

From a running start, a house mouse can jump up to 

2 feet (0.6 meters) high, a Norway rat up to 3 feet (0.9 

meters) high, and a roof rat up to 4 feet (1.2 meters) 

high. Therefore, openings up to 5 feet (1.5 meters) 

from the ground must be sealed or covered with mesh. 

Column 23: Structural Deficiencies

Put a check in this column if an actual or potential 

rodent entry to a building because of deterioration or 

structural defects is observed. Common defects include 

holes in crumbling masonry foundations, deteriorated 

fascia boards at the edge of roofs, and poorly fitted 

doors with gaps of sufficient size to permit rodent 

entry.

Column 24: Pipe and Wiring Gaps

Check this column to indicate that a gap or hole 

associated with a wire, pipe, or other conduit penetrates 

the building exterior (including basement floor or roof) 

and is sufficiently large to permit rodent entry. For 

indoor inspections, check this column if openings in 

interior walls, floors, or ceilings are found.

Active Signs

Put a check in column 25 if active or fresh rodent signs 

are observed during exterior or interior inspections. 

A premises is considered infested with rodents only 

if active signs are found (e.g., sightings, droppings, 

runways, rub marks, burrows or openings, gnaw marks, 

tracks). The infestation rate is calculated on the basis of 

the number of premises on a block with active rodent 

signs divided by the total number of premises on a 

block times 100.

If additional details are desired, symbols could be 

placed in or next to the column to distinguish signs 

attributable to Norway rats, roof rats, or house mice. 

Active rodent signs usually will be one or more of the 

signs listed below. More precise information can be 

recorded by using the following symbols instead of 

check marks: 

B. Burrows: active burrow entrances do not have 

cobwebs or other blockages.
 

D. Fecal droppings or urine: fresh feces are dark and 

soft; old feces are hard or gray and brittle; urine 

may be wet, glossy, or sticky or may be a dried 

stain. A black light can help show rodent urine 

stains. 

H. Gnawed holes, gnaw marks, or tooth marks: a 

freshly gnawed surface is usually light in color.

M. Rub marks: if fresh, they are black, soft, and 

greasy.
 

R. Runs: well traveled paths (Note: runs usually lead 

to food sources, water, and harborage).

T.	 Tracks: fresh foot tracks or tail-drag marks.

Z. Rodent hairs: often found on rub marks or at 

entry holes to buildings.
 

Remarks

This section at the bottom of the form is for additional 

information.

Interior Inspection Using a Modified 

Block Record (Exterior Inspection) Form 

Much of the methodology for completing an interior 

inspection is the same or similar to that for an exterior 

inspection. A modified interior inspection form focuses 

exclusively on deficiencies found indoors. An interior 

form should include space for the premises address 

and the number of dwelling units at that address. The 

form’s design should depend on the needs of the local 

Integrated Pest Management: Conducting Urban Rodent Surveys 14
IPM program, but suggested categories are listed in this 

section. Many of these categories are explained in the 

Instructions for Completing the Block Record (Exterior 

Inspection) Form; categories not explained in that 

section are explained below.

Premises Type 

•	 residential,

•	 commercial and residential, and 

•	 commercial.

Premises Details 

•	 level or floor (where unit is located), 

•	 room type (e.g., bedroom, bathroom, hallway, 

kitchen),

•	 number of occupants in unit, and 

•	 sewer pipes or storm water drains on premises.

Food

•	 unapproved refuse storage,

•	 exposed garbage,

•	 animal food,

•	 unapproved food storage (food material stored 

in open or unprotected boxes, bags, bins, 

or other containers or stored under storage 

conditions that are not rodent proof [e.g., cereal 

cartons]), and 

•	 other food and plants. 

Water 

•	 standing water,

•	 condensate, and

•	 plumbing leaks.

Harborage 

•	 clutter or storage on the floor, 

•	 other large rubbish, 

•	 plant-related, and 

•	 other harborage (small accumulations of 

material that may be viewed as providing 

harborage [e.g., piles of clothes on the floor]).

Entry and Access 

•	 structural deficiencies and

•	 pipe and wiring gaps

Active Signs

•	 fecal droppings, urine;

•	 holes, gnawings, burrows;

•	 tracks, runs, rub marks; and 

•	 rodent bites reported (This item is to capture 

information on whether the occupant has 

reported being bitten by a rodent within 

the 6-month period before the inspection. 

Information should be collected about the 

demographics of the victim, the biting incident, 

and the action taken by the health authority. 

Information about the rodent infestation, bites, 

circumstances, unsanitary conditions, food and 

water access, and harborage will be valuable in 

the effort to eliminate the infestation.

Note: Having the inspection team carry a small 

portable HEPA-filtering vacuum cleaner to remove 

rodent signs (e.g., droppings and nesting material) 

may be beneficial. The vacuum cleaner can also be 

used to remove potentially allergenic material from the 

dwelling. 

Remarks 

The modified interior inspection form should also 

include a Remarks section to record additional 

information (e.g., heavy rat infestation in an apartment 

with very young children) that requires immediate 

attention or referral to another department. 

Integrated Pest Management: Conducting Urban Rodent Surveys 15
GIS and Mapping

GIS is a highly valued tool, as are maps of the target 

area or community. Maps help define the infestation 

problem and its causes as well as measure progress 

toward eliminating the problem. Maps of the target 

area are often used by programs to make block 

inspection assignments, show changing patterns in 

infestations and their causative conditions, and measure 

progress in addressing the rodent problem. Table 2 

shows examples of the types of major deficiencies and 

associated map colors on a GIS map.

Maps may be prepared for other causative conditions, 

including water sources and entry and access routes. 

These maps can be used as a tool to determine 

priorities for corrective actions.

The goal of an IPM program should be to reduce 

rodent populations and their causative conditions to 

a level that they no longer have an adverse effect on 

the community. The following set of criteria should be 

achieved for a block or for the defined target area:

2% or less of the premises 

with active exterior rodent signs and either 

15% or less of the premises 

with exposed garbage,

or

30% or less of the premises with 

unapproved refuse storage.

These criteria are based on those used by the federal 

urban rat control program directed by CDC from 

1972 to 1981 throughout the United States. About 

80,000 blocks in 65 communities heavily infested 

with rats applied these criteria in their IPM efforts and 

attained an essentially rat-free and environmentally 

improved status. Hence, this set of criteria became 

widely accepted as the tolerance limit for a block, target 

area, or community. Local rodent IPM authorities may 

establish tolerance limits for other deficiency categories 

as needed. Tolerance limits will provide evaluative 

feedback to determine the direction to be taken by a 

rodent IPM program. 

Table 2. Types of Major Exterior Deficiencies and Associated Colors on a GIS Map 

Categories Premises Deficient (%)* Color on Map

Rodent Infestation

Active Rodent Signs None in block Blue

2% or less Green

2%–25% Yellow

26%–100% Red

Rodent Food

Unapproved Refuse Storage None in block Blue

30% or less Green

30%–60% Yellow

61%–100% Red

Exposed Garbage None in block Blue

15% or less Green

15%–30% Yellow

31%–100% Red

*Percentages have been rounded to the nearest whole number.

Infestation is calculated as the number of premises with active rodent signs divided by the total number of 

premises on a block times 100.

Integrated Pest Management: Conducting Urban Rodent Surveys 16
•••••••••

•••••••••

Comprehensive surveys (i.e., premises-by-premises) 

to identify active rodent signs and their causative 

conditions should be conducted, at a minimum, twice 

yearly for all blocks that have not reached the tolerance 

limits for active rodent signs, exposed garbage, or 

unapproved refuse storage. Comprehensive inspections 

should continue until 80% or more of the blocks in 

a target area have achieved the established tolerance 

limit and have maintained that status for at least 1 year. 

Thereafter, a sample survey procedure may be used two 

or more times a year to verify the status of the target 

area blocks that have achieved the tolerance limit; for 

the other blocks, comprehensive inspections should be 

conducted at least twice yearly.

If the survey data indicate that conditions have 

deteriorated and that rates of active rodent signs, 

exposed garbage, and unapproved refuse storage have 

risen above the tolerance limit, appropriate IPM 

interventions will be required based on the analysis of 

the data. 

Interior Tolerance Limits

Interior inspections require visiting every room of every 

unit or every location of a structure on a premises. 

These visits provide inspectors with a detailed profile 

of the infestation and its causative conditions. One 

difficulty in this aspect of an urban IPM program 

is that inspectors are not likely to gain entry to all 

premises, units, or locations. 

From the standpoint of good public health practice, the 

tolerance limit for rats or mice in human living quarters 

should be zero; that is, rodents should not live with 

people. To achieve and sustain a zero-tolerance limit for 

rodent infestation for one or more dwelling units, the 

same criteria should apply as that for exterior exposed 

garbage and unapproved refuse storage.

For interior surveys, the following additional broadscale tolerance limit should be established:

15% or less of the premises with rodent entry and 

access routes within 5 feet (1.5 meters) of grade or 

other low horizontal surfaces.

This tolerance limit for entry and access routes may 

not fully address the problem of rodent access to 

exterior premises, but it greatly increases the likelihood 

of achieving the zero tolerance limit for rodents in 

dwelling units, a key quality-of-life issue. This limit 

also promotes the application of rodent-stoppage 

interventions that are essential to reducing interior 

infestation.

The urban rodent survey is an essential tool in the IPM 

effort to manage rodent problems. The survey provides 

precise information about infestations and their 

causative conditions, and it measures progress toward 

their elimination.

This manual should serve as a basis for designing 

and conducting valid surveys to determine the 

magnitude of infestation problems and their causes, 

for implementing interventions, and for measuring 

progress. The survey, however, is only a framework for 

the many activities of a rodent IPM program. An IPM 

program cannot succeed without the commitment of 

the local health authority, other professionals, and the 

public.

Integrated Pest Management: Conducting Urban Rodent Surveys 17
Selected References

Center for Disease Control. National urban rat control 

project directors meeting; 1974 Apr 30–May 2; 

Atlanta, Georgia. Atlanta: US Department of Health, 

Education, and Welfare; 1974.

Center for Disease Control. Urban rat surveys. Atlanta: 

US Department of Health, Education, and Welfare; 

1974. 

Center for Disease Control. Urban rat control program 

survey methodology. Atlanta: US Department of 

Health, Education, and Welfare; 1975.

Center for Disease Control. Urban rat control program: 

interior rat control: definitions and criteria. Atlanta: US 

Department of Health, Education, and Welfare; 1977. 

Center for Disease Control. Urban rat control program: 

roof rat control: definitions and criteria. Atlanta: US 

Department of Health, Education, and Welfare; 1977. 

Centers for Disease Control. Urban rat surveys. 

Atlanta: US Department of Health and Human 

Services; 1980. HHS publication number CDC 80-

8344. 

Davis DE. In: Houk VN, editor. Focus: urban rat 

control/environmental health abstracts. Atlanta: US 

Department of Health, Education, and Welfare; 1976.

Frantz SC. Evaluation of rodent infestations in Nepal: 

a preliminary report. J Nepal Med Assoc. 1974:12(3–

4):17–32.

Frantz SC. The behavioral/ecological milieu of godown 

bandicoot rats—implications for environmental 

manipulation. In: Proceedings of the All India Rodent 

Seminar, Ahmedabad, Rodent Control Project; 1975 

Sep 23–26, Sidhpur, Gujarat, India. Sidhpur, Gujarat, 

India: Rodent Control Project; 1977. p. 95–101. 

Frantz SC. Rodent control: a case for integrated pest 

management program (IPM). In: Preventive Health 

Services Conference; 1979 May 7–11; Ellenville, New 

York. Atlanta: US Department of Health, Education, 

and Welfare; 1979.

Frantz SC. Architecture and commensal vertebrate pest 

management. In: Kundsin RB, editor. Architectural 

design and indoor microbial pollution. New York: 

Oxford University Press; 1988. p. 228–95.

Frantz SC. Integrated pest management in New York 

State. IPM Practitioner. 1996;18(2):8–10.

Frantz SC, Comings JP. 1976. Evaluation of urban 

rodent infestations—An approach in Nepal. In: Siebe 

CC, editor. Proceedings of the Seventh Vertebrate Pest 

Conference; 1976 Mar 9–11; Monterey, California. 

Davis, CA: University of California at Davis. p. 279–

90.

Frantz SC, Davis DE. Bionomics and integrated pest 

management of commensal rodents. In: Gorham JR, 

editor. Ecology and management of food-industry 

pests. FDA Technical Bulletin 4. Arlington, VA: 

Association of Official Analytical Chemists. 1991. p. 

243–313. 

Frantz SC, Gallagher D. IPM implementation in 

New York State government facilities. In: Seventeenth 

Vertebrate Pest Conference; 1996 Mar 4–7.Rohnert 

Park, CA. Davis, CA: University of California at Davis. 

1996.

Littig KS, Bjornson BF, Pratt HD, Fehn CF. Urban rat 

surveys. Washington, DC: US Department of Health, 

Education, and Welfare; no date. Available at URL: 

http://courses.washington.edu/envh442/Readings/

Reading03.pdf.

Centers for Disease Control and Prevention, National 

Center for Environmental Health. Managing rodents 

and mosquitoes through integrated pest management 

[video]. A Public Health Training Network Satellite 

Broadcast, 2003 Sep 18. Atlanta: US Department of 

Health and Human Services; 2003. 

Integrated Pest Management: Conducting Urban Rodent Surveys 18
Appendix A—Survey Forms
 

Integrated Pest Management: Conducting Urban Rodent Surveys 19
Figure 1. Block Record—Exterior Rodent Inspection and Sanitation Form (blank)
	

BLOCK RECORD—EXTERIOR RODENT INSPECTION AND SANITATION FORM
	

City: Census Tract: Inspector(s): Inspector(s) 

Initials: 

Additional Block Information: Date mm dd yy 

County: Block Number: 

Page of Pages 

Premises Type Premises Details Food Water Harborage Entry/ 

Access 

1. Residential2. Commercial & Residential3. Commercial4. Vacant Lot5. Food-Commercial6. Vacant9. Unapproved Refuse Storage10. Exposed Garbage13. Standing Water 14. Condensate15. Leaks16. Abandoned Vehicles17. Abandoned Appliances18. Lumber/Clutter on Ground19. Other Large Rubbish20. Outbuildings/Privies21. Board Fences & Walls 22. Plant-Related23. Structural Deficiencies24. Pipe/Wiring Gaps25. Active Signs 

No. Premises Address 

TOTAL

Remarks (continue on back of form as necessary): 

7. No. of Dwelling Units8. Sewers on Premises11. Animal Food 12. Other Food & Plants
 

Figure 2. Block Record—Exterior Rodent Inspection and Sanitation Form (completed example)
	

BLOCK RECORD—EXTERIOR RODENT INSPECTION AND SANITATION FORM
	

City: Metropolis Census Tract:

54-A 

Inspector(s):

H. Smith, 

A. Jones 

Inspector(s) 

Initials: HS, AJ 

Additional Block Information: 15 premises 

total accessed Date 07 mm 26 dd 05 yy 

County: Chandler Block Number:

27 Page 1 of 2 Pages 

Premises Type Premises Details Food Water Harborage Entry/ 

Access 

1. Residential2. Commercial & Residential3. Commercial4. Vacant Lot5. Food-Commercial6. Vacant7. No. of Dwelling Units8. Sewers on Premises9. Unapproved Refuse Storage10. Exposed Garbage11. Animal Food 12. Other Food & Plants13. Standing Water 14. Condensate15. Leaks16. Abandoned Vehicles17. Abandoned Appliances18. Lumber/Clutter on Ground19. Other Large Rubbish20. Outbuildings/Privies21. Board Fences & Walls 22. Plant-Related23. Structural Deficiencies24. Pipe/Wiring Gaps25. Active Signs 

No. Premises Address 

1 646 Ruskin St.  6 

4 

0 

8 

6 

— — 

4 

3 

— — 

2 

      

2 648 Ruskin St.       

3 650 Ruskin St.      

4 652 Ruskin St.     

5 654 Ruskin St.     

6 [Chavez Ave.; data not shown] — — — — — — — — — — — — — — — — — — — — — — — 

7 661 Biko St.       

8 663 Biko St.      

9 [King St.; data not shown] — — — — — — — — — — — — — — — — — — — — — — — 

10 1243 King St.     

TOTAL 7 0 0 1 0 0 33 1 7 6 2 2 2 0 2 0 1 1 1 2 3 2 4 1 5 

N

B 

i 

k 

o 

S 

T 

R 

u 

s 

k 

i 

n 

S 

T 

King Ave 

Chavez Ave 

Remarks (continue on back of form as necessary): 
City: Census Tract: Inspector(s): Inspector(s) 

Initials: 

Additional Information: Date mm dd yy 

County: Block Number: Page of Pages 

Premises Type Premises Details Food Water Harborage Entry/ 

Access 

Figure 3. Summary—Exterior Rodent Inspection and Sanitation Form (blank) 

SUMMARY—EXTERIOR RODENT INSPECTION AND SANITATION FORM
	

Number of Premises With Deficiencies
	

Block NumberNumber of Premises

Residential 1.

 Commercial & Residential 2. Commercial 3. Vacant Lot 4. Food-Commercial 5. Vacant 6. No of Dwelling Units 7. Sewers on Premises 8. Unapproved Refuse Storage 9.

 Exposed Garbage 10.

Animal Food 11. 

Other Food & Plants 12.

 Standing Water 13. Condensate 14.

 Leaks 15.

Abandoned Vehicles 16. Abandoned Appliances 17. 

Lumber/Clutter on Ground 18.

 Other Large Rubbish 19. Outbuildings/Privies 20. Board Fences & Walls 21. Plant-Related 22. Structural Deficiencies 23. Pipe/Wiring Gaps 24.

Active Signs 25. 

Total

Percent

Remarks (continue on back of form as necessary): 
Figure 4. Summary—Exterior Rodent Inspection and Sanitation Form (completed example) 

SUMMARY—EXTERIOR RODENT INSPECTION AND SANITATION FORM
	

Number of Premises With Deficiencies
	

City: Metropolis Census Tract: Inspector(s): Inspector(s) Additional Information: Date 07 mm 26 dd 05 yy 54-A H. Smith Initials: 

County: Chandler A. Jones HS, AJ Block Number: Page 1 of 1 Pages 27 

Entry/ Premises Type Premises Details Food Water Harborage Access 

27 15 10 2 

28 15 6 3 

29 9 9 0 

30 22 22 0 

NOTE: Table does not show all data 

Total 220 195 4 

2 1 

6 0 

0 0 

0 2 

7 14 

2 2 38
	 2
	

20
	 0
	

36
	 2
	

30
	 2
	

264
	 18
	

11
	 8 5 2 

2 3 

0 0 

3 2 

12 12 

3 1 1 

0 

0 

0 

9 

2 1 1 

0 

0 

3 

10 

5 

4 0 5 5 8 3 6 

2 0 9 7 3 0 1 1 4 0 2 4 9 5 4 

0 0 6 6 0 0 2 1 3 0 2 2 4 2 3 

0 4 12 8 4 2 1 1 6 0 0 6 5 6 7 

4 22 115 85 21 6 8 12 38 4 18 30 70 14 50 

Block NumberNumber of Premises

Residential 1.

 Commercial & Residential 2. Commercial 3. Vacant Lot 4. Food-Commercial 5. Vacant 6. No of Dwelling Units 7. Sewers on Premises 8. Unapproved Refuse Storage 9.

 Exposed Garbage 10.

Animal Food 11. 

Other Food & Plants 12.

 Standing Water 13. Condensate 14. Leaks 15.

Abandoned Vehicles 16. Abandoned Appliances 17. 

Lumber/Clutter on Ground 18.

 Other Large Rubbish 19. Outbuildings/Privies 20. Board Fences & Walls 21. Plant-Related 22. Structural Deficiencies 23. Pipe/Wiring Gaps 24.

Active Signs 25. 

Percent 89 2 3 6 2 10 NA 8 52 39 6 6 10 3 4 4 6 17 2 8 14 32 6 23 

Remarks (continue on back of form as necessary): 
Appendix B—Selecting a Random 

Sample

Suppose there is a finite population from which we wish 

to draw random sample of N elements. One method of 

creating a random sample would be to assign a number 

to each number of the population (e.g., block), put a set 

of numbered tags corresponding to the elements into a 

box, shake the box, and draw N tags from it. The numbers 

on these N tags would correspond to the elements to be 

selected. This method could be satisfactory, but it would 

require considerable labor to prepare the tags. 

Instead of preparing numbered tags, we can use a table 

of random numbers. Such a table consists of numbers 

chosen in a fashion similar to drawing numbered tags 

out of a box. The table is so created that all numbers 0, 

1... 9 appear with approxi¬mately the same frequency. 

By combining numbers in pairs, we have numbers from 

00 to 99; by combining the numbers three at a time we 

have numbers from 000 to 999. The numbers can be 

combined as much as necessary. 

Table B-1 is a table of random numbers that can be 

used to select a random sample. The starting point in 

the table should be selected randomly; one method is 

to close your eyes and place your finger on a page of the 

table. 

Example

To select at random 20 blocks from a total population 

of 427 blocks in the area to be surveyed, assign the 

numbers 1 through 427 to the 427 blocks. To assign 

these numbers, use a map of the area so that each block 

is clearly defined. 

Because 427 is a three digit number, combine three 

columns in the table and read them together. (For a 

two-digit number, combine and read two columns; for 

a four-digit number, combine and read four columns.) 

A column is a single-digit list of vertical numbers. In 

this table, columns are grouped in pairs. 

•	­ Select a starting point on the table randomly. 

•	­ If the number at the starting point is 427 or 

less, select the block having that number. 

•	­ If the number of the starting point is greater, 

continue down the horizontal rows until the 

number 427 or less is reached, and select that 

number. 

•	­ In either case, continue down the rows and, if 

necessary, down the columns beginning at the 

top of the page until 20 numbers of 427 or 

less have been located. 

•	­ This list will be the 20 blocks surveyed. 

NOTES: Ignore any number over 427 because only 427 

blocks exist in the total population to be surveyed. Having 

the same number 427 or less more than once does not 

matter. Continue until 20 numbers are selected. 

Assuming 20 blocks will be chosen from a total 

population of 427 blocks, the selection process can be 

illustrated as follows: 

•	­ Suppose the randomly chosen starting point 

is the number formed by vertical columns 

25–27 (remember that each digit is a column) 

in the 28th horizontal row of the third page of 

random numbers (page B-4). 

•	­ This number is 724, which is more than 

427, so continue down the same columns 

by horizontal row until the number 081 is 

reached. Block 81 would be the first block 

chosen. 

The other 19 blocks chosen would be 361, 373, 61 (ignore 

533 because it is over 427), 164, 224, 118 (ignore 876 and 

948), 300, 9 (ignore 565 and 613), 140 (ignore 724, 453, and 

717), 38 (move to the top of the page, vertical columns 

28–30 for the remaining numbers) 401, 225, 233, 328, 5, 

184, 117, 376, and 114. 

•	­ The last nine blocks chosen (beginning with 

401) are found in the numbers formed by 

combining columns 28–30 in row 1 on the 

same page. 

Integrated Pest Management: Conducting Urban Rodent Surveys B-1
Table B-1. Random Numbers Table
 

60

51

11

58

39

32

73

55

42

60

94

77

17

08

95

23

66

00

53

71

91

61

75

94

45

43

62

38

28

91

29

44

51

28

48

03

99

44

88

60

32

53

88

26

88

59

89

35

06

81

18

88

67

28

07

38

93

01

86

89

85

40

92

56

26

04

35

61

24

19

44

92

36

77

75

93

78

19

59

30

82

91

37

62

11

13

36

15

61

66

47

83

41

23

17

82

47

17

29

55

26

93

31

86

75

06

84

23

77

03

43

49

77

60

83

23

03

94

15

41

02

91

41

56

75

57

37

03

12

22

22

73

15

41

14

83

39

02

96

44

53

68

72

07

98 21 58 56 49 01 56 73 29 70 96 79 51 75 51 54 10 04

58 66 30 25 87 71 58 60 02 14 93 62 47 90 05 72 42 66

73 19 41 31 89 19 46 89 30 16 01 67 24 05 63 84 66 08

05 34 64 70 94 96 64 64 82 20 70 86 81 05 47 94 85 92

49 19 64 88 49 12 25 36 06 64 90 10 52 82 07 81 00 44

65 47 82 15 40 03 55 25 77 89 24 12 80 25 89 26 72 34

96 78 95 93 63 77 81 19 84 56 57 98 26 49 00 91 25 97

81 02 24 41 55 37 14 04 63 99 10 03 94 94 77 94 91 30

26 51 78 95 91 26 47 84 53 38 77 77 90 05 46 79 57 93

66 01 73 18 11 12 99 17 36 06 48 49 07 62 67 25 36 21

71 72 48 27 15 89 10 58 67 24 18 19 51 67 18 26 94 77

86 79 60 02 64 79 64 81 16 15 88 44 37 50 48 56 48 67

85 82 16 15 19 22 24 25 70 99 19 89 19 93 64 91 12 11

74 16 36 34 81 09 18 69 85 82 20 02 96 71 75 38 76 52

47 99 06 63 94 82 03 94 90 05 84 61 37 18 09 74 10 91

22 28 86 84 56 54 14 78 88 52 74 08 57 96 64 79 61 29

78 85 79 54 10 73 26 40 16 27 20 30 30 00 46 74 13 24

06 59 42 96 77 99 02 90 05 25 69 65 44 31 71 67 06 12

32 40 10 54 24 30 00 52 93 63 99 07 20 12 71 59 36 21

67 26 84 71 58 58 82 25 56 46 77 80 22 34 96 73 29 70

42 79 56 72 35 49 12 89 14 81 04 42 73 07 39 35 77 96

86 88 42 89 17 42 67 20 27 19 75 26 24 31 97 56 43 69

80 32 39 40 10 06 45 19 29 68 34 89 32 21 88 34 45 05

30 09 66 30 13 17 77 81 01 66 19 35 75 48 38 72 45 41

28 97 60 03 86 99 12 13 10 66 24 37 48 39 67 03 95 97

25 85 85 78 87 58 59 21 29 73 19 76 72 50 21 37 53 34

61 15 20 18 15 31 90 01 57 96 75 47 82 16 36 17 62 53

59 49 04 14 41 26 92 37 58 81 12 30 33 30 19 72 42 98

38 75 49 21 88 45 23 62 51 86 87 69 78 87 56 47 73 17

82 14 78 83 27 23 98 22 26 80 36 00 86 81 00 49 01 91

43 62 63 88 38 97 42 90 04 98 38 82 21 85 82 19 89 22

09 34 80 38 95 82 07 45 44 13 61 23 99 06 78 78 90 11

35 93 62 68 40 20 73 04 19 82 14 70 91 25 48 61 33 18

07 75 46 52 87 71 81 09 46 55 17 35 70 88 49 11 63 97

23 69 64 76 70 92 51 55 35 98 25 53 47 78 83 41 42 90

15 92 37 29 74 20 14 17 97 45 25 64 88 50 16 20 78 86

24 38 80 29 50 14 70 96 76 61 26 73 22 17 57 86 78 80

42 91 25 42 79 65 53 36 21 66 22 34 64 72 55 04 00 70

85 76 72 42 80 40 07 49 16 28 81 18 12 24 04 69 65 31

45 32 39 76 76 74 15 63 87 56 57 99 04 68 43 71 78 72

79 57 89 14 70 98 29 20 07 67 03 95 93 72 44 19 79 53

46 62 54 23 81 02 56 74 04 74 23 74 19 83 36 28 85 86

81 16 48 43 81 09 11 67 00 82 20 77 95 99 13 62 45 20

25 39 53 68 35 76 62 58 64 87 65 37 31 87 59 32 40 08

33 08 98 29 19 72 35 86 86 98 23 99 16 47 90 05 64 79

53 43 52 98 34 46 57 93 62 64 74 03 82 12 43 76 68 42

35 47 75 49 09 16 53 64 85 96 68 34 75 43 79 60 04 29

56 68 48 35 68 31 97 58 75 29 34 94 91 24 08 82 12 93

Integrated Pest Management: Conducting Urban Rodent Surveys B-2
Table B-1. Random Numbers Table
 

87 69 76 54 25 83 30 47 87 68 31 63 95 85 81 09 02 52 99 18 14

85 86 90 10 02 23 92 43 61 33 04 35 58 58 80 25 73 16 13 42 99

17 81 10 27 04 24 25 89 23 88 49 08 82 10 95 99 13 66 21 74 05

90 05 48 61 28 81 07 46 75 44 32 78 96 74 00 23 84 62 73 19 96

76 53 45 31 94 96 69 74 02 44 32 34 63 80 30 22 22 43 58 67 13

09 12 33 32 61 25 93 71 71 70 94 81 00 74 24 24 15 78 71 58 56

68 51 69 71 71 73 09 95 99 17 88 53 47 78 79 53 57 99 07 62 64

87 69 61 40 02 37 38 84 68 53 33 10 75 40 01 38 94 85 75 40 16

17 54 28 83 50 48 62 68 54 00 40 14 35 53 36 33 10 90 09 33 19

61 12 25 56 64 90 10 55 08 20 19 67 04 05 73 05 85 90 02 94 94

91 27 01 70 90 10 07 29 29 68 34 77 78 81 18 01 52 88 39 55 20

08 68 36 23 79 50 17 49 01 85 91 17 86 96 78 91 28 75 35 79 49

11 01 37 34 81 06 35 55 18 41 63 98 23 84 60 02 10 25 59 54 25

62 45 43 61 15 58 76 60 07 45 11 73 06 59 48 53 68 42 81 21 99

07 72 52 90 07 74 11 85 83 45 18 23 95 85 79 68 40 15 49 04 67

09 81 06 78 94 90 08 90 02 52 85 84 68 57 96 64 64 89 26 57 90

05 28 71 66 12 10 70 93 69 65 48 54 09 52 78 92 37 63 83 48 58

58 76 74 06 32 38 95 86 92 39 65 45 03 88 34 45 15 48 35 84 65

51 68 40 03 11 63 99 14 87 57 98 25 52 74 23 97 53 41 28 96 76

70 87 69 76 53 44 03 25 93 60 18 16 11 98 25 71 63 93 56 42 96

79 51 61 13 09 47 94 78 73 10 33 01 49 00 00 88 46 50 29 35 78

84 65 49 12 96 64 78 75 40 20 06 88 54 17 87 59 53 36 09 10 36

29 69 73 17 87 78 88 55 25 85 96 67 21 79 47 98 32 44 15 11 90

00 14 78 76 73 03 48 55 34 96 65 40 18 07 37 61 23 87 58 70 93

64 80 31 80 40 28 83 47 97 57 96 74 06 39 68 39 82 27 17 77 80

35 68 50 37 14 65 35 74 20 45 31 94 80 32 32 44 37 55 15 43 78

87 71 68 41 61 40 25 32 71 63 87 65 36 14 96 73 10 88 50 17 76

51 73 16 52 80 29 30 10 72 52 82 20 69 65 33 36 36 01 18 59 24

25 70 88 35 50 19 20 04 60 19 51 67 24 25 63 91 20 49 11 95 85

90 10 17 84 62 59 54 10 18 13 14 90 10 57 91 17 47 89 12 92 42

82 14 58 68 47 93 67 27 39 56 45 14 96 70 92 37 46 78 75 35 49

09 41 40 05 33 19 74 20 09 31 73 09 86 86 88 53 65 47 72 38 96

66 14 86 97 58 78 85 85 98 36 31 98 28 83 44 41 61 28 93 58 75

39 36 34 64 87 58 67 12 02 01 95 96 77 85 89 22 51 75 30 08 87

77 87 75 26 53 59 37 15 99 02 81 10 54 16 37 41 27 48 42 90 10

64 92 33 27 40 00 33 12 52 95 93 59 44 41 46 62 60 04 26 33 18

69 79 53 44 24 06 94 83 30 47 87 65 42 80 30 04 03 52 98 26 59

24 03 07 16 12 85 96 80 27 52 97 45 15 73 24 14 93 70 89 22 45

38 84 62 59 38 70 90 01 62 69 80 30 21 54 28 84 61 38 90 10 67

16 14 60 06 47 80 25 68 53 35 97 51 62 47 98 39 37 34 80 22 07

88 53 37 15 16 23 73 14 84 55 26 78 90 01 36 01 69 84 60 17 32

43 42 92 46 63 92 38 89 25 87 55 32 19 37 44 00 75 26 22 16 29

39 65 54 12 90 01 86 82 07 01 92 45 19 74 20 60 17 29 24 11 74

22 10 52 93 59 48 33 22 06 95 97 59 40 06 92 41 36 38 85 78 84

55 08 09 91 16 62 73 19 92 37 23 63 86 97 56 74 00 88 33 01 82

08 32 37 57 97 58 73 26 89 19 29 13 24 41 60 20 56 58 88 41 56

69 73 13 05 16 08 89 13 00 37 19 54 03 34 96 79 65 56 57 97 48

32 73 13 20 17 94 89 31 90 01 84 53 46 88 53 46 57 98 23 77 97

Integrated Pest Management: Conducting Urban Rodent Surveys B-3
Table B-1. Random Numbers Table
 

84 55 38 87 70 94 82 10 44 19 35 45 16 14 01 05 90 06 17 39 80

27 17 56 60 16 17 73 07 33 37 57 91 11 82 25 72 38 95 88 38 91

30 53 36 31 81 08 81 06 76 53 66 07 11 68 41 56 59 49 07 25 44

12 21 90 07 82 03 16 28 76 73 07 62 44 35 69 77 97 47 93 57 77

96 73 07 90 10 87 71 82 17 56 69 81 20 72 33 36 15 56 70 98 28

76 66 10 40 07 95 89 18 16 23 77 87 56 48 42 97 56 48 29 16 55

05 16 12 73 25 48 27 19 49 09 11 91 15 83 28 58 65 33 08 58 59

30 36 12 40 17 56 54 29 15 70 89 15 68 36 31 84 62 56 49 08 24

27 05 29 12 27 32 50 28 99 05 88 42 95 90 05 35 82 12 32 39 49

05 14 71 77 91 27 01 73 12 24 08 80 37 28 90 08 54 12 17 55 36

25 62 57 97 56 60 12 95 94 90 05 28 93 67 01 88 39 75 35 76 60

19 60 10 44 34 65 47 68 44 20 70 88 48 55 35 45 06 44 26 19 75

33 12 13 69 65 32 41 23 86 95 89 15 82 21 84 62 61 15 99 09 51

71 62 70 87 66 21 83 41 47 84 67 10 65 36 30 07 68 37 54 04 07

63 84 61 35 49 04 59 39 38 97 50 22 50 39 45 14 06 26 50 27 18

21 74 01 30 44 28 90 05 92 54 25 50 52 99 01 73 17 87 59 46 86

88 35 82 23 87 65 35 81 13 28 75 35 50 37 57 98 26 51 67 24 18

58 62 44 36 09 68 34 91 27 42 91 29 67 07 69 83 42 98 38 99 15

76 69 68 41 18 27 38 80 41 23 97 60 14 91 17 78 78 84 65 61 11

79 61 39 79 51 70 93 66 08 44 02 08 17 63 76 67 16 38 96 77 81

06 92 53 46 77 93 67 13 24 25 85 94 78 94 93 68 47 90 08 44 34

86 96 68 41 19 69 72 45 06 08 83 50 33 16 05 31 84 72 39 38 96

78 72 45 15 68 52 94 96 73 09 49 20 23 81 14 23 72 44 08 03 73

10 90 06 81 04 68 40 17 99 06 55 08 35 64 63 87 60 07 98 24 26

93 58 71 67 19 82 23 72 51 85 80 30 21 86 94 76 64 81 03 10 01

31 78 77 97 51 65 33 21 91 12 22 09 09 21 92 37 41 45 23 67 23

63 90 02 16 33 35 54 06 33 09 33 15 15 71 57 99 16 51 81 18 27

47 96 70 91 19 79 65 49 02 89 19 28 72 49 08 82 05 15 99 14 29

57 92 46 60 06 37 37 20 39 64 71 78 76 69 63 99 13 41 51 60 08

16 44 11 01 28 82 09 11 94 90 09 13 08 17 47 91 18 12 12 80 28

60 19 88 45 17 76 52 98 38 96 63 98 36 11 07 03 38 98 32 58 67

03 48 66 28 96 77 99 00 11 89 25 61 37 30 21 54 19 22 54 17 85

82 21 61 30 45 04 32 59 21 57 98 24 06 11 44 04 13 15 12 75 27

28 91 20 11 03 34 94 85 85 74 24 04 53 33 28 69 78 74 21 99 06

35 68 37 27 01 05 73 02 25 84 53 37 16 41 29 28 74 08 09 35 89

17 89 23 83 50 27 01 72 52 87 73 14 22 47 68 41 47 79 53 38 84

61 40 15 89 20 66 13 07 43 79 68 40 11 84 57 82 26 27 31 87 56

44 20 21 47 79 48 64 71 78 83 28 86 87 67 23 88 51 86 85 87 60

10 20 06 68 35 64 63 90 06 14 76 57 94 89 31 92 37 17 43 74 18

08 86 97 40 06 15 77 78 93 71 71 72 30 04 08 47 83 50 41 58 88

36 14 78 74 17 99 16 21 74 01 55 14 00 96 73 23 56 69 83 38 91

26 80 36 02 17 80 39 38 67 00 08 87 56 54 18 76 55 22 02 39 61

22 27 01 34 56 48 32 61 40 21 38 87 61 37 49 16 56 58 79 59 38

96 80 34 42 87 60 03 99 16 25 55 08 14 04 04 16 36 07 91 18 16

44 29 20 03 62 69 71 71 69 84 67 23 72 42 97 46 54 23 60 02 71

74 08 31 79 67 24 16 05 35 43 58 88 45 39 53 57 93 63 90 02 66

01 86 95 83 38 65 36 08 24 17 67 26 71 73 18 67 00 88 45 19 99

08 29 63 76 55 17 88 51 72 51 90 03 03 86 83 49 17 92 45 37 63

Integrated Pest Management: Conducting Urban Rodent Surveys B-4
Table B-1. Random Numbers Table
 

09 93 60 20 52 82 14 15 13 38 92 50 36 35 47 81 01 96 85 45 15

76 59 42 82 10 80 32 37 11 90 00 10 43 87 65 33 02 52 94 82 12

00 95 97 52 94 86 79 49 09 30 49 10 72 34 94 77 97 57 97 41 33

12 03 84 69 60 01 75 36 14 81 19 27 16 24 29 64 71 63 80 33 07

01 39 74 06 35 60 06 09 17 94 88 53 58 59 38 70 90 09 53 61 26

64 87 56 62 65 43 69 82 06 87 67 08 90 06 62 68 43 65 34 71 66

12 94 88 42 95 90 07 60 17 96 63 99 07 89 19 62 56 50 50 38 95

92 45 35 52 93 74 07 35 89 13 20 34 98 36 17 75 28 94 91 16 47

86 84 62 63 79 69 83 29 53 34 92 40 13 21 76 69 71 71 69 86 97

54 01 30 02 32 63 79 46 89 29 36 22 27 15 85 90 08 48 57 96 79

58 81 12 61 27 40 19 89 30 36 43 87 60 80 20 08 38 93 68 50 27

13 61 33 03 17 43 73 06 53 56 45 46 54 10 89 28 88 34 50 18 26

93 74 19 47 91 13 43 49 05 87 71 83 45 32 71 61 17 33 12 33 14

72 40 09 56 42 68 57 94 79 56 68 32 34 87 64 64 65 39 68 45 36

09 61 25 90 03 72 55 32 31 83 36 09 45 13 27 41 53 59 39 40 05

70 94 79 61 43 54 12 95 92 50 50 27 02 98 36 39 71 69 83 31 59

49 23 70 87 75 29 26 30 47 98 22 48 42 77 99 09 65 40 07 84 67

21 89 12 02 56 41 58 70 94 90 07 39 63 87 69 85 96 67 21 67 25

56 45 23 67 25 84 55 17 90 02 24 46 73 08 28 59 28 90 04 99 03

67 19 98 33 30 47 98 33 02 48 59 47 70 93 70 99 09 26 68 30 28

76 76 77 79 71 83 33 39 40 07 73 05 91 18 11 50 36 20 19 43 67

07 01 28 58 59 53 60 19 58 85 82 15 09 02 15 71 72 34 77 88 46

78 87 66 28 78 90 07 44 03 62 52 94 88 50 52 94 91 21 79 61 20

38 83 38 68 34 49 03 34 73 18 22 25 68 47 99 13 61 18 17 47 49

22 02 68 34 87 72 34 79 57 75 48 29 26 29 62 73 15 35 68 51 79

50 38 91 20 34 70 96 64 64 85 76 53 67 24 21 73 22 52 84 64 62

51 84 53 55 34 49 05 23 92 45 07 83 34 63 97 42 90 03 35 46 49

04 83 41 46 61 42 86 78 79 64 65 34 85 97 47 84 52 84 67 18 18

66 31 58 71 80 31 95 92 50 22 59 43 50 38 66 27 47 96 73 07 11

40 08 17 85 88 33 01 63 78 80 38 76 56 75 25 92 39 58 84 54 06

14 11 47 92 47 93 73 03 12 51 59 49 01 63 86 91 13 03 64 82 11

66 06 95 84 57 93 67 05 68 44 27 36 04 45 03 75 39 48 37 55 32

60 04 39 40 01 67 16 21 37 61 30 20 74 22 28 86 98 24 09 94 77

94 95 97 48 34 43 75 39 57 96 68 35 80 38 65 60 16 02 08 11 80

33 16 28 79 52 99 08 34 43 56 75 41 51 83 28 93 66 02 09 30 42

44 05 05 84 59 31 59 32 46 49 07 22 43 80 38 86 91 32 90 04

13 10 55 40 20 56 43 78 87 60 07 17 30 05 22 15 59 26 73 09 12

51 87 62 62 49 22 42 84 64 68 38 98 24 44 00 67 00 40 12 59 44

13 64 89 23 99 04 48 27 40 21 97 55 22 60 12 43 84 60 03 10 62

53 67 17 92 46 62 61 23 54 01 95 96 68 47 95 98 36 00 66 11 53

54 00 28 87 58 70 97 51 81 18 27 33 10 48 27 49 01 92 51 53 46

64 84 61 43 73 21 99 19 53 64 80 42 68 51 65 35 62 74 17 35 47

83 37 33 08 57 89 22 01 38 77 83 45 39 48 62 46 74 05 91 13 62

47 90 01 85 81 17 63 96 67 16 05 40 14 74 19 27 00 45 46 87 70

91 24 07 68 56 47 68 54 01 88 42 88 49 06 98 38 93 68 51 80 38

96 64 66 03 55 20 36 16 47 90 01 76 75 50 42 89 26 73 24 00 19

25 50 48 39 60 07 92 38 85 79 70 90 06 85 83 29 53 41 61 12 71

70 94 87 59 24 03 33 15 84 51 71 59 25 76 76 53 46 86 99 05 52

Integrated Pest Management: Conducting Urban Rodent Surveys B-5
Table B-1. Random Numbers Table
 

95 97 43 49 15 65 41 28 73 09 13 22 04 17 31 77 93 71 61 30 38

79 61 20 28 58 58 86 99 06 53 40 14 61 26 25 93 68 35 80 42 99

17 87 63 85 75 24 21 89 19 71 80 40 09 50 39 79 55 10 90 03 09

70 97 53 41 43 47 68 47 90 08 35 71 73 16 04 28 80 31 70 89 14

01 72 48 55 25 32 69 63 92 53 37 53 59 41 45 42 73 23 70 96 69

70 92 39 50 46 63 92 38 72 54 13 36 19 95 84 67 06 09 21 69 59

34 93 61 16 63 80 43 81 02 48 30 12 29 31 99 10 38 73 13 23 73

21 90 06 24 09 50 43 63 80 33 15 53 34 92 41 60 02 38 97 51 83

30 25 96 63 94 94 96 79 59 48 67 04 73 18 15 94 88 53 38 67 21

61 11 58 59 52 96 64 87 66 09 90 00 91 19 62 75 34 83 29 60 00

64 73 04 84 70 90 02 28 86 87 75 36 16 32 47 76 64 78 93 73 05

73 13 52 98 22 19 88 49 18 42 79 57 95 97 59 29 24 26 92 53 47

92 52 89 14 56 60 17 56 48 32 30 31 63 77 77 90 09 84 69 69 81

15 78 96 78 84 52 99 18 29 40 10 40 28 59 42 84 70 97 44 32 32

19 91 31 62 51 85 85 76 57 99 09 54 15 60 13 11 02 99 15 35 82

16 61 40 02 31 89 26 44 09 01 94 92 50 17 72 55 35 65 34 68 33

06 30 02 96 74 07 60 09 79 51 81 10 03 55 26 45 39 42 88 53 44

32 60 07 67 06 26 82 07 62 65 43 44 06 12 33 28 56 50 19 44 07

99 11 07 15 07 96 66 15 94 81 20 49 10 40 10 70 97 42 68 43 50

31 61 35 73 13 60 09 86 94 94 80 27 52 84 59 44 13 24 00 35 80

41 28 83 45 44 00 64 79 53 36 31 65 45 23 82 08 57 94 90 00 28

96 65 44 19 26 67 13 28 94 76 58 55 19 97 40 13 09 58 83 32 39

35 47 69 66 15 87 61 21 36 01 77 90 06 61 16 00 85 78 94 84 60

06 96 69 66 20 04 71 71 73 08 55 10 18 51 55 32 20 53 62 66 17

93 68 39 35 69 66 23 72 44 02 71 75 42 93 72 32 70 91 11 78 92

52 91 30 13 29 42 96 72 34 84 56 50 39 71 67 21 50 25 56 74 11

40 16 08 75 45 04 70 90 09 20 52 94 88 41 23 65 54 03 62 46 51

72 30 04 83 45 03 28 81 20 18 01 14 26 51 73 21 52 79 55 27 18

20 46 76 73 21 77 82 08 44 06 50 47 86 96 80 38 92 35 99 12 07

73 17 63 95 98 22 03 07 80 39 52 71 60 06 39 72 38 90 08 03 38

65 48 46 77 90 10 23 60 14 16 01 87 72 48 54 16 58 64 81 02 18

15 91 29 59 32 19 95 83 29 29 14 89 24 08 61 32 32 70 96 76 65

37 60 00 15 91 30 55 23 72 56 71 63 94 90 08 99 03 51 83 29 70

97 43 63 89 19 76 67 21 53 61 20 28 58 60 12 53 40 07 92 37 43

64 87 78 88 54 00 83 35 82 13 53 49 07 76 67 16 04 06 80 24 50

48 58 85 80 38 80 23 62 63 99 02 56 70 96 81 18 26 91 18 12 02

16 09 21 93 76 55 27 18 20 03 00 60 07 93 57 90 00 34 45 16 37

47 89 10 56 65 35 93 66 06 78 72 51 74 03 01 55 39 35 92 36 08

23 94 84 58 70 90 01 98 35 52 89 26 46 63 79 46 73 25 85 93 69

85 81 01 04 89 32 55 14 00 31 81 06 62 48 45 35 60 12 14 93 74

15 13 03 45 40 30 42 79 47 79 57 76 73 17 80 21 65 35 56 55 24

28 85 88 40 04 24 06 14 43 61 43 59 39 48 52 84 60 20 01 15 78

95 91 15 75 40 03 30 49 07 52 93 57 75 48 53 59 26 64 81 05 58

81 12 10 61 21 67 16 10 34 88 34 89 31 83 36 23 96 72 38 70 85

87 65 53 43 48 36 35 51 88 47 97 52 94 84 69 84 56 63 84 56 43

46 52 93 71 84 69 64 62 54 07 95 97 42 93 63 80 25 53 51 75 26

29 68 41 41 52 70 86 97 51 78 71 63 92 44 05 29 72 39 47 92 48

36 04 89 15 10 65 56 64 85 95 89 13 47 90 09 11 91 28 92 46 81

Integrated Pest Management: Conducting Urban Rodent Surveys B-6
Table B-1. Random Numbers Table
 

52 88 40 03 69 80 36 28 99 10 71 82 06 02 50 50 52 74 08 58 63

94 96 79 69 65 32 72 53 59 29 56 70 89 33 14 01 13 40 10 01 38

97 44 25 99 06 67 12 99 14 82 10 80 24 03 44 31 94 80 27 09 45

43 77 89 13 28 75 47 84 56 47 98 35 71 75 29 25 27 46 60 10 83

38 79 54 02 14 93 59 33 41 45 28 70 94 89 12 93 56 61 15 66 26

85 97 43 52 94 81 19 30 42 79 60 04 22 31 94 88 44 00 34 65 57

75 48 41 23 90 07 95 81 00 54 09 41 33 15 20 30 07 62 75 31 96

80 46 53 61 00 52 82 11 26 47 96 72 43 48 65 46 66 08 62 64 82

24 46 82 26 69 81 18 60 03 66 02 36 40 17 87 77 92 41 18 37 55

32 77 94 84 68 38 68 44 02 28 67 12 80 31 85 78 91 28 80 38 87

76 75 37 63 76 60 09 74 01 39 41 52 81 01 13 73 03 43 46 78 81

11 96 71 74 12 58 75 34 45 36 01 47 85 87 62 62 53 42 69 80 30

33 14 41 34 67 19 70 87 59 45 11 71 82 26 91 17 89 21 82 19 27

30 03 47 69 85 75 48 54 28 92 36 01 37 63 98 28 94 82 09 63 97

47 97 43 55 16 45 05 38 68 32 37 62 59 53 52 94 91 29 21 97 41

25 99 14 97 49 00 64 78 80 29 74 19 80 28 54 00 46 74 01 44 02

06 36 42 92 53 64 72 41 45 28 73 15 50 50 33 01 65 58 75 26 25

83 47 86 96 64 62 68 44 01 49 07 37 25 63 82 08 38 98 31 72 32

64 68 52 93 74 05 69 81 09 50 43 79 49 02 80 37 56 45 41 55 24

10 61 37 44 05 63 93 58 72 56 55 21 99 09 09 49 04 15 59 49 06

26 68 42 95 92 42 99 07 44 00 19 93 54 00 97 44 27 08 06 33 02

03 71 60 01 80 24 52 72 32 57 95 83 33 40 07 81 02 65 61 24 16

13 10 04 62 57 92 49 22 01 16 51 89 30 05 31 81 07 11 13 27 13

63 95 98 20 71 65 56 57 77 79 61 31 87 63 76 59 34 97 51 73 24

01 61 15 54 04 17 68 31 82 08 81 05 11 48 38 80 37 57 85 87 77

98 31 80 42 88 47 99 08 96 72 29 41 29 10 96 79 49 03 11 46 79

50 18 62 72 42 95 99 15 39 35 79 65 58 57 86 83 39 81 17 53 69

62 55 15 68 43 66 03 01 60 13 74 07 79 50 21 71 67 26 34 58 59

54 23 67 11 64 75 47 74 06 20 03 98 35 75 45 03 12 24 08 78 71

67 18 30 09 64 64 84 57 97 44 25 60 00 29 55 18 01 03 07 65 49

09 98 31 88 38 75 43 69 80 37 15 25 28 54 13 57 99 14 95 86 90

08 39 45 03 00 48 59 27 32 26 54 15 82 18 12 61 31 72 54 01 83

41 28 82 23 59 42 70 98 20 31 96 79 61 16 03 92 40 09 85 98 38

65 41 23 62 63 91 32 34 57 78 95 98 25 84 67 14 93 61 39 50 15

43 60 07 96 70 91 13 21 91 21 70 94 95 92 46 74 21 85 88 34 87

77 90 07 96 66 23 73 10 69 78 73 16 64 77 96 69 62 63 88 42 98

35 54 18 78 89 20 00 81 09 10 91 14 94 78 88 46 50 26 55 28 92

39 51 76 65 35 58 62 64 75 41 21 73 25 73 12 80 22 51 69 76 75

44 38 97 45 14 64 91 19 99 08 56 55 17 83 33 30 26 63 87 60 00

86 87 77 79 56 45 04 02 84 55 33 05 60 10 88 42 69 61 21 54 31

65 42 80 45 28 77 94 77 96 71 77 91 17 93 66 30 07 74 23 57 77

87 65 54 23 71 75 49 01 66 26 37 22 40 05 67 12 22 09 05 33 38

96 62 52 71 76 65 34 91 30 18 30 23 68 37 48 28 82 22 15 23 81

07 71 84 68 46 83 49 15 47 92 48 34 61 18 26 29 15 92 49 02 96

79 50 40 09 64 79 64 71 60 10 17 68 34 69 86 98 31 86 86 99 02

61 29 12 30 48 53 38 99 06 03 03 78 72 52 83 28 98 24 11 81 01

94 93 56 40 01 32 63 87 78 89 28 88 39 63 92 43 58 63 86 91 32

55 13 51 86 82 09 73 03 21 40 28 88 51 90 05 76 63 89 21 78 95

Integrated Pest Management: Conducting Urban Rodent Surveys B-7
Table B-1. Random Numbers Table
 

59 30 34 80 22 39 68 50 45 44 11 15 49 09 54 15 19 25 57 83 29

72 55 35 70 89 13 79 70 90 11 29 20 42 97 45 15 91 25 99 13 20

74 15 71 81 18 15 84 52 79 54 15 64 74 11 00 38 99 15 17 92 41

50 23 93 75 28 92 46 62 43 42 96 72 50 51 74 17 67 09 60 11 57

86 84 52 97 48 64 91 15 69 68 33 06 21 93 58 69 67 18 15 77 96

70 92 34 92 53 59 40 06 71 59 44 22 14 07 02 21 50 21 78 82 19

88 41 24 18 02 88 34 52 86 82 20 12 06 35 94 87 62 49 17 53 55

40 31 97 57 91 17 73 05 52 94 79 66 29 58 80 42 91 23 98 25 98

36 32 71 68 34 64 89 19 65 42 98 23 75 48 57 99 16 42 89 14 78

93 73 23 81 08 32 47 73 11 80 42 95 84 68 43 79 55 05 33 38 81

01 94 84 52 80 41 19 90 09 67 18 40 18 65 33 16 48 26 28 81 18

18 28 77 96 71 77 90 00 32 36 00 56 74 09 70 94 95 89 28 87 61

30 35 89 31 92 47 68 36 06 66 18 11 02 37 58 76 51 63 89 33 15

62 49 19 21 36 21 50 36 06 11 26 40 06 52 84 64 79 61 35 59 24

44 01 55 27 32 74 12 83 40 09 08 99 10 47 94 82 24 06 54 28 66

16 19 48 62 67 10 64 63 80 38 97 47 90 11 09 92 53 43 80 39 36

01 76 52 94 85 81 05 05 11 34 68 51 59 50 16 38 98 37 18 16 22

05 33 06 84 63 80 46 53 62 48 50 26 35 78 85 89 22 00 70 98 40

26 85 77 81 17 79 49 03 95 97 54 04 39 53 59 43 77 89 21 90 03

77 90 00 99 01 80 23 92 37 53 33 21 71 71 68 41 42 69 64 90 05

54 00 97 51 75 25 38 98 35 50 40 02 13 26 77 87 70 92 42 92 49

13 06 92 51 90 10 93 65 51 79 63 98 25 97 46 89 17 90 09 50 34

67 25 31 86 86 80 23 59 40 09 13 52 73 11 75 26 70 92 37 64 77

98 35 50 16 49 22 13 34 84 54 28 98 27 31 90 01 51 91 27 19 24

19 95 89 15 97 47 97 49 14 76 70 95 82 25 64 75 44 32 20 10 59

30 08 47 79 56 72 43 72 47 97 43 58 75 41 63 78 91 20 09 93 58

62 60 12 70 94 94 95 84 69 62 47 72 39 73 08 32 41 62 72 53 59

42 66 03 38 70 85 88 44 32 38 70 99 01 81 08 44 10 86 98 20 66

21 94 96 73 28 86 98 23 94 94 82 18 44 19 93 67 20 02 17 69 60

11 85 82 14 91 13 28 86 87 64 87 64 92 34 76 68 43 56 59 50 49

01 62 57 87 75 50 36 35 58 84 58 55 37 34 47 92 44 15 43 53 43

65 44 20 29 32 42 84 59 30 40 25 85 96 70 92 52 79 71 72 31 85

94 96 67 15 65 42 69 79 51 59 52 77 90 10 59 50 41 33 35 56 64

90 01 07 77 83 31 94 91 25 53 34 74 16 20 55 11 51 65 35 63 81

00 32 24 06 33 16 32 73 13 79 57 89 15 88 41 31 76 70 85 97 55

12 07 45 45 24 19 70 87 68 53 68 33 11 65 57 80 45 41 22 54 08

30 20 04 75 41 20 61 13 50 48 56 60 05 46 50 43 69 69 84 55 28

95 92 44 12 71 78 88 40 02 70 88 50 17 75 31 92 36 08 35 58 61

24 38 99 15 16 32 69 84 53 46 69 66 20 58 86 98 35 86 86 80 27

31 97 57 83 31 59 52 91 27 14 68 49 14 82 19 71 64 86 93 57 89

22 18 17 44 04 20 11 48 52 80 41 58 77 83 35 62 51 82 10 20 29

38 92 37 59 22 15 56 58 66 16 08 90 10 66 27 11 60 08 94 89 14

75 40 03 57 96 70 89 27 12 80 28 91 20 18 06 21 71 61 34 55 39

37 16 03 01 82 07 28 95 83 47 97 52 82 20 31 88 39 71 62 70 88

43 42 77 79 68 54 16 04 76 62 67 16 21 95 98 26 64 87 74 03 62

51 61 12 23 89 20 52 89 23 92 43 64 67 11 17 60 00 49 06 74 14

67 26 20 48 30 12 22 52 85 80 24 07 96 65 31 81 09 70 86 90 09

93 63 98 33 03 36 13 39 75 33 05 98 35 46 77 85 86 80 22 22 39

Integrated Pest Management: Conducting Urban Rodent Surveys B-8