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A
"Mr.
did an excellent job. He listened to my information and concerns and then performed an excellent, thorough evaluation. He took time to" completely evaluate our home's foundation and was more than willing to answer any questions while he worked. He was not just interested in "getting in and out quickly". He took his time and did an outstanding job that gave me the information I needed in ordered to begin the bidding process for the needed repairs.
Seig carries my highest recommendation.

-Harold S.

A
"I initially saw some cracks in the wallboard of my laundry room. This is an exterior wall on my home so I went outside and sure enough I saw cracks in the mortar" and bricks that matched the cracks on the inside of the house. I contacted 3 companies to inspect my foundation and make suggestions for needed repairs. Their estimates and methods ranged from $10000 to over $30000 and each suggested a different solution. I decided to hire
& Associates to get a recommendation from an independent party.
arrived right on time and got to work examining inside the house, outside the house and inside the crawl space. He was here roughly an hour and gave me some information while he was here and indicated that I would receive a full written report within 24 hours. I received his detail report this morning and am extremely pleased with the completeness of it. He suggested that the ROOT CAUSE of my problem was excessive water around the foundation which allowed the soil that the foundation rests on to move and this movement caused the cracks I had seen. His suggestion for a first step was to install proper drainage and see if that by itself is sufficient to address the issue. His report did cover some of the steps that the original 3 people suggested as possible next steps but stated that the issues with the foundation are currently not severe or life-threatening and I can wait to see if the significantly cheaper drain tile installation is sufficient. I highly recommend that anyone receiving expensive quotes for foundation repairs contact
& Associates for an independant analysis.

-Lawrence C.

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Local Articles in Washington DC

Have a foundation crack? Consult a structural engineer

Are you worried about a crack in your home's foundation. A structural engineer can examine the crack and determine if your house is safe or hazardous to live in.

Structural Engineers

Your home's ability to withstand the forces of nature and gravity depend on good structural engineering. Building room additions, correcting foundations and repairing structural damage are all projects that call for a structural engineer's expertise.

Interior remodeling project, in progress.
Remodeling - General, Structural Engineering

Dear Angie: How much should it cost to remove a wall? We want to take out about 9.5 feet of a wall that runs from an exterior wall of the house to an interior wall. – Jenny H., Tampa, Florida

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earthquake retrofit
Remodeling - General, Structural Engineering

Earthquakes can strike out of nowhere and cause major damage to your home. Consider these tips to protect your home from earthquake damage.

bowed interior block foundation wall
Structural Engineering

Does your home have horizontal cracks in its concrete block foundation? Check out these common causes and repairs for horizontal foundation cracks from a highly rated structural engineer.

Angie's Answers

?

This can be maddening. Over the past 40+ years, in 4 houses, I have had or have run across this problem from gas meter leakage, water well pump column vibration, doorbell transformer, circulating pump, an extremely small (mist spray) water pipe leak, flourescent and sodium lights, security system horn dead battery, gas meter leaking slightly, bees in wall, bat colony, electric typewriter left on, stereo left on very low, and speaker inductive hum.

This seems to be a popular and recurrent question, so I am going to give the long answer for use by future questioners too.

I am assuming you do not hear this noise away from your house, or that other family members can hear it to. Obviously, if you hear it elsewhere also and other family members cannot hear it, then maybe you have tinninitus or are hearing your own high blood pressure blood flow (seriously). This commonly gets more acute at night when it is quiet, so all you are hearing is your internal ear sounds. I had this happen once because of a middle ear blockage - drove me crazy, getting up in the middle of the night because I thought I heard a water leak through the walls. Try putting on a pair of earmuffs or hearing protectors - if you still hear it or hear it louder, this is probably the case.

One method if hum is on the clearly audible side is make a 2 foot long cone out of paper to hold against your ear - like an antique hearing horn - then in each room face each of 4 directions while listening for where sound is the loudest, and turn your head to pinpoint the exact direction - I would spend 10 minutes doing this before getting into detailed stethoscope listening.

Otherwise, sounds like time for the old stethoscope (about $12 at a drug store - get a metal soundhead one, not cheap plastic, which does not pick up vibration as well). Also, if you are older (say over 35 or so) your hearing might have started to deteriorated with age, so if you have children or grandchildren with sharp hearing, they might be able to help track it down. I am sure a young child or grandchild, if you have one, would love this sort of treasure hunt (with appropriate "treasure" for a reward for tracking it down). 

Being careful not to come in contact with electricity with the stethoscope, check all the likely sources listed below. Start by placing it against pipes and walls and floor in each room of the house - water sourced noise goes a long ways, and tends to reverberate in the walls, so if that is the source likely to hear pretty easy. Hold stethoscope against bare pipes, both hot and cold, and heating system radiators or hot air vents.

If listening to water and hot water heating pipes indicates it is not water sourced, then you could turn off the master (outside) breaker or all the inside breakers and see if it goes away. I would only do this during above-freezing weather and early on a weekday, just in case a breaker fails to turn back on correctly when you switch it. Older master breakers particularly, which typically have never been used, sometimes break or fail to reclose properly after being shut off, so then have to be replaced. You want to be doing this at a time of day when, if necessary, you could get an electrician in the same day to replace it without paying weekend or nighttime emergency call rates.

If turning off the master breaker (or all other breakers) eliminates the hum, then turn them on one at a time until you find the one that turns the hum back on, then track where that circuit likely feeds (hopefully it is labelled) and check every switch, outlet, and light fixture.

Humming sources include (not in any particular order, a + in front means likely or common source of humming, - means rare or not likely):

1) + toilet fill valve - slightly leaking toilet inlet valve (listen where water tubing comes into toilet tank, and look inside tank to see if there is any water flow into or ripppling of the water in the tank or the bowl, or from the bowl filling tube (usually a small black plastic flexible tube which comes out of the fill valve (usually far left side of tank) and is clipped onto and discharges down into a hollow vertical brass or plastic tube or pipe in the toilet tank, which refills the toilet bowl after you flush)

2) + leaking faucet - kitchen, tub, shower, sink, utility tub, etc - it is amazing how just the smallest valve leak can make a hum or hiss that you can hear through the walls (especially at night), but only drips every few seconds.

3) - electric service meter dial motor

4) - electric breaker panel - rarely, a loose main power feed to a panel (especially with aluminum main service wire) will get loose enough that it vibrates back and forth and hums in its connector. A loose bus or snap-in breaker slot cover plate in the panel can also do this rarely

5) - gas meter or overpressure vent (unlikely, as you have had it replaced)

6) + boiling in the bottom of hot water heater or boiler because of buildup of lime, but would usually be intermittent - only when unit is heating

7) + furnace fan or electrostatic filter (forced air heat), or circulating pump (hot water baseboard heating), or steam condensate pump or overpressure venting (steam system).

8) - gas control valve or electric control box on a gas furnace, or its transformer (most have a 120V to 24, 16 or 12V transformer inside the front of the furnace

9) + air filter or electrostatic filter alarm on forced air furnace - some have a passive "whistle" opening that sounds softly when the filter is getting blocked, and if blocked with dust could make a hum rather than a whistle.

10) + Some water softener systems also have an "alarm" device to tell you it is time to service the unit, so check that if you have such a unit.

11) - a slightly leaking overpressure/overtemp valve on hot water heater or furnace (would be dripping)

12) - air venting from the air vents on hot water heating system. These will commonly make a hum or wheeze sound, for only for a few seconds at a time - not continuous unless leaking water

13) - city water system booster pump sound through the water column (if there is one near your home) - listen at the incoming water pipe - if much louder there than at other pipes within the house, that could be a house, though unlikely. If you think this could be it, find your water shutoff valve (typically 10' into your lawn from the street) and listen there. Would also be audible at neighbor's service pipe if that is the source.

14) - gas system compressor sound coming through gas pipe - listen to gas pipe outside the house and inside the house near furnace - if louder outside,, this could be a possible source, but the compressor or pressure reducer would have to be near your house. Would also be audible at neighbor's service pipe if that is the source.

15) + auxiliary booster circulating pump in your hot water or steam heating system (there may be one separate from the furnace, likely in the basement or a utility closet - most commonly found on  multi-unit apartment building with central heating and in 3 story or higher buildings, but you never know)

16) + a water leak, either inside or a leaking hose bib or pipe, or in your service pipe coming to the house

17) - electric on-demand water heater or electric-powered water filtration unit under the kitchen sink or inthe basement

18) + refrigerator compressor or fan hum

19) + doorbell transformer (front or back door - transformer is usually NOT at the doorbell, it is usually mounted in an open space like nailed to a basement joist, in an entry closet, or in the cubby space under the stairs - always physically near to the door, but NOT always on the same floor)

20) - any instant-on device like a TV

21) + any audio device (stereo, iPod, music player dock, computer, etc) that may have been left on at very low volume. Also, VERY rarely, if stereo or external speaker wires are run close to and parallel with an electric wire in the wall, they will acquire an  inductive voltage and hum.

22) + anything with a transformer, including stereo, add-on computer or iPod speakers, battery charger (rechargeable batteries or spare car battery or rider mower or boat battery charger), any portable electriconic device. Also portable device chargers (computer, iPod, cell phone, etc) - even if the device is not plugged into the transformer, as long as the transformer (charger) if plugged into an outlet, it is transforming high to low voltage, and transformers commonly hum

23) - electric typewriter left running

24) - electric ultrasonic cleaner or denture cleaner or electric toothbrush left on 

25) - home hair drying hood left on

26) - a lint buildup-jammed bathroom, kitchen, or attic fan. Many of these have, for safety, so called "self limiting" motors that if they jam just sit there and hum, but do not burn out.

27) - an attic cooling fan whose thermostat has failed, so is on all the time

28) - electronic furnace thermostat

29) + air conditioning unit, or aquxiliary air conditioner evaporator

30) + humidifier / dehumidifier - either permanently installed or portable

31) + portable heater / fan / air purifier

32) - automatic animal feeder waterer - either water supply or electric, as applicable

33) - dishwasher motor runningcontinuously - not shutting down after end of cycle

34) - convective or direct-vent oven or cooktop exhaust fan not shutting off

35) + flourescent (tube or CFL) or sodium or halogen light bulb / ballast hum (either inside, outside front door fixtures, or public street lights). These can hum quite pesistently when the starter circuit sticks on, or the bulb is dying and will not start (light completely), so the started circuit tries continually to start the lamp - can make a hum audible up to a block away on street lights.

36) - a dying electronic photocell designed to turn on your outside lights

37) - home security system, especially its alarm or horn. If the alarm is sounding but for some reason the main power is not getting to it, then as the battery goes dead (or if full voltage is not getting to it) is can give off a squeek, hum, or rasping sound - ditto if insects like wasps or hornets build a nest in it, so it cannot sound correctly.

38) + well pump, pressure tank, or filtration system, if you are on a well

39) + insect or bat nest in the attic or walls or in outside bins or cupboards, electric panel/meter, or outside telephone connection box (bees /wasps / hornets most likely) - though this usually varies by time of day, although it would "pulse" at the time of day when they are waking up or going to sleep.

40) + carpenter ants or termites - their continuous chewing of the wood can sound like a hum till you get right up against the colony, then you can actually hear the chewing

41) - a regional hum, as has been occurring at times in Ohio, Wisconsin, and Arkansas - where micro-seismic activity causes a hum or booming sound. Google or call your local paper and see if anyone has been reporting this in your area.

42) + outdoor power service transformer - either a metal (typically army green or gray) about 1 foot diameter "can" mounted on a power pole if you have overhead service, or a 2-3 foot cubic metal box on the ground or in a manhole pit near the street if you have underground service, which usually serves 4-6 houses (so may be in a neighbor's yard) and will have a voltage rating marked on it, usually in yellow stick-on lettering - like 4160V - 220V. Usually has high voltage - keep away safety markings on it.

43) - you have found where the Caddyshack gopher (who hummed to himself) moved to after Bill Murray blew up his happy home at the golf course.

Hope this list helps you (and future users with the same question).

?

There is NO such thing as an average cost !

 

You are going to be required to have a building permit and the Building Comissioner

or Senior Permit Official of your local permit office will issue a determination as to whether you will be required to have a Steel Bearing Beam , a Laminated Bearing Beam or some other Beam to support weight of the structure you want to ammend . You  may also be required to install Bearing support posts footings,  at either end of the beam as well. Much will depend as to what is over  and under the space that you wish to span .The official may require you to retain an Architectual Engineer to perform a Load study and computations and require you to  comply with his recomendations .

 

 Until you know what is required by the Permitting Office , Then and only then will you be able to determine the true costs .

 

The fact that you have existing baseboard heat , and we know NOT if it is electric or radiant baseboard heat will complicate the issue as well the existing electrical outlets which may need to be sunken into the floor in order to maintain the electrical circuitry as it exists.

 

 Past experience in these matters , indicate possible costs to range from  $4000.00 to  as much as  $8k -$10,000.00 . I realise that these cost ranges are probably NOT what you want or expect , but There are too many unknowns to attempt a closer cost expectation or range of expenses !

?

Hi, this is Meranda with Angie's List.

 

You can log in at www.angieslist.com and search for "structural engineer" to find someone in your area who can independently assess the situation. They should be able to determine if this is a serious problem or a cosmetic problem, and if it's an issue make a recommendation/plan to fix it.

 

While your mileage may vary, I had a similar situation in my own home this spring. We noticed several new drywall cracks that appeared to be developinfg or growing around our 20-year-old home. We hired a structural engineer — $300 for an assessment — and he concluded the home was structurally sound, and the cracks likely were just settling and seemed to appear one after another because the crazy weather and humidity changes over the winter. It was worth that price to sleep better at night not worried my home was falling down. He recommended we find a drywall guy to fix it — way cheaper than the scenarios I'd been imagining in my head.

 

If you need help finding someone, you can also always email or call in a request for our member services team at memberservices@angieslist.com or 1-888-944-5478 on weekdays from 8:30 a.m. to 8:15 p.m. and Saturday from 8:30 a.m. to 3 p.m. Eastern time.

 

Good luck!

?

Architect first - for around $1000 typically you will get site consultation, a few sketches showing what you said you wanted, and a preliminary (by the book) cost estimate - that you can use to figure if your budget or scope of work needs major adjustment. Then, if you go ahead, typically about 10-20% of total project cost for complete plans and specs (including above cost), depending on complexity and level of interior design detail, and if construction inspection services are included.

 


 
 
Generally, nothing is free with an architect - unlike a contractor where a bit of consultation and a rough estimate is a lead-in to the actual work he hopes to get (the construction/repair) and part of his bidding cost, an architect (and engineer) makes his living giving advice and consultation and developing designs and cost estimates - so giving it away for free is sort of like a dentist doing sample fillings for free. Some will come to your house to discuss your concepts for 15-20 minutes for free, basically to see if they want to take you on as a client or feel your job is the type or size they want, but you should expect little or nothing in the way of a design or cost estimate for free - the most you might get would be an opinion on whether it sounds, off the cuff, like your budget is roughly in line with your desired scope of the project.
 
 
On more complex or up-scale remodels, it is not unusual to contact several architecture firms and request proposals - where they basically come see the site, then give you a sketch or few or more common today, computer-generated altered photos of your place, showing conceptually what they can do for you, then you choose the one you like the most and go with that one for final design. Typically $500-1000 range fee (each) to get that done for small jobs, larger jobs will typically be no charge but that assumes probably $25-50,000 plus anticipated fees if they get the job.
 
 
Bear in mind in the latter scenario you cannot pick and choose betweenthe best parts of each proposal - the architect owns the design and it is copyrighted, so while you can choose bui9lding elements (dormers, bay windows, etc) from any of the proposals, specific design or color combinations are copyrighted by the proposer.
The Search the List category is Architects and Building Design.
?
Here is a link to a recent diagnosis exercise I just went through on another similar question - might be of some interest to you, though that case is likely duct related whereas your I think may be outside - http://answers.angieslist.com/What-causing-loud-banging-clicking-noise-q141018.aspx In your case however, and especially with the only on very cold night issue and especially more early in winter, my first, second and probably third guess would be the deck. Baseboard heating pipes commonly creak, pop, and sometimes squeek as they expand and contract, but unless the pipes are jamming up where they come out of the floor so they make the baseboard radiator "pop", they usually do not "bang" like steam pipes do. And would sound like someone accidentally kicking the baseboard like a minor clang or thump - and typically quite metallic sounding in that case. The jut out on the house could make the noiseif it is heating and cooling signifiantly, but with constant heat in the house I would doubt it - that noise can occur on occasion due to siding being installed without adequate expansion gaps at the ends of boards or edges of panels. Usually if that is the problem, though, you will get bulging or end-cracking or splitting of the siding oer time. Plus of course the expansion and noise occurs in HOT conditions (usually direct sunlight on hot days), not in the cold of winter. Deck, especially in early winter as they initially freeze and the moisture content in the boards is typically high, tend to thump quite hard as they freeze - commonly sounds about like someone jumping up high and landing hard on the deck in boots, or maybe like someone hitting the far end of the house with a sledgehammer. Not uncommon to actually feel the thump while in your bed. What is happening can be one of several things: 1) most commonly, moisture in the boards is freezing causing expansion - till eventually the board(s) pop a nail, or break free of the frost holding them to the support boards. They freeze at the joists first because that is where the free water is and is accessible to the air all around so it freezes hard first, then as hard freezing conditions persist through the night the water in the boards themselves expands, causing the board to eventually break the ice bond - or in extreme cases to push hard enough against the end of the next board to break it free. This commonly happens from a couple to around 4-6 hours after evening hard freeze sets in, so commonly about midnightish as opposed to early evening or early AM, in normal daily temperature fluctuation conditions. This can easily happen to several boards in one night, and if thawing in the daytime, or especially if getting rained on or getting snow meltwater again, can become more frequent for awhile then taper off a few days to a week or so later. 2) decks are basically built as a single unit without specific expansion provision, but are semi-rigidly fastened in place by the piers and commonly rigidly fastened along the house edge - so any expansion or contraction creates stresses in the deck which eventually can get strong enough to cause popping and creaking and thumping noises. Because it is rigidly constructed, the stresses (from moisture or freezing or on large decks even just daily thermal changes) can accumulate fairly well before something releases, so the thump or bang can be quite loud. 3) if your support posts (on decks with outer edge support piers/posts and fastened to the house with a ledger board) are frost heaving, then they lift the deck upwards at the outer edge, which can cause sounds from nails prying out of the house as the ledger board tilts up - or in extreme cases ripping out of lag bolts or joist hangers. Check to be sure your ledger board is not tilting away form the house at the bottom, and that the deck is not tilting up significantly at the outer edge. 4) sometimes the freezing water in the deck boards can cause splitting of the board, which makes a tearing or ripping sound usually, rather than a thump. 5) occasionally, frost heave in the ground under the stairs can lift the stairs, causing tearing or ripping where it is fastened to the deck. While disturbing, this sort of noise (in moderation) does not normally "damage" a deck, though of course it does cause a general loosening up of fasteners over time, and sometimes snaps deck nails or screws (screws more often because they are generally higher stress steel, so can't yield as much before snapping). Of course, significant frost heaving does need to be taken care of - by solving the cause (footings bearing on/in frost heave susceptible soil) or by releveling the deck periodically if a slow, gradual year-by-year heaving of the foundations. Measures to take - just visually inspect the deck and alll support posts and connections periodically (every year or two) for broken or loose ones, but generally unless deck board fasteners break, you will not see anything except maybe a few nail heads sticking up. And check it with a level to be sure the outer edge is not lifting up due to frost heaving of the piers, and adjust back level (hopefully you have adjustable piers/posts).
?

Structural Engineering reviews in Washington DC

A

Rating
I was considering starting a major renovation of my house and wanted to make sure that there were no foundation problems before proceeding. Mr.
Washington DC Structural Engineers Provider Name Locked
(a licensed engineer) was thorough, knowledgable, prompt, and very methodical. He provided me with documentation, including a site plan, after returning to his office to prepare his final report. I was very impressed and pleased with his professionalism.
- Stephen W.
A

Rating
I called Bill after finding him on Angie's List. It just so happens that he came highly recommended from a home inspector that I use as well. (I'm a real estate broker)
During the initial home inspection, the inspector noted that there seemed to be some moisture in the walls of the basement, although no moisture was present in the basement itself. Having never lived in a home with a basement, my clients were concerned that the water had affected the structural integrity of the home and wanted to have it inspected further before moving forward with their purchase.
I called Bill and left him a message. He called back right away and was able to schedule an appointment for that weekend. He arrived at the appointment on time and we went straight down to the basement to check things out. During this inspection he was able to calm my clients fears, informing them that there was in fact water present in the foundation but at this time no structural damage had occurred. He did say that if nothing was done to correct the cause, over time it may become an issue.
He offered a number of solutions to rectify the cause of the water after they purchased the house, many of which would not be costly to my clients.
Bill was very nice and informative. The inspection was a little costly, at $400 or so for about a half an hour of time, and if my clients wanted a written report, the cost would have been $650. That being said, money is not a factor when it comes to peace of mind and Bill is really good at what he does.
- ASHLEY D.
A

Rating
FANTASTIC!
Washington DC Structural Engineers Provider Name Locked
was able to provide a solution to our structural problem, while being responsive and professional. Due to the nature of the real estate transaction, we had to work with urgency.
Washington DC Structural Engineers Provider Name Locked
not only made room on his calendar for us, but he delivered our report 2 days before he promised delivery. I would absolutely recommend him to anyone.
- Stacy M.
A

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Mr.
Washington DC Structural Engineers Provider Name Locked
was punctual, considerate, professional and thorough in his inspection of the property. He provided in a timely fashion a written in depth report of his findings along with recommendations for resolving the issues that were found. I could not have been more pleased.
- Diana S.
A

Rating
Washington DC Structural Engineers Provider Name Locked
from
Washington DC Structural Engineers Provider Name Locked
evaluated several structural issues that came to light during a home inspection on a home we had made an offer. He is very personable and explained his findings in easy
Washington DC Structural Engineers Provider Name Locked
's terms. I had been concerned that an engineer might come up with esoteric solutions but it was just the opposite with
Washington DC Structural Engineers Provider Name Locked
, he is very practical in his approach to the issues and solutions for the concerns we had especially some foundation issues. The irony was that our Realtor who had to be present since the sellers were not home had previously discouraged us from getting an engineer as he said in his experience engineers made
Washington DC Structural Engineers Provider Name Locked
things complicated later told us from the conversations he heard me having with
Washington DC Structural Engineers Provider Name Locked
and what I told him about the inspection "that guy was really good he was laid back and was giving you real life, practical advice."
- donna L.
A

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Washington DC Structural Engineers Provider Name Locked
was prompt, attentive, professional and willing to explain in detail the issues we were facing. His report was thorough. We are happy with his service and will use his services in the future.
- Diana M.
A

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The engineer was extremely knowledgeable. Told me facts about the house that were truly exciting. For example it was built about 70-80 years earlier than listed on the
Washington DC Structural Engineers Provider Name Locked
. He told a story about the brick wall. Every little detail was accounted. The best!
- MATTHEW B.
A

Rating
Luyi from
Washington DC Structural Engineers Provider Name Locked
& Associates is a professional engineer who knows the code and knows the calculations--and best of all, he's not one of those sales people that other companies send out. He had no fancy equipment, just a level, measuring tape and vast knowledge of structures. He was so nice and explained what he was looking for and what he did and didn't find. And best of all, he determined that my house doesn't need repair work, but I would have trusted him if it did. I will recommend
Washington DC Structural Engineers Provider Name Locked
& Associates to anyone needing a structural inspection or design work.
- Ryan J.

Structural Engineers in Washington DC

Companies below are listed in alphabetical order. To view top rated service providers along with reviews and ratings, Join Angie's List Now!

1

Washington

3 D STRUCTURAL ENGINEERS INC

211 BRISTOL DOWNS DR

A J ENGINEER

4304 EVERGREEN LN

A M BUILDING

1500 WILSON BLVD

A&I design homes

10282 arizona cir

A&I Design Homes

42918 Tippman Place

ABC SYSTEMS ENGINEERING

211 N Union St Ste 240

ABM

843 QUINCE ORCHARD BLVD

ABM ENGINEERING

938 N LIBERTY ST

ACE SYSTEMS TECHNOLOGIES

6315 BACKLICK RD

ACUMEN

1423 CANDLEWOOD ST

Acute building construction, llc

2017 Vermont Ave NW
Washington

ADAPTIVE METHODS INC

15825 SHADY GROVE RD

ADG Contractor

3120 Collie Lane

ADTEK ENGINEERS INC

97 MONOCACY BLVD

ADTEK ENGINEERS INC

97 Monocacy Blvd Ste H

ADTEK ENGINEERS INC

9990 Fairfax Blvd Ste 300

ADVANCED TECHNOLOGIES & LABS

8146 BEECHCRAFT AVE

AE

9900 MAIN ST

AEA TECHNOLOGY

560 HERNDON PKWY

AEC INC

8551 SUDLEY RD

AIR CONTROL SYSTEMS

8487 EUCLID AVE

AIR TECH INTL CORP

4112 TULARE DR

AIS ENGINEERING INC

804 Pershing Dr Ste 208

AKF ENGINEERS

1655 Fort Myer Dr Ste 200

ALCOHOL & DRUG TESTING SVC

14142 MINNIEVILLE RD

ALLBRITE CCS INC

12001 QUARUM PL

ALLGAIER MENDEHALL SMITH

5300 WESTVIEW DR

ALPHA INTERNATIONAL

5335 WISCONSIN AVE NW
Washington

ALUTIIQ SECURITY & TECHNOLOGY

23330 COTTONWOOD PKWY

Alvin Sacks Inc

6022 ONONDAGA RD

AMEC EARTH & ENVIRONMENTAL

8326 Diamond Hill Rd

AMEND GROUP

22020 UUNET DR

AMERICAN CONTRACTING & ENVIRON

12075 DOUG BROOKS RD

AMERICAN WOODMARK CORP

430 JACK ENDERS BLVD

AMLICKE ENGINEERING SVC INTL

3 BETHESDA METRO CTR

ANCO ENGINEERING

4800 INDIAN LN

Anco Engineering

8700 Rosaryville Rd

ANTI ENTROPICS INC

10157 VANTAGE POINT CT

APAC ENGINEERING INC

2110 SEMINARY RD

APEX ENVIRONMENTAL INC

15850 CRABBS BRANCH WAY

APPLIED PROTEOMICS

18231 FLOWER HILL WAY

APS COGENEX

5235 WESTVIEW DR

Aquaguard Waterproofing

6820 Distribution Dr.

ARGON ST

8419 TERMINAL RD

ARMY CORPS OF ENGINEERS

131 NATIONAL BUSINESS PRKWY

ARTIFAX

7202 45TH ST

AS and R Consultants

2465 Centreville Rd

AS&R Consultants, LLC

2465 Centreville Road

ASEA BROWN BOVERI INC

1455 PENNSYLVANIA AVE NW 1130
Washington

ASME WASHINGTON HOT LINE

1828 L ST NW
Washington

ATA ENGINEERING

13838 JEFFERSON PARK DR

ATCS PLC

7 POST OFFICE RD

AVAILINK

20201 CENTURY BLVD

AYS Engineers - Alex Sallah

8837 Western Hemlock Way

B.K. Services

504 kibler circle

B2E CONSULTING

116 EDWARDS FERRY RD NE

BABINGTON INC

1320 OLD CHAIN BRIDGE RD

BACKMINE ENGINEERING LLC

11800 BRISTOLWOOD TER

BAE SYSTEMS

9300 WELLINGTON RD

BAE SYSTEMS

5113 LEESBURG PIKE

BAE SYSTEMS

4301 CONNECTICUT AVE NW
Washington

BAE SYSTEMS

80 M ST SE
Washington

BAE SYSTEMS INC

1601 RESEARCH BLVD

Bair Group LLC

11160 C1 South Lakes Dr

Barratt Construction

PO Box 60463
Washington

Basement Detective

3310 Clayborne Ave

BASEMENT UNLIMITED

1430 Galena Rd

BECHTEL CORP

1015 15TH ST NW
Washington

BECHTEL NATIONAL INC

5275 Westview Dr

BEI STRUCTURAL ENGINEERS

3930 Pender Dr Ste 175

BEM SYSTEMS INC

4151 CHAIN BRIDGE RD

BETTER ENGINEERING SVC

2 PIDGEON HILL DR

BICENTENNIAL BUILDING

600 E ST NW
Washington

BIGONEY ENGINEERING

612 LAFAYETTE BLVD

Billings Construction Inc

14725 Baltimore Ave

BIOFACTURA INC

9700 GREAT SENECA HWY 165

BLAKE DEVELOPMENT CO

1025 CONNECTICUT AVE NW
Washington

BLS ENGINEERING

22648 GLENN DR

BMT DESIGNERS & PLANNERS INC

2120 WASHINGTON BLVD

BOHLER ENGINEERING

16900 SCIENCE DR

BOHLER ENGINEERING

28 Blackwell Park Ln Ste 201

BOWMAN ENVIRONMENTAL LLC

3863 CENTERVIEW DR

Brad4Cad LLC

5657 Utrecht Rd

BRANDES & CASSAGNOL ENGINEERS

5520 Connecticut Ave NW Ste LL4
Washington

BURNS & ROE

1400 K ST NW
Washington

C.C.I llc

3804 Perry St.

CACI INC

300 M ST NE
Washington

CAGLEY & ASSOC

6141 EXECUTIVE BLVD

CAMPBELL & PARIS ENGINEERS

4215 LAFAYETTE CENTER DR 2

CANAL SQUARE ASSOC

1054 31ST ST NW
Washington

CAPGEMINI GOVERNMENT SOLUTIONS

1900 Campus Commons Dr Ste 250

CAPITOL ENGINEERS

15433 WEMBROUGH ST

CARLOS DELTORO

2 BRITTANY LN

CASCADES WEST ENGINEERING

12005 SUNRISE VALLEY DR

CASEY MANAGEMENT

16803 Crabbs Branch Way

CATES ENGINEERING

13575 Heathcote Blvd Ste 170

CDM

3201 Jermantown Rd Ste 400

CDT BIO SOIL SYSTEMS

206 E MOUNT HARMONY RD

CERADYNE INC

1776 K ST NW
Washington

CGW TECHNOLOGIES INC

22337 GREENVIEW PKWY

CHARLES FORD & ASSOC

4326 GEORGIA AVE NW
Washington

CHC ENGINEERING LLC

5272 Meadow Estates Dr

CHD ASSOC LTD

4625 TARPON LN

Chryst Brothers Construction

6450 Old Dominion Dr

CID Engineering

1426 Montague St NW
Washington

CMS

5720 ROCKSBURY LN

CNA STRUCTURAL ENGINEERS

7926 JONES BRANCH DR

COAKER & CO PC

11675 CAPTAIN RHETT LN

COLEMAN RESEARCH CORP

15049 CONFERENCE CENTER DR

COMBUSTIONEER CORP

320 23RD ST S

CONSOLIDATED ENGINEERING

930 H ST NW
Washington

CONSOLIDATED ENGINEERING

1300 PENNSYLVANIA AVE NW
Washington

CONSOLIDATED ENGINEERING LLC

3014 MITCHELLVILLE RD

ConstruXure

5252 Cherokee Ave

CONSULTING ENGINEERS CORP

11480 SUNSET HILLS RD

COSMOS ENGINEERS

10411 Motor City Dr Ste 700

CREATIVE ENGINEERS INC

16125 MALCOLM DR

CRITCHFIELD STRUCTURAL

2926 SUMMERFIELD RD

CROUSE ENGINEERING INC

3215 LEONARDTOWN RD

CSI ENGINEERING DCPC

9111 EDMONSTON RD

CTI CONSULTANTS INC

130 IMBODEN DR

CTSI INC

46655 EXPEDITION DR

Custom Home Elements

11951 Freedom Dr

CUTTS & ASSOC

2000 L ST NW
Washington

DANAC CORP

18775 N FREDERICK AVE

DANIEL ENGINEERING

2202 HINDLE LN

DANTER ENGINEERING

321 OLNEY SANDY SPRING RD

DAVID C MESHEL

4656 THORNHURST DR

DAVID VOLKERT & ASSOC ENGNRNG

5028 WISCONSIN AVE NW
Washington

DAVID W CODER

6007 BENALDER DR

DAY & ZIMMERMANN NPS

1827 Freedom Rd Ste 101

DELON HAMPTON & ASSOC

8403 COLESVILLE RD

DENSIFICATION INC

40650 HURLEY LN

DIGITAL GLOBAL STRATEGIES LLC

PO Box 34243
Washington

DKM RESEARCH

3887 ALDIE RD

DOMINION ENGINEER ASSOC

8511 Indian Hills Ct Ste 202

DONJON SMITLLC

635 SLATERS LN

DOYLE

101 N ADAMS ST

DOYLE

5 N FREDERICK AVE

DOYLE

15837 CRABBS BRANCH WAY

DRH Engineers, PLC

9 N 3rd St Ste 209

DYNAMAC CORP

1901 Research Blvd Ste 220

E J CONSTRUCTION ENGINEERING

43821 Laurel Ridge Dr

E M FEDERAL ENGINEERING CORP

1212 NEW YORK AVE NW
Washington

E M TECH

9116 51ST PL

EAD TEST & SVC

1910 ASSOCIATION DR

ECM2 ENGINEERS

16840 OAKMONT AVE

ECODIT INC

1800 N KENT ST

ECOSYSTEM SURVEYS & ENGNRNG

1025 CONNECTICUT AVE NW
Washington

ECS CORPORATE SVC LLC

14026 THUNDERBOLT PL

EDENSPACE SYSTEMS CORP

3800 CONCORDE PKWY

EDG2 INC

10411 Motor City Dr Ste 302

Edge Energy

6854 Distribution Dr

EG & G

46591 EXPEDITION DR

EG & G

9639 DOCTOR PERRY RD

EHLERT BRYAN INC

1451 DOLLEY MADISON BLVD 220

EHS SVC INC

144 HIGH ST

ELECTRIC BOAT CORP

2341 JEFFERSON DAVIS HWY

Elevator Technologies Inc

7931 Penn Randall Place Unit D-1

ELITE KITCHENS

12115 PARKLAWN DR

ELMA ANALYSIS GROUP & ENGR SVC

325 PENNSYLVANIA AVE SE
Washington

ELMCO INC

2001 JEFFERSON DAVIS HWY

Elmech Industrial Services

4120 Lakewood Manor

EMC 2 ENGINEERS

16840 OAKMONT AVE

EMCOR Engineering

2800 Crystal Drive

EMCOR FACILITIES SVC

4020 ARLINGTON BLVD

EMCOR FACILITIES SVC

2201 C ST NW
Washington

EMCOR FACILITIES SVC

301 13TH ST SE
Washington

EMCS LLC HERB EMERSON

14200 WAYNESFORD DR

EMERSOL TECHNOLOGIES INC

2722 MERRILEE DR

EMP CONSULTANTS

10 TRIPLE CROWN CT

EMPIRE ENGINEERING ASSOC

325 PENNSYLVANIA AVE SE
Washington

ENERTECH

20693 RAINSBORO DR

ENGINEERING & MANAGEMENT

6462 LITTLE RIVER TPKE

ENGINEERING & MATERIAL TECH

7857 COPPERMINE DR

ENGINEERING ENVIRONMENTAL MGMT

2600 Park Tower Dr Ste 100

ENGINEERING MANAGEMENT

15 LIVERSEDGE DR

ENGINEERING SCIENCE INC

1133 15TH ST NW
Washington

ENGINEERS & SURVEYORS INST

4460 BROOKFIELD CORPORATE DR

ENVIRONMENTAL MANAGEMENT

8601 GEORGIA AVE

ERA CORPORATION

1881 CAMPUS COMMONS DR

ESTA CONSULTANTS

4455 CONNECTICUT AVE NW
Washington

ETAK

15200 SHADY GROVE RD

EXCEL SERVICES CORP

11921 ROCKVILLE PIKE

FAIRFAX MORTGAGE

10210 Norton Rd

FERNANDEZ ASSOCIATES

101 PARK WASHINGTON CT

FLIGHT EXPLORER

7925 JONES BRANCH DR

FMA CONSULTING INC

3062 QUEENSBERRY DR

FOUNDATION SYSTEMS

15200 SHADY GROVE RD

Franklin Construction LLC

10377 Green Holly Ter

FREEMIRE & ASSOCIATES INC

1215 OLD DORSEY RD

FUTRON CORP

7315 Wisconsin Ave Ste 400E

G & L AUTOMOTIVE

8012 Railroad St

GEARLOOSE ENGINEERING LLC

14528 SOLOMONS ISLAND RD S

General Remodeling Group

11722 Newbridge Crt, Reston, Virginia 20191

GENERAL SCIENTIFIC CORP

22685 THREE NOTCH RD

GENESIS ENGINEERING CORP

9811 GREENBELT RD

GEO CONCEPTS

19955 HIGHLAND VISTA DR

GEOFREEZE

3045 COLVIN STREET

GEORGE G SHARP INC

635 SLATERS LN

GEORGE NORTON CNSLTNG ENGNR

10319 westlake drive

GEOTECH ENGINEERS INC

11890 OLD BALTIMORE PIKE U

GEOTECHNICAL & MATRIALS ENGINE

14705 GENERAL LEE DR

GEOTECHNICAL CONSULTING

4899 PRINCE WILLIAM PKWY

GIBBS & COX

80 M ST SE
Washington

Glickman Design Build

14516 Pebblewood Dr

GLOBAL CONSULTING INC

1818 NEW YORK AVE NE
Washington

GLOBAL ENGINEERING SOLUTIONS

1355 Piccard Dr Ste 260

GLOBAL SCIENCE & TECHNOLOGIES

500 E ST SW
Washington

GLOWPOINT TECHNOLOGIES

21715 FILIGREE CT

GMZ Architects

5830 Bethel Rd

GOE ENV ENGINEERS

10875 MAIN ST

GOLDBELT ORCA

7051 MUIRKIRK MEADOWS DR A

GORDON ASSOCIATES

44084 RIVERSIDE PKWY

GRACE TERPSTRA & ASSOC

1800 M ST NW
Washington

GRADE LINE ENGINEERING

300 Midsummer Dr

GRANDESIGN STUDIO

912 THAYER AVE

Greene Home Services, LLC

13208 Ardennes Ave

GREENFIELDS CO INC

307 CIRCLE AVE

GREENMAN-PEDERSEN

700 WESTWOOD OFFICE PARK

GS ENGINEERING INC

47500 US Highway 41

GUTSCHICK LITTLE & WEBER PA

BURTONSVILLE OFFICE PARK

HAYNES WHALEY ASSOC

1881 CAMPUS COMMONS DR

Helicon Works

2901 18th St NW
Washington

HESSLER ASSOCIATES INC

3862 CLIFTON MANOR PL

HILLIS CARNES ENGINEERING

3641 LEONARDTOWN RD

HILLIS CARNES ENGINEERING

4959 NEW DESIGN RD

HILLIS-CARNES ENGINEERING

14155 SULLYFIELD CIR

HOLBERT APPLE ASSOC INC

3423 OLNEY LAYTONSVILLE RD

Hollco Construction, Inc.

8060 Sleepy View Lane

Home Contractors Plus

8402 Quill Point Dr

HONEYWELL

3100 KAVERTON RD

HORNE ENGINEERING SVC LLC

3975 University Dr Ste 100

HYAK LABORATORIES INC

849 NW State Road 45

I ENGINEERING CORP

24805 Pinebrook Rd Ste 204

I S ENTERPRISES

1324 H STREET NE
Washington

Ibex Engineering

4411 Phylliss St

INCINERATOR CONSULTANTS INC

20755 CRESCENT POINTE PL

INDEPENDENT CONSULTANTS

15861 COMMERCE CT

INFRA-STRUCTURES INC

2611 JEFFERSON DAVIS HWY

Insulators Home Exteriors

15430 D Old Columbia Pike

INTEGRATED ENVIRONMENTAL

975 Russell Ave Ste A

INTEGRATED SYSTEMS ANALYSTS

2001 N BEAUREGARD ST

ITHLUSA

20410 CENTURY BLVD

J S LEE ASSOC INC

451 HUNGERFORD DR

JACOBS ENGINEERING GROUP INC

19710 JANELIA FARM BLVD

JAMES M GROSS INC

218 HIGHLAND AVE

JES Foundation Repair

1741 Corporate Landing Parkway

JEV CONTRACTORS & DESIGN SERVICES

2016 North Troy Street

JHI Contracting

808 K St. NE
Washington

JOHN G CASANA

4631 LESCOT PL

JOHNS & BHATIA ENGINEERING LTD

7979 OLD GEORGETOWN RD

JOHNSON ENGINEERING ASSOC

14710 SPRING MEADOWS DR

JP General Construction

10112 Carlington Valley Ct

K C ENGINEERING

4502 GARRETT AVE

KAJAX ENGINEERING INC

4600 FAIRFAX DR

Kamran Ohi P E

1025 Jefferson St NW

KASEMAN LLC

1600 Tysons Blvd Ste 1400

KCE STRUCTURAL ENGINEERS

1818 JEFFERSON PL NW
Washington

KELLY ENGINEERING

6317 NAVAL AVE

Kemp Home Inspections, LLC

13017 Wisteria Dr. #410

KIHOMAC

6153 FULLER CT

KLEIN ENGINEERING

16806 CHESTNUT ST

KTA GROUP INC

1707 L ST NW
Washington

L I IDENTITY SOLUTIONS

1235 S CLARK ST

LACHEL FELICE & ASSOC

2230 GALLOWS RD

LAMUS CO

11350 Random Hills Rd Ste 883

LAND & COMPASS

3195 Old Washington Rd

Larkin Remodelers LLC

10627 Jones St

LAW ENGR & ENVRMT

7855 WALKER DR

LAWRIE & ASSOC

6202 OLD FRANCONIA RD

LEEDY ASSOC INC

15720 COMUS RD

LEGIN GROUP

901 RUSSELL AVE

LEGIN GROUP INC

PO Box 3788

LEGION DESIGN-CAMPBELL & ASSOC

4301 Connecticut Ave NW Ste 240
Washington

LENKIN ENTERPRISE INC

7887 BRADLEY BLVD

LEROY T GRAVATTE III PE

6177 GROVEDALE CT

LEUTERIO THOMAS LTD

10601 CANNONVIEW CT

Levelift Foundations LLC

10370 Baltimore National Pike

LEWIS ENGINEERING ASSOC

28841 RIVERWATCH DR

LINTON ENGINEERING LLC

46090 Lake Center Plz Ste 309

LIZ ROBBINS ASSOC

101 Constitution Ave NW Ste 800W
Washington

LLM ENGINEERING PLLC

42996 BROOKTON WAY

Lofft Construction Inc

616 Kennedy St NW
Washington

LOHNES & CULVER

14008 Crest Hill Ln

Louis & Associates LLC

9436 Wooded Glen Ave

LOW IMPACT DEVELOPMENT CTR

5000 Sunnyside Ave Ste 100

LSA INC

1901 FORT MYER DR

LTI-LIMNO-TECH INC

1705 DESALES ST NW
Washington

LTM INC

9161 Liberia Ave Ste 300

M CAPITOL MANAGEMENT

2055 L ST NW
Washington

M LUCIUS WALKER JR

2650 Quarry Lake Dr Ste 120

m2 BUILDING AND DESIGN

7407 ALBERMARLE DR

MAC CORP

6799 KENNEDY RD

MACAULEY- BROWN

5608 SOUTHPOINT CENTRE BL 100

MAN TECH SYSTEMS ENGINEERING

46610 EXPEDITION DR

MAN TECH SYSTEMS ENGINEERING

12015 LEE JACKSON MEMORIAL HWY

MAR INC

1803 RESEARCH BLVD

MARINE ACOUSTICS INC

4350 Fairfax Dr Ste 600

MARITIME DYNAMICS INC

21001 GREAT MILLS RD

MARY JOSEPH ASSOC

20819 TALL FOREST DR

MASSIVE ENGINEERING SVC

411 HAMILTON ST
Washington

Master Wall Rocks Inc.

740r 18TH AVENUE

MAVEN ENGINEERING CORP

95 MONOCACY BLVD

MC LEAN SYSTEMS ENGINEERING

8200 GREENSBORO DR

MC MULLAN & ASSOC

8381 OLD COURTHOUSE RD

MCQ ASSOCIATES INC

1551 FORBES ST

MEAD & HUNT INC

1655 FORT MYER DR

MEDICAL PLAZA TWO

9711 MEDICAL CENTER DR

MEGA ENGINEERING

10701 Harper Ave

MEI TECHNOLOGIES

7404 EXECUTIVE PL

MEP DESIGNS INC

8721 PLANTATION LN

MEP ENGINEERS

2217 PRINCESS ANNE ST

MERGANSER AIRCRAFT

4 BINNACLE LN

MESEN ASSOCIATES PC

8346 TRAFORD LN

Metal Supermarkets

7120 Golden Ring Road

METRIX ENGINEERING & CONTR INC

6480 NEW HAMPSHIRE AVE

MGV CONSULTING STRUCTURAL

6239 Executive Blvd

MICRO CLEAR INTL LLC

6200 PLAINVIEW RD

MIL CORP

22188 THREE NOTCH RD

MILLENNIUM ENGINEERING

2231 CRYSTAL DR

Mr Basement

832 Oregon Ave Ste H

MULLANEY ENGINEERING INC

4937 Green Valley Rd # 45

MWH AMERICA'S INC

1155 21ST ST NW
Washington

MY GLASSMAN LLC

PO BOX 150

MZDC Builders, LLC

6100 Cheshire Dr

NAL RESEARCH CORP

9385 Discovery Blvd # 3

NATIONAL EVALUATION SVC

5203 LEESBURG PIKE

NATIONAL SYSTEMS MANAGEMENT

1749 Old Meadow Rd Ste 130

NOA CONSULTING GROUP LLC

23110 YELLOWWOOD DR

Noel Design Build

3224 Northampton
Washington

NSE CORP

8147 VIOLA ST

NUCLEAR EXPERTISE INC

1033 N FAIRFAX ST

NVT TECHNOLOGIES INC

1111 Towlston Rd

OAKTON THREE ENGINEERS OFC

10467 WHITE GRANITE DR

OAKTON TWO ENGINEERS OFFICE

10461 WHITE GRANITE DR

OBERON ASSOCIATES

9700 CAPITAL CT

OCEAN CITY RESEARCH CORP

1100 NEW JERSEY AVE SE
Washington

OHI Design

9208 B Venture Ct

OLDE TOWN ENGINEERING CO

10527 BRADDOCK RD

OLGOONIK DEVELOPMENT LLC

1550 Wilson Blvd Ste 300

OMNI ENGINEERING & TECH INC

7921 JONES BRANCH DR

ONE ROCKLEDGE ASSOC

6600 ROCKLEDGE DR

ONE WAY ENGINEERING

6205 CRAIN HWY

OPTIMAL ENTERPRISE SOLUTIONS

6700 HUNTERS RIDGE RD

ORANGE TECHNOLOGIES INC

13 FIRSTFIELD RD

ORNAMETALS INC

1400 MARBLEWOOD AVENUE

PAACC TECHNOLOGY

15501 CASULAS WAY

PACIFIC ARCHITECHTS & ENGRS

1525 Wilson Blvd Ste 900

PANCHOLI ENGINEERS

12607 GLEN RD

PEER CONSULTANTS

5000 OVERLOOK AVE SW
Washington

PEGASUS INTERNATIONAL

21770 BEAUMEADE CIR

POTOWMAC ENGINEERS

9244 E HAMPTON DR

PREMIER INC

6715 BACKLICK RD

PRIME INC

4009 WILLIAMSBURG CT

PROPULSOR TECHNOLOGY INC

8001 Braddock Rd Ste 105

QUADELTA INC

2450 Crystal Dr Ste 1020

QUASAR'S INC

955 LENFANT PLZ SW
Washington

QVINTA INC

13303 CHALFONT AVE

R J HOULE MECHANICAL INC

112 FREDERICK AVE

RADWAN ASSOCIATES INC

2010 Corporate Rdg Ste 700

RASCO INC

1635 WOODSIDE DR

RATHGEBER-GOSS ASSOC

15871 CRABBS BRANCH WAY

RE STL DESIGNERS

702 Russell Ave Ste 400

REAL ESTATE RESCUE

788 Newtown Ct # 10

RECORDS ENGINEERING LLC

1101 PENNSYLVANIA AVE NW
Washington

REGULATIONS-RESOURCES

3433 CHARLESON ST

REID ENGINEERING CO

1210 PRINCESS ANNE ST

REINFORCED EARTH CO

1372 OLD BRIDGE RD

RELIABLE ENGINEERING

1350 CONNECTICUT AVE NW
Washington

RELIABLE ENGINEERING SVC INC

9700 MARTIN LUTHER KING BLF

RELUMINATI LLC

3233 M ST NW
Washington

RESTL DESIGNERS INC

1775 K St NW Ste 280
Washington

RIBER INC

143 WINDING CREEK RD

ROBERT SILMAN ASSOC

1053 31ST ST NW
Washington

ROBERTS ENGINEERING

118 CULPEPER ST

ROX ENGINEERING

11921 FREEDOM DR

ROX ENGINEERING INC

21155 WHITFIELD PL

ROY D MC QUEEN & ASSOC

3112 FOX DEN LN
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