Pinal Air Park, Pinal County, Arizona

According to sourcewatch.org the Evergreen Maintenance is - at least was - located at Pinal Air Park, Pinal County, Arizona:
" (...)
Reports from private pilots who have attempted to refuel at the Evergreen Maintenance Center in Arizona indicate that it is a militarized facility:[6]
"Tried to drive to MZJ on Memorial Day. Armed guard refused us entry to FBO. Found out later that this is where TCA is training air marshals. This is a full military base; don't even think about going there."
"Last time I landed at Pinal I got an armed escort directly back to the departure end of the runway. No options. Nice. I been flying Arizona for 10 years."
"FBO was rude and a mechanic told us it was a private airport. Evergreen practically chased us out."

However, some pilots reported a more positive experience:
"Great FBO, very helpful and offered good suggestions on food, lodging etc. Will visit again!! Thanks Evergreen and Craig!!"

Until January 2007 the site was called the Evergreen Air Center.[7]
(...)"
Note (6): http://web.archive.org/web/20060223144441/http://www.airnav.com/airport/KMZJ/EVERGREEN_AIR_CENTER
Note (7): http://maranaaerospace.com/ (Replacement for the original web link
http://www.sourcewatch.org/index.php?title=Evergreen_International_Aviation%2C_Inc.

In the following there is an excerpt from the web site of Maran Aerospace Solutions:
"Formerly Evergreen Maintenance Center, Marana Aerospace Solutions is internationally recognized as one of the world’s most reliable aviation MRO service facilities. We are experts in comprehensive full-life aircraft care, including heavy maintenance, overhaul, commercial storage, component repairs, paint, interior, detailing, and end of life options. We specialize in unscheduled, drop-in maintenance visits with flexibility and dedicated crews to meet your tailored requirements.

For three decades our 1,200 acre facility has provided award-winning solutions for almost every type of commercial aircraft. Now under new ownership, Marana Aerospace Solutions is one of the world’s largest commercial aviation resources and can accommodate over 400 aircraft. Our FAA-certificated technicians, crews, and on-site customer satisfaction teams are dedicated to continuous improvements in operational excellence. LEARN MORE about our innovative solutions, ideal location, and satisfied customers."
http://maranaaerospace.com/


There is a lot about Evergreen and Chemtrails. But it is not easy to make a direct connection between Evergreen and Chemtrails with the exemption that Evergreen is obviously connected with U.S. government tasks in general for decades. The basic news about this connection came originally by NotForSale from the Intel Hub relying on an anonymous whistle blower source:
"On Feb 18, 2010 NotForSale from the Intel Hub interviewed a whistleblower employed as a private contractor at an Evergreen Air facility. The information he provided was mind blowing. Never before had a whistleblower came forward about this top secret facility located in the Arizona desert north of Tucson. In the interview KrisH described how the facility is heavily secured by well armed personnel. During his time at the facility he was involved in retro fitting 727 and 747-c aircraft with liquid discharge tanks and aerosol sprayer devices. He has also confirmed reports of triangular black jets at the facility as well during his time there in the early 1990’s."
http://web.archive.org/web/20100601064730/http://theintelhub.com/2010/05/29/evergreen-air-cia-chemtrail-facility-leaked/

As "KrisH" confirms there were tasks fixed by Evergreen in the early 1990's which may be connected to "chemtrails" as the U.S. Air Force published their "Chemtrails"-series in context with the education of future pilots at the United States Air Force Academy:



Right now - October 21rst 2013 - it is more easy to verify the engagement of Evergreen in weather modification - it is right on its own website:

"MARKETS:

• Firefighting
• Oil Spill Containment
• Weather Modification
• Biochemical Decontamination

The Evergreen Supertanker is not just limited to fighting fire. It will be a true utilitarian aircraft with the capability to configure to different applications on short notice. This multimission aircraft can support sensitive security and environmental missions. The aircraft’s exceptional drop capabilities, loiter time and size make it an ideal tool to perform challenging homeland security missions, able to neutralize chemical attacks on military installments or major population centers, and help control large, environmentally disastrous oil spills.

In addition, the upper deck of the Boeing 747 provides over 200 square feet of space that could be assigned as a command and control center. EIA possesses an FAA exemption number 1870C that permits the carriage of up to five individuals that are not crewmembers in the upper deck. This area is capable of providing space for command and control components that would assist in sophisticated mapping, incident monitoring and video/communications downlink relay that might require additional personnel over and above the required crew."
http://www.evergreenaviation.com/supertanker/mkts.html


At least in the 1990's Pinal Air Park could be an airport from where chemtrails activities came from.