[![enter image description here][1]][1]

From the Chart Supplement it seems 1O5 fails the [old] requirement for the attendant hours of Mon-Fri 10 AM to 4 PM.

    1O5: Unattended
    SIY: Attended Sun–Fri 1600–0100Z‡

While the attended duration is 8 AM to 5 PM (standard time) for SIY, the FBO may have intermittent, seasonal, or on-demand presence.

* Fuel is self-service for both [1O5][2] (Steelman Aviation) and [SIY][3] (Eagles Nest Aviation).

###Tick, tock:

Your concern is valid according to the [Charting Group Meeting 15-01 – April 28 - 30, 2015][4]:

>Many pilots believe that the tick marks indicate the airport has fuel.

>Over the past 20 years, many airports have gone to self-service fueling, eliminating the need for an "attendant" to be on duty to provide fuel services.

>Several airports have contacted us, requesting the tick marks be placed on their airport symbol because they have fuel.

>**Recommendations:**

>Revise the charting criteria to:

>Services available – To qualify as an airport with "services available", the minimum requirement that fuel is readily available (self-service or via attendant) 24 hrs/day.

>Eliminate the requirement for attendant hours.

**Outcome:**

>Rich Fecht, AJV-5223, reviewed the topic. Rich stated that the IACC Requirement Document has been signed and is ready to implement. Visual Charting is parsing through the data to get a list of airports that meet the fuel availability requirements and will soon start updating the VFR charts. Rich anticipates that the updated airport fueling information to be **reflected on all charts within about two years.** This change will affect public airports only.

That means that both airports should get their ticks soon enough.

***
The Chart Supplement does not have to mention temporary shortages according to [IACC 8][5] section 3.1.5.5.4.5:

>The following type data shall NOT be published in the SERVICES and REMARKS sections:

>>g. Temporary shortages of certain types of fuel, starting equipment, or other aircraft services;

***
I got the chart supplement for both airports from [skyvector.com][6].


  [1]: https://i.sstatic.net/t0663.png
  [2]: http://www.airnav.com/airport/1O5
  [3]: https://www.globalair.com/airport/fbo-at-siy-cowling-air-3691.aspx
  [4]: https://www.faa.gov/air_traffic/flight_info/aeronav/acf/media/RDs/15-01-290-Airport-symbol-tick-marks.pdf
  [5]: https://www.faa.gov/air_traffic/flight_info/aeronav/iacc/
  [6]: https://skyvector.com/airport/1O5/Montague-Yreka-Rohrer-Field-Airport