The following table presents our participation in these plans (dollars in thousands):



	Pension Plan Employer Identification Number	Pension Protection Act (“PPA”) Certified Zone Status¹		FIP / RP Status Pending / Implemented²	Contributions						Surcharge Imposed	Expiration Date of Collective Bargaining Agreement³
Pension Trust Fund	Pension Plan Employer Identification Number	2017	2016	FIP / RP Status Pending / Implemented²	2017		2016		2015		Surcharge Imposed	Expiration Date of Collective Bargaining Agreement³
Locals 302 and 612 IUOE-Employers Construction Industry Retirement Plan	91-6028571	Green	Green	No	$	3,646	$	3,113	$	3,000	No	12/31/2017 5/31/2018 12/31/2019
Pension Trust Fund for Operating Engineers Pension Plan	94-6090764	Red	Red	Yes	10,431		9,266		9,070		No	1/31/2018 10/31/2018 6/30/2019 5/15/2020 6/15/2020 6/30/2020 9/30/2020
Operating Engineers Pension Trust Fund	95-6032478	Yellow	Red	Yes	4,692		5,357		3,647		No	6/30/2019
Laborers Pension Trust Fund for Northern California	94-6277608	Yellow	Yellow	Yes	2,464		2,215		2,403		No	6/30/2019
Construction Laborers Pension Trust for Southern California	43-6159056	Green	Green	No	2,002		2,095		1,349		No	6/30/2018
Laborers Pension Fund	36-2514514	Green	Green	No	3,208		2,328		1,919		No	5/31/2021
All other funds (38 as of December 31, 2017)					10,341		8,708		7,171
			Total Contributions:		$	36,784	$	33,082	$	28,559

¹The most recent PPA zone status available in 2017 and 2016 is for the plan’s year-end during 2016 and 2015, respectively. The zone status is based on information that we received from the plan and is certified by the plan’s actuary. Among other factors, plans in the red zone are generally less than 65 percent funded, plans in the orange zone are less than 80 percent funded and have an Accumulated Funding Deficiency in the current year or projected into the next six years, plans in the yellow zone are less than 80 percent funded, and plans in the green zone are at least 80 percent funded. Subsequent to December 31, 2016, the Operating Engineers Pension Trust Fund zone status changed from red to yellow for the plan’s year-end during 2015.

²The “FIP/RP Status Pending/Implemented” column indicates plans for which a financial improvement plan (“FIP”) or a rehabilitation plan (“RP”) is either pending or has been implemented.

³Lists the expiration date(s) of the collective-bargaining agreement(s) to which the plans are subject. Pension trust funds with a range of expiration dates have various collective bargaining agreements.