Revised_SOW.pdf

Greenhouse Installation Statement of Work

USDA-NRCS Corvallis Plant Materials Center 3415 NE Granger Ave, Corvallis, OR 97330

Demolition and Site Preparation

• Demolition and removal of remnant concrete greenhouse stem walls attached to remaining head house {Figures 1-3). Walls are 8" thick and 30" high from ground level, with 18-24" footings. The two side walls are 30'6" long and the end wall is 25' wide with a 52" gap for a door frame. Adjacent wood frame head house is to remain intact and unharmed.

• Demolition and removal of old 4" concrete walkways and two {2) 4" concrete mechanical pads (52" x 71") as needed to accommodate new greenhouse footings, walkways, and benches. Five

(S) existing walkways each measure 24" wide by 164" long by 4" thick {Figure 4).

• Removal of pea gravel between walkways for reuse in new walkway configuration.

• Backfill of holes with clean fill dirt and/or gravel as needed to create smooth, level, compacted site for installation of new greenhouse footings and concrete walkways.

Installation of new greenhouse kit and benches

• Installation of inflated double-wall polyfilm hoop frame Quonset style greenhouse kit according to manufacturer's instructions. Greenhouse specs:

o Galvanized carbon steel pipe frame, with at least 1-7/8" 13 gauge bows, arch spacing at 4-ft on center o Inflated double-layer polyfilm roof, 6-mil, T-4 clear polyfilm, 14 year life, and poly inflation fan with mounting brackets and accessories o 6-ft roll-up side walls o Two single-wall corrugated polycarbonate end walls with sliding doors

• Supply lumber for end framing and side boards as specified in greenhouse manufacturer's instructions.

• Installation of 4 rolling greenhouse benches on cement footings. Bench specs (benches, legs, and hardware to be provided by USDA):

o Rolling benches, 4 each 6' x 26' expanded metal tops, 32" tall, with leg stabilizers and feet

• Construction of new 4" concrete walkways (see bench/walkway diagrams, Figures 5 & 6):

o Two (2) walkways along the ends at 30' long by 36" wide.

o Two (2) walkways running lengthwise along the sides at 26' long by 36" wide.

o Two {2) walkways running lengthwise at 26' long by 24" wide.

o One {1) wider {48" wide) walkway running lengthwise from door to door adjoining existing 48" pathway; possible 6' extension needed to replace the existing 6' concrete entry pad, extending the existing 23' long walkway the entire length of the greenhouse.

• Replacement of pea gravel between concrete walkways under benches.

• Installation of ventilation exhaust fan system in end wall (supplied by USDA, Figure 7) if still operable and appropriately sized, or replacement with new appropriately sized equivalent exhaust fan system.

• Installation of gas furnace, ducts, and chimney {supplied by USDA, Figure 8).

AG-4D90-S-17-0070 Revised SOW

Figure 1. Existing head house(to stoy in ploce) and 30" concrete side wallsfrom old greenhouse roberemoved. New greenhouse to be installed as a f ree-stand ing structure leaving o 7' breezeway between the head house and new greenho115e.

Figure z. So(Jth view of old greenhouse side walls, 48''-wide main walkway (to remain in placewithextension on south end). ond remaining head hovse.

Figure 3. Southeost side of old greenhouse with 4" concrete mechonicol pods in theforeground.

Figure 4. Existing 4" concrete walkways surrounded by pea grovel.

"" T

- II, I

S;

"u-:'

'I l !r

- · --- "01 C"l\ l ---- ·- lr IN <f!

(J)..

'I .......... , - . - ,..- · ';,;;,t • 0..

D I ro t,.

I- . ' ..

Nu:

• I-

1 1r I

1)

CJJ

ro ::s :::r llI a, Figvrc 5. fx()mploJ confiauro1ion of four 6/t widt! rolling benches in o 30' wide g1l'Cnl10usc.

I

I

I

. Dl7(>("" I hgure 6. Example mo.-Jified walkway and bcncll configuration co occommonote existing walkways.

r

.>.I

:2

...,:. .,.,...............- -,,-r(- .-.--

-tv-·v'--' L-J, :1i gure 7. Exhaust fan system to be reinstalled in new greenhouse if possible, or replaced with equivalent apf)ropriotely sizedfan.

Figure 8. Gos fumocc and ducts to be reinstalled in new greenhouse.