SIERRA ONE STAYS

12-UNIT COMPLEX — MACRO-SITE LAYOUT + NETWORKED DC MICRO-GRID + CENTRAL WASTEWATER
6 × 40FT HC CONTAINERS PER SHEET A-100 R2 · CHEVELON CANYON AREA · NAVAJO COUNTY, AZ · ELEV ±6,600 FT
SHEET C-100 / E-100 / P-100 · CIVIL SITE + ELECTRICAL ONE-LINE + PLUMBING PLAN
DATE: 07/08/2026 · STATUS: PRELIMINARY — NOT FOR CONSTRUCTION
PENDING: AZ PE STAMP (CIVIL + ELEC + MECH) · NAVAJO CO. PERMIT · ADEQ REVIEW
DESIGN CRITERIA: 115 MPH Vult EXP B · SDC B · 45 PSF SNOW
⚠ DESIGN-INTENT DOCUMENT. GRADING, DRAINAGE, TRENCHING, PROPANE SETBACKS, WATER SUPPLY, SEPTIC/DRAINFIELD SIZING, AND ALL ELECTRICAL SIZING REQUIRE ARIZONA-LICENSED PE REVIEW AND STAMP. NEC 2023 ART. 480/690/705/710 (STAND-ALONE & DC MICROGRID) AND ADEQ AQUIFER PROTECTION / ON-SITE WASTEWATER RULES (R18-9) GOVERN FINAL DESIGN.
WATER STRATEGY: Each of the 12 units has an independent, non-interconnected potable water supply — a roof-mounted 305-gal tote per unit (Sheet A-100 R2 §5.4) — refilled by tender truck. There is no site-wide potable water main. Wastewater from all 12 units is collected via gravity laterals into a single central septic system (this sheet).

1.0 — SITE PLAN · TWO PARALLEL ROWS OF 3 CONTAINERS (12 UNITS)

PARCEL LIMIT SHOWN 300' × 233' (FIELD VERIFY) U1U2 U3U4 U5U6 U7U8 U9U10 U11U12 ROW A — ROOF PV 2.46 kW EA (GREEN HATCH) + 305-GAL WATER TOTE EA. UNIT (BLUE), ENTRIES OUTBOARD ENDS ROW B — MIRRORED, ENTRIES OUTBOARD ENDS POWER HOUSE GEN 30kW + RECT + CTRL + INV 15kW LP 1000 GAL 10' MIN SETBACK SEPTIC TANK 2,000 GAL DRAINFIELD ≈1,400 SF (ADEQ TYPE IV SOIL BASIS) SETBACKS: ≥100' FROM ANY WELL · ≥50' FROM PROPERTY LINE · ≥27' FROM PARKING (SHOWN) · CONFIRM SITE-SPECIFIC PER ADEQ R18-9 TRENCH SPINE — 36" DEPTH: 2" PVC (DC TRUNK) + 1.5" PVC (AC RING) + 1" PVC (COMMS) + #6 BARE Cu GEC POWER/COMMS LATERALS AT DEMISING CENTERLINE → EACH WET-CORE MEP PAIR SEWER MAIN — 4" PVC GRAVITY, 1/8"/FT MIN SLOPE, TO SEPTIC (10' MIN HORIZ. SEPARATION FROM POWER/COMMS TRENCH) 4" LATERAL PARKING — 12 STD STALLS 9'×18' + 1 VAN ADA 13'×18' (EAST END) · GRAVEL, GRADED 2% AWAY ADA 24' DRIVE AISLE / FIRE ACCESS · ENTRY DRIVE AT SW N 30' GAP TYP. 92' ROW SPACING (COURTYARD)
━ ━ (yellow) — Joint power/comms trench, 36" cover ━ ━ (blue) — Sewer trench, 4" PVC gravity, separate from power/comms Green hatch — Roof-mount PV array per unit Blue square on roof — 305-gal water tote per unit (independent supply) Yellow tick on container — Demising CL / central wet-core MEP Power house: generator, rectifier, controller, central inverter Central septic tank + drainfield: all 12 units' wastewater only — no potable main on site

2.0 — DC MICRO-GRID ONE-LINE SCHEMATIC

± 380 VDC SITE BUS (NOMINAL 380 · FLOAT 384 · GEN-ASSIST <360 · GEN-STOP >395 SUSTAINED) CABIN NODE — TYP. OF 12 PV 6×410W (2.46 kW) → MPPT 48V LiFePO4 10.24 kWh (EG4/ANKER) 48V DC LOADS: LTG · FRIDGE · LOCKS BIDIR DC-DC 3kW: 48V ↔ 380V AC SUBPANEL ← SITE AC RING CANBUS NODE CTRL + METERING #8 Cu LATERAL + 15A DC FUSE × 12 NODES — EACH EXPORTS SURPLUS PV / IMPORTS ON LOCAL SOC < 30% CENTRAL INVERTER BANK 15 kW GRID-FORMING, 380VDC IN 120/240V 1Ø AC OUT → SITE AC RING (MINI-SPLITS + RECEPTACLES ALL UNITS) N+0 NOTE: AC RING LOAD-SHED TIERS VIA NODE CTRL ON BUS <355V DUAL-FUEL GEN 30 kW PROPANE PRIME 27 kW (10% DERATE) ≥ 19.5 kW SITE DIVERSIFIED DEMAND ✓ N+0 → 30 kW RECTIFIER/CHARGER (79A @ 380V) AUTO-START CONTROLLER (DSE/ComAp) START: BUS <360V FOR 120s OR SOCavg<25% STOP: BUS >395V 30 MIN / SOCavg>90% #1/0 Cu TIE + 100A DC BREAKER CAN 2.0B / RS-485 COMMS BACKBONE (SHIELDED, SEPARATE 1" CONDUIT) — NODE SOC TELEMETRY, LOAD-SHED CMDS, GEN DISPATCH

2.1 FAILOVER SEQUENCE (AUTOMATIC, NO OPERATOR)

STATETRIGGERACTION
NORMALBus 375–390 VNodes self-balance: PV surplus exports to bus; deficit nodes import. Central inverter carries AC ring from bus.
ALERTBus <365 V or SOCavg <35%Controller pre-heats gen (block heater already on winter schedule), sheds Tier-3 AC loads (receptacle convenience circuits).
GEN-ASSISTBus <360 V for 120 s OR SOCavg <25% OR any node <15%Auto-start dual-fuel gen → rectifier feeds bus at 390 V, 79 A max; batteries recharge; AC ring fully restored.
RECOVERYBus >395 V sustained 30 min AND SOCavg >90%Gen cool-down 5 min, stop. Rectifier contactor opens (reverse-current blocking diode + contactor = anti-backfeed).
FAULTBus <340 V (gen fail)Nodes island: each cabin isolates to local 48 V battery + DC loads only; AC ring de-energized; alarm via cellular monitor.

3.0 — GRID ENGINEERING SPECS

3.1 LOAD & GENERATOR BASIS

ITEMVALUEBASIS
Per-unit connected load2.5 kWMini-split 1.0 + receptacles 1.2 + DC ltg/fridge/ctrl 0.25 + ERV/WH ignition 0.05
Site connected30.0 kW12 units
Diversified demand19.5 kW0.65 demand factor (transient lodging, PE to confirm per NEC 220)
Generator30 kW dual-fuel, liquid-cooled 1800 RPMPropane prime derate −10% → 27 kW ≥ 19.5 kW demand · N+0 ✓ · cold-weather kit + block heater (−10°F starts)
Fuel1,000 gal LP tank27 kW ≈ 3.2 gal/hr full load → ~34 days at 30% duty (800 gal usable); NFPA 58 setbacks ≥10 ft

3.2 CONDUCTOR / TRENCH SCHEDULE (Cu, THWN-2, PVC CONDUIT, 36" COVER)

RUNCONDUCTORAMPACITY / LOADV-DROP (WORST)
Cabin lateral → DC bus (per pair, at demising CL)#8 Cu, 2-wire ±380 V, 15 A DC fuse ea. node6.5 A export max0.61 V @ 60 ft = 0.16%
DC trunk spine (row aggregate)#4 Cu19.8 A (3-container row full import)1.83 V @ 150 ft = 0.48%
Gen rectifier → bus tie#1/0 Cu, 100 A DC breaker79 A (27 kW @ 342 Vmin)0.26 V @ 15 ft
AC ring (inverter → cabins, 120/240 V)#6 Cu, 60 A ring main, 20 A branch per unit8.3 A/unit, diversity applies<1% all runs
CommsShielded twisted pair (CAN/RS-485) + Cat6 spare, 1" PVC, separate from power——
Grounding#6 bare Cu GEC in trench, ground ring at power house, rod at each container pier group; bond container shells——

3.3 BATTERY SIZING (PER-NODE + FLEET)

ITEMSPEC
Per cabin10.24 kWh 48 V LiFePO4 (2 × 5.12 kWh rack: EG4-LL-S or Anker SOLIX BP5100 class), UL 9540/1973 listed, inside conditioned MEP closet
Fleet total122.9 kWh
Daily unit consumption (est.)4.5 kWh (shoulder) / 7 kWh (peak HVAC)
Autonomy w/o sun or gen≈2.3 days shoulder · ≈1.4 days peak → gen dispatch thresholds set accordingly
PV per cabin6 × 410 W = 2.46 kW roof-mount, 10° tilt ballasted-rail on standoff roof, wind-rated 115 MPH Exp B; fleet 29.5 kW STC
Charge coordinationNode controllers stagger bulk charge windows over CAN bus to cap trunk current at 20 A design limit

3.4 CODE / COMPLIANCE NOTES

ITEMNOTE
NECArt. 710 (stand-alone), 706 (ESS), 690 (PV), 480, 225 (feeders between structures); DC bus >300 V requires listed DC-rated OCPD + disconnects at each structure entry
DisconnectsLockable DC disconnect + AC branch disconnect at each container exterior (first-responder placard); master disconnects at power house
PropaneNFPA 58: 1,000 gal ASME tank ≥10 ft from buildings/property line; protected from vehicle impact (bollards)
Fire access24 ft drive aisle maintained; power house 1-HR rated enclosure w/ ventilation per gen manufacturer
Navajo Co. / ADEQSite plan review, grading & drainage plan (2% away from all pads), septic under separate ADEQ permit; SWPPP if disturbance ≥1 ac

4.0 — CENTRAL PLUMBING PLAN (SHEET P-100)

Water and wastewater are two independent systems on this site — they are not both shown as a network schematic like §2.0, because there is no site-wide water piping. The diagram below shows the wastewater collection network only; water supply is per-unit and self-contained (roof tote → unit fixtures, no interconnection).
U1/U2 U3/U4 U5/U6 U7/U8 U9/U10 U11/U12 ROW A MAIN — 4" PVC, 1/8"/FT SLOPE ROW B MAIN — 4" PVC, 1/8"/FT SLOPE COMBINED MAIN — 4" PVC → LIFT/SEPTIC SEPTIC TANK 2,000 GAL, 2-COMPARTMENT 840 GPD DESIGN FLOW DRAINFIELD ≈1,400 SF, ADEQ TYPE IV SOIL GRAVITY OR LOW-PRESSURE DOSED FINAL LAYOUT PER PERC TEST + ADEQ-APPROVED DESIGN REPORT NOTE: NO POTABLE WATER NETWORK EXISTS ON SITE. EACH UNIT'S ROOF TOTE (305 GAL) IS SOLE-SOURCE, REFILLED BY TENDER TRUCK. DIAGRAM ABOVE = WASTEWATER ONLY.

4.1 WATER SUPPLY — PER-UNIT (NO SITE MAIN)

ITEMSPEC
Source305-gal roof-mounted poly tote per unit (12 total, 3,660 gal fleet capacity); independent — no unit shares supply with another, including paired units A/B
Demand basis70 GPD/unit (2-guest × 35 GPD), 840 GPD fleet — informational only; each tote sized against its own unit's draw, not pooled
Autonomy≈4.4 days/unit before refill required
Delivery / refillTender truck access via 24' drive aisle to each row; roof fill port + gauge per unit (Sheet A-100 R2 §5.4); refill logged against turnover schedule
Pressure/treatmentBooster pump per unit (§5.4); point-of-use sediment + carbon filtration at manifold; UV or chlorination stage recommended if tote water is not treated at fill — confirm ADEQ approved-source requirements for tendered water at time of design

4.2 WASTEWATER COLLECTION — CENTRAL SEPTIC

ITEMSPEC / BASIS
Design flow840 GPD (12 units × 70 GPD) — confirm against ADEQ Type IV design-flow table for transient lodging at final engineering
CollectionIndependent per-unit DWV to row lateral (4" PVC, min 1/8"/ft slope) → row main → combined main → septic tank; laterals in dedicated sewer trench, ≥10 ft horizontal separation from power/comms trench, cleanouts at every bend and every 75 ft straight run
Below-container transitionEach unit's 3" DWV exits its below-floor belly cavity (Sheet A-100 R2 §5.5) at the container perimeter via a flexible coupling accommodating pier settlement/frost heave, drops to 36" trench depth, then reduces/transitions to the shared 4" lateral — riser section insulated and heat-traced above frost line
Septic tank2,000-gal precast concrete or fiberglass, 2-compartment, sized at ~2-day retention on design flow; effluent filter at outlet tee
Drainfield≈1,400 SF at 0.6 GPD/SF (conservative Type IV soil assumption) — actual sizing requires percolation test + ADEQ-approved on-site wastewater design report; gravity or low-pressure dosed distribution per final geotech
Setbacks≥100 ft from any well, ≥50 ft from property line, ≥25 ft from structures/parking (ADEQ R18-9 minimums — site-specific setbacks confirmed at design report stage)
WinterizationAll sewer lines below frost depth per Navajo Co. amendment; septic tank riser/lids insulated or buried to full frost depth; no exposed piping
PermittingADEQ Type 4 General Permit (or individual permit if flow/soil conditions require) — required prior to any excavation; Navajo Co. concurrent review