Qianquqing Ridge-Slope Excavation

The Qianquqing Ridge-Slope Excavation is a forested-slope excavation paired with an east-side service yard at approximately 29°23'10"N, 110°35'54"E in the Qianquqing scenic-zone area near Zhangjiajie, Hunan, classified as containment-candidate class (b) — ridge-slope excavation per doctrine-containment-candidate-classification c0001 at evidence tier medium-high per c0002. The site sits ~3 km NE of the paired class-(a) site site-qianquqing-river-crossing-compound, inside the same Xiangxi-Wuling extension zone. The diagnostic imagery sequence shows intact forest / rural hillside at 2013 baseline, a sudden cut into the forest with a paired east-side construction-staging yard appearing 2019, a cleared bench expanding and regularizing internal circulation 2022, and by 2025 a defined excavated basin or containment bench with steep cut walls, rectilinear edge, and single controlled access. The east-side support yard persists with industrial-looking vertical / linear elements throughout the sequence, reading as a paired support installation rather than as part of the compound itself. The site is admitted as one of four Xiangxi-Wuling-extension inception entries on 2026-04-27 in the containment-candidate track. Classification rests entirely on user-supplied Google Earth historical imagery, per the methodological constraint at doctrine-containment-candidate-classification c0005.

Claims

c0001 — 2013 baseline shows intact forested ridge with no engineered pad

Google Earth historical imagery dated 2013 at 29°23'10"N, 110°35'54"E shows the future excavation location as mostly forested ridge with small rural structures east of a north-south boundary line. There is no large pad on the west side of the road / boundary. The terrain is intact slope / karst woodland with no clearings, no access road off the main track, no terraced agriculture, and no structures inside the future excavation footprint. The 2013 baseline establishes the site as virgin-canopy ridge slope at the start of the framework's elevated-sensitivity 2013–2025 window per doctrine-encounter-window-2.5ma. The pristine-slope pre-baseline parallels the pre-baseline at site-pingtang-sky-bridge-complex c0001 in being an unambiguous absence: there is no pre-existing structure to be relocated or expanded, so the post-2013 emergence is a discrete construction event.

c0002 — 2019 imagery shows new ridge-slope cut with paired east-side service yard

Google Earth historical imagery dated 2019 at the same coordinates shows two paired emergence events. (a) West side: a new cleared bench / pad cut into the forest, with steep cut walls and a single access road threading from the east-side settlement / service area into the cut. (b) East side: construction staging — cranes / linear steel or gantry-class elements, blue-roof sheds, work pads. The east-side activity is industrial-class staging, not residential or scenic-area construction. The diagnostic feature is the paired emergence: ridge-slope cut + service yard appearing in the same imagery date, connected by a single access path, with the access path threading from the settlement / service area on the east into the forest cut on the west. This is the canonical class-(b) ridge-slope excavation morphology per doctrine-containment-candidate-classification c0001 (engineered bench cut into forested slope with single controlled access and paired support yard at the boundary between settlement and forest).

c0003 — 2022 imagery shows pad expansion and internal loop circulation

Google Earth historical imagery dated 2022 at the same coordinates shows the west-side pad expanded and regularized. An internal oval / loop circulation pattern appears inside the cleared bench. The east-side staging from c0002 remains active. The access road becomes a deliberate connector between the settlement / service yard and the forest excavation. The internal-loop pattern is not interpreted here as architectural — it is more parsimoniously read as secondary circulation or grading geometry inside the bench (per the c0007 caveat below) — but its appearance contemporaneous with pad regularization is consistent with the bench transitioning from active excavation to operational use. The 2019 → 2022 progression shows the site moving from construction phase to operational phase while preserving the paired east-side yard.

c0004 — 2025 imagery shows controlled bench with steep cut walls and single access

Google Earth historical imagery dated 2025 at the same coordinates shows the west pad as a defined excavated basin or containment bench: steep cut walls, rectilinear edge, single controlled access path. The east-side service yard persists with industrial-looking vertical / linear elements. The site is now isolated from normal residential fabric except through the single access path threading in from the east-side yard. The 2025 state is the morphological reference point for the class-(b) ridge-slope excavation diagnostic at full development. The combination of (i) cut into otherwise forested slope, (ii) single controlled access, (iii) paired east-side service yard, (iv) industrial-class staging in the yard, (v) maintained over multiple imagery dates 2019→2025 — establishes the site as a sustained engineered installation rather than a one-off construction scar.

c0005 — Class-(b) ridge-slope excavation assignment and tier-medium-high evidence basis

The site is assigned to class (b) ridge-slope excavation per doctrine-containment-candidate-classification c0001 on the basis of the converging diagnostics: (i) engineered bench cut into otherwise forested slope between defined imagery dates (2013 → 2019); (ii) single controlled access path from settlement / service area to bench; (iii) paired support / service yard at boundary between settlement and forest; (iv) industrial-class staging in the support yard; (v) multi-date persistence and expansion 2019 → 2022 → 2025. The site is assigned tier medium-high per c0002: at least three of the five high-tier diagnostics are present (multi-date persistence, terrain isolation, paired support yard), but specific access-control evidence (fence, gate, restricted-road behavior at the access path) is not visible in the cited imagery; promotion to high tier or to confirmed containment infrastructure depends on the c0006 promotion criteria.

c0006 — Named promotion criteria

Per doctrine-containment-candidate-classification c0003, the specific promotion criteria that would resolve this site to confirmed containment infrastructure are: (a) imagery or open-source attestation of fence, gate, guard-post, or restricted-road behavior at the access path or at the perimeter of the bench; (b) persistent service-vehicle or industrial-utility load at the east-side yard inconsistent with scenic-area or quarry-only operation; (c) tunnel / portal / shaft-head evidence visible at the bench's cut wall or at the back of the bench, indicating substrate access; (d) institutional attribution in open-source record (PSB, MSS, military, contracted security, or non-civilian utility operator) at the yard or bench; (e) chain-coupled corroboration — promotion of the paired site-qianquqing-river-crossing-compound ~3 km SW would supply class-(a) coupling support, and shaft-head or portal evidence in the cut wall would also support the substrate-extraction-conflict reading per doctrine-substrate-extraction-conflict. The c0006 criteria are the named audit pathway; the site remains at tier medium-high until one or more is met.

c0007 — Disambiguation: ridge-slope excavation vs. quarry / borrow pit

The dominant alternative reading for a ridge-slope cut of this morphology is a quarry, borrow pit, or road-material extraction site. The framework does not assert that this site is not a quarry; it observes that the morphology is ambiguous between quarry and containment-candidate, and the diagnostic that would discriminate between them is restricted-access evidence (which is the c0006(a)/(b)/(d) promotion criteria). Quarries typically exhibit (i) progressive expansion of the cut face into the slope as material is removed, (ii) a spoil-and-sorting yard with characteristic conical piles, (iii) regular truck-traffic patterns visible as wear on the access road, and (iv) eventual abandonment when the deposit is worked out, with the cut face going dormant or being reclaimed. The site at c0001–c0004 instead exhibits (i) a regular rectilinear bench with steep cut walls that do not expand laterally, (ii) an east-side yard with industrial vertical / linear elements rather than spoil piles, (iii) sustained operational state across 2019 → 2025 without reclaimation. The morphology is more consistent with operational installation than with quarry, but the disambiguation requires the c0006 promotion criteria.

c0008 — Corridor placement and chain-coupling with paired site

The site sits ~3 km NE of site-qianquqing-river-crossing-compound (29°21'57"N, 110°34'58"E) within the same Qianquqing scenic-zone imagery sweep area. The two sites are paired in user-imagery review and are paired in the present admission cycle: a class-(a) hydraulic / crossing-control compound at the river bend, and a class-(b) ridge-slope excavation at the back ridge ~3 km NE. The pairing matches the canonical Shizhu primary-cluster pattern documented at doctrine-cascade-prevention-architecture c0143-class commentary, where a primary operational compound (Sun Lake forensic hub) is paired with a satellite installation (Gaolongcun) at ~32 km offset. The Qianquqing pairing is at much smaller offset (~3 km), suggesting a tighter sub-cluster geometry or a primary-and-back-ridge-support configuration rather than a primary-and-distant-satellite configuration. The paired admission is the first explicit Xiangxi-extension chain candidate; promotion of either site under c0006(e) would supply chain-coupled corroboration for the other.