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diff --git a/docs/facility-security.md b/docs/facility-security.md
index 9dd0e97..a19714e 100644
--- a/docs/facility-security.md
+++ b/docs/facility-security.md
@@ -136,7 +136,12 @@ sprinkler demand, so the site carries its own reserve and pumps.
 **Warehouse racking height drives the real number.** If finished-goods
 storage goes above roughly 3.7 m, the commodity classification and sprinkler
 design change, and the stored volume grows with them. Fix the racking height
-before the fire design is frozen, not after.
+before the fire design is frozen, not after. The
+[Payap scenario model](site-candidates.md#payap-scenario-model-october-2026)
+draws the 9 m × 4 m tank with its pump house at the front. It also draws
+6 m warehouse racking and about twice the floor area this figure was
+based on, a paper store among it, so treat ~200 m³ as a floor there,
+not as the answer.
 
 The property insurer will drive much of the final specification, so involve
 them before the design is fixed. The archive gas system and the BESS
diff --git a/docs/site-candidates.md b/docs/site-candidates.md
index 155813a..0d5b2aa 100644
--- a/docs/site-candidates.md
+++ b/docs/site-candidates.md
@@ -146,7 +146,10 @@ and every equipment envelope is an estimate.
     ([pressing line](equipment/pressing-line.md)).
   - **Press hall** (~870 m²): two Duplex systems, each two HRP 12 presses
     with an EX 50 and an EX 35, the Classic, and ten more Classic
-    positions in two rows.
+    positions in two rows. Each Duplex is one operator's cell of about
+    5 × 3 m at Newbilt's machine sizes: presses either side turned
+    towards the operator, the extruders behind him, one trimmer in front
+    ([pressing line](equipment/pressing-line.md)).
   - **One shared hydraulic and compressed-air supply**: a central plant
     room (~62 m²) at the west end of the press hall, and a service trench
     along the press rows for the hydraulic ring main, compressed air,
@@ -199,13 +202,20 @@ and every equipment envelope is an estimate.
 - **Utility yard** behind the press hall, across a 6 m lane:
   - boiler house with chimney and a covered fuel store;
   - chiller and cooling tower;
-  - process and fire water tanks;
+  - a raw water tank (5 m × 3 m, as in the phase 1 RFQ);
   - PEA transformer;
   - a pipe bridge that drops into the service trench.
 
   Boiler, chiller and transformer are drawn at the one-Duplex sizes. They
   need re-sizing for five presses, and again if the Classics are added
   ([scale](scale.md)).
+- **Fire water** at the front, reachable from the frontage without
+  entering the production yard
+  ([facility security](facility-security.md#fire-water-supply)): a
+  9 m × 4 m tank (~200 m³ usable, planning figure) on a ring foundation,
+  with a pump house for the duty (electric), standby (diesel) and jockey
+  pumps. The model's 6 m warehouse racking and its larger buildings will
+  raise the volume; the hydraulic design sets it.
 - **Access**:
   - one gate on the south side opens onto a truck apron in front of the
     dock doors;