The letter from Records was lying on the pier, which nobody was supposed to put anything on, and Delfina Ochoa had weighted it with her glasses case.
The boiler was running that Friday morning and the room was warmer than it should have been. She had already written it on a sticky note on the door: BOILER 07:40. NO OCCUPATIONS. She had asked Lourdes to come before she signed, because it was Lourdes's method and she wanted her to hear what was being added to it.
"Three things." Delfina held up a finger. "Every result that uses my table prints the sigma, on the same line, at the same size. Plus or minus next to the number, not under it."
The pane already did that. Delfina knew it did. She wanted it in writing anyway.
"Two. The NOT RESOLVING lines go up with the same weight as the ones that resolve. Your 150 night, same font, same treatment, not behind a filter. If the method can't tell two heads apart, people should be able to count how often."
"Yes."
"Three." She put her glasses on. "226's heads went to depot in March 2045. Both of them. The same week the cards were cleared."
Lourdes had known the month since September. She hadn't set it beside the pier table.
"So 2038 to 2044 is one calibration era for them. One table a year and no reset in the middle. Your method reaches them because they sent the heads out after the nights. If they'd gone in 2041 there'd be a hole in the middle of the record, and nobody could check them now." Delfina wrote in the margin. "I'm putting that in."
"You're telling the next shop how to hide."
"I'm telling Records that a depot ticket marks when a fingerprint changes. That's true for the people who cheated and for the people who didn't. I don't get to keep a true thing quiet because the wrong people can use it." She signed, with the date in the European order, which Records had corrected for nine years. Under her name, in block capitals: OFFSET TABLES ARE CALIBRATION PRODUCTS. ANY USE FOR IDENTIFICATION IS THE USER'S INFERENCE, NOT THE CUSTODIAN'S.
"That's the line 226's counsel is going to quote."
"Good. It's the true one." Delfina folded the letter into an interoffice envelope with a string. "Don't come down here again until January. People will say you were coaching the custodian."
Nobody had asked her to go to TB-14.
On Thursday night, with Tencha's page in the coffee can, she had reread her own paragraph about the headwall and found what she had stepped over. A culvert base couldn't move five microGal in an hour from groundwater. That much was true. But TB-14 didn't sit over ground alone. It sat beside a canal, and a canal is a long strip of water that somebody turns on and off.
The Roosevelt Irrigation District published its gate orders. There was a change at the 99th Avenue check at 21:00 on Saturday, with stage up about half a metre for a Sunday delivery out past Buckeye.
She set her own head on the brass disk at seven. The county seal on it was worn almost flat from tripod feet. Below the ledge the canal ran east to west, lined, brown, quiet, and across the road the feed store had its lights off. Every ninety seconds the tablet gave her a value, raw in one column and, in the other, run through the same tide model Records used and corrected against the barometer bolted to the headwall, a third of a microGal for every hectopascal. The raw column fell smoothly through the evening, eleven microGal in two hours, the solid earth easing back as the moon moved. The corrected column was flat, with scatter of about four-tenths.
At 21:04 the gate turned. She heard it from the shoulder: a long scrape, and then the sound of the water changing its mind. On the tablet a second pane ticked over, the RID's gate feed that the county inversion office had subscribed to since 2046 so its overnight runs could flag stage changes near arterial heads. Nobody had ever pointed it at a base. The stage board on the far bank went from 1.38 to 1.87 over about forty minutes.
The corrected column climbed. It wasn't much. By 21:50 it had come up 1.8 microGal and stayed there, a small clean step, about what half a metre of water should do lying below and beside a sensor on a ledge. She checked the barometer pane before she let herself believe it. 1011.6 at nine, 1011.4 at ten. A December front could put a step that size into a night all by itself, and this wasn't one. In fourteen years of opening on bases she had never seen groundwater move one like that. This wasn't groundwater. It was the canal.
She had no paper, so she wrote it on the back of a sticker roll. TB-14 VS RID STAGE ~3.6 µGAL/M, 1.38 TO 1.87 ONLY. FIVE µGAL WOULD NEED ~1.4 M IN AN HOUR.
The "only" was there because the channel was a trapezoid. It got wider as it filled, so a metre near the top weighed more than a metre near the bottom. What she had was a slope over one stretch of the board, not a constant.
She didn't know what the stage had done on 15 May 2042 between 21:10 and 22:20. For a week she had been certain the base couldn't move. Now she knew it could. Probably not enough to matter, but "probably" wasn't a word the method allowed.
At half past eleven a ditch rider's truck crept along the far bank road. His flashlight went to the stage board, then to her, then off. She raised a hand and he raised one back.
His name was Ramiro Tapia, and he had been zanjero on that reach for twenty-two years. On Monday at seven he recognized the truck before he recognized her.
"You were on the disk. With the box."
"I was weighing your canal."
He found that funny for about a second, and then he thought about it. "Half a metre Saturday. You saw it?"
"Almost two microGal."
"That's nothing."
"It's a third of what I need to be true."
The stage logs before 2044 were paper, in a cage at the district yard in Goodyear. He made a call and didn't ask her to fill anything out. At 09:40 a photo came to his phone from a clerk named Yesenia: a ruled page in pencil, with columns for time, stage, gate and initials.
15 MAY 42. 20:00 1.41. 21:00 1.42. 22:00 1.43. 23:00 1.43. R.T.
"That's me." He tapped the initials. "Steady delivery. I didn't touch it all night."
Two centimetres in two hours. At her rate that came to less than a tenth of a microGal. The canal hadn't made the five, and the 15 May result stood.
She didn't feel relieved, because the result had never been the problem. The problem was a sentence in her method that said a base couldn't move, and it had been true for the wrong reason. Records was going to run 226's nights. 226 had opened on TB-14 too. Every West Valley shop had.
She wrote the amendment in the truck before the coffee went cold. The first draft gave all three canal bases the same range, two to four per metre, and she crossed it out. She had measured one gate change on one reach. The Grand Canal was four times wider than the RID, and Lateral 8 ran in an unlined ditch a metre from TB-22's ledge. Giving them her number would be the same mistake she was amending: a true sentence for the wrong reason.
AMENDMENT 1. BASES BESIDE MANAGED WATER MOVE WITH STAGE. TIES TIDE- AND PRESSURE-CORRECTED. SAME-NIGHT TIE COMPARISONS ON THESE BASES REQUIRE THE STAGE LOG. TB-14 (RID): MEASURED 12/19/48, ~3.6 µGAL/M, STAGE 1.38 TO 1.87 ONLY. TB-09 (GRAND CANAL), TB-22 (SRP LAT 8): COEFFICIENT NOT MEASURED. NOT RESOLVING UNTIL TIED THROUGH A GATE CHANGE. STAGE CHANGE BETWEEN TIES × BASE COEFFICIENT OVER 1 µGAL: NOT RESOLVING, REGARDLESS OF OFFSETS.
Then she called the SRP desk and the Grand Canal zanjero and asked when their next scheduled gate changes were. January 6 and January 11. She put both on the calendar in the truck.
It went to Records, to Delfina, to 63, to 150, and to 226's counsel, all in the same minute, with Ramiro's page attached once he'd said she could.
It would help 226. Some of their nights would have a delivery in the middle and go grey, and every night they had opened on TB-09 or TB-22 would go grey until January. She sent it anyway. The alternative was their counsel finding it in February, and then the whole method going in the bin along with the five nights it had been right about.
Ramiro walked her to the truck. "You going to tell me what it's for?"
"Somebody said they were somewhere. The water says maybe."
He nodded, as if that were an ordinary thing for water to say.
Tuesday night Abuela went to bed early, because tomorrow was tamales and tamales started at five. The masa sat under a towel on the counter. The coffee can was on the kitchen table, where it had never been before, with the lid off.
There were two zip bags inside: Cheque's feed receipt, and Tencha's page, soft and blue at the edges. TOLLESON, YO.
For five days Lourdes had been telling herself that the rule was the rule and the can was the can. Tonight she was going to write out what it would actually take to move a page from the can to the pane. If she couldn't write it, the answer was no. If she could, it was a question for the board, not for her.
She started from the objection she had given Tencha. A base tie put a head at a site. It didn't put a person at a rod. On the pane, a family shop and a seal mill looked the same: two heads, one licence, one name. If anything separated them, it was who else had seen.
PROPOSED (NOT ADOPTED). OVERLAP — HOLDER SIDE.
- ●Base ties resolve both heads on the same base, stage log checked.
- ●A contemporaneous note assigns head to site and names the holder. Must predate the dispute.
- ●A record the licensee does not control places the holder at that site that night.
- ●All three: holder's side ATTESTED LATE (0.6). Other side stays NOT RECORDED.
- ●Any one missing: OVERLAP stands.
She read it the way 226's counsel would. Item two was easy to fake, since a notebook is only a notebook. Item three was the hard one, and she had made it hard on purpose. A family shop parked behind a tire place, or in a church lot, or with a farmer who signed you in. A seal mill had a truck that never stopped anywhere.
Then she read it the way Tencha would. Six years, a flood, a husband dead. Who keeps a log of who parked behind a tire shop?
Probably nobody, and then the answer was still no and the cost was still hers.
At the bottom of the page she wrote down three things so she couldn't bargain with herself in the morning. She would send it as a proposal with her name on it and no result attached. She would not tell Records whose night had prompted it. And she would not go looking for item three herself. A notary who found the evidence for her own rule had the same problem as a notary who ran 226's numbers.
She sent it at 21:52. Then she texted Tencha, who read her phone on Thursdays: I SENT RECORDS A RULE. IT NEEDS SOMEONE WHO ISN'T YOU OR MEMO OR PABLITO WHO SAW YOU IN TOLLESON THAT NIGHT. I CAN'T LOOK FOR THEM. YOU CAN.
A minute later a reply came from a number she had never texted. Pablito. el de las llantas guardaba un libro.
She put the lid on the can.
Leyva Tires was a cinderblock bay on Van Buren with a hand-painted sign, used tires stacked by size against the fence, and a gravel lot behind with two semis parked for the holiday. Rubén Leyva wore his reading glasses on a cord. Tencha had already called him, and so had Pablito, and so had Tencha's sister.
"She says you can't ask me."
"I can't. She asked me to bring the form Records would want, so you'd know what it looks like." It was one page: name, record, whether it was kept at the time, who had held it since. "If you have something, it goes to Records. Not to me, and not to her."
He went into the back. The book he brought out was a green ledger with a taped spine. His insurer had made him keep it after a surveyor's tripod scratched a customer's truck in 2039. Anyone who used the lot after hours signed in with date, name, plate, time in and time out.
She had told herself at 21:52 she wouldn't look for item three, and now she was standing in a tire shop holding the form. Not reading the page was a real difference. It was not a difference 226's counsel would care about. To them it would be the method's author visiting a witness three days before Christmas, after the claimant's family had called him first. Delfina had told her, in so many words, not to give them that.
He opened it for himself, behind the counter, and turned the pages. She looked at the calendar on the wall, a parts supplier's December with a pickup in a snowfield. It had never snowed in Tolleson.
"Mayo," he said. "Dos mil cuarenta y dos." He read for a while, then closed the book on his finger. "You want to know or you don't?"
"I can't."
"Okay." He seemed to approve. He signed the form and slid it into the ledger at the page. "After Christmas I take it to McDowell. Who do I give it to?"
"R. Aguirre. Records, second floor. For the overlap proposal, not for any name."
He wrote Aguirre on the back of his hand.
At the corner of the lot the streetlight had a municipal head in its base, a grey collar with the county seal, its LED amber in the daylight. It hadn't been there in 2042. Back then the only instruments on this lot were the ones families drove in at night, plus a green book an insurer had asked for, which nobody thought of as a record of anything.
In the truck she wrote on the coffee-can bag, under 12/17, so it would go to Aguirre with the ledger and not come out later in somebody else's words: 12/23. WENT TO LEYVA TIRES WITH RECORDS FORM. DID NOT READ. CALLS TO HIM BEFORE ME: 3 (TENCHA, PABLITO, SISTER). BOOK TO RECORDS BY HIM. UNREAD BY 118.
When she got home the house was full of steam, and the head in the streetlight outside had gone green for the night's tap, listening down through the block for water nobody on it would ever see. Nobody asked where she had been. Somebody handed her a corn husk, and she took the next scoop of masa, and spread it thin, the way Abuela liked it, so you could almost see through it to the husk.