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We drove straight to southern Newton for another check. Getting samples was tricky out here because there were even more cops, and just owning a black van was reason enough for a life sentence. I'd had success before, though, just on pure balls. "Yes, officer, I'm Sangamon Taylor with GEE International, we're working on a sanctioned investigation here [whatever that meant] tracking down illegal dumping in the [insert name of town] sewer system. You live in this town, officer? You have children? Noticed any behavioral changes lately, any strange rashes on the abdomen? Good. I'm glad to hear it. Well, it looks like my assistant is just about finished, thanks for your help."

We had to check three manholes before we made a bingo. Newton had its very own sewer system with its own manholes, which made things confusing. I was forced to deploy the above-mentioned speech while Bart was checking number two. Usually it was hard to convince them that you worked for a real environmental group, but the Zodiac on top of the van, with GEE in orange letters, made it all look plausible. I'd have to remember that trick. Word got out on the radio, and at manhole number three, a cop actually stood there and directed traffic around us while we worked.

Which doesn't necessarily mean we fooled them, but they could see we weren't out to cause trouble, and things went a lot more smoothly when they stood there with their flashing lights. And that's mainly what a cop wants: things to go smoothly.

More organic chlorine. We headed west. Once we got out into Wellesley we were sampling more often. That got us into the city limits of Natick, and this was where things got really tricky. Until now, we'd been following a single line, but here the possibilities were branching out in every direction and it was necessary to check manholes at every branch.

My maps didn't run this far out, so things got primitive: drive around slow, look for manholes in the street, scratch your head. We got lost immediately, just past Lake Waban, did a lot of U-turns and sketching of diagrams on the old McDonald's napkins in the back. We sort of thought that there was a major branch here-a lot of Natick sewer lines feeding into the big tunnel.

"This is going to take fucking forever," Bart pointed out. By now it was three in the morning and we had about eight manholes to check.

"Hang on for a sec," I said. There was a 7-Eleven half a block away and I trotted over and scoped out their phone book.

All they had was a white pages, so it was kind of a random search. I was trying to think of all the prefixes that high-tech companies give themselves. "Electro," "Tec," "Dyna,"

"Mega," "Micro." In ten minutes or so, I had found half a dozen of those, and the last one had an interesting address: "100 TechDale."

TechDale had to be some kind of high-tech industrial park. I looked it up by name: TECHDALE DEVELOPMENTS, followed by an office address in downtown Wellesley and one for their development in Natick.

And then, gods of Science forgive me, I couldn't help it. It was biased thinking, but I couldn't help it. I looked up Biotronics Incorporated. They had a facility in Natick, alright: 204 TechDale.

Inside the 7-Eleven they sold maps of the area. TechDale was so new it hadn't shown up on the maps yet, but the clerk showed me where it was: a couple of miles away on Cochituate Avenue, out in the direction of the lake by the same name. I spread the map out on the counter and simply traced Cochituate Avenue backwards toward us. It crossed our path a quarter of a mile away. We'd already driven up and down it a couple of times, and found a manhole in it.

I got back into the van. "We want the manhole on Cochituate Avenue," I said. "Over there."

"Why Jo you say that?"

"Prejudice. Sheer blind prejudice."

"You think black people did it? Is that why we were in Roxbury?"

We checked the manhole. It was the right one. The chlorine was still there.

Or so I told myself, because I was tired and we were running out of time. What I had was a substance in a test tube that would turn red in the presence of organic chlorine compounds. When I used it on the Dorchester Bay sample, or the Roxbury sample, it came out looking like burgundy wine. This last sample looked a little more like rose. The concentration was getting weaker as we approached the source. And that didn't make a damn bit of sense. Obviously it should've been the other way around. I could think of a few bizarre hypotheses to explain it, but they sounded like the work of a pathological liar.

This, friends and neighbors, was depressing as hell. As we moved west on Cochituate Avenue, the concentration kept decreasing. The toxin was still there, definitely at illegal levels, but it was doing the wrong thing.

We tested it on one side of a residential subdivision and it was high enough to be illegal. We tested it on the other side and it wasn't there at all. We'd lost the trail.

"So they don't want to dump right from the company property. They put it into tank trucks. They drive a couple of miles to the subdivision with the curvy streets. The trucks drive down the streets dumping the shit into the gutters."

We drove down every street in that fucking division and didn't see anything. We tested its sewer system and didn't even find a trace.

"Explain that to me, goddammit," I shouted at Bart. "Upstream of the houses, no chlorine. Downstream, there's chlorine. We check the place where the houses dump their shit into the stream, and there's no chlorine there either. So where the fuck does it come from?"

Bart just looked out the windshield and tapped his steering wheel to the beat of the radio. He was tired.

"Let's see what else is on Cochituate Avenue," I said. He shifted into gear without a word. We drove one more mile and arrived at TechDale.

I'd seen these things before. They looked just like suburban housing developments, with the same irritating maze of curved streets, but instead of houses, they had big boxy industrial buildings, and instead of lawns, parking lots. We coasted to a stop and read the logos on the buildings, and about half of them all said the same thing: Biotronics.

"Well, I'll be dipped in shit," Bart said.

"I've already tried that," I mumbled, watching the horizon think about letting the sun come up.

Instead of cruising around this well-scrubbed development at four in the morning in our battered black van with an environmental group's Zodiac strapped to its roof, we pulled in at a gas station-cafe on Route 9, just a couple of blocks away. We topped off the van and filled up the Zodiac's tanks with 50:1 mix, all on the GEE gold card. We went in for more coffee. What the fuck, we scarfed down tremendous breakfasts and punched some tunes on the jukebox. We struck up a warm relationship with our waitress, Marlene. We asked her about the industrial park and she started rattling off the names of the occupants.

"...and then there's Biotronics. But we don't see much of them."

"Why? What's different about Biotronics?"

"Safety regs. They have to take a shower when they go in every morning, scrub with disinfectant, and again when they go out. So it's kind of a hassle for them to come over here for lunch."

"You want to go in there, before it gets light?" Bart said when Marlene had disappeared. My respect for the man continued to grow; he was ready for just about anything.

"You'd make a great terrorist," I said, "or criminal."

"Look who's talking."

"No. If we got caught, we wouldn't have any toxic evidence to back us up. Shit! I can't believe this. I was all ready to phone up all my media contacts. It's the same thing as with the PCBs in the lobsters. I have hard evidence, I start tracking it down and it slips through my fingers. Like picking up a handful of sludge: squeeze too hard and you loose it."