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BLASTING TO START BENEATH THE HILLS; SUBWAY BUILDERS NOTIFY RESIDENTS.

Byline: David Bloom Daily News Staff Writer

The MTA's Red Line subway builders will begin underground blasting beneath the Hollywood hills within a couple of weeks, though officials said most residents should feel little or nothing during the six or seven months of work.

To help explain the blasting, 35,000 homes - including relatively distant neighborhoods in Studio City and Toluca Lake - will receive mailers beginning today from the Metropolitan Transportation Authority.

MTA representatives also will start going door-to-door in neighborhoods near the blasting to explain what will happen.

``We have developed what I feel is the safest underground explosives storage and handling plan I've ever been around,'' said Gordon Revey, an MTA consultant on the blasting who works for Geotek & Associates Inc. of Highlands Ranch, Colo.

The blasting will use water-based emulsion explosives that Revey said are substantially more stable and safe than traditional nitroglycerin-based explosives.

``They're orders of magnitude safer than, in terms of handling, than dynamite,'' Revey said. ``The dynamites are much less forgiving.''

Only enough explosives - about 1,500 pounds - and detonators for each day's work will be delivered to the construction site at access shafts on La Brea Avenue, just north of Hollywood Boulevard.

When the work week is done each Saturday night, any unused explosives will be shipped temporarily back to the manufacturer while construction halts for the rest of the weekend.

Blasting will be used to cut cross passages and utility rooms in the rock between the two tunnels for the Metro Red Line subway extension between Hollywood and Universal City, Revey said.

The MTA already has halved the blasting it will do, restricting the work area to a 1,500-foot-long stretch of tunnel about 750 feet beneath Runyon Canyon Park in the Hollywood hills, Revey said.

Though the blasting work won't stop except on Sundays, each day's work will involve only three or four rounds of timed explosion sequences, each lasting about 10 seconds, Revey said.

The rest of each day will be spent drilling holes in the rock face, packing explosives in the holes and cleaning up the debris resulting from explosions.

Vibration from the explosions will be tracked by five seismometers, Revey said.

But Revey said blast-related ``vibration should hardly be in the perceptible range, much less the level that would cause damage.
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Publication:Daily News (Los Angeles, CA)
Geographic Code:1USA
Date:Dec 6, 1997
Words:383
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