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WHAT IS A ROCK SANDWICH?<br />
IT IS A LAYER OF STONE OR CRUSHED ROCK<br />
“SANDWICHED” BETWEEN 2 LAYERS OF<br />
FILTER FABRIC USED AS A ROAD BASE<br />
THOUGH THE DEP-BMP CALLS FOR A<br />
MINIMUM 12” THICK LAYER OF 3”-6”<br />
STONE, ACTUAL SANDWICH THICKNESS<br />
AND STONE DIAMETER CAN BE ADJUSTED<br />
ACCORDING TO SITE SPECIFIC<br />
CONDITIONS AND AVAILABILITY OF STONE
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