Stonel Associates, Inc.

25 Flint Ridge Road
Monroe, CT 06468
(203) 452-0470

Report No. 0221.2 Date: 07-MAR-01

Re: Polylok Riser - P/N 3009 and Lid - P/N 3009C

Test Conducted For: Polylok Inc.
173 Church Street
Yalesville, CT 06492

Tests performed At: United Concrete Products, Inc.
173 Church Street
Yalesville, CT 06492

Tests Witnessed By: George E. Nelson on 21-FEB-01

Items Tested: Four (4) Riser columns with Lids, secured and equally spaced, in a common six (6) inch slab of concrete. Each column consists of seven (7) HDPE injection molded Risers and one (1) HDPE injection molded Lid. Each Riser column is 20 inches in diameter and 42 inches in height. The Riser and Lid joints contain foam seals and all sections are secured together with number 10 x 1 1/2 inch long stainless steel sheet metal screws.

Object of Testing: To determine the side pull force required to cause a catastrophic Riser column failure, measured with a Dillon 10,000 pound Dynamometer, in a simulated shear load from an uneven frost heave.

Findings: A two-ply heavy-duty nylon sling was positioned on one column in the upper area of the seventh (top) Riser. It was placed under light tension. A two-ply heavy-duty nylon sling was positioned, on the same column, directly opposite in the middle of the third Riser. The column withstood a sustained pull force of 3,000 lbs. in the middle area of the third Riser, without visible deterioration of the column or joints.
It required 4,000 lbs. of side pull force to cause catastrophic failure of the Riser column.

Respectfully submitted,

George E. Nelson
Stonel Associates, Inc.