Stonel Associates, Inc.
25 Flint Ridge Road
Monroe, CT 06468
(203) 452-0470

Report No. 0122.1 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 22-JAN-01

Items Tested: One (1) sample column of assembled Risers. Column consists of seven (7) HDPE molded round Risers and one (1) HDPE molded round Lid. The Riser and Lid joints contain foam seals and all sections are secured together with number 10 x 1 ½ inch stainless steel sheet metal screws. The Riser column is 20 inches in diameter, 42 inches in height and gasket mounted on a flat plate.

Object of Testing: To determine the ability of the column to maintain vacuum.

Findings: The column maintained a 5.5 inch Hg vacuum for a minimum of 20 minutes with no visible deflection of the column or visible deterioration of the Riser or Lid joints.

Respectfully submitted,

George E. Nelson
Stonel Associates, Inc.