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Due to the high groundwater conditions underlying the facility, watertightness is a paramount issue <br /> regarding septic tank construction material, along with structural integrity. It is assumed the <br /> existing concrete lift stations are watertight at this tune. Concrete tames, especially of two-piece <br /> construction,are prone to leakage, and all tanks are prone to leakage particularly at the connection <br /> points of the inlet and outlet piping. Concrete tanks must be coated with an epoxy-type seal to <br /> create watertightness, which is subject to eventual decomposition, Fiberglass and plastic tanks offer <br /> one-piece construction, and are known to have greater watertightness properties. <br /> Fiberglass tanks offer probably the best all-around watertightness because the inlets and outlets are <br /> molded monolithically with the structurally watertight tank itself. The use of flexible pipe <br /> connectors assists in preserving watertightness. Fiberglass tanks are more prone to buoyancy than <br /> concrete tanks and therefore must be anchored to counteract this buoyancy. <br /> FINDINGS <br /> SEPTIC TANK MANUFACTURERS/SUPPLIERS <br /> Five highly-rated septic tank manufacturers were investigated for construction material, <br /> watertightness, size, structural strength (traffic rating) and cost, and are summarized in the Chart <br /> below. <br /> TANK COMPOSITION SIZES TRAFFIC COST NOTES/ <br /> RATING COMMENTS <br /> Xerxes Fiberglass IS00.3000,400o, 1-1-20 1s00 $51W1 <br /> 8000,9000,cl A <br /> Corporation 3-1000=s2.51p1 <br /> 8000 F'54,75/yd <br /> 1 <br /> Containment Fiberglass 1200,2500,3500,so0o, ia0oo,��„1 I-I-20 /zoo�ss,soraal <br /> Solutions, Inc. 3-1000 U.701gal <br /> a0oo 51,53lgal <br /> Infiltrator Rotomolded 1,500 max W-15 =$4,000 <br /> Systems Plastic <br /> Snyder Rotomolded 1,500 max 14-20 -$6,000 <br /> Industries Plastic <br /> Premier Tech Polyethylene 2,000 max 14-15 =$7,500 <br /> From the data obtained.,Xerxes Corporation and Containment Solutions offer the best tanks <br /> available,particularly with regard to watertightness. <br /> N <br /> Page 2 of 7 <br /> Chesney Consulting <br />