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• • The storm chamber detail sheet has been revised to the Contech "ChamberMaxx" design <br /> product and all standard details were not part of the actual design have been removed. <br /> Note that the previously approved drawings contain standard chamber details just in case <br /> they were needed during construction, but were not actually part of the design. <br /> A summary of the items needed for the storm chamber system: <br /> 1. Impermeable liner wrapped about the base and sidewalls of the system. This will <br /> prevent groundwater from entering into the system. <br /> 2. Scour netting around the ends of each chamber system. 90" overlap required over <br /> the top and bottom of the chamber. <br /> 3. Permeable Geo-textile fabric over the top of the rock chamber system to prevent <br /> sediment from entering into the system from the road sub-grade. <br /> 4. Note that inspection ports are optional due to the short length of the system. <br /> Contractor may install some if they wish but it is not a design requirement. <br /> I hope this letter clears up any design or revision questions you may have regarding the recent changes <br /> to the approved design. Please let me know if there are any questions regarding this letter or the <br /> revised drawings, thanks. <br /> Sincerely, <br /> � C <br /> Jesse Jarrell, P.E. <br /> Project Manager <br /> RAIDSERVER\2011\111003A\ENG\Field Change Cover Letter <br /> _2h <br />