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emergencies , and have available at all times competent workmen for the operation of the pumping equipment . The dewatering systems shall not be shut down between shifts , on holidays , or weekends , or during work stoppages . Pumps and engines for well point and other dewatering systems shall be operated with mufflers and at a minimum noise level suitable for a residential area . C . The control of groundwater shall be such that softening of the bottom of excavations , or formation of "quick" conditions or "boils " are prevented . Dewatering systems shall be designed and operated so as to prevent the removal of natural soils . The static water level shall be drawn down below the bottom of the excavation so as to maintain a dry working surface and to maintain the undisturbed state of the natural soils and to allow the placement of any fill or backfill to the required density. For structures , the groundwater table shall be lowered to at least two (2 ) feet below the maximum excavation depth . D . While dewatering for new construction in the vicinity of existing structures , depletion of the groundwater level underneath these existing structures may cause settlement . To avoid this settlement , the groundwater level under these structures shall be maintained . E . The release of groundwater to its static level shall be performed in such a ' manner as to maintain the undisturbed state of the natural foundation soils , prevent disturbance of compacted fill or backfill , and prevent flotation or movement of all structures , pipelines and sewers . F . Well point holes shall be completely filled with clean sand or grout at the time the points are pulled . If necessary , a rod or vibrator shall be used to prevent bridging of the backfill . G . Comply with Section 02225 — " Erosion Control and Treatment of Dewatering Water and Stormwater Runoff From the Construction Site . " 3 . 3 EXCAVATION IA . Perform all excavation required to complete the Work . Where it is necessary to cut roots projecting into an excavation or to trim branches for requipment clearance , all cut ends over 1 /2" diameter shall be treated with an asphalt based pruning paint . ' B . The elevation of the bottom of footings shown shall be considered as approximate only and ENGINEER may order such changes in dimensions Last revised 9/ 10/02 02220-7 EAST GIFFORD F:\Public WorksWeithM\Stormmater Projects\Gfford East\Construction Contract\Technical Specifications\Fnal Specifications\Division 2\02220 - Excavation and Backill .doc