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. ` ` ` . - 2 - Administration Code. Our Site Plan by Arnold O' Sheridan Inc. , Consulting Engineers dated 8-3-92. His review of the very strict Town of Cottage Blasting Ordinance 385. 19 dated October 20, 1986 he wrote his 5 page report which is attached for your information . To summarize, if I may , the rather detailed report. The f " particle velocity of ground motion value o pea k groun d pa " 1 (PPV) is generally described as the vibration characteristic which can be used to best define the probability of bast vibration damage . The two factors which most influence the vibration intensity at a structure are 1 . The maximum amount of explosive detonated per delay interval within the blast. 2. The distance between the blast and the structure under consideration . Mr. Sobie indicated that on some pipeline projects that a limiting valve PPV of 5.0 to 7 .0 inches per second was applicable to pipeline safety . He also stated , quote, " It may be of interest to note that SAFE blasting can be and is routinely conducted in close proximity to high pressure buried pipelines. Literally, miles of bedrock has been blasted to accommodate new pipeline installation on easement and pipeline right of way which contain in service, fully operational , existing pipelines which parallel the new line being emplaced . Our office has routinely monitored quarry blasting operations located relatively close to existing , in service pipelines. At the present time a client of ours operates a quarry in the City of Rockford , Illinois. The quarry operation excavation has developed along a line which parallels an existing in service buried pipeline. The quarry bench is about 50 feet in height; the operational width is in excess of 1200 feet , which closely parallels the pipeline. The blasting operations have consistently approached separation distances of about 50 feet from the pipeline. This quarry has been in regular operation for over 23 years and represents an example of quarry blasting being conducted in relatively close proximity to a pipeline. In our opinion , as related to pipeline integrity , a PPV of 2.0 inches per second , would represent a very conservative and SAFE vibration limit. It should also be recognized that seismographic tests conducted to monitor blast vibrations at the pipeline could also be useful in . documenting conformance to applicable requirements in , ILHR7 in addition to providing vibration data useful in determining ground vibration intensity at other local structures which may be of interest . In our opinion , limiting the PPV at the South Property line to 2.0 inches