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Pacific Gas and Electric Company wide trench being dug along a 36 inch pipeline , the centerline of the trench would need to be at least 54 inches [ 24 /2 + 24 + 36 /2 = 54 ] away , or be entirely dug by hand . ) Water jetting to assist vacuum excavating must be limited to 1000 psig and directed at a 40 ° angle to the pipe . All pile driving must be kept a minimum of 3 feet away . Any plans to expose and support a PG & E gas transmission pipeline across an open excavation need to be approved by PG & E Pipeline Services in writing PRIOR to performing the work . 6 . Boring /Trench less Installations : PG & E Pipeline Services must review and approve all plans to bore across or parallel to (within 10 feet) a gas transmission pipeline . There are stringent criteria to pothole the gas transmission facility at regular intervals for all parallel bore installations . For bore paths that cross gas transmission pipelines perpendicularly , the pipeline must be potholed a minimum of 2 feet in the horizontal direction of the bore path and a minimum of 24 inches in the vertical direction from the bottom of the pipe with minimum clearances measured from the edge of the pipe in both directions . Standby personnel must watch the locator trace ( and every ream pass ) the path of the bore as it approaches the pipeline and visually monitor the pothole (with the exposed transmission pipe ) as the bore traverses the pipeline to ensure adequate clearance with the pipeline . The pothole width must account for the inaccuracy of the locating equipment . 7 . Substructures : All utility crossings of a gas pipeline should be made as close to perpendicular as feasible ( 900 + /. 15 ° ) . All utility lines crossing the gas pipeline must have a minimum of 24 inches of separation from the gas pipeline . Parallel utilities , pole bases , water line ` kicker blocks ' , storm drain inlets , water meters , valves , back pressure devices or other utility substructures are not allowed in the PG & E gas pipeline easement . If previously retired PG & E facilities are in conflict with proposed substructures , PG & E must verify they are safe prior to removal . This includes verification testing of the contents of the facilities , as well as environmental testing of the coating and internal surfaces . Timelines for PG & E completion of this verification will vary depending on the type and location of facilities in conflict . 8 . Structures : No structures are to be built within the PG & E gas pipeline easement . This includes buildings , retaining walls , fences , decks , patios , carports , septic tanks , storage sheds , tanks , loading ramps , or any structure that could limit PG & E ' s ability to access its facilities . 9 . Fencing : Permanent fencing is not allowed within PG & E easements except for perpendicular crossings which must include a 16 foot wide gate for vehicular access . Gates will be secured with PG & E corporation locks . 10 . Landscaping : Landscaping must be designed to allow PG & E to access the pipeline for maintenance and not interfere with pipeline coatings or other cathodic protection systems . No trees , shrubs , brush , vines , and other vegetation may be planted within the easement area . Only those plants , ground covers , grasses , flowers , and low- growing plants that grow unsupported to a maximum of four feet (4 ' ) in height at maturity may be planted within the easement area . PG & E Gas and Electric Facilities Page 3 Public