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unlabeled green box presumed to be associated with the fiber optic lines along Grant Line Road; and signage for one petroleum and two gas pipelines crossing under Grant Line Road just east of the Alameda-San Joaquin County line. Pipelines Two utility corridors that contain underground pipelines are located in and around the project site(Figure 4.9-3).These include the following: L Corridor#1: A combined PG&E—Chevron 65-foot wide easement trending from northwest to southeast across the project site.This easement contains a PG&E 36-inch natural gas pipeline (Pipeline 1401) operating at a pressure of 1,040 pounds per square inch gage(psig), a PG&E 26-inch L natural gas pipeline(Pipeline L002)operating at a pressure of 890 psig,and a Chevron 18-inch crude oil pipeline(Pipeline CSFM 0499). Corridor#2: Two PG&E easements along the west side of Mountain House Parkway.These easements contain a PG&E 10.75-inch natural gas pipeline(Pipeline L162A)operating at a pressure of 365 psig,and a PG&E 6.625-inch natural gas pipeline(Pipeline L176)operating at a pressure of 365 psig. i All four natural gas lines are constructed of welded steel with cathodic protection systems, and the crude oil pipeline is constructed of welded carbon steel.Pipelines L401 and Ll 62A currently have a Class 2 location designation which is defined as a pipeline that has more than 10 but fewer than 46 buildings intended for human occupancy within 220 yards along any continuous one mile length of the pipeline (generally,a suburban pipeline).Pipelines L002 and L176 currently have a Class 1 location designation which is defined as a pipeline that has 10 or fewer buildings intended for human occupancy within 220 yards along any continuous one mile length of pipeline(generally, a rural pipeline). In the current cases, the class designations reflect differences between where the pipelines are routed(i.e.,more versus less congested areas)rather than any difference in the type and construction of the pipelines. In order for College Park to proceed, all pipelines would need to be re-designated to Class 3 pipelines. hi accordance with Code of Federal Regulations(CFR)49 Part 192.609 and 192.611,PG&E will be ` required to conduct a technical study to support the change in class location designations for pipelines 1401 and L002,since they operate at a hoop stress greater than 40% SMYS. If results of the technical study indicate that existing pipeline construction and operating pressure cannot support a change to Class 3 designation, a reduction in operating pressure or pipeline construction upgrade could be required.This would reduce the estimated level of individual risk at varying distances from the pipeline. As indicated above, Class 3 locations require a greater amount of cover than Class 2 locations.The need for any additional cover in the project area should be addressed as part of the PG&E technical study that will be required to support the change in class location designations for pipelines L401 and L002. A search of government databases did not reveal any incidents associated with the above pipelines in the vicinity of the project site.As indicated under"Results of the Historical Review,"there was an incident involving the Chevron crude oil pipeline immediately southeast of the project site in December 2003.1 ` The pipelines could represent a potential leak or explosion hazard at the project site. The Chevron crude oil pipeline did not appear in the database search because the search was conducted before the December 2003 incident. College Park at Mountain House Specific Plan III Draft EIR EDAW San Joaquin County 4.9-11 Public Health and Safety