bituminous pavement on a 150-foot by 600-foot parkinglot. The unit weight (which usually ranges from 140 to160 pcf) should be determined from laboratory testingwhen possible; however, when the unit weight is notknown, an estimated weight of 160 pcf maybe used. Inthis example, let’s assume a unit weight of 147 pcf. Fromthis, we can estimate the tons of plant mix required bysubstitution into the above formula as follows:600 x 150 x 2 x 147= 1,102.5 tons.12 x 2000Then if we include a loss factor of, let’s say 5 percent,we will need 1,158 tons of plant mix for this parking lot.Now, let’s assume that this same parking lot is to belaid over a compacted-soil subbase. In this case, we willneed a prime coat also. The prime coat is a low-viscosityliquid bitumen that is sprayed on the subbase. It providesa seal and promotes adhesion between the subbase andthe pavement. To estimate the amount of bitumenrequired for the prime coat, multiply the area to betreated by the rate of application The estimate shouldinclude enough bitumen for an additional width of 1 footon each side of the pavement. A formula for estimatingthe number of gallons of primer needed is as follows:Where:L =W =AR =Gallons =L x W x A R9Length of paved area in feetWidth of paved area in feetApplication rate of bitumens in gallonsper square yardSo, if the project specs for the parking lot we havebeen discussing call for an application rate of 0.3 gallonsof prime coat per square yard of surface and if weassume a 5 percent loss factor, how many gallons ofprimer will be required? You can try this one on yourown.ADVANCED BASE PLANNINGDuring World War II when bases were constructedacross the island chains of the Pacific Ocean, it becameapparent that significant savings in both time andmaterial could be realized if units of materials,equipment, and personnel required to perform specificfunctions were standardized. This was the beginning ofthe Advanced Base Functional Components (ABFC)System that is still in use today. In this section we willbriefly discuss the ABFC System and the FacilitiesPlanning Guide, NAVFAC P437.ADVANCED BASE FUNCTIONALCOMPONENTS SYSTEMA thorough discussion of the Advanced BaseFunctional Components System may be found in theNaval Construction Force (NCF) Manual, NAVFACP-315, and in volume II of the Facilities PlanningGuide, NAVFAC P-437. Briefly, however, the overallABFC System comprises a preplanned collection ofindividual functional components, each of which isdesigned and organized to perform a specific functionat an advanced base. These functional components aregiven code numbers and names to indicate theirfunction; for example, Component P-26 is a SeabeeTeam, and Component N-24A is a 750-man tent camp.By using the ABFC System, planners for logistics,facilities, and construction can readily identify theequipment, facilities, materials, construction effort, andother pertinent information that is needed for eachcomponent. The basic document that identifies all of thisdata is the NAVFAC P-437.NAVFAC P-437The Facilities Planning Guide, NAVFAC P-437, isthe basic tool that you should consult when tasked toassist in planning the construction of an advanced base.This document identifies the structures and supportingutilities of the Navy ABFC System. It was developed tomake preengineered facility designs and correspondingmaterial lists available to planners at all levels. Whilethese designs relate primarily to expected needs atadvanced bases and to the Navy ABFC System, they canalso be used to satisfy peacetime requirements.Facilities, logistic, and construction planners will eachfind the information required to select and document thematerial necessary to construct facilities.NAVFAC P437 consists of two volumes. Althoughit may seem unusual to do so, let’s first discussvolume II.Volume IIVolume II of the P-437 is organized into three parts.Part 1 (Components) contains data displays foreachofthe ABFC components and is indexed by code number.These data displays list and describe the facilities thatmake up each ABFC component. Figure 5-3 is an5-8