WORK PLANS - Laserfiche WebLink

Home Browse Search

Workplan for PFAS Sampling and Analysis Project Number:60657245 2. PFAS Storage and Usage History The Site PFAS storage and foam usage history were evaluated based on review of historical documents as well as interviews with relevant Marathon Petroleum Company (MPC) personnel. This data review showed that foam was stored at the Site as early as 2005. Detailed historical records with the quantities and types of foams used or stored at the Site are not available. However, based on the review of the documents from the Site and interviews with the facility staff,the following sections describe identified areas at the facility where foam may have been stored, handled, or used.The identified areas are shown on Figure 2-1 and Figure 2-2. 2.1 Storage and Handling Locations Storage and handling locations have been identified in order to form a basis for sampling locations. Currently, foam concentrate is stored in two tanks associated with two fixed foam systems and two 55-gallon drums as described in Section 2.1.1 and Section 2.1.2. Each storage location is described in detail below. Foam currently stored at both the West Terminal and East Annex is Solberg Arctic 3x3% and 3x3% CG ATC, an alcohol-resistant aqueous film forming foam (AR-AFFF). 2.1.1 Fixed Fire Suppression Systems Fixed fire suppression systems are those which are dedicated to a certain area (i.e., at a truck loading rack). These systems cannot readily be relocated. Fixed systems require annual testing per National Fire Protection Association (NFPA) requirements; however, testing is often completed by a third-party contractor and testing can be completed with water. Fixed System #1 (Storage S1)—Stockton West Terminal has a fixed foam system that provides direct protection to the truck rack and Tanks 35 and 55 since 2016, as well as Tanks 20 and 32 since 2018. The foam concentrate for the fixed system is an AR-AFFF supplied from a 1,000-gallon foam tank located southwest of the truck rack(Figure 2-1). Historical Fixed System#1 —At the Stockton West Terminal,there was a historical fixed foam system that was designed to provide fire protection by supplying foam solution to the truck rack from at least 2005 through 2016. A fixed foam system may have been present prior to 2005. The foam concentrates for the truck rack were contained in a 300-gallon foam tank. The foam tank was removed and properly disposed of off site in 2016. The historical system was installed where the existing Storage S1 is currently located. Fixed System#2 (Storage S2)—Stockton East Annex has a fixed foam system that provides direct protection to the railcar offloading rack. The system has been connected to the deluge system since 2016. The foam concentrate for the fixed system is an AR=AFFF supplied from a 600-gallon foam tank located southeast of the railcar offloading rack (Figure 2-2). 2.1.2 Foam Monitors Foam monitors may be connected to fixed foam storage or manually connected to semi-fixed foam storage(i.e.,drums, totes). A foam monitor is located at the truck loading rack at the East Annex. Foam to the East Annex foam monitor is supplied by the fixed foam tank(Storage S2)described in Section 2.1.1.There is no record of use of the monitor.A fire monitor is located at the East Annex and may be connected,via a stinger,to a 55-gallon drum of foam if needed. The drum storage is indicated on Figure 2-2 as Storage S3.There is no record of use of the fire monitor with foam. _.2 Potential Foam Usage Areas One foam use area was identified for the Site (Location U1). Foam was used at the truck rack at the West Terminal reportedly in 2005.The foam was discharged to the concrete pavement in the loading rack(Figure 2-1).The foam/water mixture was contained, as designed, within the rack containment drainage system, where it drained by pipe into the underground sump and was pumped to aboveground oily water Tank 420 for proper offsite transport and treatment. The concrete rack loading area, associated strip drains, piping, sumps, and piping that connects with Tank 420 are enclosed and not exposed to surrounding soils. Prepared for:Tesoro Logistics Operations LLC AECOM 7