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Mr. Gurjinder Singh Sohal #3 February 28, 2019 - Page 3 PROJECT HISTORY In 1996 older vintage single-walled USTs, dispensers and associated product piping were removed and replaced by the existing fueling facilities. Based upon the results of soil samples collected from beneath the location of the former USTs, dispensers, and product piping an Unauthorized Release Report (URR) was issued and the responsible party (RP), Shell Oil Products, US, was required to perform site investigation and cleanup activities. Based upon the results of the soil sampling, groundwater monitoring, and remedial actions, the Central Valley Water Board, in its letter dated August 11, 2015, issued a no further action (NFA) determination (see Attachment 2 for a Summary of Previous Work). DISPENSER AND PIPING UPGRADE SOIL SAMPLING During February 2019, the existing MPDs and piping was removed. MR-I was contracted to provide a California Professional Geologist to collect 20 soil samples on February 13 and 19, 2019 at the direction of Ms. Elena Manzo with the SJCEHD from beneath the locations of the former MPDs and product and vent piping as well as sample from a five cubic yard stockpile of excavated soil (see Figure 2 for the sample locations). All sampling equipment was washed with a non-phosphate cleanser, pre-rinsed with tap water, and finally rinsed with deionized water prior to sampling. The soil samples were stored in 1 1/2-inch-diameter stainless steel tubes, sealed with Teflon TM liners and end caps, labeled, placed in an ice chest at a temperature of less than 4°C, and transported to a California State-certified laboratory for analysis. Sample identification and chain-of-custody procedures were followed for the samples to ensure sample integrity and to document sample possession from the time of collection to the ultimate destination. The sample labels identified the job number, sampler, date and time of collection, and a sample number unique to each sample. The soil samples were analyzed at BC Laboratories, Inc. (BC Labs) for total petroleum hydrocarbons (TPH) as gasoline using Environmental Protection Agency (EPA) Method 8015M; benzene, toluene, ethylbenzene, and xylenes (BTEX) the fuel oxygenate methyl tertiary butyl ether (MTBE), tertiary butyl alcohol (TBA), diisopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME); the lead scavengers ethylene dibromide (EDB), 1,2-dichloroethane (1,2-DCA), ethanol, and naphthalene using EPA Method 8260B, and total lead using EPA Method 6010B. TPH as gasoline was detected in only one of the 20 soil samples collected beneath the MPDs and piping at a trace concentration of 0.56 milligrams/kilogram (mg/kg) in the sample collected from beneath the southeast piping elbow (SEPE-4), as well as a trace concentration of 0.26 mg/kg in the stockpile sample (SP). Toluene, ethylbenzene, and xylenes were also detected at trace concentrations of 0.019, 0.0084,