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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 . M2ZM 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 /24ch4ameter stainless steel tubes , sealed with TeflonTM 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) , diisopropylether ( DIPS ) , ethyl tertiary butyl ether ( ETBE) , tertiary amyl methyl ether (TAME) ; the lead scavengers ethylene dibromide ( EDB ) , 1 , 24chloroethane ( 1 , 2-DCA) , ethanol , and naphthalene using EPA Method 82608 , 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 (SEPE4) , 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 ,