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Ms Margaret Lagono,SJCPHS September 28,2004
<br /> Dual Phase Extraction Test Re art
<br /> Joe's Truck Plaza,Lathrop, California
<br /> Page 2
<br /> 10,000-gallon UST, and one 4,000-gallon UST used to store gasoline, and one 4,000-
<br /> gallon UST used to store diesel The configuration of the facility is shown in Figure 2
<br /> The original facility configuration included two UST pits The northern former UST pit is
<br /> located to the west of the current UST pit, and formerly contained one 10,000-gallon
<br /> gasoline UST, and one 8,000-gallon and one 6,000-gallon diesel USTs The southern
<br /> farmer UST pit is located in the southeastern area of the site and formerly contained one
<br /> 12,000-gallon diesel UST
<br /> SITE BACKGROUND
<br /> Background information presented in this section is based on our review of the
<br /> documents prepared by Advanced GeoEnviron mental (AGI) and Avalon Environmental
<br /> Consultants (Avalon)
<br /> In January 1997, AGI advanced six soil bonngs in the vicinity of the northern and
<br /> southern tank pits, and one boring in the vicinity of former septic leach lines, collecting
<br /> soil and grab groundwater samples Total petroleum hydrocarbons as diesel (TPHD) was
<br /> reported in one of the soil samples collected from a depth of approximately 6 feet below
<br /> ground surface (bgs) near the southern tank pit at a concentration of 1,000 milligrams per
<br /> kilogram (mg/Kg) Dissolved TPHD, total petroleum hydrocarbons as gasoline (TPHG),
<br /> and methyl tertiary butyl ether (MTBE) were reported in groundwater samples collected
<br /> from borings near both tank pits at concentrations up to 320,000 micrograms per liter
<br /> (µg/L), 2,700 (µg/L), and 95 (µg/L), respectively
<br /> The USTs, product piping, and dispensers were replaced during site renovation activities
<br /> in February and October 1998 Avalon conducted compliance soil sampling for the
<br /> southern tank pit on February 23, 1998, and for the northern tank pit on October 9, 1998
<br /> TPHD, benzene, and MTBE were reported in compliance samples collected from a depth
<br /> of approximately 10 5 feet bgs at maximum concentrations of 660 mg/Kg, 0 88 mg/Kg,
<br /> and 0 46 mg/Kg, respectively The highest reported concentrations were found beneath
<br /> the northern tank pit
<br /> In November 1998, Avalon advanced fifteen soil borings in the vicinity of the former
<br /> northern (GP-1 through GP-7) and southern (GP-8 through GP-15) UST pits TPHD and
<br /> MTBE were reported in soil samples collected from a depth of approximately 9 feet bgs
<br /> at maximum concentrations of 200 mg/Kg and 0 064 mg/Kg, respectively TPHD,
<br /> benzene, and MTBE were reported in grab groundwater samples at maximum
<br /> concentrations of 11,000 pg/L, 16 µg/L, and 1,700 µg/L, respectively
<br /> In February 2000, Avalon installed six groundwater monitoring wells (MW-1 through
<br /> �1 MW-6) Depth to water beneath the site ranged from 6 24 to 7 26 feet bgs During this
<br /> site assessment study, TPHD, TPHG, benzene, and MTBE were reported at maximum
<br /> P Uoe s Truck P1aTa\Reports\DPF Test'Joes Truck DPE Test Report doc 5 7W W5
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