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KLEINFELDER <br /> M3 BACKGROUND <br /> The Learner Company is a scrap metal recycling facility The Learner Company leases the <br /> Property from the Port of Stockton The site is currently in operation The access roads are dirt <br /> and gravel <br /> ' On August 2, 1996 two fiberglass underground storage tanks (USTs) containing diesel and <br /> gasoline were removed from the Learner facility One UST had a 4,000-gallon capacity and one <br /> UST had a 10,000-gallon capacity Soil generated by removal activities was stockpiled adjacent <br /> to the tank excavation The excavation extended to a total depth of 14 feet below the ground <br /> surface During the course of the excavation activities, it was reported that groundwater seeped <br /> ' into the excavation <br /> According to a letter dated September 14, 2000, from Mr Harlin Knoll of PHS/EHD to The <br /> ' Learner Company, total extractable petroleum hydrocarbons as referenced to diesel (TPH-d) was <br /> reported in soil as high as 3,800 parts per million (milligrams per kilogram or mg/Kg) Benzene <br /> was reported as high as 600 parts per billion (micrograms per kilogram or ug/Kg), and xylene <br /> ' was reported in soil as high as 1,600 ug/Kg in samples collected at the time of the tank removals <br /> Groundwater sampling results outlined in the letter from PHS/EHD mentions TPH-d as high as <br /> 4,300 parts per billion (micrograms per liter or ug/L) Total purgeable petroleum hydrocarbons <br /> as referenced to gasoline (TPH-g) were as high as 4 5 ug/L Benzene was reported at 80 ug/L <br /> and methyl tertiary butyl ether (MTBE) was as high as 3,200 ug/L <br /> Soil samples collected from the sidewalls of the UST excavation also contained petroleum <br /> t hydrocarbons Soil stockpiled from the excavation was also sampled, composited, and analyzed <br /> for TPH-d, TPH-g, and BTEX Stockpile samples (composite SP-1 through SP-3) were positive <br /> for TPH-d, TPH-g, xylene, and ethylbenzene <br /> The excavation was backfilled with 227 cubic yards of imported native soil, 93 cubic yards of <br /> impacted soil, and 53 cubic yards of imported aggregate base material <br />' On June 12, 1997, San Joaquin County Public Health Services Environmental Health Division <br /> (PHS/EHD) approved a workplan prepared by Clayton Environmental Consultants, Inc <br />' (Underground Storage Tank Site Investigation Workplan, June 1997, Project No 81-97016 00) <br /> to perform further site investigation <br />' 20-2322-05 EO1/2011R061 Page 3 of 14 <br /> Copyright 2001,Kleinfelder,Inc January 12,2001 <br />