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' 16 February 1999 <br /> . AGE-NC Protect No 97-0290 <br />' Page 2 of 11 <br /> the Klamath Mountains in the north The western and eastern boundaries of this province are <br />' comprised of the California Coast Range and the Sierra Nevada, respectively The Great Valley <br /> Province is subdivided into two mayor divisions designated the Sacramento and San Joaquin Valleys <br /> According to the Geologic Map of California, published in 1977 by the State of California <br /> rDepartment of Mines and Geology, the subject site is underlain by Pleistocene and Holocene <br /> alluvium composed of unconsolidated to semi-consolidated alluvial,playa, lake and terrace deposits <br /> I <br /> 2 3 UNDERGROUND STORAGE TANK REMOVAL <br />' AGE has been informed that four USTs and one 55-gallon drum were removed from the site on 21 <br /> September 1987 by Jim Thorpe Oil The USTs ranged in volume from 250 to 2,000 gallons and were <br /> used to store gasoline and waste oil Petroleum hydrocarbons were detected in soil samples collected <br /> beneath the USTs at concentrations as high as 1,300 ppm <br /> 2 4 EXCAVATION OF HYDROCARBON-IMPACTED SOIL <br /> • On 25 February 1989 , impacted soil was excavated from the former UST area by Warren E Gomes, <br /> Inc of Rio Vista The excavation reportedly encompassed an area of approximately 40 feet by 40 <br /> feet and extended to a depth of approximately 22 feet below surface grade(bsg) The excavation was <br /> backfilled to grade with sandy loam <br /> On 13 October 198;1,6 soil was excavated at the southeast corner of the property to confirm the <br /> removal of impacted soil during the February 1989 excavation The second excavation adds essed <br /> an area approximately 8 feet by 12 feet and extended to a depth of 26 feet bsg One sample was <br /> collected from the second excavation Field observations indicated that petroleum-hydrocarbons <br /> were present in soil samples collected from the excavation Laboratory analyses of the soil samples <br /> were not available to AGE <br /> 25 ADVANCEMENT OF SOIL BORING, NOVEMBER 1989 <br /> One soil boringwas advanced to a depth of 40 feet bs at the site in Novembei 1989 Hydrocarbon <br /> p g Y <br /> odors were noted in the boring, however analysis of soil samples were not performed Drilling was <br /> aborted and the boring was backfilled with grout <br /> Advanced GcoEnnlronmental,Inc <br />