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1 Prior to backfilling, the saturated bottom of the excavation was stabilized by placing a 4-foot thick rock base, consisting of 1- to 2-inch diameter rock, over a geotextile fabric liner The remainder of the excavation was then backfilled with clean fill dirt and compacted using construction equipment The backfill area was subsequently paved with asphalt cover Ground Water Monitoring and Extraction Event] Ground water samples were collected routinely from the five wells installed at Site #1 during the period from April 1991 through February 1995 These samples were analyzed for purgeable hydrocarbons and BTEX constituents Analyses during the earliest monitoring events ' also included organic and total lead and ethylene dzbromide The results of the analyses are presented in Section 4 The selected ground water remedial alternative for Former Tank Site #1 involved extraction of a fixed volume of hydrocarbon-containing ground water from existing monitoring wells Ground water was extracted from monitoring wells MW-4 and MW-5 during three events December 1993/January 1994, May 1994, and September 1994 The ground water extracted during each event was pumped into Baker tanks for temporary storage and subsequently transported via vacuum trucks to the City of Stockton Publicly-Owned Treatment Works (POTW) for direct discharge i Former Tank Site #2 i Activities performed at Former Tank Site #2, located at 1325 West ' Weber Avenue include • Removal of a 500-gallon fuel UST.)(1991); • Installation of soil borings and four monitoring wells for site characterization (1992), ' * Excavation of hydrocarbon-containing soils (1993), • Quarterly monitoring of ground water chemical quality during the period April 1992 to February 1995, and • Performance of three ground water extraction events during the period 1993 through 1994 A description of these activities is provided below 3-3