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"ir' 1 ^a xv.a�nwv 'Ct k Clayton CO%5I't TA,T$ Because of the shallow groundwater at the site, the regulatory levels established in the LUFT Manual did not apply. Before Clayton commenced excavation, we submitted a work plan for excavation and aeration of the gasoline-contaminated soil to the SJC/EHD an June 12, 1990. This plan was approved by Ms. Diane Hinson of the SJC/EHD. Clayton completed excavation and onsite aeration of approximately 1.,650 cubic yards of soil as documented in our report, So;l Excavation and Aeration for Interland Corporation, dated October 19, 1990. On October 29, 1990, Clayton sent an Addendum to Soil Excavation and Aeration RepcK Dated October 19, 1990 These reports were sent to the appropriate regulatory agencies and are summarized in the following subsections. 4.1 EXCAVATION AND SAMPLING j Soil excavation started on July 23, 1990, near the gasoline island concrete pad, which was still in place, Fuel Oil Polishing Company excavated the soil using a Case excavator, a 12-yard dump truck, E;;id a Case 450 truck loader, Clayton monitored excavated soils with an aranic vapor meter (OVM). 4.1.1 initial Excavation Clayton monitored excavation to approximately 10.5 feet. The soil at 10,5 feet appeared to be free of contamination based on visual observations and readings from -•-,� the OVM. At 10.5 feet the water table was visible in some spots, although it was not # � continuous. Initially, approximately 1,000 cubic yards of soil were ..xcavated. We collected seven I . soil samples from the base of the walls Of .the excavation and one water sample on'the `l following dates: 7 Jul 3. 1990: . . SW-1 and SE-1 • Jul ?_y .6, 1gg0: MW-1;NW-,'; MN-1,NE-1, ME-1, and H,_0-1 The soil samples were analyzed by the following methods: EPA Method 5030/8015-8020,for gasoline and BTEC EPA Method 418,1; for total recoverable petroleum hydrocarbons as oil and grrase r The water sample was analyzed by EPA Method 418.1 only, 1 - -- r Figure 3 prides a sample'lcrcatiou diagram. Table 4 is a s results, Notable results are listed below. . ummary of the analytical r Concentrations`of petroleum hydrocarbons from the southern and western sides o -' the excavation'(SW-1; SE 1, MW-1, and NW-1)were below the remedial objectives. I E • C91;centrahons of petroleum hydrocarbons from the nort f4�n and eastern walls of the excavatio n were above the remedial objectives. y. 1;_. - x