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FROM Ground Zero A a.l ysi sPHONE ND. 209 38 9883 Feb. 15 2000 04'54PM 04 C) Mr.Harlin Knoll February 1.5,2000 Page 3 of 4 the farmer USTs to the south, and west. Residual c ntamination in the soil appears to artcmWe rapidly, as no contamination was detected in any soil samphes collected from 15 feet bgs or below. An estimated 1,300 cubic yards of,soil between the depths of approximately 6 and 13 feet bgs has been impacted beneath the site. The estimated area of soil contamination is shown on Figure:l. 3.2 Groundwater Contamination Groundvvver beneath the affected soil has been it acted by petroleum hydrocarbons and the I oxygenated fuel additive MME. 'Me lateral extent.of shallow groundwater contamination beneath the site is largely defined to the north and the south,bu has not been fully defined to the west or the east. The estimated extent of dissolved petroleum iydrocarbon constituents in guundwatter is shown on Figure 4. i 4.0 AVE REPLAN i We propose using an excavator to remove residual sail contamination flrorn the approximate arm i depicted on Figure 3. Excavation will continue laterally until field evidence indicates that the majority of contaminated soil has been removed. Excavation will proceed"vertically to an estimated depth of.approximately 13 feet. i Soil excavation wilt be performed by Oil Equipment Service, a Division of Keith A_ Talllia, Inc_ Ground Zero anticipates that approximately 1,104 cubio yards of clean overburden sail will be removed prior to excavating contaminated soil. The clean soil will be nockpiled sedately from the contaminated soil and confirmation soil samples will be collected at a frequency of one 2:1 composite sample per 100 cubic yards of excavated goil. Docamented clean sail will be utilized as backfill. The anticipated stockpiling location is shown on Figure 5. I i Approximately 1,300 cubic yards of contaminated soil is expected to be removed. The contaminated soil will be temporarily stockpiled on s" a on 6-mil plastic sheeting and confirmation soil samples will be collected at a frequency of one :1 composite sample per 100 cubic yards of .excavated soil_ Contaminated sail will be aerated i nder a permit for uncontrolled soil aeration issued by the San Joaquin Valley Unified Air Polluti n Cord-rol District(APCD). The anticipated p area for sail aeration is shown on Figure 5. i Ground Zero anticipates collecting 12 ctionfirmation 1 samples from the sydewalls and floor of the excavation to document the removal of impacted soil_ In addition,one groundwater sample will be � collected from the excavation pit. Samples will be ans lyzed for benzene,toluene,ethylberizene, and xylenes (BTEX) using EPA method 8020, total pemileum Hydrocarbons as gasoline MHO) and diesel(TPI'lD)using EFA 13015 modified,and gasp iri oxygenate additives using EPA 8260. Upon completion of the excavation,Oil Equipment St trvice will line the bottom and the sides ofthe excavation with T'ypar filter fabric prior to bac Bing the excavation with crushed rock to -approximately one foot above the static groundwater level_ Another layer of fabric will be placed :on top of the crushed rock prior to placing and mechanically compacting; the remainder of the G:OatalGROUNDZEWANSER1hE—2Vntcdmwp.4w j