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Wright Environmental Services, Inc. �t�ry September 9, 2008 San Joaquin County, Environmental I Iealth Department Site Mitigation, Unit W 600 East Main Street Stockton, CA 95202 ATTN: Ms. Margaret Lagorio Re: Contingency Plan -Soil Excavation 8650 Almendra Way, Tracy, CA 95376 Dear Ms. Lagorio, 2395 East Pescadero Avenue Tracy CA 95304 209-833-0758 Fax 209-832-5152 Wright Environmental Services, Inc. (Wright) has prepared this Contingency Plan to excavate soil that may be contaminated with petroleum hydrocarbons (motor vehicle fuels) for the above referenced site where two (2) underground storage tanks approximately 1000 -gallons each will be removed under oversight of the UST Unit, permit No. SR 0055267.. Summary The site has several constraining objects in the vicinity of recently discovered underground storage tanks (UST) located near the western property line below a 10 X 10 wooden shed (fuel shed). Portland Cement Concrete (PCC) slabs surround three sides of shed; and to the east, Asphalt Concrete (AC) forms the paved area leading to a dwelling with a three car garage. The west ends of both USTs are suspected to be within 5 to 10 -feet of the western property line that is distinguished by an 8 -foot tall wooden fence. The fuel shed will be demolished prior to UST closure. Concrete underlying the shed will be removed to access soil surrounding the UST's. In the event contamination is observed or suspected as a result of either UST system present; Wright and owner propose to excavate additional soil surrounding and below the UST's to remove contaminated soil in a limited area. This contingency plan is an enhancement to the standard UST removal operation identified in the "Application For Underground Storage Tank Closure Permit" (Closure Permit) and is intended to be implemented during UST closure activities and therefore is limited in its scope and not intended to initiate assessment or remedial activities. However, should the limited over excavation work proposed and the subsequent soil and or groundwater sampling (if present) of the area excavated indicated no detectable petroleum hydrocarbons present, then Wright and Owner would submit all field data in the UST Closure Report and request EHD to conclude that no further assessment or remedial action(s) be required for the property.