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lz/03/01 17:48 FAX f103 i i' 10, 8020. 8260 and 61,')40B r2specti��ely. Once Wris�l�t obtains the analytical results they will be forwarded onto the City of Tracy and PHS-EHD. 4 Technical ,approach The technical approach to this project is to build upon the field data collected during tank removal and sampling m ork in addition to comply with PHS-EHD requirements. Since the UST tank is removed and the pit remams open Wright will conduct further assessment of the tans: pit area in an attempt to minimize future impacts to the new parking lot as required by the City of Tracy- a cleanup €:liort hili be made in the tank pit area it)'.remov�e contarninated soil while the 1 pt area is open as directed b% City officials. PHS-EHD has informed Wright that oversight for € these tasks t.ill till under their oversiglzt. On the basis of the data collected in the tank pit, the interim rerhediation and subsurface soil C assessment trill be enlar{,ed as needed to delineate the contaminants in soil. PHS-EHD would provide oversiglii for subsui-face soil interim remediation. This proposed work discussed below takes an expedited approach ibr- the subsurface assessment to attempt to delineate and remediate the subsurface soil contamination quickly. Scope of NVork i Task 1. Field Methods - Tabak l'it Area Task l. 1 Soil_Assessment Sampling and Contaminated Soil Removal The area of the 3ormer tank pit will be assessed when the area is opened (Figure 1) A utility clearance «-111 be periorrtled prior to starting the fieldwork'. Once the surface is opened soil samples k4111 be collected in tyre pit_. at the pit perimeter and base. Areas of•obvious or suspected contaminated soil will be rernodN-ed to the extent feasible within the k constraints of the pit.. utilities and pit gall stability. :all excavation and sampling_, equipment and sampling tools \gill be cleaned prior to arriving, and befoie leaving the site. Hie sampling equipment %will be advanced to the desired sampling depth interval, or soil will be excavated and brought to the surface by the excavator_ if the excavator isiused, approximately two inches of soil iAill be brr_lshed away and the sampler ring will be driven into the soil. The sampler will be equipped with a clef+n brass liner for each sample The soil filled liners retained for chemical . analysis will be sealed v6th Teflon paper and plastic end caps, labeled, log sed onto chain-of- � custody- forms and placed in a chilled ice chest on crushed ice for transport to the laboratory. Contaminated soil will be either transported to Forward Landfill under a stockpile agreement for sampling and waste characterization prior to disposal or placed on and covered by plastic on-site and then sampled for proper ofi=site. disposal. Space constraints on-site will dictate which option is used A clean Backfill Ei elf l e placed into the excavated area and compacted prior' to resurfacin., the area. l 2