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Work Plan for Underground Storage,Tank Rcmo.vaI'.= Unocal Service Station No,t 5421, Stockton, California p <br /> December 12, 1997 <br /> _ The objectives in performing the scope of work are: r ; <br /> • To remove existing,underground:facilities, and, <br /> • To address areas of petroleum hydrocarbon-impacted soils using limited overexcavation..or other ' <' <br /> appropriate methods based on the concentrations`encountered. • `;. <br /> Site Safety Plan <br /> As required by the Occupational Health and Safety Administration(OSHA)"Hazardous Waste Operations'. . <br /> and,Emergency Response" guidelines (29 CFR 1910.120); and by California Occupational Health and <br /> Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines <br /> (CCR Title 8, Section 5192),.GST has,prepared a Site Safety Plan {attached).. .This Plan will be reviewed <br /> ` by the field staff and contra tors -iditiating field operations a <br /> tors prior to tthe"site. <br /> Soil Sampling Activities. r• "' <br /> a GSI representative will be on-site,to,observe removal of.the USTs and <br /> During the scheduled activities, <br /> * >. other underground facilities, and to-collect soil•samples. Upon removal of the--underground equipment,-' <br /> the GSI representative will collect soil samples in accordance with SJCEHO requirements.' The samples <br /> will be submitted, under 'chain-of-custody documentation to a California State-certifed :analytical _ <br /> laboratory for analysis a&d_escribed.below <br /> Management of Excavated. Soil and Limited Overexcavation � 40 y <br /> If petroleum hydrocarbon-impacted soils are encountered, limited overexcavatton'may be,Jperformed."' <br /> Overexcavation-wouldbe1itnited to a maximum of 400 cubic-yards of,soil :Upon,ekcavation,':the soil :. , <br /> -: will be stockpiled on-site,irf segregated piles and c6v red:with plastic`sheeting. Stockpiled soil will be' <br /> sampled for disposal characterization on,a•four-point•composite sample per �100.cubic:yard_basis. The . <br /> k, soils will then be transported to-an approved-landfill for disposal; 'Wiih'the'permtsston-of SJCEHD, cleanj. <br /> ' " <br /> 4 stockpiled soil may be reused as fill": <br /> } <br /> Y <br /> 'Analytical.Uboratory Procedures <br /> i Soil samples collected duringgasoline'UST and product'line removal activities will be submitted Obi they ; <br /> laboratory and analyzed for total petroleum hydrocarbons as gasoline:{'I'PHg}..by EPA Method 8015 , <br /> (Modified), and benzene;toluene ethlbenzene and xylenes (BTEX) and`methyl tent.-but l ether MTBE <br /> by EPA Method 8020. In addition; one selected soil sample collected,from the beneath the gasoline UST. <br /> or product lines will be analyzed for total lead,by:EPA Method 6010 andfuel oxygenates-by EPA Method f <br /> 8260. _ x' fi ! + ✓ Y <br /> Soil samples collected from beneath the,waste oil-UST and*sandlwater separator"will,be analyzed for <br /> TPHg, BTEX, MTBE, total petroleum hydrocarbons as dieseI.(TPHd)by EPA Method-8015{Modifiedy,, <br />