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Ak DRAFT CLEANUP AND ABATEMENT ORDER R5-2012-XXXX RALPH LEE WHITE AND PETER BUI -5- 2122 SOUTH AIRPORT WAY,SAN JOAQUIN COUNTY feet of ground surface in a grid pattern across the identified hydrocarbon plume. To optimize detecting and delineating the extent of hydrocarbon vapors in soil, the grid spacing should include biased sampling locations (e. g., additional sampling locations near the former USTs, piping runs, estimated plume boundaries, and all nearby structures). The requested soil vapor survey should be prepared in accordance with the 28 January 2003 Advisory—Active Soil Gas Investigations, which is available from the website below. http://www.dtsc.ca.gov/lawsregspolicies/policies/SiteCleanup/upio R_ADV activesoilgasinvst.pdf The Soil Vapor Investigation Work Plan must also co at es outlining the depth and analytical results of every soil sample ever obtawe rom be -the Site, along with a map depicting the location of each sample. So' pies collect an area that was later excavated and removed are to be n long with the dat soil was removed from the subsurface. 5. Submit a Soil Vapor Report documenting the Its o oil vapor investi tion along with the results of a Human Health Risk Assess A) by 15 February:2013. The HHRA shall evaluate the risk all r al constitue maining in soil and soil vapor beneath the Site may pose to hu The`H hall estimate baseline carcinogenic risk and baseline toxi e sidentiptors, evaluating dermal absorption, ingestion, and volatilizat o in, xpos athways. All constituent concentrations detected " oil within' top ou , surface shall be considered when eve dermal n an tion, and soil vapor data shall be considered wh IYu I r volati n to indoor air. A ane-in-a=million target risk level and a targ and in de one are e used. Additionally, the unit risk factors and/or slope fa for all co ents inc` ated into the HHRA must comply with the values listed in th ce of tal h Hazard Assessment's (®EHHA`s) Toxicity Cr eria Dat all also be incorporated into the HHRA, which omp o that it can djusted easily and inexpensively as new Sit eco ila 6. 1 December 2 atter SJCEHD, approval and directive to conduct additional inv tion in order t' millet e delineation of the contaminant plume which was never ucted. As s the additional investigative work is to be conducted as approve he SJCE nd a report of the results submitted by 30 January 2013. A copy of the al S D approval letter and the approved work plan can be found at: htt :/1 eotrac ards.ca.gov/ rofile report.as ?global id=T0607700816. Also include a Sensit ceptor Survey (SRS) with a table and map of all water supply wells located within 2,00r radius of the Site and a Site Conceptual Model (SCM) including geologic cross-sections of the contaminants and plume maps, per the State Board Low Threat Closure Policy. 7. Submit a Feasibility Study that evaluates at least viable cost-effective three remedial technologies by 15 March 2013. The Feasibility Study must include conclusions and recommendations selecting one remedial alternative to be addressed in detail in the to- be-submitted CAP (see next item).