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Table 2Soil Vapor Analytical Results – 2020 and 2022Additional Site Assessment Report and Human Health Risk Screening EvaluationSurland HomesTracy, CaliforniaTPH-g2,2,4-Trimethyl-pentane2-Butanone (Methyl Ethyl Ketone2-Propanol Acetone BenzeneCarbon TetrachlorideChloroform Chloromethane Cyclohexane Ethanol Freon 11 Freon 113 Freon 12 HexaneMethylene ChlorideOxygen Nitrogen MethaneCarbon DioxideHelium5 1/13/2020140,000 -- -- -- --<1.0-- -- -- -- -- -- -- -- -- -- 3.6 96 0.040 0.78<0.168 1/13/202014,000,000 -- -- -- --<120-- -- -- -- -- -- -- -- -- -- 0.85 9.3 80 9.8<0.11B-16 5 4/18/2022 --72 50 26 J 50 J 2.1 J<13 <10 <2210 J<59 <12 <16 <52 <372.9 J 21--0.19 0.098<0.10DUP-1 5 4/18/2022 --21 39 130 170 0.63 J 0.50 J 0.28 J 1.4 J 2.1 J 62 1.4 0.46 J 2.7 J 0.86 J 2.0 21--0.045 0.054<0.10-- -- -- -- -- 85 -- -- -- -- -- -- -- -- -- -- -- -- -- -- ---- -- -- -- -- 85,000 -- -- -- -- -- -- -- -- -- -- -- -- -- -- ---- -- -- -- -- 3.2 16 4.1 -- -- -- -- -- -- -- 34 -- -- -- -- --20,000* -- 170,000 -- 1,100,000 100 1,400 3,400 3,100 -- -- -- -- -- -- 14,000 -- -- -- -- --Notes:Qualifier:1. Table only includes detected VOCs.J = The reported value is an estimate2. Detections are in boldDetection exceeds the SFBRWQCB noncancer ESL.References:DTSC. 2021. Technical Aspects of Vapor Intrusion Evaluations at California Sites, 30th Annual International Conference on Soil, Water, Energy, and Air. Rafat Abbasi, P.E. Dan Gallagher, P.G. William Bosan, PhD.Abbreviations and Acronyms:SFBRWQCB. 2019. Environmental Screening Levels, San Francisco, CA. SWRCB. 2012. Low-Threat Underground Storage Tank Case Closure Policy. August 17.µg/mg3 = microgram per cubic meter% = percent< = analyte not detected above the laboratory reporting limits-- = not applicablebgs = below ground surfaceDTSC = Department of Toxic Substances ControlESL = environmental screening level (SFBRWQCB 2019)ID = IdentificationLTCP = Low-Threat Underground Storage Tank Case Closure Policy (SWRCB 2012)SFBRWQCB = San Francisco Bay Regional Water Quality Control BoardSL = screening levelSWRCB = State Water Resources Control BoardTPH-g = total petroleum hydrocarbons as gasolineVOC = volatile organic compound* The ESL was generated using a default attenuation factor of 0.03. The DTSC published a draft document recommending a 0.005 attenuation factor (DTSC 2021), which would change the TPH-g ESL to 120,000 µg/m3 if it is accepted.SFBRWQCB Residential ESL (noncancer)SFBRWQCB Residential ESL (cancer)B-13%Sample IDSample Depth(feet bgs)Sample Dateµg/mg3LTCP Residential SL (bioattenuation zone)LTCP Residential SL (no bioattenuation zone)1/1