ARCHIVED REPORTS_2020 ADDITIONAL SITE ASSESS RPT

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TABLE 7 ANALYTICAL RESULTS OF SOIL SAMPLES: TPH, LEAD, DIOXIN/FURANS Former San Joaquin Cogeneration 17200 Murphy Parkway, Lathrop, California TPH-g TPH-d TPH-mo Lead (Pb)Dioxin-Furan* EPA Method 6020 (mg/kg) EPA Method 1613B TEQ: (pg/g)EPA Method 8021/8015B (mg/kg)DateSample ID Depth (Feet) B65-5 5 06/24/20 <1.0 4.9 12 -- B65-10 (Waste) 10 06/24/20 <1.0 2.4 12 -4.47 B65-15 15 06/24/20 33 1,100 6,100 -- B65-20 20 06/24/20 <1.0 <1.0 <5.0 -- B66-5 5 06/24/20 <1.0 560 1,200 -- B66-10 10 06/24/20 <1.0 <1.0 <5.0 -- B66-15 15 06/24/20 <1.0 <1.0 <5.0 -- B66-20 20 06/24/20 <1.0 <1.0 <5.0 -- B67-5 5 06/24/20 <1.0 1,000 1,900 -- B67-10 10 06/24/20 <1.0 <1.0 <5.0 -- B67-15 15 06/24/20 <1.0 <1.0 <5.0 -- B67-20 20 06/24/20 <1.0 <1.0 <5.0 -- B68-5 5 06/24/20 <1.0 58 200 -- B68-10 (Waste) 10 06/24/20 <1.0 4.2 9.6 -- B68-15 15 06/24/20 <1.0 <1.0 <5.0 -- B68-20 20 06/24/20 <1.0 <1.0 <5.0 -- B79-5 5 06/25/20 <1.0 <1.0 5.5 -- B79-10 10 06/25/20 <1.0 <1.0 <5.0 -- B79-15 15 06/25/20 <1.0 <1.0 <5.0 -- ---800 22 pg/g -500 18,000 320 - 2,000 1,200 180,000 380 22 pg/g 8,000 8,000 25,000 1,000 10,000 pg/g Notes: TPH-g/d/o: Total petroleum hydrocarbons quantified as gasoline/diesel/oil mg/kg: milligrams per kilogram pg/g:picograms per gram *:Dioxin/Furan analytical lab reports for samples collected in June 2020 are included in Appendix D which include Congeners detected and their reporting limits. TEQ: Total Toxic Equivalency <5/ND: not detected above laboratory reporting limit --:not analyzed B18-SL 1:Sample collected by regional water board staff -no established screening level EPA-RSL US EPA Region 9 - Regional Sreening Levels for industrial soil May 2020 DTSC-SL Department Toxic Substace Control (DTSC) HERO Note 3- Sreening Levels for commercial/industrial soil June 2020 ESL San Francisco Bay RWQCB Environmental Screening Levels-for commerical/industrial shallow soil exposure Jan. 2019 DTSC-SL ESL CA Hazardous Waste Limits EPA RSL