Laserfiche WebLink
Stockton Charter Way Commingled Plume - 2 - 7 November 2024 <br /> Table 1 — Su mary of Recent Phase 2 Remediation Progress <br /> Average <br /> Screen <br /> TW <br /> Wells Target Interval Average Most recent al System Mass veryge D <br /> When ART <br /> Utilized Media Range Startup Removed Removal Rate DTW Wells <br /> (ft bgs) Installed in <br /> 2017A <br /> ART-1 <br /> through Vapor 3-16 <br /> ART-8 <br /> ART-2, Ground- <br /> ART-7, water 40-67 December <28 <0.099 11.84 14.18 <br /> ART-8 2021 Ibs TPHg Ibs/day TPHg ft bgs ft bgs <br /> ART-1, Ground- 58-80 <br /> ART-3 water <br /> ART-4, Ground- <br /> ART-5, water 98-118 <br /> ART-6 <br /> ART= Advanced Remediation Technology; DTW= depth to groundwater; ft bgs= feet below <br /> ground surface; Ibs= pounds; TPHg= total petroleum hydrocarbons; <br /> A ART wells installed in February and March 2017. DTW data is from April 2017. <br /> Table 2 — Summary of May 2024 Maximum Groundwater Concentrations <br /> No. of Screen <br /> Depth No. of Wells Interval TPHg B T E X MTBE TBA <br /> Zone Wells Sampled Range <br /> in 2Q24 (ft bgs) ug/L) ug/L (ug/L) (ug/L) ug/L) (ug/L) (ug/L) <br /> A 21 9 10-40 1,720 1,050 15.4 120 75.7 38.8 90.8 <br /> B' 25 20 30-65 3,570 20.8 14.5 18.6 18.6 7.87 389 <br /> C 15 14 58-90 1,570 20.7 3.95 <3 17.4 1,740 348 <br /> D 16 12 98-125 750 6.32 3.02 <1 23.9 330 115 <br /> E 1 1 137-150 <100 <1 <1 <1 <3 <1 <10 <br /> Water Quality Objectives 50 1.0 150 300 1,750 13 12 <br /> LTCP Thresholds2 -- 1,000 -- -- -- 1,000 -- <br /> TPHg= total petroleum hydrocarbons as gasoline; BTEX= benzene, toluene, ethylbenzene, <br /> and total xylenes; MTBE= methyl tert butyl ether; TBA= tert butyl ether; ft bgs= feet below <br /> ground surface; ug/L=micrograms per liter; bold= value greater than laboratory practical <br /> quantitation limit (reporting limit); gray= value greater than LTCP threshold <br /> Hydrocarbons in B-zone wells AMW-5 and AMW-6 are associated with the nearby <br /> Transmission Store case UST case and are therefore not included in this table. <br /> 2 LTCP Groundwater Media-Specific Class 4 thresholds <br />