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Weston Solutions, Inc. <br /> Remedial Action Work Plan for the San Joaquin County Human Services Agency Site-Stockton, California <br /> Table 4-1 <br /> Groundwater Data Summary (4th Quarter 2019 and 2nd Quarter 2020) <br /> Well MW-2 MW-2A MW-6 MW-7 MW-10/Duplicate <br /> Analyte 07/28/20 12/17/20 07/28/20 12/17/20 07/28/20 12/17/20 09/04/20 12/17/20 07/28/20 12/17/20 <br /> Benzene 14,000 12,000 15 0.9 J ND(1 0) (1.0)D7.3 1.7 1.6/1.6 0.6 J <br /> Toluene 28J 29 J 0.5 J ND ND ND 0.2 J ND ND/ND ND <br /> (5.0) (5.0) (5.0) (5.0) (5.0) (5.0) <br /> Ethyl 24 J ND 0.6 J 0.8 J ND ND 0.1 J ND ND/ND ND <br /> benzene (500) (5.0) (5.0) (5.0) (5.0) (5.0) <br /> Total xylenes 24 J (N00) 0.6 J ND(10) NS 0) ND(10) NS 0) ND(10) ND/ND ND(10) <br /> MTBE ND(20) ND ND ND ND ND ND ND ND/ND ND <br /> (100) (0.2 1.0 1.0 1.0 1.0 1.0 1.0 1.0 <br /> Naphthalene -- -- 1.7 1.7 -- -- -- -- -- -- <br /> TPH-g 29,000 15,000 1,200 780 ND(50) ND(50) 200 130 N( 0 D ND (50) <br /> TPH-d 220 300 81 J 120 NOD 130 600 68 J 56 J/57 J 47J <br /> Notes: <br /> All results reported in micrograms per liter(µg/L). <br /> C=Presence confirmed,but RPD between columns exceeds 40%. <br /> J=Estimated value. <br /> Y=sample exhibits chromatographic pattern that does not resemble the gasoline or diesel standard. <br /> ND(##)=analyte not detected;detection limit indicated in parentheses. <br /> TPH-g=Total petroleum hydrocarbons as gasoline(C6-C 12). <br /> TPH-d=Total petroleum hydrocarbons as diesel(C10-C24). <br />