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Historical TPH-G Concentrations in Groundwater The Earthgrains Company Stockton,California Monitoring Well ID/Concentration(ug/1) Parameter Date MW-1 MW-2 MW-3 MW-4 MW-5 MW-6 MW-7 MW-8 MW-9 MW-10 MW-11 MW-12 MW-13 TPH-G 7110187 78,000 ND(50) ND(50) 4126188 1,200 ND(50) 3119/90 17,300 ND(50) ND(50) ND(50) ND(50) ND(50) 3,300 12/20/90 9,500 ND(50) ND(50) ND(50) ND(50) 419192 65,900 200 ND(50) ND(50) ND(50) 8/19/92 96,000 ND(50) 12/23/92 88,000 ND(50) 4M93 196,000 ND(50) ND(50) 7/30/931 53,000 ND(50) ND(50) ND(50) 10/21/93 41,000 ND(50) ND(50) 12/29/93 67,000 ND(50) ND(50) 3123194 69,000 1,600 ND(50) 14,000 ND(50) ND(50) ND(50) 3,800 ND(50) ND(50) 6,500 617194 34 000 530 ND(50) 79001 ND(50) ND(50) ND(50) 1,400 ND(50) ND(50) 7,100 9/8194 28,000 1,200 ND(50) 6,600 ND(50) ND(50) ND(50) 2,400 ND(50) ND(50) 6,800 2112196 26 000 ND(50) ND(50) 3,700 ND(50) ND(50) ND(50) ND(50) 310 2,600 5114196 27,000 ND(50) ND(50) 3,800 ND(50) 53 210 ND(50) 6001 5,000 9118196 24,000 ND(50) ND(50) ND(50) ND(50) ND(50) 65 ND(50) 300 2,100 12/18/96 23,000 ND(50) ND(50) 6500 ND(50) ND(50) ND(50) ND(50) ND(50) ND(50) ND(50) 900 69 7/15/97 22,000 ND(50) ND(50) ND(50) ND(50) ND(50) 200 ND(50) ND(50) 240 ND(50) 2000 ND(50) 10/23/971 24,000 ND(50) ND(50) ND(50)1 881 ND(50) 130 ND(50) 4100 ND(50) 10/281981 16,000 ND(50) ND(50) ND(50) ND(50) ND(50) 340 ND(50)l 1900 ND(50) 5/281991 17,000 ND(50) ND(50) ND(50) ND(50) ND(50) ND(50) ND(50) ND(50)1 160 ND(50)1 22001 190 MW-1 200,000 180,000 160,000 _ 140 000 120,000 v 100 000 MW-1 80 000 i 60,000 IL 40,000 20,000 0 Jul-87 Jul 88 Jul-89 Jui-90 Jul-91 Jul-92 Jul-93 .Jul-94 Jul-95 Jul-96 Jul-97 Jul-98 Date ND Not detected at or above laboratory detection limit shown in parentheses TPH-G Total petroleum hydrocarbons as gasoline ug/I Micrograms per liter E 11213821125997Wsttvh xls ]