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i I Table 2 HISTORICAL GROUNDWATER SAMPLE ANALYSES April 1991 — Present . (In parts per billion) MANTECA BEAN FACILITY 229 MOFFAT BOULEVARD,MANTECA CALIFORNIA SAMPLE SAMPLE ETHYL— TOTAL ORGANIC I D DATE TPH-G BENZENE TOLUENE BENZENE XYLENES LEAD* LEAD EDB MW-1 04/18/91 -- -- -- -- -- -- i -- 02/21/92 05/21/92 MW-2 04/18/91 110,000 21,000 28,000 34,000 18,000 121 <50 58 02121192 140,000 20,000 29,000 3,800 19,000 310 -q5/2.1/92 260,000 22,000 32,000 51300 29,000 -- - MW-3 04/18/91 -- — -- -- -- -- _ 02/21/92 — — — -- -- _- 05/21/92 MW-4 04/18/91 02/21/92 05/21/92 —— - — — MW-5 04/18/91 49,000 4,100 24 2,700 6,200 35 <50 <002 02121/92 05121/92 MW-6 04/18/91 130 4 2 07 2 11 <50 <0 02 02/21/92 —— — — — — 05/21/92 -- — MW-7 04/18/91 32,000 9,100 5,200 1,100 5,100 15 <50 96 02/21/92 30,000 6,500 2,800 6110 3,400 36 _ -- . 05/21/92 27.000 3,700 2,600 370 3.100 — _ — MW-8 04/18/91 <10 <03 <03 <03 <06 <5 <50 <0 02 02/21/92 <30 <030 <0,30 <0 30 <0 30 68 -- — 05/2492 <30 <0 30 <030 <0 30 <0 30 -- - -- MW-9 04/18/91 -- -- -- -- -- _ — _ 02121/92 05/21/92 MW-10 04/18/91 <10 <03 <03 <03 <06 17 <50 <002 02/22/92 <30 <0 30 <030 <0 30 <0 30 87 — -- 05/21/92 <30 <030 <030 <030 <030 -- MW-11 04/18/91 <10 <03 <03 <03 <06 14 <50 <002 02/21/92 <30 <030 <030 <0 30 <030 a2 -- 05/21/92 <30 <030 <0 30 <0 30 <0 30 — - — MW-12 04/18/91 <10 <03 <03 <03 <06 15 <50 <0 02 02/21/92 <30 <0 30 <0 3o <0 30 <0 30 0 017 — -- 05/21/92 <30 <030 045 <030 031 -- - -- MW-13 04/18/91 <10 <03, <03 <03 <06 <5 <50 <0 02 02/21/92 <30 <030 <0 30 <030 <0 30 0 037 — — 05121/92 <30 <030 <0 301 <03ni <030 I - -- -- MW-14 04/18/91 <10 <03 <03 <03 <06 <5 <50 <002 02/21/92 <30 <0 30 <030 <030 <0 30 67 — — 05/21/92 <30 <0 30 <0 30 <0 30 <0 30 - — — EXPLANATION TPH—G=Total petroleum hydrocarbons—as—gasoline EDB= 1,2—Dibromoethane -- = Not analyzed 'in parts per million(ppm or ug/L) see Iaborato report for method detection limLm GSATAW_WK1 [77W GROUNDWATER I TECHNOLOGY