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Table 1 Soil Boring and Well Construction Details 7-Eleven Store#19976 1399 North Main Street Manteca, California Well Screen Screen Well Drill Depth Diameter Top Bottom Length Comments I.D. Date (feet bgs) (inches) (feet bgs) (feet bgs) (feet) Soil Borings GP-1 04/29/98 40 2 -- -- -- GP-2 04/29/98 46 2 -- -- -- GP-3 04/29/98 47 2 -- -- -- S13-1 05/11/99 66 7 -- -- -- S13-2 1 11/01/00 1 45 6 -- -- -- Monitoring Wells MW-1 09/02/98 30 2 10 30 20 Dual-nested well MW-1A 50 2 45 50 5 MW-2 09/03/98 30 2 10 30 20 Downgradient well MW-3 09/03/98 30 2 10 30 20 MW-4 05/17/99 30 2 10 30 20 Dual-nested well MW-4A 50 2 45 50 5 Off-site monitor well MW-5 05/12/99 30 2 10 30 20 Dual-nested well MW-5A 05/11/99 50 2 45 50 5 MW-6 1 12/22/99 1 30 2 10 30 20 MW-7 11/01/00 30 2 15 30 15 MW-8 11/29/06 33 2 13 33 20 Remediation Wells SP-1 10/29/01 35 2 30 35 5 Dual-nested sparge well SP-1A & 10/30/01 50 2 45 50 5 SP-2 11/29/06 38 2 35 38 3 02 Injection Well SP-3 38 2 35 38 3 Oz Injection Well Soil-Gas Borings SG-1 09/18/00 3 1 -- -- Well destroyed 09/18/00 SG-2 09/18/00 3 1 -- -- Well destroyed 09/18/00 SG-3 09/18/00 3 1 -- -- Well destroyed 09/18/00 SG-4 09/18/00 3 1 -- -- Well destroyed 09/18/00 SG-5 09/18/00 3 1 -- -- Well destroyed 09/18/00 SG-6 09/18/00 3 1 -- -- Well destroyed 09/18/00 SG-7 09/18/00 3 1 -- -- Well destroyed 09/18/00 SG-8 09/18/00 3 1 -- -- Well destroyed 09/18/00 SG-9 09/18/00 3 1 -- -- Well destroyed 09/18/00 SG-10 1 09/18/00 3 1 — -- Well destroyed 09/18/00 SG-11 1 09/18/00 3 1 -- -- Well destroyed 09/18/00 Explanation Wells are of poly-vinyl-chloride(PVC)construction Q/C bgs=Below ground surface On September 18,2000,as requested by the SJCPHS,eleven soil-gas survey points were pushed to 3 feet bg. 19976 Vapor Risk Assessment Tables.xls Page 1 of 1