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= no = M r r rr �r ■r rr r rr rr r r r Project No 58100-06-18A December 9, 1996 Page 3 of 3 TABLE 3 SUMMARY OF GROUNDWATER ELEVATION AND ANALYTICAL DATA CALTRANS SHOP 10 1603 SOUTH B STREET,STOCKTON,CA Well Date TOC Depth to Groundwater` TPHg TPHd Benzene Toluene Ethyl- Total MTBE Sampled by Number Elevation Groundwater Elevation W/1) WA) (Ag/1) (µglq) benzene Xylenes (MSL) (feet) (MSL) (µ91l) GLO)MW-16 1 UTMT— 2212 6792- -4580 ND ND ND ND EA (N�) MW-16 05/25/94 2212 6558 -4346 ND ND ND ND ND ND — NM MW-16 04/23/96 2188 6055 -3867 100 <50 6 9 17 3 2 28 <0 5 GEOCON MW-16 07/02/96 2188 5947 -3759 60 90 48 11 17 9 0 <0 5 GEOCON MW-16 10/23/96 2188 5991 -3803 50 <50 18 6 1 13 89 <0 5 GEOCON MW-16dup 10/23/96 2188 --- — 50 --- 18 62 13 9 0 <0 5 GEOCON MW-19 10/22/93 2179 6794 4615 ND — ND ND ND ND -- EA MW-19 05/26/94 2179 6550 4371 ND ND ND 227 ND ND — NM MW-19 04/23/96 2177 6021 -3844 <50 <50 0 7 21 <0 5 2 7 <0 5 GEOCON MW-19dup 04/23/96 2177 -- — <50 <50 07 2 0 <0 5 2 6 <0 5 GEOCON MW-19 07/02/96 2177 5924 -3747 <50 <50 08 3 4 0 9 45 <0 5 GEOCON MW-19dup 07/02/96 2177 — -- <50 — 0 9 34 0 9 45 <0 5 GEOCON MW-19 10/23/96 2177 5970 -3793 <50 <50 12 33 05 36 <0 5 GEOCON I MW-20 10122/93 22 12 6792 4580 ND -- ND ND ND ND --- EA MW-20 05/24/94 2212 6550 4338 ND ND ND ND ND ND --- NM MW-20 04/23/96 2252 6093 -3841 60 <50 0 6 2 2 0 5 3 0 <0 5 GEOCON MW-20 07/02/96 2252 6005 -3753 80 70 52 13 24 12 <0 5 GEOCON MW-20 10/23/96 2252 6049 -3797 <50 <50 2 7 6 9 1 1 7 6 <0 5 GEOCON MW-24 10/22/93 2179 6792 4614 ND — ND ND ND ND --- NM MW-24 05/26/94 2179 6564 4385 ND ND 142 2 6 ND ND --- EA MW-24 04124196 2150 6020 -3870 70 <50 <0 5 0 6 <0 5 0 7 <0 5 GEOCON MW-24 07/03/96 2150 5914 -37 64 60 80 <0 5 <0 5 <0 5 <0 5 <0 5 GEOCON MW-24dup 07/03/96 2150 — — 60 80 <0 5 <0 5 <0 5 <0 5 <0 5 GEOCON MW-24 10/23/96 2150 5960 -38 10 70 <50 2 6 8 4 17 11 <0 5 GEOCON VW-1 04/24/96 2209 6081 -3872 13,000 <50* 2,300 1,200 330 1,200 96 GEOCON VW-1 07/03/96 2209 5973 -37 64 4,100 380 390 360 100 400 46 GEOCON VW-1 10/24/96 2209 6019 -38 10 4,300 130 470 350 710 400 34** GEOCON MW-25 10/23/96 2195 5990 -3795 60 <50 26 5 0 to 61 <0 5 GEOCON MW-26 10/24/96 2121 5958 -3837 100 <50 3 8 <0 5 <0 5 <0 5 5 1 GEOCON MW-26dup 10/24/96 2121 -- --- 100 <50 3 7 <0 5 <0 5 <0 5 5 9 GEOCON Notes IAll groundwater elevation data prior to April,1992 was referenced from an arbitrary onsite evaluation of 100 feet WCC =Woodward Clyde Consultants 2 TOC elevations for wells MW-9 through MW-26 resurveyed with respect to Caltrans Monument 1(21 57 feet MSL) ALTON =Alton Geosctence TOC =Top of casing EA =Environmental Assessors TPHg =Total petroleum hydrocarbons as gasoline NM =Ntnyo and Moore TPHd =Total petroleum hydrocarbons as diesel MTBE =Methyl tert-butyl ether MSL =Mean sea level ug/l =Micrograms per Mer(ppb) < =Below detection limit for analytical methods used -- =Data not available or not applicable or not sampled * = Hydrocarbons lighter than diesel present,partially biodegraded gasoline f ** =Nondetected concentration of MTBE when analyzed by EPA Test Method 8260