ARCHIVED REPORTS XR0000806 - Laserfiche WebLink

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• i i Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 2186 3212 N California, Stockton, CA TOC Depth to Water Level Ethyl- Total Well Date P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (frglL) (ugIL) (pgIL) (prglL) (pglL) WIL) (pglL) (mg/L) Comments VW-3B 9/27/2000 -- 1501 4081 -2580 NS — NS NS NS NS NS -- No FP,No S 10/19/2000 — 1501 4064 -2563 NS — NS NS NS NS NS -- No FP,No S 12/20/2000 -- 1501 3871 -2370 <50 -- <0 5 <0 5 <0 5 <0 5 26 5[4] — No FP,No S 3/16/2001 -- 1501 3760 -2259 <50 — <0 5 <05 <0 5 <0 5 9 12[4] — No FP, No S 6/21/2001 — 1501 4043 -2542 <1 000** - 97 53 290 750 5,000[4] — No FP, No S 9/13/2001 -- 1501 4619 -31 18 <50 -- <0 5 <0 5 <0 5 <0 5 90[4] -- [8] No FP,No S 12/11/2001 — 1501 4341 -2840 <50 - <0 50 <0 50 <0 50 <0 50 200[4] - No FP,No S 3/14/2002 — 1501 4037 -2536 <50 -- <0 50 <0 50 <0 50 <0 50 26[4] -- No FP,No S 6/19/2002 - 1501 4271 -2770 460[7] — <0 50 <0 50 <0 50 <0 50 1,500[4] -- No FP,No S 9/12/2002 — 1501 4960 -3459 320 — <2 5 <2 5 <2 5 <2 5 140 -- No FP,No S 12/3/2002 - 1501 4660 -31 59 <500 -- <5 0 <5 0 <50 <50 69 -- No FP,No S 03/11/2003 P 1501 4651 -31 50 380 1 — <2 5 <2 5 <2 5 <2 5 370[4] 095 06/09/2003 P 1501 4239 -2738 2,600 -- <10 <10 <10 <10 6,900[4) 286 09/17/2003 P 1501 51 62 -3661 110 R <5 0 <5 0 <50 <5 0 210[4] 188 12/11/2003 P 15 01 4638 -3137 16,000 1,100 930 1,100 4,300 3,500[4] — 03/10/2004 P 1501 4667 -31 65 1 76 — <10 <10 <10 <10 240[4]J 194 TPHg=Total petroleum hydrocarbons as gasoline(reported as GRO-gasoline range organics in analytical report) TPHd=Total petroleum hydrocarbons as diesel(reported as DRO-diesel range organics in the analytical report) MtBE=Methyl tert-butyl ether TOC=Top of Casing Elevation DO=Dissolved oxygen bgs=below ground surface ms]=mean sea level pglL=micrograms per liter mglL milligrams per liter PINP=purged/not purged <=below given laboratory detection limits —=not measured or analyzed FP=Free product Measured in feet S=Sheen NM=Not measured NA=Not analyzed NS=Not sampled =Raised MRL due to high analyte concentration requiring sample dilution '*=Reporting limit raised due to matrix interference [2]=Measured from ground surface [4]=MtBE was analyzed using USEPA Method 8260 (5]=Chromatogram Pattern Weathered Gasoline C6-C-12 [6]=Sample analyzed outside USEPA recommended hold time [7]=Hydrocarbon pattern is present in the requested fuel quantitation range,but does not resemble the pattern of the requested fuel (8]=On the chain-of-custody forms,samples were identified as MW-1B,MW-2B,and MW-3B,respectively Report Date May 5,2004 Page 9 of 10