ARCHIVED REPORTS_XR0009323 - Laserfiche WebLink

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TABLE 1 ' HISTORICAL GROUNDWATER SOUNDING DATA Port of Stockton Former UST Site No 3, San Joaquin County Well Date Depth To Casing-Top Water Table Avg Flow Direction ' Number Sounded Water(Ft) Elevation(Ft) Elevation(Ft) &Gradient(Ft(Ft) From Cann MW3-3 07/09/99 1039 874 -165 10/22/99 1088 -214 02/08/00 1023 -149 05/17/00 929 -055 ' 09/14/00 1129 -255 02/14/01 1135 -261 5/17/01 1014 -140 ' 08/22/01 1205 -331 *Started pumping on MW 3-1 while gauging MW 3-2 The water level in well MW 3-2 appears to have been depressed ' **After the sampling, well MW 3-2 was allowed to recharge and the depth of water was found to be 12 48 feet below the casing elevation Well sampling and monitoring logs are included as Appendix B MGroundwater Sampling and Analyses Groundwater samples collected from the monitoring wells on August 22, 2001 and analyzed for ' TPHg by EPA Modified Method 8015, aromatics benzene, toluene, ethylbenzene, and total xylenes (BTEX) constituents by EPA Method 8260 No gasoline as free product was observed in any well The results of all current and previous groundwater sampling analyses are summarized in Table 2 PET laboratory reports dated August 27, 2001 and chain-of-custody are included as Appendix B ' TABLE 2 ANALYTICAL DATA-GROUND WATER Port of Stockton Farmer UST Site No 3, San Joaquin County Results re orted in 1 Parts per billion= b Well Date TPH-g Benzene Toluene Ethylbenzene Xylenes MTBE ' Number Sampled EPA 8415-m—l—EPA 8260 EPA 8260 EPA 8260 EPA 8260 EPA 8260 MW3-1 07/09/99 610 18 302 236 791 N D 10/22/99 2,750 270 120 49 390 N D 02/08/00 1,800 12 85 30 180 N A 05/17/00 180 120 82 38 428 N A 09/14/00 400 11 11 60 44 N A 02/14/01 420 30 29 8 3 24 N D 5/17101 1,288 187 55 40 162 N A 08/22/01 3,500 300 160 110 430 NA ust sud WS doc 6