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Table 1 Groundwater Elevations and Sample Analytical Results ' Former E-Z Serve Location No 100878 1012 West Yosermte Avenue,Manteca,California • Well Sampling TOC DTW GWEI PSH TPHg B T E X MTBE NoDate (feet) (feet) (feet) (feet) (µg/L) (n/L) (µg/L) (A&P (A 1 ) MW-6 /10/96 3121 1525 1596 000 <50 08 1 9 <0 5 3 1 1 (Cont) 4/15197 3121 1294 1827 000 55 <0 5 <0 5 <0 5 2 - ' 6/20197 3121 1403 17 18 000 <50 <0 5 <0 5 <0 5 <0 5 <5 0 11/21/97 3121 15 10 1611 000 12/10/98 3121 1188 1933 000 <50 <0 5 <0 5 <0 5 <0 5 <5 0 2/5/012 31 21 1349 1772 000 <50 <0 5 <0 5 <0 5 <0 5 077 5/24/01 3121 1449 1672 000 <50 <0 5 <0 5 <0 5 <0 5 2 11/8101 3121 1647 1474 000 <50 <0 30 <0 30 <0 30 <0 60 2 1* 1/31/023 31 21 13 81 1740 000 <500 <0 5 <0 5 <0 5 <1 5 13 MW-7 5/3/94 3078 1595 1483 000 <100 <1 <1 <1 <1 -- 7/15/94 3078 1687 1391 000 1,300 35 29 48 250 9/27194 3078 1903 11 75 000 <100 <1 <1 <1 <1 - 1218194 3078 1667 1411 000 <50 <0 5 <0 5 <0 5 <0 5 3/24/95 3078 1398 1680 000 <50 <0 5 <0 5 <0 5 <0 5 6/22/95 3078 1595 1483 000 <50 <0 5 <0 5 <0 5 <0 5 -- 9/15/95 3078 1846 1232 000 <100 <1 <1 <1 <3 12/12/95 3078 1641 1437 000 <100 <1 <1 <1 <3 2/22/96 3078 1394 1684 000 <50 <0 5 <0 5 <0 5 <1 5 -- 9/17/96 3078 1667 1411 000 <50 < < < < < 12/10/96 3078 15 19 1559 000 110 21 79 13 10 < 4115/97 3078 1226 1852 000 <50 <0 5 <0 5 <0 5 <0 5 <0 5 6/20197 3078 13 10 1768 000 <50 <0 5 <0 5 <0 5 <0 5 < �• 11/21/97 3078 1441 1637 000 -- -- -- -- -- -- 12/10/98 3078 1126 1952 000 <50 <0 5 <0 5 <0 5 <0 5 <5 0 2/5/012 3078 1291 1787 000 <50 <0 5 <0 5 <0 5 <0 5 <0 5 5/24/01 3078 1348 1730 000 -- -- -- -- -- -- 11/8/01 3079 1574 1504 000 <50 <0 30 <0 30 <0 30 <0 60 <1 0* 1/31/023 3078 1325 1753 000 <500 <0 5 <0 5 <0 5 <1 5 <1 MW-8 5/3/94 3125 1655 1470 000 84 <1 <1 <1 <1 -- 7115/94 3125 1751 1374 000 1,400 27 260 48 270 -- 9/27/94 3125 1971 11 54 000 <100 <1 <1 <1 <1 -- 1218/94 3125 1722 1403 000 <50 <0 5 <0 5 <0 5 07 -- - 3/24/95 3125 1410 1715 000 <50 <0 5 <0 5 <0 5 <0 5 YY 6/22/95 3125 1621 15 04 000 <50 <0 5 <0 5 <0 5 <0 5 9/15/95 3125 19 11 12 14 000 <100 <1 <1 <1 <3 12/12/95 3125 1708 14 17 000 <100 <1 <1 <1 <3 2/22/96 3125 1459 1666 000 <50 <0 5 <0 5 <0 5 <1 5 9/17/96 3125 1739 13 86 000 <50 <0 5 <0 5 <0 5 <0 5 1 12/10/96 3125 1457 1668 000 100 23 84 14 11 06 4/15197 3125 1281 1844 000 <50 <0 5 <0 5 <0 5 <0 5 -- 6120/97 ' 3125 1374 1751 000 <50 <0 5 <0 5 <0 5 <0 5 < 1 11/21/97 3125 1498 1627 000 -- -- -- __ -- r 12/10/98 3125 1181 1944 000 <50 <0 5 <0 5 <0 5 <0 5 <5 0 2/5/012 3125 1345 1780 000 <50 <0 5 <0 5 <0 5 <0 5 <0 5 5/24/01 3125 1415 17 10 000 -- 11/8/011 3125 1636 1489 000 <50 <0 30 <0 30 <0 30 <0 60 <1 0* 1/31/023 3125 1381 1744 000 <500 <0 5 <0 5 <0 5 <0 5 <1 I Notes No known groundwater monitoring or sampling was conducted between December 10, 1998 and . I ! February 5,2001 1 TOC =1Top of casing referenced to USGS Benchmark HSi 208 fele--ahon=38 201feet above mean sea level] ` DTW =Depth to water measured from the top of casing I I EE I M GWE =Groundwater elevation as referenced to benchmark in feet above mean sea level ' PSH =Phase Separate Hydrocarbons thickness 1 I Page 4of5