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Table 4 Groundwater Elevation and Analytical Data ARCO Station#548 1612 West Hammer Lane Stockton,California Calc. TOC Depth to GW TOTAL Pl Elevation Water Elev. TPH9 BENZENE TOLUENE ETHYL13ENZENE XYLENES MTBE DO Well No. Sam fin Date NP (ft MSL) (ft BGS) (ft MSL) (pglL) (pg1L) (pg1L) (pglL) (pgll-) (pglL) (mglL) Comments MW-7 1211312004 P 10.70 31.43 -20.73 51 <2.5 <2.5 <2.5 .42.5 41[2] 2 MW-7 12!2212004 P 10.70 30.35 -19.65 <100 <0.5 <0.5 <0.5 <0.5 30[2] 3.5 r' MW-7 3129!2005 P 10.70 27.83 -17.13 <50 <2.5 <2.5 <2.5 <2.5 56[2] 1.06 MW-7 611612005 P 10.70 27.27 -16.57 <-52 < <0.5 <0.5 <0.5 <0.5[2] 2.86 MW-7 9/9/2005 P 10.70 29.Sfi 16.Bfi <50 <0.5 <0.5 <0.5 <0.5 5,2[21 4.59 MW-7 12!712005 P 10.70 29.25 -16.55 73_ <0.5 <0.5 <0.5 <0.5 59[2] MW-7 3/22/2006 P 10.70 26.77 -16.07 77 <C.5 <0.5 <0.5 I I 1 MW-8 1211312004 P 11.93 31.04 -19.11 2,400 12 47 '51260 12.5[2] 1 2.2 MW-8 12122!2004 P 11.93 30.90 -18.97 470 6.6 2.7 4.2 81 <2.5[2] 3.9 MW-8 312912005 P 11.93 28.40 -16.47 82 <0.5 0.5 <0.5 8.9 <0.5[2] 2.2 d S MW-8 611612005 P 11.93 27.88 -15.95 I <50 <0.5 <0.5 <0.5 1.9 <0.5[2] 1.8 i MW-8 9/912005 P 11.93 30.02 -18.09 I <50 <0.5 <0.5 <0.5 <0.5 <0.5[2] 1.7 MW-8 12/712005 P 11.93 29.80 -17.87 <50 <0.5 <0.5 <0.5 <0.5 <0.5121_ MW-B 3122!2006 P 11.93 27.33 -15.40 <50 <0.5 <0.5 <0.5 <0.5 <a.5[21 3.D2 i VW-1 9/29/1998 NP 28.73 18,800 1 573 1 59 873 4.120 1 2,300 No FP No S Yes O 431 VW-1 12/30/1998 NP 26.50 1%20 200 21 50 <50 691 _3,310_ 785 No FP No S,Yes 0,[431 VW-1 313111999 24.97 No FP,No S.No O Not scheduled for sam lin VW-1 6128/1999 25.99 No FP,No S.No O Not scheduled for sampling VW-1 9/10/1999 28.33 No FP,No S.No O Not_scheduled for samplin VW-1 12!13!1999 27.46 No FP,No S.No O Not scheduled for sampling J VW-1 3/28/2000 24.23 No FP No S No O Not scheduled for sampling t l -VW-1 _61262000 25-11 No.FP,No_S,No O Not scheduled for samulinn a~1 VW-1 9728/2000 27.72 No FP,No S,No O Not scheduled for sampling VW-1 12!1812000 25.50 No FP_No 5,No O Not scheduled for samplin6 VW-1 3/14/2001 24.33 No FP,No S.No O Not scheduled for sampling_ VW-1 6/19/2001 25.50 No FP No S No O Not scheduled for sam ling_ VW-1 9/11/2001 26.28 No FP No S No O Not scheduled for sampling_ VW-1 12113!2001 NP 27.74 <50 I 2.5 <0.50 <0.50 <0.50 87[2] No FP,No S,No O VW-1 3/12/2002 NP 25.20 <50 <0.50 <0.50 <0.50 <0.50 0.66[2] No FP,No S,No O VW-1 6/17/2002 NP 26.95 <50 <0.50 <0.50 <0.50 <0 50 7.812! No FP No S,No O VW-1 9/9/2002 NP 29.54 <50 0.55 <0.5 <0.5 <0.5 60 No FP,No 5,No O VW-1 1214!2002 NP 29.64 310 14 0.59 1.1 6.1 97 No FP No 5 No Q VW-1 313120_03 NP 28.77 <100 <1 <1 <1 <1 302 VW-1 613/2003 NP 28.51 <50 <0.5 <0.5 <0.5 <,5 22121 VW-1 9/18!2003 NP 32.03 250 23 <2.5 <2.5 2.6 1202] VW-1 12!8!2003 NP 31.89 170 10 <5 <5 <5 1202] VW-1 3/11/2004 11.55 28.52 -16.97 Not Sampled VW-1 513!2004 NP 11.55 27.96 -16.41 <50 <0.5 <0.5 <0.5 <0.5 4.1[2] VW-1 6!11!2004 NP 11.55 30.28 -18.73 690 20 <2.5 <2.5 4.6 140[2] 1.7 VW-1 8/3/2004 P 11.55 31.71 -20.16 3,600 1 230 <5 330 370 280[2] 2 VW-1 12!2212004 P 11.55 31.00 -19.45 3,100 110 <10 180 250 210[21 4.9 VW-1 3129/2005 P 11.55 28.48 -16.93 2,900 1 100 <5 200 1 350 160[21 2.03 VW-1 6/16/2005 P 11.55 27.96 -16.41 1 12,000 1 230 <5 500 1,300 150[2] 1.1 VW-1 91912005 P 11.55 30.10 -18.55 1 3,400 110 <5 140 300 120[2] 0.19 VW-1 12!7!2005 P 11.55 29.89 -18-34 1 6,400 140 <2.5 300 630 1 97[2] VW-1 3!22!2006 P 11.55 27.46 -15.91 I 3,400 89 <2.5 180 310 99[2] 1.9 1 IMP-ARM04 BP Valley Portfol*k548lTables106-011548 Table 1-2-3-4 Page 7 of 14 5/31/2006