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�EI SUMMARY OF GROUNDWATER ELEVATION AND ANALYTICAL DATA SHOP 10 MAINTENANCE STATION STOCKTON,CALIFORNIA TOC Depth To Ground- Ethyl- Total MTBE TPH-G TPR-D Benzene Toluene Well 1 D .Date Elevation Ground- Water (PO) (RA) (PO) ( 1) Benzene Xylenes � � Water Elevation (lO) ("A) MW-13_ _ 7/3/96--- —2112--- 58 94 37_82 __800__ 120_ 320 07 15 18 06 MW_13__ _10124/96 __21 12 ____ 59 41 � -3829 _ -- 2,500_____17_0_ _ 1000 _ - -<10 58 -- 110 - I 1 MW-13_ _ 5/22/97__ _21 l2 ____5441 _ 33 29 _5,200__ ____NA __2 100_ _ 130_ 130 _ _ 530 2 MW-13 9/25/97 ___2112 __5677 ___3565 _2,800 _<500 _ _990 _ 74 33 200 <06 �MW-13 12/29/97 _ _ _ 21 l2 _ 55 90 -34 78 _ 3200 <5000_ 1 100 68 43 210 <5 _MW-13 _ 3/16/98__ 21 12 _ 5228 -31 16_---440— 73__ _200- - 3 <05 _t8 <5 MW-13 6/15/98_ 21 12 4864 -2752 10 000 <5000 4_200 59 260 630 _ _ <5 MW 13 8125198 2112 4935 -2823 2200 <5000 1200_ �_-5 -- __81 —130_ <06(<I0) _MW-13 _12/2/98 21 12 Construction Zone ---- --- MW-13 __MW-13 3/30/99 2106 4545 2439 <100 400 950 _4 3 J _ 75 _ 35 _ T <0 6 MW-14 10122/93_ 2195 6792 4597 ND ND -- —1 4_ _ND_ _ ND MW-14 5126/94 21 95 _ 65 60 -43 65 052 Nd __58 7 5_96 ___ ^_ND _I 7 MW--14 6 _4/24/9 21 70 _ 6075 -3905 11,000 _ <50 3200 _ _ 320 410 1,000 <5 _MW-14 7/3196 21 70 _ _5_924 -3754 10,00 _1,100 _ 3,200 _ 170 390 650 12 _ MW-14 10124_196__ --2-1-70 __ 59 78 -3808 6,300 120 2 300 68 360 150_ _ 43 —MW-14 _ 5/22/97 _ _ _2170 5475 3305_ 1,700 <500_ -_370- - - 9 82 _ 20 2_ __MW-14 9/25197 _ 21_70_ 5710 _ _3540_ <500 <500 9 5 10 4 <06 MW_I4 12/29/97 _ 2170 5628 _ -3458 _ 590 <5000 81 78 26 11 <5 MW 14 _3/16/98_—2170---- __5252 -3082 _ 77__ _63_ 3 <0 5 2 12 _ <5 MW-14— 6115/98 21_70 4904 -2734 <500 __ <5000_ <0_3 <_0 3_ _ <_0 3 <0 6 <5 _ M_W-14 --8/25/98— 21 70 4966 -2796 <500 _<5000_ 9 2 85 1 8 _ _5 Y _ <0 6(<I_0) —MW-14 1212198_ _ 21 70 49 16 ` -2746 <500__ <400 09 <1 0 <[0 <3 0 <1 0(<t 0)� MW-14 411199 2167 4578 -24 11 <100 _ <100 <0 1 -<02- <0 I <0 l _<0 6 MW_-16 10122193 __22 12_ _ 67_92_ _ 4580 ND - ND _ - -ND Y- ND _ ND_ -- -- — MW-16 5/25/94 22_12 _6558 -43_46__ _ND __ND ND_ ND Y ND ND -- -MW-16- _ _4123196 21_88_ _ _ _60 55 _38_67 t00__ <50� _ 69---- 17 32 ^28 _<0 5 MW-16 712196_—21-88-- 5947 _ -3759 60_ 90 48 _ 11 _ l 7 90 <0 5 _ _MW-16 _ 1012319_6 _ 2188 5991 -3803 50 <54 —18--- __ 6 l 1 3 _ 89 _ _ <05— MW-16- 05___MW-16 __5122/97 2I 88___ 5495 _ -3307 <500 _NA__ <0_3 <0 3_ <0 6 <0 6 <0 6 MW-16_ 9125/97 2188 88 57 50_ _ 3562 <500� T <500 _�<0.3 _ <03— _ <0 6 _<0 6 W _<06 _ MW-16 _ 12129/97 2188 5651 -3463 <50 <5000 <0 5 __ <0 5 <0 5 MW-16 3116/98 21 88 5282 -3094 <50 <50 <0 5 <0 5 _ _<0 5 _ <1_ _ <5 —MW-16 6115198 21 88___ 49 21 X27_33_ <500 <5000 <0 3 - ^A <0 3 <0 3 <0 6 <5 —MW-16 8125198_ 21 88 4992 -2804 <500 _<5000 <0 3 _ <03 <0 3 <0 6 <0 6(<1 0) —MW-16- 12/2198 2188 Construction Zone 1972 u,i.ru'6 Page 4 of 7