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>rrrrrrrrr� r_ � >!� � � � � �► r>�r M■Iwrr ril r�r ter 11� lir � 1ti� � Project No 58475-06-24H . October 23,2003 Page 3 of 3 TABLE 1 SUMMARY OF GROUNDWATER ELEVATION AND ANALYTICAL DATA SHOP 10 MAINTENANCE STATION SAN JOAQUIN COUNTY,CALIFORNIA TOC DEPTH TO GROUND WATER SAMPLE SAMPLE ELEVATION GROUNDWATER ELEVATION TPHg TPHd B T E X MTBE FOCs ID DATE MSL (feet) MSL (µms) (µ91 1) (µg/1) (lig/1) (µg1!) (µg11) (µpi} (}tel) (feet) (fed) VM-1 519102 --- 4893 -_ <50 520 130 39 86 19 <5 ND VM-1 719/02 5053 4,900 670' 1,400 12 620 206 <5 ND - VM-1 1012102 Y- 5247 --- 420 260 69 23 19 10 <5 ND VM-1 12/11/02 5243 280 270 31 <0 5 10 52 <5 ND VM-I 3117103 --- 5133 --- 310 <50 50 <0 5 13 26 <5 ND VM-1 6116/03 --- 51 55 --- 220 <50 44 <0 5 12 65 <5 ND VM-1 9/2/03 --- 5288 --- 1,100 440 270 2 1 92 54 <5 ND VM-2 5/9/02 4850 <50 5,300 6,800 390 740 930 <20 TAME=230 VM-2 7/9102 --- 5008 --- 25,000 3,800' 8,000 160 1,200 829 <5 ND r 5 t�V VM-2 10/2/02 --- 5204 --- 12,000 4,800 5 300 17 710 160 <20 ND VM-2 12/11/02 --- 5200 --- 11,000 1,800 4,800 64 600 250 <20 ND VM-2 3/17/03 --- 5090 --- 2,300 740 840 85 120 26 <5 ND VM-2 6/16/03 --- 5112 --- 3,900 850 1,500 15 220 61 <5 ND VM-2 9/2/03 --- 5245 3,400 2,400 1,200 50 150 160 <5 ND Notes TOC=Top of Casing MSL=Mean Sea Level TPI-Ig=Total petroleum hydrocarbons as gasoline TPHd=Total petroleum hydrocarbons as diesel BTEX=Benzene,toluene,ethylhenzene and total xylenes MTBE=Methyl Cert-butyl ether by EPA Test Method 8260 FOCs=Tert-amyl methyl ether(TAME),ethyl tert-butyl ether(ETBE),di-isopropyl ether(DIPE)and tert-butanol(TBA)following EPA Test Method 8260 µg13=Micrograms per liter <,ND=Less than laboratory method detection limit --=Not available _"Sample contains hydrocarbons that do not match the diesel pattern However,quantification is based on a diesel standard"