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EXPLANATION <br /> 1 <br /> 1� Approximate location of boring by <br /> CSB-1 `C Treadwell&Rollo,Inc.,January 2004 <br /> I B-1 -+- Approximate location of boring by Advanced <br /> d GeoEnvironmental,Inc.,June and July 2003 <br /> ¢ <br /> co / CPT-EXC-GW A Approximate of excavation groundwater <br /> II ' o sample <br /> i1 <br /> o f ® June 2004,25 foot deep shored excavation <br /> p < / <br /> Pump Island Excavation <br /> Former Underground Storage Tank <br /> removed 28 April 2004 <br /> CPr•Exc-w 6%6/zoo4 / �'April 2005,25 foot deep shored excavation <br /> TPHg 16.000 _ _ — <br /> j TPHd_ 2 700 -'r <br /> Estimated extent of 1µg/L benzene <br /> II - .t MTBE <20 / <br /> Xv-erage--G-r—oundwafe <br /> f <br /> concentration in groundwater <br /> 4s <br /> B-3 6/27/2003 Flow in Shallow Zone / WEST FREMONT STREET <br /> 74 <br /> __ _ <br /> TPHg 17,000 I; E' 420 / 'CS8-2 1/16/2004 CSB-3 1/20/2004 CPT-EXC:GW 4/20/2005' <br /> TPHd 12,000 J•,,,.X�. „1.390-+- TPHg; 34,000 TPHg ,'12.000_' TPHg 3,500 [— _ <br /> <5 " <br /> P E 1,300 <br /> 0.5 - 1 TPHd 440,000 TPHd 580. TPHd 1.100 f Sample ID(Gate) <br /> o MTBE Excavation Ara MTBE <1,000 MTBE <OS' MTBE`, <1.0 - Analyte value <br /> T 1,30 43'x14'Ix25' ee B <100 / g <05 s a1.0 (40 <br /> 300 P T 260 - <br /> .2,090 - T <0.5 — T 9.0 r <br /> E 2,500 / E <0.5 E 74 TPHg -total petroleum hydrocarbons quantified as gasoline <br /> 0 <br /> 7.100 / x <t.o x 1 zso - TPHd -total petroleum hydrocarbons quantified as diesel <br /> � - -?!30- <br /> C <br /> MTBE-methyl testing butylether <br /> c TPHg <br /> 1n6/zona CSg_2_�CSB= B -benzene <br /> ' X8=3= <br /> 5. — .TPHg 130 r-, <br /> m c�\ TPHd <5 �� t__j - Ttoluene <br /> _MTBE <5.- E -eihylbenzene <br /> CPT-EXC-GW X xylenes <br /> T <0.5 • ND -not detected <br /> Excavation Area <br /> E E <o.s , <br /> 25'x 10'x 25'dee g_2 - not analyzed <br /> -J Approximate Location of <br /> CSB-1 1 Former Gas Station Note: •---- -�, <br /> Pump Islands Cj All concentrations in rnlcrogFems per liter(µg/L)._ a <br /> CSB-4 tel-Former Building <br /> d Pump Island Excavation Location <br /> pI III 25'x22'x10'deep <br /> 8 <br /> a III j r----.--- �. <br /> g <br /> CSB-4 ( j Former Service j <br /> TPHfa 2990 I B-2 + I Station Building <br /> I <br /> p MTBE <5 ----_--_____- <br /> - III a <0.5 I` 420 N.MADISON STREET _ <br /> - 1 ( T _0.85 I Stockton,California <br /> ° I <br /> E <0.5 <br /> 1 _. <br /> � I X is � i TOTAL PETROLEUM HYDROCARBONS AND <br /> GASOLINE CONSTITUENTS IN GROUNDWATER ? <br /> 0 30 Flet Date 05/28/13 Project,No. 73�15Q89001 Figure 7 <br /> l I Approximate scale ,( arjWKXSM10 <br /> ° Reference:Basemap from Siegfried Engineering,Inc.,1999. i n - A e.1N6AN CUM'ANY <br /> i <br />