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<br /> TABLE 4
<br /> Analytical Results of Pump-and-Treat Grab Ground Water Samples (µg/1)
<br /> Chapin Bros , Inc - 1766 Monte Diablo Avenue, Stockton, California
<br /> EPA 8015M EPA 8020/8260
<br /> ample I D Date gallons Ethyl TP11-g TPH-d Benzene Toluene benzene Xylene MTBE
<br /> Pre Remediation-after settling tank
<br /> 04-24-02 15,264 15,000 -- 1,300 160 78 2,800 <50
<br /> 07-15-02 553,558 4,700 -- 290 23 240 470 <50
<br /> Influent 08-22-02 867,749 2,600 32 64 33 120 <50
<br /> 11-25-02 1,333,838 2,700 -- 95 81 100 180 <25
<br /> 12-10-02 1,592,885 3,600 -- 46 77 5 8 290 <2 5
<br /> 12-27-02 1,677,237 -- 1,700 -- -- -- -- --
<br /> 01-09-03 1 Z690,903 3,500 - 120 76 68 340 <2 5
<br /> Pre Remediation-wells
<br /> 05-30-02 226,147 940 58 2 1 55 24 <5 0
<br /> 09-19-02 1,028,683 710 1 1 <0 5 <0 5 66 <5 0
<br /> 10-15-02 1,200,093 1,500 20 19 28 33 <17
<br /> 02-17-03 1,835,317 7,700 48 91 320 460 <25
<br /> 03-24-03 1,982,381 9,600 _ 35 <12 750 640 <12
<br /> 04-15-03 2,139,002 2,900 15 41 50 260 --
<br /> EW-1 05-21-03 2,312,165 4000 _ 16 <5 0 150 300 --
<br /> 06-15-03 2,193,675* 6700 32 88 610 470 —
<br /> 07-21-03 2,290,214 6400 20 39 420 260 --
<br /> 08-19-03 2,374,652 930 _ 83 45 33 26 120
<br /> 09-16-03 2,459,705 600 - 42 <0 5 <0 5 29 <0 5
<br /> 10-18-03 2,557,662 500 _ 10 <0 5 42 55 <0 5
<br /> 11-17-03 2,566,681 320 15 14 78 57 100*
<br /> 11-24-03 2,579,560 410 _ 12 8 9 41 77*
<br /> 12-15-03 2,709,959 910 95 39 34 27 42*
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