ARCHIVED REPORTS_SOIL AND GROUNDWATER INVESTIGATION REPORT 2006

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I r �• �, ?: , " "' idtam * toy v4 w ?7 ..�' _ ? WWA y .e EXPLANATION GMX-31 1 . 5 4. 5 10. 5 GMX-25 1 . 5 5 10 .5 ' "• ^ N. . . .. F � TPHA < 1 . 0 < 1 . 0 < 1 . 0 TPH-d 40 < 1 . 0 < 1 . 0 GMX-24 ® Soil and grab groundwater boring ' �• R aX TPH -mo <50 <50 <50 TPH -mo 500 <50 <50 location (up to 61 feet below 59 0 . ` '.` t B (a) P eq . ND ND ND B (a) P eq . 0.01 ND ND ground surface [bgs] ; August 2005) z B (a) P <0. 0052 <0 . 0056 <0. 0056 B (a) P 0.0065 < 000057 <060059 -05ju, 4 Wt Ott ' .� MX-3 0 Soil boring location ( 16 ft bgs ; August 2005) idA 0 A GMX-24 2 4. 5 10a5 ,`t ' ' r� G !U^ - 1 45 , Boring location ( 15 ft bgs ; November 2003) TPH-d < 1 . 0 2.4 4.8 r � : , a a a M . a , IN 0 _ . . _ . . "EV , . . � _ . . - M M - ■ .� :. . � ' Ttt , � t. ,. 's ' ;r- � ! TPH-mo <50 <50 <50 > • ``' � " ; :� v , Surface sample location ( November 2003) B(a) P eq . ND ND ND I '� f 41 low 16 "B(a) P <0 . 0055 <0. 0056 <0 . 0054 GMX-24 GMX-25 i, ,. L ; . _ . . _ Property boundary Sample location GMX-30 1 . 5 4 . 5 10 . 5 I 69 TPH-d 1 .2 < 1 . 0 < 1 . 0 ;� y. i �., a •: w g,,. � .�. . _ - GMX -20 GMX-26 k' . sa . •: 3 4 _ "per � GMX-26 1 4.5 10.5 �- Sample depth (feet bgs) TPH-mo <50 <50 <50 ' GMX-26 1 4. 5 10. 5 . TPH-d <1 .0 < 1 .0 <1 .0 ` B(a) P eq . ND ND ND `'; iu I TPH -d <1 . 0 < 1 . 0 < 1 . 0 �._ , of , TPH-mo <50 <50 <50 1 ' • B(a) P eq . ND ND ND �- Concentration in B(a) P <0 . 0054 <0 . 0053 <0 . 0051 GMX-30 GMX-31 ^ TPH-mo <50 <50 <50 's t B(aP T ` , <0.0051 <0. 0051 <D.0057 GMX-27 C�i1lr - � � ' I ' B (a) P eq . ND ND ND ,� . milligram per kilogram B (a) P <0 0051 <0 . 0051 <0 . 0057 4i ;• (mg/kg) GMX-32 1 5 10 . 5 t ' '" �'`� Constituent TPH-d 860 < 1 . 0 < 1 . 0 ' lvlx -` GMX-27 1 . 5 5 10 . 5 11 . 5 16. 5 TPI-It-mo 6700 <50 <50 GMX-32 � ' TPHA 44 370 5 . 1 44000 3 .3 B (a) P eq . 0 . 57 ND ND I TPH -mo 570 1900 <50 s 64000 < 50 TPH-d =Total petroleum hydrocarbons as diesel B (a) P 0 .52 <0 . 0053 <0 . 0056w� %` B (a) P e 0.18 0 .28 4 . 9x10- 3 .71 ND < . 4 TPH -mo=Total petroleum hydrocarbons as motor oil 10 , I B (a) P 0. 14 0.22 <0 . 0055 <3 . 6 <0 . 0058 ''� B (a) P eq . = Benzo(a) pyrene equivalent ( � I GMX-28® . . a 4 ,, t �V ,%.psi .: 11! ; B a P = Benzo a rene I � I GMX is GMX-33 dr ' 'ti .F. � . # s � '# � •� ., ( ) ( ) PY GMX-33 1 . 5 4 . 5 10 . 5 ND = Non-detect GMX-28 1 . 5 4 . 5 10 . 5 TPH -d 2 < 1 . 0 < 1 . 0 NA= Not analyzed GM ' < =Anal to was not detected at or above the laboratory TPH-d 2. 1 < 1 . 0 < 1 . 0 � +� TPH-mo <50 <50 <50 '� y ry TPH-mo <50 <50 <50 I GMX-34 B(a) P eq . ND ND NDt " � , reporting limit indicated B(a) P <0.0051 <0 . 0055 <0 . 0053 4! ' 10 B(a) P eq . ND ND ND ft ` q I . y 44 = (Bold) Analyte was detected at the concentration B (a) P <0. 0052 <0 . 0054 <0. 0052 � , GNIh - - • - • �,� 4.4 indicated GMX - 15 0' ' GMX-34 1 . 5 5 10 . 5 Note : E :,^3 i ,► I GMX- i �3 TPH -d 4.47" .4 < 1 . 0 < 1 . 0 GMX - 1r TPH-mo <50 <50 <50 ' I B (a) P eq . ND ND ND 1 . Aerial photograph from 1999 . ( - ivSr. VV`�F '." B (a) P <0 . 0051 <0. 0051 <0 . 0051 41 GMX-35 GMX-29 t 10 o I ' r : GMX-35 1 . 5 7 . 5 10 . 5 ; !{� FP TPH-d < 1 . 0 < 1 . 0 < 1 . 0 ; GMX " r I 1 x nivi - , t' TPH -mo <50 <50 <50 B (a) P eq . ND NA ND I "�y , 7 B(a) P <0 . 0054 NA <0 . 0054 t 0 200 SCALE IN FEET W OR to yCY a DISTRIBUTION OF TPH AND I B (a) P IN SOIL 'e GMX-29 1 . 5 7 . 5 10. 5 e � , \ AUGUST 2005 INVESTIGATION M TPH-d < 1 . 0 < 1 . 0 < 1 . 0 Ott 1 L ' TPH-mo <50 <50 <50 = 1TAOC Tracy Gravel Pits r Tracy , California H ■ B (a) P eq . ND ND NDOle B (a) P <0 . 0055 <0 . 0056 <0 . 0057 7to s . _ { ' { j B Date : 03-oCT-2006 Pro'ect No . 7066 . 001 . 1 m i 1 H " - 5 ti Geomatrix Figure