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Pombo Property <br /> Excavation and Monitoring Well Installation <br /> f-Sorl'and Groundwater Labora ry Sample Results (Se tember 1I 199$ <br /> Sample I.D. TEPH Gas Benzene Toluene E-Benzene Xylenes MTBE 8260 Pesk, 601 <br /> B-1-10' ND <br /> B-1-IS' ND ND ND ND ND ND ND <br /> B-1-17'H20 ND ND ND ND I ND ND ND <br /> B-2-10' ND ND ND ND ND ND ND <br /> B-2-15'H20 ND ND ND ND ND ND ND ND <br /> �3 5' :140 diesel w r ND NDND ND ND ND <br /> ND x480 ''"1000; 92Q0 26Q00#' . *230b <br /> ND 5,6,,. '' 3700 1 'OQ 200, .4000 v, **3'40 , .._1'900 <br /> B-4-1 0' ND ND ND ND ND ND ND <br /> B 4 ,15'H20 :2 1 orator oil , ;;0 09' 7.1 ND 6 9 ND <br /> B 5 10' ND 7 4ZO;- ND 4'8 s 15Q„' 310 , ND <br /> B-5-15' ND ND ND ND ND ND ND <br /> B S,11412 I00 diesel <br /> 0 5 ND 09 5 3 i3 ND ND <br /> B-6-5' ND ND ND ND ND ND ND ND <br /> 13-6-10' ND ND ND ND ND ND ND <br /> B-6-15'H20 ND ND ND ND ND ND ND ND ND <br /> B-710' ND ND ND ND ND ND ND <br /> B-7 15'1Iz0 1.5 motor oil:'; ND ND ND ND ND ND ND <br /> B-8-17'H20 ND <br /> Note: ND=Non Detect Blank Space=Not Analyzed <br /> Gasoline&Diesel Reported as mg/Kg(or mg/L for water), <br /> BTEX&Oxygenates Reported asµg/Kg(or I g/L for water) <br /> *not confirmed by method 8260 * *confirmed for MTBE by method 8260 <br /> Additional soil borings with the Geoprobe were suggested for the areas indicated <br /> on the Figure 4 Proposed Boring Locatior Map included in the M.J. Kloberdanz <br /> & Associates October 1998 report. San Joaquin County Environmental Health in <br /> a December 8, 1998 letter that no further ssessment of the tank area B-5 will be <br /> required. They did require the vertical anc lateral definition of the contamination <br /> plume in the area of B-3 and a minimum of three monitoring wells. A well ; <br /> survey showing the location of all agricultural, industrial, domestic, municipal <br /> and other wells located within a 2000-foot radius of the site was also requested. <br /> On July 6, 1999 M.J. Kloberdanz & Associates drilled 4 Geoprobe® soil borings <br /> to various depths to determine both the lateral and vertical extent of soil <br /> contamination. Boring B-9 was drilled adjacent to boring B-3, drilled in 1998, in <br /> order to obtain a vertical limit of the soil contamination. Laboratory soil samples <br /> were collected every five feet from 15 feet below grade surface to 30 feet below <br /> grade surface. Water was measured at 12 feet in depth. All four samples were <br /> non-detect for the compounds analyzed. A hydropunch apparatus was then used <br /> to obtain a water sample from below the 30-foot soil sample. It was driven to 35 <br /> feet and opened to 33 feet for a two foot sci eened interval. Traces of gasoline and <br /> gasoline constituents were present in the laboratory sample. No MTBE was <br /> detected, <br /> Boring B-10 was drilled in the suspected d wn gradient direction from baring B- <br /> 3. It was located approximately 40 feet north of the former gasoline tank. Soil <br /> samples were collected at 10 and 15 feet in depth. Water was measured at 12 feet <br /> 3 <br />