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POmbo Ranch Facility August 17,2004 <br /> Subsurface Investigation Report& <br /> Second Quarter Groundwater Monitoring <br /> . Boring B-1 was dulled in an area of a small pesticide spill identified by the property <br /> owner. Petroleum analysis was included in some of the samples because of the close <br /> ' proximity to the fuel storage area. Borings B-2, 3, & 4 were drilled around the above <br /> ground fueling area with boring B-3 located at the location of the former underground <br /> tank excavation. Boring B-5 was also drilled in the area of a previously removed <br /> underground fuel tank. Boring B-6 was drilled in the Truck and Tractor wash area and <br /> sampled for pesticides and petroleum compounds. Boring B-7 was drilled in a location <br /> where above ground fuel was stored and used historically. Boring B-8 was drilled in <br /> ' front of the barn at 24124 Lammers Road where refrigeration equipment is dismantled. <br /> Since there was no apparent spillage or dumping of refrigerants, only groundwater was <br /> sampled and analyzed. <br /> ' Sail and Groundwater Labora ory Sam le Result Se tember 16, 1998 <br /> Sample LD. TEPH Gas Benzene Toluene E-Benzene I X lenes I MTBE 8260 Pest. 601 <br /> ' B-1-10' ND <br /> B-1-15' ND ND ND ND ND ND ND <br /> B-1-17'H20 ND ND ND ND ND ND ND <br /> B-2-10' ND ND ND ND ND ND ND <br /> B-2-15'11,0 ND ND ND ND ND ND -ND ND <br /> ND ND ND ND ND ND <br /> ND 1 i l r € € I € 1 <br /> ND I r i € t l € I r €€€i <br /> B-4-10' ND ND ND *ND ND ND ND �7 <br /> - ND � _ ND <br /> ND ND ND <br /> B-5-15' ND ND <br /> ND ND ND ND ND <br /> ND ND ND <br /> ' B-6-5' ND ND ND ND ND ND ND ND <br /> B-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-7-10' ND ND ND ND ND ND ND <br /> • © 4 9 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 pg/L for water) <br /> *not confirmed by method 8260 * *confirmed for MTBE by method 8260 <br /> iAdditional soil borings with the Geoprobeo were suggested for the areas indicated on the <br /> Figure 4 Proposed Boring Location Map included in our October report. San Joaquin <br />' County Environmental Health has since indicated in their letter dated December 8, 1998 <br /> that no further assessment of the tank area B-5 will be required. They did require the <br /> vertical and lateral definition of the contamination plume in the area of B-3 and a <br /> minimum of three monitoring wells. A well survey that shows the location of all <br /> -agricultural, industrial, domestic, municipal and other wells located within a 2000-foot <br /> radius of the site was also requested. <br />' On July 6, 1999 M,J. Kloberdanz & Associates drilled 4 Geoprobe'r' soil borings to <br /> various depths to determine both the lateral and vertical extent of soil contamination. <br />' 2 <br />