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M4nteca Unified School District <br /> Slibsurface Soil&Groundwater Inve3TCgation `..� <br /> from the boring and contained trace levels of diesel. No BTEX was detected in <br /> either the soil or water samples. <br /> The groundwater samples were collected by driving a hydropunch type well <br /> screen from 20 to 24 feet in depth. <br /> Table of Laboratory Soil Sam le Results (12-6-2000) <br /> Sample I.D. Diesel Benzene Toluene E-Benzene Xylenes <br /> B-1-10' 5.5 ND ND ND ND <br /> B-1-15' 7.8 ND ND ND ND <br /> B-1-20' 3.5 ND ND ND ND <br /> B-1-30' 4.8 ND ND ND ND <br /> Table of Laboratory Soil Sample Results (12-6-2000) cont. <br /> Sam le I.D. Diesel Benzene Toluene E-Benzene Xylenes <br /> B-2-8' 4.2 ND ND ND ND <br /> B-2-16' 3.9 ND ND ND ND <br /> B-2-24' 7.3 ND ND ND ND <br /> B-3-8' 5.6 ND ND ND ND <br /> B3-16' 3.8 ND ND ND ND <br /> B-3-24' 68 ND ND ND ND <br /> ND=NON-DETECT Mg/Kg for diesel µg/Kg for BTEX <br /> Table of Laboratory Groundwater Sample Results (12-6-2000) <br /> Sample I.D. Diesel Benzene Toluene I E-Benzene 7XYlenes <br /> B-I NA NA NA NA NA <br /> B-2 0.54 ND ND ND ND <br /> B-3 0.21 ND ND ND ND <br /> ND=NON-DETECT Mg/L for diesel µg/l,for BTEX <br /> 2.0 WORK PLAN <br /> M.J. Kloberdanz & Associates proposes to drill 5 Geoprobe borings in the vicinity of the <br /> previously disclosed contamination, including the assumed northerly down gradient <br /> direction to (Figure 2). Four soil samples will be obtained from each boring for <br /> laboratory analysis. A water sample will be collected at the groundwater interface and <br /> prior to termination of the boring. Soil samples will be collected at five-foot intervals for <br /> geological interpretation and laboratory analysis (as described below). Samples will be <br /> delivered under chain of custody to an analytical laboratory licensed by the State of <br /> California for hazardous materials work. The samples shall be analyzed for Total <br /> Petroleum Hydrocarbons (diesel), BTX&E (Benzene, Toluene, Xylene, and Ethyl <br /> Benzene by method 8021B. MTBE and fuel oxygenates will not be analyzed since the <br /> compounds were not detected in earlier analyses by method 8260. <br /> M.J. Kloberdanz & Associates will conduct a survey of possible municipal, domestic, <br /> agriculture, industry or other water wells within a 2000 foot radius of the former diesel <br /> tank. The survey will involve contacting local drillers, the county permitting agency and <br /> 3 <br /> _ - 77- <br /> _ - <br />