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Manteca Unified School District <br /> Subsurface Soil &Groundwater Invgation <br /> one of the monitoring wells will be located in the suspected down gradient direction from <br /> the former tank pit. The other wells will surround the site to demonstrate the lateral <br /> limits of the soil and groundwater contamination. <br /> A maximum of three soil samples will be obtained from each boring for laboratory <br /> analysis and will include a sample from the capillary zone and any apparently <br /> contaminated areas above or below groundwater. All wells will be developed, depth to <br /> water measurements collected, and groundwater samples collected for laboratory <br /> analysis. The wellheads will be surveyed to a known elevation and the direction and <br /> magnitude of groundwater flow calculated. Rinse water and drill-cutting disposal will be <br /> the responsibility of the client. <br /> All samples will be delivered under chain of custody to an analytical laboratory licensed <br /> by the State of California for hazardous materials work. The samples shall be analyzed <br /> for Total Petroleum Hydrocarbons (diesel) and BTX&E (Benzene, Toluene, Xylene, and <br /> Ethyl Benzene) by method 8021B. <br /> M.J. Kloberdanz & Associates will determine the location of any 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 permit agency and the <br /> Water Resources Board. Construction details will be obtained if available for all water <br /> wells with the 2000-foot radius. <br /> A report of the subsurface investigation containing scaled site map, boring logs, and soil <br /> and groundwater sampling records with laboratory data sheets will be prepared at the end <br /> of this phase of work. All work will be certified as conducted under the direct <br /> supervision of a licensed professional. <br /> 2.1 Drilling <br /> Permits will be obtained as necessary for all wells (including borings) before <br /> drilling begins. The soil boring will be accomplished using a mobile mounted <br /> drilling rig employing the use of a hollow stem flight auger no less than 3 1/4- <br /> inch i.d. and 8 718 o.d. <br /> All drilling equipment will be thoroughly steam-cleaned before drilling begins, to <br /> prevent the introduction of contamination from off site, and between borings to <br /> prevent cross contamination. <br /> The borings will be logged under the direct supervision of a registered <br /> professional using the Unified Soil Classification System. The color, texture, <br /> moisture, plasticity (if applicable), consistency of the earth materials, pertinent <br /> soil or bedrock characteristics, and any evidence of contamination will be noted. <br /> All water-bearing zones and the depths at which they were encountered will be <br /> noted on these logs. <br /> All borings will be drilled in such a manner as to prevent cross contamination <br /> between strata. Exploratory soil borings within the unsaturated zone will be <br /> 3 <br />