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1 Geolo�tcdTecfinus'nr-- Page 2 <br /> Soil and Groundwater Investigation Work Plan <br /> ' Cardoza(Main St} <br /> Project No 662 2 <br /> June 17, 1998 <br /> The boreholes will be drilled with a GeoProbe ng owned and operated by V&W Dnlltng of <br /> Rio Vista, CA (C57# 720904) The GeoProbe advances a coring tool with a pneumatic <br /> hammer to a selected depth Upon reaching that depth the coring tool is opened and <br /> ' advanced further to fill the core barrel The soil sample enters an acetate cylinder contained <br /> in the coring tool Upon filling, the coring tool is pulled from the hole and the cylinder is <br /> removed The cylinder is then cut and the selected interval is capped with Teflon end caps <br /> and placed on ice for shipment to the laboratory The remainder is used for geologic logging <br /> The capillary fringe soil sample from each borehole will be submitted to the laboratory for <br /> analysis <br /> Groundwater Grab Sampling <br /> Upon reaching the capillary fringe a hydropunch type sampling tool will be advanced into the <br /> groundwater and a groundwater sample will be collected from each borehole The samples <br /> are collected from a mint stainless steel bailer and gently transferred into VOA vials The <br /> VOA vial is capped, inverted, tapped, and checked for headspace bubbles The vial will be <br /> ' labeled and placed on ace for shipment to the laboratory Clean surgical gloves are worn at <br /> all tames in handling of the sample and sampling equipment The bailer is cleaned between <br /> uses with an Alconox solution <br /> After the groundwater grab sample is collected the borehole will be closed with a neat cement <br /> grout containing less then 4%bentonite <br /> ' 2.2 Soil Laboratory Analyses <br /> Two soil samples will be submitted to Sherwood Laboratories of Hilmar (State Certified <br /> Laboratory#1400) for analysis for <br /> ' • Benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 8020 <br /> • Gasoline range petroleum hydrocarbons (TPH-G) by EPA method 5030/8015(m) <br /> • Methyl Tertiary Butyl Ether (MTBE) by EPA method 8020 <br /> ' The detection limits for these compounds are lasted below A Chain of Custody will be <br /> completed for all samples collected and tracked to ensure sample integrity <br /> Detection Limits <br /> of µg g <br /> ' 2.3 Groundwater Sample Analyses <br /> One groundwater sample from each borehole will be submitted to Sherwood Laboratories of <br /> ' Hilmar(State Certified Laboratory #1400) and analyzed for <br /> Benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 602 <br /> • Gasoline range petroleum hydrocarbons (TPH-Gas) by EPA method 5030/8015(m) <br /> }' • Methyl Tertiary Butyl Ether (MTBE) by EPA method 602 <br /> The detection limits for these compounds are listed below A Chain of Custody will be <br /> completed for all samples collected and tracked to ensure sample integrity <br /> F-Dr etection Limits BI EX I MTBE 7=H-Gasoline <br /> Water gg <br />