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The analysis of the groundwater samples collected indicated no <br /> detectable concentrations of Toluene. <br /> Stoddard Solvent contamination was detected from less than 1 ppm to <br /> 41 ppm in the three wells. <br /> Benzene was detected in MW-1 and MW-3 at concentrations of 3 . 4 and <br /> 29 ppb respectively. <br /> Ethylbenzene was detected in MW-1, MW-2 and MW-3 at concentrations <br /> of 4. 3, 4 . 3 and 120 ppb respectively. <br /> Toluene was detected in MW-1, MW-2 and MW-3 at concentrations of <br /> 3 .9 , 6. 2 and 610 ppb respectively. <br /> JPCA recommends that the soil in the area of MW-3 be excavated, <br /> both laterally and horizontally until the concentrations of TPH' <br /> Stoddard Solvent on the edges of the excavation are below 100 ppm. <br /> The excavated soil should be treated on site or disposed of off <br /> site. The excavation will require the abandonment and removal of <br /> MW-3 . <br /> After soil removal a new well, designated for extraction, should be <br /> advanced in the area of the present MW-3 . Groundwater from the <br /> wells should be resampled. Based on the new analysis of the <br /> groundwater, a remedial system should be engineered to remove <br /> groundwater contamination if required. <br /> This report has been specifically prepared for the property located <br /> at 348 west Harding Way, Stockton, California for Peter Wallace <br /> with specific application to a soil and groundwater <br /> characterization of a former UST site for an environmental <br /> investigation. The report has been prepared with the care and <br /> skill generally exercised by reputable professionals, under similar <br /> circumstances, in this or similar localities. No other warranty <br /> either implied or expressed is made as to the professional advice <br /> presented herein. <br /> It has been a pleasure to work with you on this project. Should you <br /> have any questions or require additional information, please <br /> contact the undersigned. <br /> Sincerely, <br /> YnP. mings JohN ALT `sem <br /> 9 <br /> N°. 1136 <br /> CERTIFIED <br /> ENGINEER NG <br /> �T GEOLOGIST `Q <br /> OF CAi.1F0a <br />