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PROBLEM AMSSIENT REPORT <br /> 5131 Pacific Ave , Stockton, CA <br /> Aegis Project No 90-020 <br /> Page 13 <br /> 5.0 CONCLUSIONS <br /> Aegis offers the following conclusions regarding petroleum <br />' hydrocarbons in soils beneath the site: <br /> 1) Petroleum hydrocarbons exist in fill material within the <br /> original tank basin, in native soils adjacent to and below <br /> the original tank basin. <br /> 2) The primary source of petroleum hydrocarbons in soil appears <br /> to have been a hiatus (cause unknown) in the bottom of the <br /> regular unleaded tank. <br /> 3) Ground water, containing dissolved petroleum hydrocarbons, <br /> ' exists beneath the site at approximately 55-feet below <br /> grade. <br /> 4) The extent of ground water containing dissolved petroleum <br /> hydrocarbons remains undefined. <br /> 5) The system of vapor extraction wells , horizontal vapor <br /> extraction piping system and ground water monitoring wells <br /> may be sufficient to begin removal of petroleum hydrocarbons <br /> beneath the site. <br />