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PROBLEM ASSESSMENT REPORT <br /> Moreland Court Shell <br /> 7700 Moreland Court, Stockton, California <br /> ' Delta Project No 40-88-146 <br /> Page 17 <br /> ' It is Delta's opinion, based on data collected from the site, that the concentrations of TPH detected in soil <br /> samples near the former product line and storage tank locations are confined to a small volume of soil and <br /> ' that the geology of the site (clayey soils) inhibits the vertical migration of petroleum constituents It is our <br /> opinion that the small quantity of soil containing petroleum hydrocarbons does not present a threat to <br /> ground water which is greater than 70 feet below the surface Dispersion of the petroleum constituents will <br /> occur as they migrate through the soils toward the ground water Also, the clay soils beneath the site will <br /> ' likely attenuate petroleum hydrocarbons Furthermore, natural biodegradation through time will decrease <br /> the existing petroleum concentrations Consequently,Delta is recommending that no further action betaken <br /> ' at the site <br /> 6 0 REMARKS/SIGNATURES <br /> ' The findings contained in this report represent our professional opinions, and are based in part, on <br /> information supplied by the client. These opinions are based on currently available information and are <br /> arrived at in accordance with currently accepted hydrogeologic and engineering practices at this time and <br /> location Other than this, no warranty is implied or intended This report has been prepared solely for the <br /> ' use of Shell, and any reliance on this report by third parties shall be at such party's sole risk <br /> ' DELTA ENVIRONMENTAL CONSULTANTS, INC. <br /> This report was prepared by .� /, ` -(_ + �� Date <br /> Lisa Rainger <br /> Hydrogeologist <br /> This report was reviewed by i� �h Z �� Date_ <br /> ' aures R Brownell <br /> /JY <br /> Hydrogeologist/Prolect Manager <br /> The work performed in this <br /> report was done under the <br /> supervision of a California <br /> Registered Geologist /Z r Date <br /> Bnan I- Krdgseng <br /> California Registered <br /> Geologist #2303 <br /> ' Ilaw <br /> Ir <br />