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.1-J <br /> 10/05/88 09!24 %Y20940951 1-1 01002 <br /> DAMES & MOORE <br /> YN i I LIAR IS f RUIRMT 2 w.!.iu 11,7A i AN12".: <br /> October 4 , 1988 <br /> Californiu Regional Water <br /> QualiLy Control Board <br /> 3443 Rowtiov Road <br /> Sacramento , CA 95827 <br /> Attention : Mr . Gordon Boggs <br /> RE : Chevron S . S . $96465 <br /> Phased Remedial Action <br /> Pershing Avinve & Robinhood Driv(-. <br /> Stockton, Califovnia <br /> Dear Mr. Boggs : <br /> Pu7suant Lo you.r requost during our meeting at your <br /> OffiQn Yesterday ( OcLober 3 , 1988 ) we have propared a phased <br /> contaminaLion remediation approach for the ahave-referenced <br /> subicct Property . The phased approach to t:he remedial effort <br /> proposed for the subject properLy addresses bot.h subsoils <br /> contamination and ground water contamination . <br /> As YOU are aware , the Ltnderground fUel storage tanh,-, <br /> were recently removed Prom the subject property . sampjas <br /> were obtained by others , and were taken near Lha: southwcsl. <br /> corner of the tank excavation and product lines , The results <br /> of the chemical analysis conducted on Lhose samples revealed <br /> petroleum contamination. Thh waste oil tank removal sample <br /> obtainQd near the north side of UP gasoline tank excavation <br /> also revealed contamination but , to a much lesser degree ( 49 <br /> ppm ) . <br /> Several ground water monitoring wells were installed at <br /> the subject property between 1986 and 1988 . The ground water <br /> monitoring wells were installed in response to a ProducL line <br /> Nak which was -discovered soweiime in 1985 . Some preliminary <br /> chemical evaluation of ground water samples obtained from the <br /> wells was conducted in March of 1988 . A copy of the results <br /> of that chemicai analysis has been included at thQ end of the <br /> text for sy o ur review . Assessment of t.h C extenL of <br /> anntamination present in ground water at the subieQh property <br /> is currently underway . <br /> Tn ordev tm effect remndiation ) F , Hie,., contamination <br /> noted at the subject property , a three-phase remedial plan is <br /> Proposed . <br /> OFF1. <br /> 17 <br />