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09/13/96 FRI 15:26 FAX 1. 415 882 1673 t0001 <br /> 0 <br /> SECOR <br /> 90 NEW MONTGOMERY STREET <br /> SUITE 620 <br /> SAN FRANCISCO,CALIFORNIA 94105 <br /> phone(415)882-1548 <br /> fax(415)882-4406 <br /> MEMORANDUM <br /> To: Mr, Harlin Knoll.San Joaquin County Environmental Health <br /> Cc: Mr. George Petray,Union Pacific Railroad <br /> From: J.G. Ritchie <br /> Subject: Excavation Backfilling,East 8th Street Property <br /> Date: September 13. 1996 <br /> Number of Pages(including cover sheet); I <br /> This Memorandum confirms our conversation of today,during which we discussed actions taken at the noted <br /> property. As you know, SECOR International Incorporated (SECOR), on behalf of our client, provided <br /> emergency response services on August 6 and 7, 1996 to mitigate released diesel fuel. Our activities included <br /> excavating and temporarily stockpiling impacted soils. We collected samples from the stockpile and from the <br /> excavation base and sidewalls. We will present the results of chemical analysis of these samples in the near <br /> future. The stockpiled soils were disposed on September 5, 1996• <br /> The excavation measures approximately 30 foci by 50 feet and has a depth of between 2 and 3 feet below <br /> surrounding grade. During our conversation, you conditionally approved our backfilling the excavation to <br /> elimaiate possible hazards associated with the open excavation. We agreed to note kr Mr. George Petray of Union <br /> Pacific Railroad prior to backfilling. We further understand that based upon your review of our forthcoming <br /> summary report and subsequazt discussions, additional, limited investigation and/or remediation may be <br /> necessary. <br /> We therefore propose to begin excavation backfilling at 7:00 am,September 16, 1996. We will use a Caltrans <br /> Class II backfill material.which will be compacted using the backfilling equipment. We do not propose to test <br /> the backfill compaction,as the excavation is shallow and the material requires little compacting. The work will <br /> require approximately one day to complete. <br /> Our on-site contact will be Ms, Suzanne Biller. Your questions regarding oversight costs should be directed to <br /> M.r,Dwayne Chastain at(510)679-8147, We appreciate your assistance with this project. Please do not hesitate <br /> to contact tis al (415)882-1548 with any questions or comments. <br /> Sincerely yours. <br /> SECOR international Incorporated <br /> 7sGitchie_ R.G. <br /> Principal Geologist <br />