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_._____-_____ <br /> �I <br /> 21 July 1992 <br /> (GeoAudit MDC Ukiah-1. 9) <br /> Ms. Bonnie Rolandelli <br /> Associate Engineering Geologist <br /> Regional Water Quality Control Board - North Coast Region <br /> 1440 Guerneville Road <br /> Santa Rosa, California 95403 <br /> Subject: Bioremediation Project - Security Pacific Corporation <br /> 300 S. State Street, Ukiah, California <br /> Dear Ms. Rolandelli: <br /> In accordance with the request of our client, Security Pacific <br /> Corporation, we have performed and completed the bioremediation <br /> project at the referenced address. A work plan for this purpose was <br /> submitted to and approved by Ms. Janice Goebel of the Regional <br /> Water Quality Control Board - North Coast Region (RWQCB-NCR) . <br /> SUMMARY OF PREVIOUS PHASES <br /> Bioremediation of contaminated soils was initiated on 31 October <br /> 1991. The first treatment cell ("A") contained approximately 400 <br /> cubic yards of soil. On 16 December 1991, 16 discrete soil samples <br /> were collected from the treated soil and analyzed for total <br /> petroleum hydrocarbons (TPH as gasoline) and purgeable aromatic <br /> hydrocarbons. A report on the original treatment cell was submitted <br /> to the RWQCB-NCR on 7 January 1992 . The report describes the <br /> details of sample collection and laboratory analysis. <br /> Soil from the first treatment cell was used to backfill the <br /> excavation as detailed in a report titled "Mitigative Activities by <br /> Overexcavation and Bioremediation" submitted to the RWQCB-NCR on 27 <br /> May 1992 . <br /> CURRENT PHASE <br /> On 30 April 1992 two additional treatment cells were created, <br /> treatment cells "B" and "C" . These treatment cells contained <br /> approximately 625 and 550 cubic yards of soil, respectively. <br /> TREATMENT CELL "B" <br /> On 26 June 1992 , 25 soil samples were collected from treatment.,cell <br /> "B" . Prior to sampling, the treatment pile was divided into 25 <br /> sections consisting of approximately 25 yards each. One sample was <br />