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E 1 r Harding Lawson Associates July 13, 1998 41017 002 Ms. Margaret Lagorio San Joaquin County Public Health Service Environmental Health Division 304 North Weber Avenue,Third Floor Stockton, California 95202 Work Plan for Limited Overexcavation and Sampling 210,000-gallon UST Removal Project Newark Sierra Paperboard Mills 800 West Church Street Stockton, California Dear Ms. Lagorio: On behalf of Newark Sierra Paperboard Corp. (Newark-Sierra), Harding Lawson Associates(HLA) submits this work plan for limited overexcavtion of impacted soils encountered during the removal of a 210,000- gallon underground storage tank (UST) containing Number 6 fuel oil and located at the Newark Sierra Paperboard Mills, 800 West Church Street in Stockton, California (Site) (Plate 1). As requested by Mr. Michael Kith, of the San Joaquin County Public Health Service Environmental Health Division(PHS/EHD), the purpose of this work plan is to provide the PHS/EHD Site Mitigation Group with a description of the procedures and protocols to be used during the overexcavation of impacted soils encountered during removal activities on July 9, 1998. BACKGROUND The 210,000-gallon concrete UST was used to store a heavy fuel oil (Number 6 fuel) and is located in the southeast corner of the Site (Plate 2). The UST is being removed under permit with regulatory oversight by Mr. Michael Kith of the UST Group in PHS/EHD. A site specific Health and Safety Plan(HSP) was prepared and approved that was consistent with the requirements of Title 8 CCR 5192; during overexcavation work, procedures outlined in the HSP will be followed. Prior to UST removal activities, Underground Service Alert(USA) was notified to mark existing utilities present at the site, and a private utility locator surveyed the excavation area and marked additional subsurface utilities. Quarterly sampling of four monitoring wells located around the UST have not detected any analytes above method reporting limits. Depth to groundwater was measured on July 9, 1998 at approximately 13 feet below the ground surface(bgs). The UST is cylindrical, a diameter of approximately 70 feet, and the bottom of the UST occurs at approximately 7.25 feet bgs. The closure of this UST is being accomplished by removal of the concrete sides and bottom of the UST and the wooden roof. During removal operations on July 9, 1998, approximately half of the concrete sidewall and bottom had been removed when Mr. Kith arrived for observation of UST removal sampling. Upon observing the impacted soil around the perimeter of the former UST location Mr. Kith indicated that a work plan would be required to be submitted to the Site Mitigation Group and approved prior to performing any overexcavation. The impacted soils(exhibiting moderate hydrocarbon odors and dark discoloration of the normally medium brown-colored silty clay and Engineering and Environmental Services 10265 Rockingham Drive,Suite 150,Sacramento,CA 95827 916/364-0793 Fax:916/364-5633 o'?r