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06/10/98 18:11 x'19163645633 HLA SACRAMENTO IA002 June 10, 1998 41017 002 Mr. Michael Kith San Joaquin County Public Health Service Environmental Health Division 304 North Weber Avenue,Third Floor Stockton,California 95202 Addendum to Application for Permit to Close Underground Storage Tank(UST) 210,000-gallon UST Removal Project Newark Sierra Paperboard Mills 800 West Church Street Stockton,California Dear Mr. Kith: On behalf of Newark Sierra Paperboard Corp. (Newark-Sierra),Harding Lawson Associates(HLA)submits to San Joaquin County Public Health Service Environmental Health Division(PHS/EM)an Addendum to the Application for Permit to Close Underground Storage Tank(UST)submitted by HLA on June 5, 1998 for the UST located at the Newark Sierra Paperboard Mills, 800 West Church Street in Stockton,California (Site). This Addendum includes items and information requested by PHS/EHD in a telephone conversation with HLA on June 10, 1998. In response to the PHS/EHD request the following are submitted to PHS/EHD: • Completed PHS/EHD contractor's questionnaire for Ogiso Environmental(OGISO), a copy of OGISO's current certificate of workers compensation insurance,and a copy of OGISO's Hazardous Substance Removal Certification. • The corrected EPA Site#is CAD-981375157. • Completed Backfill Excavation Certificate • Revised Health and Safety Plan • The closure report submitted to PHS/EHD will be signed by a California Registered Geologist. The sampling performed on the stockpiles and the confirmation samples collected from the UST excavation will be performed under the supervision of a California Registered Geologist. • In regard to page 4 item 7c Decontamination Method: Steam cleaning with a 3,000 PSI steam cleaner with rotating jet nozzles and Hotsy Ripper R detergent and this will be done at least three times to achieve Triple Rinsing. • In regard to page 5 item I to: Excavation will not be lined;the stockpile will be placed on and covered by visqueen pending the analytical results on stockpile confirmation samples. If results indicate non- detectable concentrations or levels acceptable to PHS/EHU the stockpile will be used as backfill material. The backfill materials to be used do not include asphaltic concrete,asphaltic material,or the concrete from the sidewalls and bottom of the UST. • Onsite fill material consisting of insitu clayey silt and clayey sand soils and pieces of concrete which have been crushed are proposed for use backfill in the UST excavation. Onsite equipment"T-Rex jaws" will be used to crush all concrete pieces and produces four-inch minus crushed concrete. The material was derived from demolition of onsite concrete structures. The soils are not contaminated. The material does not include wood,asphaltic concrete, asphaltic papers,fibers, or other deleterious substances.