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k <br /> �VJAONTAENTAI_HEAir�IVISION Wright <br /> =b I :'\Nobel'Avt.Thifd'HOPf <br /> tekt Agnj.43ssEnvironmental <br /> Fk 01. <br /> , prod C�' Services, Inc. <br /> ��tned CSI <br /> Constru ion ♦ Engineering <br /> �ef3Yi�I1t1�C�8� ♦ Remediation ht7nFl LJ <br /> w y �' MAY 18 19 <br /> Etat . �9- .,....._..... 99 <br /> ay 14, 1999 ENVIRONMENTAL HEALTH <br /> r [,J��l Swr cry/Carol oz PERMIT/SERVICES <br /> �j . <br /> aquin County Public H th Services,Environmental HeaIth'Division <br /> Weber St., Third or <br /> Wc <br /> Subject. ADDENDUM,NO. 1.TO THE PROPOSED CONTAMINATED SOIL REMOVAL <br /> AND MONITORING WORKPLAN'FOR M & M AUTOMOTIVE, 60 EAST IOTe <br /> STREET,TRACV,CA. i <br /> Dear Ms. Oz. <br /> Pursuant to your request during the course of field activities, the following modifications to our workplan <br /> dated July 29, 1998,are being documented below. <br /> On Friday, April 30, 1999, and Monday, May 3, 1999, additional contaminated soil was observed by <br /> Wright personnel and PHS-EHI) staff,'in the excavation area than what was originally estimated in the <br /> workplan dated July 29, 1998. <br /> ..According to analytical data obtained during the subsurface assessment of the site, it was estimated that <br /> _contaminated soil would not 'exceed 125 cubic yards, incorrectly referenced as 27.9 cubic yards. <br /> (Assuming.25' x 30' x-4.5'.below ground surface (bgs) area is contaminated). Furthermore the area of <br /> clean overburden was estimated at 25'x 30'x 8.5', or 236 cubic yards. <br /> I� <br /> The actual dimensions of the excavation were 22' x 26'x 12' bgs,254 cubic yards or 381 tons. During the <br /> excavation operation, saturated cbntamination was found at approximately 4 to 4.5 feet bgs, in lieu of 8.5 <br /> feet bgs.' This resulted in an excess of contaminated soil excavated by 54 cubic yards or 73 tons. There <br /> was 161 cubic yards or 242 tons of contaminated soil transported to Forward Landfill per the Temporary <br /> Stockpile Agreement No. 831011. <br /> Samples''were taken from :Stockpile No. I (uncontaminated overburden soil).and analyzed ,for TPH-G, <br /> BTEX,and MTBE under PHS-EHD oversight. Based on the results, PHS=EHD concurred with reusing the <br /> uncontaminated overburden soil as backfill. (Refer to attached analytical). <br /> Samples were taken'from.Stockpile No.2'(contaminaied-soil)and analyzed for TPH-G, BTEX,MTBE, and <br /> "LEAD per Forward Landfill's Final Acceptance criteria. (Refer to attached analytical). <br /> Samples were also taken from the excavation sidewalls, bottom of pit, ground water, and the ground water <br /> that was pumped into the holding tank prior to backfilling the site. Analysis of samples consisted of TPH- <br /> G; BTEX, and MTBE. Ground water samples also included oxygenates to be analyzed. (Refer to attached <br /> analytical), <br /> Groundwater was observed to be seeping into the excavation from the pit bottom and sidewalls at <br /> approximately 10 feet.bgs. <br /> Once the excavation was completed, ground water,was pumped into the 6,900 gallon holding tank on site. <br /> (The quantity of water contained in the holding tank is approximately 5,300 gallons). A geofabric <br /> membrane was placed into the excavation covering the sides and the bottom of the excavation to prevent <br /> pea gravel fill from subsiding into saturated'soil or silts from migrating into pea gravel overtime. (This <br /> 67 E. 10th Street • Tracy,CA 95376 <br /> 209.833.0758 • Fax 209.832.5152 <br /> Wright@inreach.com. Lic. #1651501 A-B HazMat A <br /> we&it h1tp://home.inreach.com/wright i� y <br />