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David and Marianne Warwick Heritage Square UST Tank Closure Report Page 3 f L Table 2 SummaKy of Anal tical Results for PNAs and CAM 17 Metals L Sample ID: TB-1,S-2-21.5' Date: 7/26/02 r Ai ai ical Result Anal cal.Result PNAs RL(mg/kg) m k CAM'117 Metals RL.(mg/kg) .k iVr 2-methylnaphthalene 10 <10 antimony 0.25 2.5 acenaphthene 10 <10 arsenic 0.25 8.5 acenaphthylene 10 <10 barium 0.15 160 1V benzo(a)anthracene 10 <10 beryllium 0.15 <0.15 henzo(a)pyrene 10 <10 cadmium 0.15 <0.15 benzo(b)fluoranthene 10 <10 chromium 0.15 45 nezo(g,h,i)perylcne 10 <10 cobalt 0,15 12 benzo(k)tluoranthene 10 <10 copper 0.15 41 chrysene 10 <10 lead 0.25 12 Ln dibenz(a,h)anthracene 10 <10 mercury 0.10 <0.10 tluoranthene 10 <10 molybdenum 0.25 <0.25 r fluorene 10 <t0 nickel 0.15 47 Mr indeno(1.2,3-cd)pyrene 10 <10 selenium 0.25 <0.25 nap hthacne 10 <10 silver 0.15 <0.15 t phenanthrene l0 <10 thallium 0.25 <0.25 i.. pyrene 10 <10 vanadium 0.15 57 zinc 0.50 44 Motes: RL=1.aboratory reported detection limit Mg/kg=Milligrams per kilogram=parts per million(ppm) UST Closure The UST is located very close to the structure at the site as shown in Figures 2, 3, and 4. The top of the five-foot diameter UST is located at a depth of eight feet bgs. Any attempts to excavate and remove the { tank from the site, as is conventionally done to permanently close a UST, were determined by Condor to iV pose a threat to the structural integrity of the structure. The mitigation of these threats would require engineered solutions at considerable expense to the client. Additionally,the nature of the contamination at ` the site has no established regulatory requirements and does not pose a fire or explosion threat. The San #� Joaquin County Environmental Health Department (EHD) and the City of Stockton Fire Prevention Division (FPD) had no objections to Condor's recommendation to permanently close the UST in place. 0 On August 12, 2002, a Condor representative was on site to coordinate the permanent closure of the UST. Ms. Michelle Sterni-Le of the EHD was on site to observe the closure process. Ms. Sterni-Le also acted 3 on behalf of inspector Kent Miller of the FPD, who was unavailable. Approximately 200 pounds of dr ice was laced in the UST to evacuate oxygen as and an remaining pp Y p Y p Yg g Y g petroleum hydrocarbon vapors. An oxygen and lower explosive limit (O,/LEL) meter was used to monitor the evacuation. Prior to filling the UST, the oxygen level inside the UST was 61/6 and the LEL was 0%. Approximately 7.5 cubic yards of three-sack concrete was funneled into the UST through the fill pipe. The monitor pipe was used both as a breather and to inspect the concrete level. Concrete was added until it protruded from the monitor pipe to verify that the UST was filled entirely. imp V A ' i11 CONDOR Lo