|
=December 22, 1995
<br /> Wright Project No. 4123-S
<br /> Site Closure Report
<br /> Each soil sample collected from within the excavation and associated stockpile were collected by
<br /> hand advancing a 6-inch long by 2-inch diameter brass liner into the exposed soils of the bucket of
<br /> the backhoe. Both ends of the soil-filled liner were then covered with TeflonTM film and a plastic
<br /> cap. Each sample was then labeled, placed inside a ZiplocTM bag, and stored inside a chilled ice
<br /> cooler for transport to a state-certified Iaboratory for chemical analysis. Sample identification and
<br /> chain-of-custody procedures were utilized to ensure sample integrity and to document sample
<br /> possession from the time of collection to its ultimate disposal. The sample labels identify the fob
<br /> number, sampler, date and time of collection, and sample number unique to the sample. The
<br /> samples were collected and transported according to the California Department of Health Services
<br /> and Environmental Protection Agency protocols. All sampling equipment and brass liners were
<br /> washed prior to and between sampling events in a trisodium phosphate (TSP) detergent solution,
<br /> then rinsed in clean drinking'water and final rinsed in deionized water.
<br /> The soil stockpile samples collected by Wright personnel were signed over to BTSI personnel
<br /> under chain-of-custody documentation for transport to the laboratory. The excavation soil samples
<br /> collected by BTSI personnel were also transported under chain-of-custody documentation by BTSI
<br /> personnel.
<br /> 6.5 Laboratory Analysis- Soil
<br /> The soil samples collected from within the excavation (ESW-1 through ESW-5, and EBS-1) were
<br /> analyzed by Priority Environmental Labs (PEL), a state-certified laboratory located in Milpitas,
<br /> California. Each soil sample was analyzed for the presence of total petroleum hydrocarbons as
<br /> gasoline (TPHG), diesel (TPHD), and motor oil. In addition, each soil sample was analyzed
<br /> discretely for the presence of volatile organic compounds (VOC) and five priority metals
<br /> (cadmium, chromium, lead, nickel, and zinc). The TPHG, TPHD, and motor oil analyses were
<br /> conducted utilizing methods 8015/5030 and 8015/3550 with a silica gel clean up. The VOC
<br /> analyses was conducted utilizing method 8240 and the metals were analyzed by method 7130,
<br /> 7190, 7420, 7520, and 7950. Tables 3A and 3B present a summary of the analytical results of the
<br /> soil samples collected from within the excavation. A copy of the laboratory report and associated
<br /> chain-of-custody documentation for these soil samples is included in Appendix B.
<br /> The soil stockpile samples were composited by PEL into two samples, designated as Composite
<br /> Sample A and Composite Sample B. Composite Sample A consists of soil stockpile samples
<br /> COTSP-1, COTSP-3, COTSP-5, and COTSP-7. Composite Sample B consists of soil stockpile
<br /> samples COTSP-2, COTSP-4, COTSP-6,and COTSP-8. Composite Sample A was analyzed for
<br /> the presence of TPHG; TPHD; motor oil; benzene, toluene, ethyl benzene, and total xylenes
<br /> (BTEX); total recoverable petroleum hydrocarbons (TRPH), halogenated volatile organic
<br /> compounds (HVOC), semi-volatile organic compounds (SVOC), and five priority metals
<br /> (cadmium, chromium, lead, nickel,and zinc). Composite Sample B was analyzed for the presence
<br /> of TPHD, motor oil, and TRPH. PEL utilized methods 8015/5030 and 8015/3510 for the TPHG,
<br /> TPHD, and motor oil analyses. Method 8020 was utilized-for the BTEX analyses and method_
<br />- 418.1 was utilized for the TRPH analysis. The HVOC analyses was conducted utilizing method
<br /> 8010 and the SVOC analyses was conducted utilizing method 8270. The metal analyses were
<br /> conducted utilizing methods 7130, 7190, 7420, 7520, and 7950. The analyses requested for the
<br /> stockpile composite samples were consistent with the requirements established by Altamont
<br /> Landfill, a Class II landfill located in Livermore, California. PEL utilized methods approved by
<br /> the Central Valley Water Quality Control Board and the Environmental Protection Agency. Tables
<br /> 4A and 4B present a summary of the analytical results of the soil stockpile samples. A copy of the
<br /> laboratory report and associated chain-of-custody documentation for these soil samples is included
<br /> in Appendix B.
<br /> 6
<br />
|