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0 R -- -- - m <br /> 7-Eleven Store#20632 <br /> • Offsite Assessment Report <br /> May 18, 2005 <br /> Page 3 <br /> SOIL BORING, SAMPLING, AND WELL INSTALLATION <br /> Permitting/Site-Specific Health and Safety Plan/Utility Clearance <br /> Soil boring permits were obtained from the SJCEHD prior to commencing field activities A <br /> temporary entry permit was obtained from East Bay Municipal Utility District (EBMUD) for the <br /> advancement of the eight borings within the EBMUD property adjacent and to the south of the <br /> 7-11 site (Attachment A) <br /> SECOR prepared a site-specific Health and Safety Plan for well installation and sampling <br /> activities at the site that Included hand-augermg, as required by the Occupational Health and <br /> Safety Administration (OSHA) Standard "Hazardous Waste Operations and Emergency <br /> Response" guidelines (29 CFR 1910 120) The document was reviewed and signed by SECOR <br /> personnel and subcontractors performing work at the site <br /> Prior to conducting subsurface work at the site, USA was contacted to delineate subsurface <br /> utilities near the site with surface markings In addition, a private utility locator service was <br /> contracted to clear each of the proposed drilling locations <br /> Soil Borings and Samphng <br /> On January 31, 2005, SECOR personnel advanced eight sal borings at the locations shown on <br /> Figure 2 Each boring was advanced by hand auger as outlined In the EBMUD entry permit <br /> Soil samples were collected at approximately eight feet bgs in borings SB-1 B, SB-1 C, SB-213, <br /> SB-2C, SB-3A, SB-313, and SB-3C to obtain soil samples below groundwater which was <br /> encountered from six to seven feet bgs in each boring With the exception of pea-gravel at eight <br /> feet bgs In SB-1A, soil encountered during the borings was rich in clay and silt, and contained <br /> no high permeability sands or gravels Soil samples were collected using a hand operated slide- <br /> hammer equipped with a bullet sampler lined with 2-inch diameter by 6-inch-long brass sample <br /> tubes by a SECOR field geologist working under the supervision of a California registered <br /> geologist Each soil sample was screened for hydrocarbon vapors with a portable <br /> photoionization detector (PID) <br /> Soil samples were sealed with Teflon`s sheets and plastic caps, then labeled and placed on Ice <br /> in an insulated container for delivery to KIff Analytical located in Davis, California under chain-of- <br /> custody documentation Selected soil samples were analyzed for TPHg, benzene, toluene, <br /> ethylbenzene and xylenes (BTEX), MtBE, tert-butyl alcohol (TBA), ethyl-tert-butyl ether (EtBE), <br /> tert-amyl-methyl ether (TAME), and diisopropyl ether (DIPE) by Environmental Protection <br /> Agency (EPA) Method 8260B <br /> Copies of field notes documenting boring activities are in attachment B <br /> Grab Groundwater Samphng <br /> Once each soil boring was advanced, a temporary poly vinyl chloride (PVC) 0 20-inch-slot well <br /> screen was lowered into the boring Clean disposable bailers were then used to purge <br /> 117-Elevenl7-11 5tores1206321Reports120632 Assessment Report 05-8-05 doc <br />