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. I I February 2003 <br /> AGE-NC Project No. 98-0520 <br /> ' Page 5 of 7 <br /> Protect]on.Agency, 1985). Prior to mobilization, the area of excavation will be clearly marked and <br /> a utility clearance obtained'through,Underground Service Alert. <br /> 3.2. SOIL AND GROUNDWATER SAMPLE COLLECTION AND ANALYSIS <br /> ' AGE proposes to.advance two soil probe borings using direct push technology(geoprobe)to further <br /> assess for petroleum hydrocarbon-impacted soil and ground water beneath the site. The proposed <br /> soil borings will be advanced to approximately'30 feet bsg; the total depth and proposed locations <br /> ' of the soil borings may be modified due to field observations. The proposed sail boring locations <br /> are presented below and on Figure 2. <br /> ' One boring approximately 65 feet northwest of MW-8;and <br /> • One boring approximately 125 feet northwest of MW-9. <br /> ' h eac <br /> As boring n <br /> . bo g is advanced,soil samples will be collected at 5-foot intervals beginning at 5 feet bsg <br /> and extending to the total probe boring depths. In addition,grab ground water samples will be taken <br /> in all five borings at first-encountered ground water. Field procedures for advancement of probe <br /> borings and collection of soil and groundwater samples are presented in Section 4.1. <br /> ' Ground water and selected soil samples from each probe boring will be submitted for laboratory <br /> analysis. The selected samples will.be analyzed by a State of California Department of Health <br /> Services (DHS)-certified laboratory for the following constituents: <br /> ' Total petroleum hydrocarbons as gasoline(TPH-g) and'diesel (TPH-d) in accordance with <br /> EPA'Method 8015 Modified; and <br /> ' Benzene,toluene,ethylbenzene and total xylenes(BTEX)and the fuel additives methyl-tert- <br /> butyl ether(MTBE), tertiary butyl alcohol (TBA),"di-isopropyl ether(DIPE), ethyl tertiary <br /> ' butyl ether(ETBE) and tertiary amyl methyl ether(TAME),1,2 dichloroethane (1,2-DCA) <br /> and tertiary butanol (EDB) in accordance with EPA Method 8260 Modified. <br /> ' In addition, selected soil samples will be analyzed for specific gravity (including soil moisture), <br /> -porosity/permeability and total organic carbon (TOC), in accordance with ASTM Methods D854, <br /> D5084 and D2974, respectively'. Laboratory reports for soil and ground water analysis, testing <br /> methods,laboratory quality assurance/quality control(QA/QC)reports,and sample chain of custody <br /> documentation will be presented in a report of findings and recommendations. <br /> Advanced GeoEnvironmental,Inc,' <br />