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c ��".rri'a �-�. ` - s�Ti'"°� � 7� I v� e` .tN, ,mss ;r�'� �R s�+.� ..a �S-,.���.,� �. �.. G�,,,:.�.. r.• <br /> }y.,. =yr- r` ..` Jc .,-r�`dr , •sk.�r�fig. -�fi .f' ': c`x ,M*qy.„�' '#":a�^.v_' 'iF'� Mr.,'0.i�v.: <br /> a <br /> 4 <br /> SIERRA <br /> a Z. INTRODUCTION <br /> 1.1 Scope of Work <br /> This report presents tete results of the subsurface investigation conducted by Sierra <br /> Environmental Sen•ices(SES)at Chevron Service Station:i;l-0302 located at 6421 Paddock Place <br /> in Lodi.California(Figure 1.Appendix Al. the objective of the SES investigation was to detemitne <br /> the presence or absence of hydrocarbons in soil and grortnd water beneath the site. The scope <br /> of work for the investigation was to•, <br /> 11 Prepare a site safety pian specific!(,this investigation. <br /> 21 Drill three soil borings and collect soil samples for subsurface sediment and <br /> hydrogeologic cdescriplion.and for possible chemical analysis. <br /> 11 Survey the soil samples in the field with an organic vapor meter (0VM) to <br /> determine if vnlatile hydrocarbons were present in the samples. <br /> 5) Analyyic selected soil samples at a Chevron-designated laboratory for total <br /> purgeable petroleum hydrocarbons as gasoline [TPPH(G1) and diesel [TPH(D)). <br /> benzene. toluene. ethvlbeilzerte and xylenes(13TEX). and total lead (Pb). <br /> 6) Install three 2-inch diameter ground water monitoring wells. <br /> 7) Develop and sample the wells. Analyze all ground water samples for TPPH(G). <br /> TPH(D), 13TEX. and organic lead. Analyze a ground water sample from the well <br /> •.. nearest to the sanitary sewer line for fecal coliform. <br /> 81 Survey the t up of casing elevations of the new wells to verify the ground water flow <br /> direction and gradient beneath the site. <br /> e.w <br /> 9) Arrange for disposal or the drill cuttings and well pm-go water. <br /> 10) Report the results. <br /> ,. 1.2 Background <br /> �w <br /> The Billowing site history Mforliratiorr was obtained ICotn Tor.Clint Rogers ofChcvro,ii USA. <br /> io f <br /> fit Page 2 <br /> iLq <br />