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samples were collected, Preserved and transported under chain of <br /> �- custody in accordannce with standard EPA protocol. � �" <br /> ��:f��.a;��:z��.'esat~� �s'�bE-«.3.n��3 ,�.�3rt�naa,L�►'�Z`� g�r+r�A _ <br /> for benzene, toluene, xylene ~ <br /> hydrocarbons as gasoline (TPH) by Ca ifornia Department of Health <br /> Services testing methods. <br /> 2.2 Monitoring Wells <br /> The three soil borings ereiVm=fpj:4e t43dd! as t n YLI"1F�d�;p1#s fB:�` <br /> Specific details of the well <br /> completion/construction are included on the individual logs <br /> (:Appendix II) . Subsequent to completion, the wellheads were <br /> surveyed and all elevations tied to a common datum. <br /> After completion, the wells were developed by hand bailing a <br /> minimum of four well volumes (casing plus sandpack) . Groundwater <br /> �. samples were collected using a teflon bailer and contained, <br /> preserved and transported to a California certified laboratory in <br /> accordance with EPA protocol. The samples were analyzed for <br /> benzene, toluene, ethylbenzene and xylene (BTEX) by method EPA <br /> 602. Water level measurements, summarized in Table 1, were taken <br /> after well developement using a conductivity probe. <br /> 3.0 SUBSURFACE CONDITIONS <br /> 3.1 Field Inspection <br /> The soils encountered during drilling consisted of� %ZwTdy'Mj�ays�4wthe maximum depth <br /> explored. In ger��ral, 'an '1°nt:erval of clay lies above and beneath <br /> ry a section of sandier sediment encountered between..6 and; 16 feet <br /> below .>. � n. <br /> grade. �u tttY'atesd°= stDi'Ts: were' first"�`n0 `at .approxima �y <br /> 4 et below �a a d :TstatYc titer leve sistabilizad at between <br /> calculated fo;"��tsw{dI'able 1) . The groundwater gradient <br /> r the January 7 and 19, 1988 water level surveys <br /> recorded a v . <br /> A� ant• v. rgas e�nia � <br /> {Figu �� � , ....Rti •z ,.�,� t � <br /> Field inspection noted a vt ri=sl-tzyht gaso3frle rodor:=uin::sandy-:;silt <br /> s[�i'Is 3t. g4 tcs^�31.3rfe:et• cin bori�g:� with no detectable product <br /> odors in any of the other cuttings. Soils from borings 1 and 3 <br /> did not record any product odors during drilling. <br /> 3.2 Laboratory Analysis - Soils <br /> f„ - <br /> ""-� Laboratory analysis of soils did"�"�tot: :' enprd;_ :the _pzesgna .aP <br /> o ? "Zee=hyii'c6cgrbo238BTX or TPH) at levels above method <br /> detection limits. The laboratory data sheets and the chain of <br /> custody form are contained within AD <br /> pe4 <br />