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; <br /> [ <br /> Y\ JI <br /> I r'e L <br /> SIERRA <br /> s� <br /> not used for drinking supply. Dulne tic water wells..tpprowimztely 600 feet deep, are also near <br /> the.site: actual well location`;%vere not delerauined for this report.' <br /> 2. SUBSURFACE EVVESTIGATION <br /> e, ' 2.1 Soil i3orings and Monitoring Well Installation <br /> On May 2 and 3, 1991 three soil borings were drilled at the site and]monitoring!wells were <br /> installed in tlieni. The wells were drilled andinstalled by Solis Exploration Sc:ices of Vacaville, <br /> k <br /> California using a lir,ilow-stem auger drill rig. The wells were installed to determine the presence <br /> or absence^of hydrocarbons in soil and ground water beneath the site,and to determine ground <br /> water Row direction and gradient. <br /> MW-1 was installed just cast of the.prittaping islands. Monitoring we_ls MW-2 and MW-3 <br /> were installed west of the tanderground fuel tanks :.Figure 3, Appendix A}, he wells were <br /> constructed in accordance with SES Standard Operating Procedure-Monitoring Well Design and <br /> Construction(Appendix Q. Wells Mw-I a.t,l MW-2 were intended to provide downgradient data. <br /> May 9. 1991 ground water data indicated a northeasterly ground water flow direction beneath the <br /> site. <br /> Soil samples were collected and logged in accordance with SES Standard Operating <br /> Procedure - Logging Method and soil samples were collected in accordance with SES Standard <br /> Operating Procedure - Soil Sampling(Appendix C). The soil samples were screened during field <br /> operations with an OVM in accordance. with SES Standard Operating Procedure, OVM Use <br /> (Appendix Q. <br /> s :+ <br /> Sandy silt and clay was encnruttcred in all Utc bo:iogs from approximately 1 fl belowgradc <br /> to approximately 29 ft below grade where tale wells were terminated. Low readings were recorded <br /> to <br /> • tvuh the OVM during shal:ow rlrlliiug of borings MW-1 and MW-2 (Appt:ndix D}. The OVM <br /> Y t <br /> 4 <br /> IlollBsgstvurth, 1Va}'nt•, 199t, Iclrtsh mr convcrsution b,.t%V tri Cline Rogers, Ctnc'rort ErtginLY.r eut ayne <br /> N!I 0302,Manh 21, 1419 L <br /> I Ioflljlpworlh,I Itlllop I)evclojwrr,t-c-gardlog%volls near Chcwmr+Slutlort <br /> .� Page 5 <br />