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y <br /> tMITm , <br /> DN 1 LL I NG, WELL CONS-f W-ICT l UN AND Srah PL I N(? F•R rQ JL <br /> DR I L.Ll I'1G <br /> Prior to any drilling :.r excavation activitierw, <br /> Underground Service Alert (tj'.;A) will be contacted tc- mark all <br /> underground utility liriL�s iri tt� , vicinity of the proposed <br /> work.. All necessary permits will be obtained ar,d 43 hour <br /> notification to the lead agency will be given prier to the <br /> c_ommencerleni; of drilling. <br /> Borings will be drilled using hollow-stem auger with no <br /> less than 3 1/4-ir:ch diameter (ID) acid 6 3/4 oartside? diameter <br /> (OD) . All drilling equipment will be thoroughly stea.rn- <br /> cleaned before drilling begins to prevent the introduction of <br /> contamination from ofF-site, and between borings to prevent <br /> cross-contarninat ion. <br /> All borings will be bagged by a qualified geologist <br /> using the Unified Soil Ctrs ii.ficaticn-, System. The color, <br /> texture, rnoisture, plasticity (if applicable), consistency, <br /> pertinent sails or bedrock characteristics, and any evidenr:e <br /> of contamination will be noted or, the logs. All water- <br /> bearing zones and the depths at which they were encountered <br /> will be noted on the logs. All logs will be reviewed by a <br /> California State Registered Civil Engineer and ver-fied <br /> correct. A sample of the material lagged is to be collected <br /> and retained for further analysis and verification. <br /> The borings will be driller: in such a manne:t as to <br /> prevent cross-contarflination between strata. Exploratory soil <br /> borings will be backfilled with a bentonite or bentonite and <br /> cement slurry. If a deeper aquifer is to be investigated, <br /> conductor casing will first be grouted into place to seal off ' <br /> the upper aquifer(s), in series if necessary, and drilling <br /> will procr-?d thr nigh the conductor casing after the grout has <br /> been allowed to set properly. If evidence of contamination <br /> ic: anted during drilling, the drilling will be halted until <br /> the responsible professional det;: rmines the advisability of <br /> deeper, drilling. <br /> Upon te?rrnination, borings into the saturated zone will <br /> either be completed as monitoring or extraction/injection <br /> weals, or backfilled with a bentonite or cernent slt_rrey. All <br /> borings for .iyey15_Wi.1.1.-.be-_`f -a..-.diameter. ;t....-least-.-t+.....irsche- -- -... ----.--. - - <br /> greater than the inside diameter of the well casinq to be <br /> used. <br /> The euttir-1 the r.`r^filling operation w`II be <br /> containerized in plastic 5L-gallon drums and st,:=reel nr:-site <br /> for later' treatm nt and/or' disri-1 zl. The treatrirE nt/di<,po5a1 <br /> will rewair, tilt re-5por,e,ibility of rhe client mr,less ether <br /> arrangergent�y have been made. It is intended that the <br />