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„ r <br /> 'C J �Qa9 I fiydrmnolnat� ee���� . <br /> I Moreland Court Shelt <br /> 7708 Moreland Court,Stoektao,Crilfornin <br /> Delta F-Itct Na 40418-146 <br /> Page 4 <br /> 5 VNe )<nvento <br /> An inventory of e:dSting domestic and municipal water supply wells near the site was initiated on fiebntary <br /> 72, 1959,by a Delta representative at the California Department of Water Resources(DWR. Accordi� <br /> to DW12 records, 25 wens have been ide } g <br /> � nttfled within ahalf--mile radius of the site. <br /> ! Z`6_Reglonpl.Geolo�r and Hvdr3eln , <br /> Stockton lies within the Great Valley <br /> . ey geomorphic province The regional geology consists Of <br /> ullconsolidated depocits of sand,silts,and clays which were de m✓ <br /> t«, posited in fluvial and deltaic environments. <br /> f <br /> A regional <br /> l map showing the ground water em.;gon ! . <br /> CaWours for tie unconfined aquifer for the fan of <br /> 1985 indicates ground water is at a!"eoth of 30 feet b,:iow ground surface and <br /> southwest(uWR, 1 _ _ bencrally flows toward the <br /> r 2.7 Site Ge�lo <br /> Subs rfac.e geology at the site has been Weried from cirilliag eight€ail borings at tete site. `soil borings <br /> Sly-1 through S_-”weredrilled duringthe <br /> pre tank pull assessment,while soil borings SB-7 and SB-8 <br /> advanced�furing the Phase I investigation <br /> I I:iguri 3 shaves the surface trace of cross-seetton A A Cross-section A A' presents the inferred <br /> r . <br /> distiibutian of sails beneath the site and is shown in Figure 4. Silts and clays predominate from ground <br /> 1".to approavmatcly 25 feet.below grade,wherebj a water bearings't_y sand is encavatzred_and appears <br /> : -- <br /> to.be ccntmuaus across the site. This silly sand layer was first encountered in sail <br /> � boring SB-7 at a depth <br /> of 29 feet below ground surface and in soil boring SB-8 at a depth of 24 fret <br /> In We vicinity of the former tank excavation,a clay layer is present and Wands from ground surface to c <br /> w -appraaatmately 24 feet below grade. This clay fryer is approximately 11 feet thick beneath the backfill of . <br /> x stir <br /> the former tank excavation (Figure 4), <br /> R <br /> TES x - ---- - - - -- -- - - - - --- <br /> a <br /> 10 <br /> W <br /> II`4`f` FT. <br /> LY <br /> 'cc 5 ra �i <br /> BE <br />� I <br /> t <br />