Laserfiche WebLink
Rrelo0i <br /> KEl-J91-0202.R1 <br /> April 9, 1991 <br /> Page 3 <br /> SW-S, SW-E and SW-W,l were collected from the <br /> labeled SW-N, a de th o€ approximately 25.5 feet€ <br /> samples' backhoe. Samples <br /> sidewalls of the excavation at P by le point <br /> below grade, also from bulk material viously <br /> excavated <br /> described. Sample <br /> Figure <br /> 2. <br /> Site Plan, Fig <br /> were taken and handled as P ling. <br /> locations are as indicated o oohs. etfor efurther same <br /> Excavated soil wasstockpiled <br /> REGIONAL GEpLGGY AND SUBSURFACE CCNEI IONS <br /> eared to consist <br /> used in.the excavations.app which.f <br /> h of .abouts feet below grade,..... <br /> The subsurface soi-s exp th explored ? <br /> primarily of sand to a depth clay to. the maakimum' dep. <br /> silty ] .was not encountered <br /> are, inturn .underlakn byrade Ground water explored (26 feet) . <br /> (about 26 feet below g ) ' depth of Rancho <br /> within the excavation to the maximum <br /> em <br /> the ground water table in the Lodi area <br /> r atover <br /> Based on recent communication with West Hazmat Drilling <br /> 65 <br /> Cordova, California, ed between approximately <br /> the last several years has rang <br /> feet below grade. <br /> roximate center of the <br /> The subject site is situated near the aPP and is situated <br /> Central Valley geomorphic province of California, <br /> qu n Delta area. The <br /> northwestward-trending, asymmetric <br /> adjacent to and east of the Sacramento-San six vertical <br /> Central Valley is a larger to <br /> th <br /> structural <br /> trough that has been Valley upup to 10 miles of <br /> miles of sediment in the San Joaquin <br /> e Sacramento Valley. <br /> sediment in thGeological Survey <br /> conal geologic maps (U.S. s of the <br /> Based on review of reg Ma ogMF-1401 "Geologic Maps <br /> California" by Brian F. Atwater, <br /> Miscellaneous Field Studies P the Pleistocene Modesto <br /> Sacramento-San Joaquin eDist underlain by of the site <br /> 1982) , the subjectwhich <br /> Formation (Qm) . The Modesto Formatioofi�o se sandansilt, the <br /> typically consisting deposit of <br /> is described as tYP representing an alluvial fan <br /> is chiefly fluvial, P ng a average thickness of about 10 <br /> Mokelumne River which has aunderlain by compact, unweathered silt. <br /> considered to be underlain by the <br /> to 15 feet and is commonly <br /> The Modesto Formation is <br /> Pleistocene Riverbank Formation. <br /> ANALYTICAL RESULTS Laboratory in <br /> zed by Sequoia Analyticalexecuted Chain <br /> All sampiEs were analyzed <br /> All fuel tank pit and product pipe <br /> concord, California and were accompanied by properly toluene, xylenes and <br /> of Custody documentation. zed for benzener unction with <br /> _...---- - and <br /> -------trench- were analyzed _in con? <br /> BTX&E) using <br /> ethylbenzene ( EPA methods 3050 and ..7 �-- - <br /> method 8020, for total lead using <br /> for ethylene dibromide (EDB) using EPA method 8010• All fuel tan <br />