ARCHIVED REPORTS_XR0008059 - Laserfiche WebLink

Home Browse Search

T. nlz M.a: 28-November 2001 •AGE-NC Project No. 96 0229 Pa De 3'of 6`.7' atdepths between•25 feet-bsg'arid 45 feet bsg;Second Water.Zone was identlfied=atdepths'64iw"en .. C 60feet _and 15 feet bsg aiid Third Water Zone was identified.at'Vepths between 80 feet bsgVand z :total depth feet 1isg). Based`ori,Cross Sections C_-•C'-and D=D'; Second Water Zone-arid Third - �- Water.Zone'a' have vertical_communlcation west of the UST pit due to thinning or absent fine grained-units - t � - s 2.4 GPT DRILLING:AND GROUND WATER COLLECTION PROCEDURES .- A 25 ton:truck-mounted CPT-drill rig equipped with.2-Inch diameter liallgw stein rods fitted-with j a ydroPunch ground-water..sampling tool utilized a_hydraulic ram to advance'`t, spec Hified'deP the -=- - p 'in each adjacent soil boring:.A HydroPunch,sample_tool,was pushed into the specified zone;then- _ withdrawn approximately three feet to expose an'inlet screen: The iritenor of the-sampling-tool filled ;ry -with waterand:.a�Y2-inch•louter-diameter- .O.D.• :stainless steel bailer;was lowered-and.utilized extract'a-ground water sample. Ground water sample-s-were collected from,each depth interval_(zone)=. based an previously,acquired CPT litholog' data indicating favorable conditions for sairlplingi. - : ground wateriri each identified informal hydrologic unit.= .:x u - a ■■■■7j{@F�� _ - All nnseate_generated-by drilling.related• activities was containerized in properly labeled-DOT .. , approved 55 gallon drums, and was stored.on�site In an area Tacking public access All soil borings were backfilled over_thelr entire depth with a,portlarid:cement grout mix ` - x - E Following sample collection, eaclpreserved sample`was logged on a chain-6 custody form;1placed. ` in a chilled.cohtainer and transported to a California Department of Health Services(DHS),certified z 'laboratory-for-analysis for y Total petroleum hydrocarbons quantified as gasoline'(TPH g)< 03 by EPA Method 50/$O1 SM,. Volatile aromatic compounds including benzene tolticne,.ethylbenzene-and xylene(BTEX) with oxygenated compound methyl tertiary butyl-ether"(MTBE)by`.EPA Method 8020;and =� z Volatile organic compounds including methanol, ethanol; ethylene dilaroimide'{EDB);.1,2= dichloroethane(1,2=DCA),tertiary butanol(.TBA);di=isopropyl ether(RIPE),:ethyl tert.butyl _x j ether-(E I BE),_cert amyl rriethyl ether(TAME).and methyl tertiary�buty-1_.ether(MTBE) by �= EPA Method 8260A. . . -2.5. LABORATI Y RESULTS.OF "GRAB" GROUND.WATER-SAMPLES `*, A total of eighteen'(18)"grab".-ground waier samples were collected from borings P:-10, P 11;,P-12; 4r 4Y P=13 and P-14 and submitted for laboratory analysis for`th6,above mentioned-constituents At least 1 ` rA dvunced Gw f nvironpe 61 Inc. Win+ r -, s - - _ re•. YI - '._ Y1.7" er-3rS _ .-F. <-, .__ , •- ,v-,s x,.. _ _x.._. ._.._ r- '� .-s,..v r _. , •...�' _a_ r r _ .Y;- _==rr :<, ' _`..,fir. .--"4.' - "'" _