Laserfiche WebLink
a �+ <br /> .12 <br /> March,_1999 �. r <br /># , �AGE_NC Project No 9.5 0128 <br /> Page 2 of 5 x- E <br /> z <br /> y-,. _ ..f } <br /> 2.2. ,GROUND WATER S AMPLE COLLECTIONzy <br /> _ <br /> �r _,,. - '�... � _Tom' s. .ew t •�y-.� <br /> A 'water sample; was.collected from each well using a new-,--c1 clean;disposable glastic bailer <br /> Immediately upon retrieval;.samples were transferred.-roto-three 40-m1 EPA-4pproved:VOA'vials K <br />{ -containing 0.5 ml I$% hydrochloric=acid as a sample preservative and'into a one'lite' amber'bottle`P- <br /> F' _ <br /> Without-the preservative-.'The samples-were,logged'on a chain of custody-forri�;-stored in a-c"billed, <br /> container:and transported under chain of custody to M Cain 'bell Analytical h c.'(MAI),a California _ ' <br /> Department of Health Services HS -certified laliorato The round water sam les were anal zed <br /> p : ) ?Y <br /> s in accordance with: p 'y <br /> i EPA11lletliod 9015M for'total petroleum'hydiocarbons quantified'as gasoline (TPH.-.g)21 <br /> , .� <br /> + <br /> hy <br /> EPA Method 8015M for.total petroleurri drocarbons quantified as diesel (TPH`d};=;ti ` <br /> i - '_• EPA­'1Vlethod 8020 .for .volatile�aroinatics (benzene, toluene, ethylbenzene- and xylene-7.�` .. .,• , <br /> BTEXpc <br /> };and " <br /> EPA:lvlethod 8260 arid.8260Mfo-r volatile organic compounds (VQCs) and oxygenated fuel } <br /> additives: di-isopropyl ether'{DIPS), ethy'1 ter iaty butyl ether,(ETBE),r.methyl-tertiary butyl s <br /> ether MTBE. ,tertia-` but ] alcohol TBA -and testi azn l meth 1 ether TAME <br /> { ) y - Y ( ) �' Y Y { ) <br /> r' - - Y .L A���-a - '�`' - -tea �--�_ � ,r _ -if � V - �s _� +• . .�i� ,ra -r - <br /> 3.0. FINDINGS.. - <br /> z � <br /> The casing elevation of each,well has previouslyybeen surveyed relative io-a Cit Stockton-bench � <br /> .mark: Ground Waterelevationi were.detm-nined by'subtracting subtracting the,m.easured.depihs to-watet-.frorri� <br /> t <br /> w the casing' elevations:.-Ground water`flow clirect;ori=was' determined by .contouring the.=water ` x <br /> elevations on a;scaled :site ' lain,(Fi ure 3 f' The concentrations ofAirs olved hydrocarbons and m 7 r <br /> oxygenating-,compounds'iw the.waier. sample:.were,.reported'in -the analytical report-issued by.' <br /> t - McCaxxiphell.'Analytical, Inc dated'12 January'�1999:-'Field data are;included in Appendix;A,.the- . k <br /> laboratory report is included in AppendixrB � <br /> s� <br /> 3A rGROUND WATER ELEVATION AND GRADIENT t <br /> 44 <br /> Y The average ground water elevation-on 31 December 1998 was approximately 2.-55 feet lower than <br /> the average round water elevation on 15june 1°,9W$ Ground water iii moriitorin wells MWl MW2--` <br /> - and MW3 was approximately.28.3-feet, 21_.S'feet-and,20.S-feet over the tops of the wells';screened_' <br /> 4 interval's, respective-ly.The_ground wAtet table.:occurred Within the_screened intervals of the other-: <br /> 3-wells ihonitared-'Ground water was inferred to-be #lowiiig soine'what radially 'toward the east°toN. <br /> " S`- <br /> �- <br /> ILI <br /> iiortheast on the_site; at an app%;oximate'gradient-of-0 0017 <br /> Y'AdtiancedGeoEn<<ronmental Inc a =� <br />