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11"T.Gly.I�`J`� C � T'I Lb h'L-FiMt1`llti HL"IN <br /> AUG.'-D5' 97(TUE) 16:46 UNOCAI, C` --NORTH RETSL;S1 Q 277 <br /> F. lIU4 <br /> Jun 13, 1997 <br /> Page 3 Y W <br /> Cardbrnio,aro omm on Plate P-1 [AttWanmt D]- One municipal <br /> water supply vmD operated by Callfnm la Wafer Service is within <br /> 1,000 feet of the site. A municipal wdl opted by CallAnnia Water <br /> Service is appr=dnumdy 900 feet northeast and doom gradient of the <br /> site. According to California Water Service personnel. the Wail's <br /> subme mkt puMp is 160 fret below ground sorhm(pp. 9 8rmd 10)." <br /> Prewions Assaxments (Lr_' 1A). Site investigations began in JanuV71988 with the <br /> dmilft of five boritW dMignated ICS 1 through KB S (Figure C-2). Elevated conmrmtr'a_ - <br /> tions of total pe"Isu tm bydracwrbons(TPk1)wm8 detected in soil wnples at 20,5 feet at <br /> the bottom of Borings KrB3 and KBS (739 and 370 parts per million [ppzn])�re%mc- <br /> tiwly. Soil analy6caml data aro presented as Att'aschrnent F_ <br /> in March 1988 sift UST Ind aaxoaiard piping was rurnoved. One sem ample ftm: <br /> beneath the tank had elented con=trX6cra of toted purgeaeble p4mlerm l ydrosarrbans <br /> calcWated as smo me(TPM-8)•(582 ppm), Analytical data from Uok removal samples <br /> aro presented ed as AttadYment E. . <br /> A quarterly smundwaW monitoring acrd wrpli mg pragram was lni#iated in Fury <br /> 1988 with the insralI&d0A of Wells MW-1 *Pugh MW-3, die!moMtoring daft famd <br /> it small dissolved hydrocarbon plume to be c *Xvd in the eastern portion of the:sits near <br /> We:11 MW-2, Subwq uerrtfy►, sac a"Lionsi wells(MW-4 t2=ugh Mw-9)were irmsmiled <br /> to dcfine the lateral extent of the plume. Groundwater analytical data from the taw <br /> Wells canamed that the lspdracerbon plume is loca&zji in the area of Won MW.2 <br /> (Figmre:C-5). No SPH leas been found in any dte well. MME has beet below dd=tiou <br /> in all samples since it was included in rhe monitoring program in mid-1996. M mmdc <br /> grcmd'water analytical data am p msmU4 as Attachman F. Time most recent Qtuatterly <br /> gromrndaeaten•rnamatarinng report prepared by MPDS Swvic= and dated Jana 13, 1997 is <br /> enclosed with this report. <br /> S1E M REMMIAPnON <br /> Snit E=carratior (1,e:.)- In March-1988,all USTs and associated piping wore;removed <br /> from the site. Six soil samples wpm collected from native ally clay etapproximately <br /> 16 feet bgs in the ggsolirme Stomp tarok cavity, Obvious hydrocarboae odor vitas preseart <br /> ill three soil samples. Some evidence of=I =canination was noted in the native <br /> nlax+erial bdoW the tanks and in the walls tithe excavation. Additional W=vmrtacm was <br /> performed in en# npt to remove all obviously impacted son, The task cavity Was <br /> em JxWd tea +Ppromdtnately 25 by 35 feet, The c;mrvagon was ea;Pc dad to a tonal depth <br /> of 26 fm Aacordina to Unocal, ZWro>timay 1,104 cubic yards of hydrocarbon- <br /> impacted cm l wase-e2. oved from tlms mmxc vtWon, <br /> Sop Ya tstmetlon EVE <br /> Pm" (EVE)(La)• A 5"YE was operated at the site between January <br /> and November 1996. Hydm=rbnems were nm•i Wd from time subavfke using tinter <br /> 3t00M1e1�ktC1��C <br />