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' 02/25/1995 04:45 12098925152 WRIGHT ENVIRONMENTAL PAGE., 92 <br /> 0A-13-1995 12=55PM FROM MLMER CEO TO 12o9e=152 P-02 <br /> Ig <br /> April 13, 1995 <br /> Project No. 4062-R <br /> wsaux Joaquin County <br /> i Public Health Service-l?nvirnamental MOM Division 1 <br />' 445 rf, Si6m ivaquitt Street i <br /> Stvcktaaa. CA 95201 � <br /> Alto-, lis. UvAa Tutkat l <br /> t <br /> K to; Addendum I* the '�ES W urlt PIAn Vatted April 6, 1, for <br /> Subsurface Soil trod• Groundwater Sattuplitug and vadese Well <br /> Ectstallatfort tea4l Modification., <br /> - <br /> Waterloo 5clwol 7"7-1N. Pezzi Road, Stvcitton, CA <br /> Dcox Ms_ Turlruttc, <br /> Wright Sgvironme tan Scsvicvs, Inc. (W1rS) boss lroPsrad tltls- taddtVJUM to <br /> rworkplon datard April 6, 1995 for *e above referenced site. As you know •eve <br /> diicusmd this addendum io Mut 1019pf one conversation of April 13, 1995 regarding <br /> the Public Health Agency4Eavitoamental Diviai bo (PROEND) concerns and daaire <br /> reganiiug interim, site cleanup acrd kek of hinds of dw Waterloo School (School). <br /> Introduction and Technical Approach <br /> It is vol' onderxtaanding ftt an interim vadww as akonup is dejired ttt dais time'.by <br /> PHDEHD given limbed ScWwl' farads. At the same time, the suuudwater issue tree& <br /> to be -alddreiised since the provious eoaashaw did not install a monitoring well t4 <br /> 'r groundwater, hat completed it as an excessively scte ezed vapor monitoring well_ <br /> Consequently, the groundwater quality at tho spill Source is ttnk0oowo several years <br /> after the fact Also tate design vF the existing well is quenionabie and may emscut <br /> vatdast stluitaat43 which Coapt hare been tetarding horilOw to vortical a:.uptartaiU514t <br /> ' 1*t7�fA11ot1- <br /> Soil oonta urination in the vxduse zone Stats been Q21y partialllr defined, "with data gaps <br /> at the depth intmatl of abaft 26.5 feat to 56 feat, and below 82 feet The higbeet: <br /> ootaceptrations of Total Nitoleum Hydrectarbe as as Gasoline (TPFIG) observed were <br /> 7,500 parts per million (ppm) and 13euctte at 35 ppm at the 26.5 foot depth. <br /> Grcmtdwuter is anticipated to occur at detl s of raver 100 feet, and the inuallation of , <br /> gtoundwater monikm* wells at dais time would pose at burden to the budget of the. <br /> Schcmi. Also, the PHDEHD desires chart i*me cleanup action occur at this time which M <br /> should aid in cisamxp and attempt to maximize ibe Scbouls limited funds. <br /> 1 WES feels that grouttdwaier gmlity should be ad&vssed at &is time, at loast to The <br /> 'E reoaunais"Zwe level, no the School b" some data rogatrd1mg the current conditions. � <br /> Also some. additio l aaail dais. •is needed to a"auin what contaminants if any are <br /> prceeant at the 25 foot to 36 foot i11twval, amd belvw 93 feet to this way, the Scboaf <br /> will have at genwal kmmledp of existing co"tions in tlta vadose Sail columaat and .at <br /> gmundwaier. At the =me time, a Pilaw vadow zona; well will be in=11W, toge6cr. <br /> with rnodificatious to the existing well, will tunable a limited sballow -vatdose tone. <br /> Cleanup to begin at the depth interval of highest a iomeeMxa►tiatns identified.. <br /> Watertvo Addendum PW 1 M <br /> 1961 Iii tl mew Way Tracy,California 95376 <br /> Tetepbone( 833-HISS Fax{ 1632-5152 <br /> i <br />