|
r , Mr..Harlm. Knoll <, :, �w k r•
<br /> ;.May 10, 19(6
<br /> '.Page 2"N11
<br /> ,The.three groundwater wells have been monitored quarterly for five quarters: Quarterly
<br /> :monitoring results have'shown Benzene, Toluene,'Etlylbenzene,.and°Xylenes (BTEX)
<br /> � . -x
<br /> ' . _concentrations)well'below California Action Levels but far one.exception Iii August, 1991 y
<br /> �= benzene was found at the Califorma Acttori'.Level'm 11rIW 2 but wasYnvt confirined during_;
<br /> x , x, }, ri . ...
<br /> . the next quarterlymonitonng :,.This was `tlie only occurrence of aienzene iii'any quarter . ,
<br /> rt .,monitored. „Based ion these results, ESE requested site closures from the..PHS/EHD On"two
<br /> `separate occasions Site closure<was denied: -
<br /> In telephone conversattons and a letter tb'the PHS/EHD.dated j - "December 1$,=1992,;ESE
<br /> proposed to install twosoil borings in thearea5 of soli bonng B=2Y rather`than'installing an
<br /> o-additional ground'waiddr.' onitoring Well'at-the site: However,` as stated xn their letter,dated
<br /> ,
<br /> March:2- 19031993 the`PHS/EHII'.r'equires`xhat:in addition to drilling soil borings m-the vicinity-
<br /> } ,
<br /> r ,
<br /> --,of B 2Y; ,one additional`;monitoring well should ,be installed .dowrigradient of.;B=2Y,-
<br /> T,telephone conversations with IVir:Harlin Knoll, of:the PHS%EHD,`the additional well`must
<br /> 4be located west and'downgradient of the former tank excavation Figure 1Site Map.'shows' '
<br /> E ;the locations of existing,wells as well,as proposed,locations of,,the two soil borings and one r
<br /> >. additional well (MW-4) ;f h :
<br /> t
<br /> SCOPE OF WORKS_
<br /> 4'ESE proposes.to;install two soil borings nriahe !.Vicinity`of soil boring B=2Y and one soil
<br /> boring;,to be-converted-.to'a'grounid;water�monitormg:.well;downgra dient of'B 2Y.;#The
<br /> j.
<br /> R-locations of the proposed;soil borings ands well ai a shown in`Figure 1_r. In addition;;ESE':-
<br /> proposes monitoring ground.water in th'e three existing .wells�(MW-1, MW 2, and MW-3)
<br /> i .as well as the:one:additional well (MW 4):.° Specific°tasks' associated::'with the proposed
<br /> scope of work pare as`follows 3 `. Y
<br /> _ Permitting/Preparation of'Health and Safety Plan
<br /> aR. ;ESE.will obtain clearance from underground ob_stru'ctions.thiougli':Underground Service '
<br /> �Y Alert (USA) and the.AT&T facility prior to.condiicting subsurface work:'ESE,:wnll prepare a>
<br /> Y a Health and-Safety`Plan.{HASP) prior to beginning work''at the site `This document wall.
<br /> Abe reviewed-by a Certified Industrial~Hygienist (CIH) The'HASP Will'' ehrieate generale
<br /> .and site specific safe-{work practices to be followed-by al1:ESE personnel,:subcontractors and . "
<br /> 1site.visitors .The:HASP will also is local and national emergency telephone numbers, and
<br /> willprovide a detailed :description and map of,the_routexo the nearest'hospital:'ESE will`'
<br /> ,. ,
<br /> t ;prepare.and submit:a workplan ,d'escribmg-proposed activntie`s to the"PHS/EHD prior to
<br /> initiation of field work
<br /> � Field'Investigation =`Install soil borings/ground water`nvnitoring=well
<br /> t 't _
<br /> After receiving the appropriate.permits and;clearance from under gi ound,`util'" ies, ESE will
<br /> T ; y direct ;the drilling of soil''borings and the'installation:of one ground water,`well at.:the'.L.' K
<br /> !proposed locations ' As requested byrvfhe PIIS/EHD, ESE will drill two soil:borings,in�the4 IL :
<br /> µ A
<br />
|