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, • '"'~ M. ~ARSONS LABORATORY ~AIITMINT 01' CIVIL I:NOINIDINO. 11LDca. ...415

MAMACHUMTTe INS'TITUK 01" TlrCHNOI.OCIY

CAMIIItiDO&, MAUACHUIII:TTS 02 I 31

H,tlr-HyruiiNu - COIIIul B•giNm.g H~rolo11 .N IF'Mlr R11orm• s,,,.,., Af'Mii& Sdftu 111M B•mu•"""""" B•gi~Nm.g

february 28, 1986

TO: J ...a aogera, Truatee John Ayrea, GZA David Webater, U.S. IPA • Jtt...,.vf

=~1/:::Ai p·J/ ~I 6 .J PIOM: Phil Gacbve6d \ l " ­

SUBJICT: leviaed Veraion of Deliverable 11 (Pbaae 1 s..pling Plan)

I have received thia doCUMnt and have briefly looked through it. The

following thoulhte/reactiona/co...nta aay be •helpful•:

1. It ia unclear to .. bow data collected by previoua workera, poaaibly without

correepooding control data on blanka, ataodard recoveriea, etc., ean ever

really be •validated•. the cbaaiata 880ngat ua probably recoJDi•• thia

li.ttation and will treat the data with appopriate auapicion, but 1 hope our

aon-analytieal chaaiat collequea alao will uint&in aOM dear•• of caution

when dewin& theae data even after GU (aDd UVI'f) have done ae •ch ae they

can to ·validate• it.

2. GZA aotea (p. 6) that the Mtala data are llkely ~roalaed by the inelaaion

of eoil uteriala to tbe ea.plu. Vbll tbb la eart&ialy true, tbue data

etill eene ae ~ boaDda at 1 ut eootribati to rallq oat aOM Mtala

for eoneera. rartber, Table S o tJ'Pleal aoll Mta.l eootent (particalarly

that froe tb u.s.c.s.) eaa poeetbly M ed 1D c-..J ettoo wit u appet

ltatt uti.Mte of uttflelall,J 1 rated eaepe elll lev le 1D p:oeodwter

1u (< 10 ...U) to ... U -.yo atntiooe nal.ly etaod

~ edd1t1oo to t t t tioo (p 8).

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4. Appendix A, Figure 3 ahowa an •interesting• near-aurface ground~ater flow

pattern and aakes •• wonder if a shallow •onitoring well between 1106 and proposed 1316 .tght be useful.

s. (p. 4) The current shallow groundwater flow pattern was noted to be in general

&~re...nt with that reported earlier by Perkin-Jordans. Does this •ean the

cap is not substantially di.tnishing recharge?

Theae iaeues are not raieed in anticipation of any changes in the existing

docu.ent, but rather to facilitate e•eryone's (including .tne) understanding of the a•ailable infor.ation.

(P.s. Sorry 1 cannot aake our .onthly ..eting as I'll be away••• just shows we

shouldn't echedule around •I)

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