SITE INFORMATION AND CORRESPONDENCE

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25S3o I5; Feb•24-00 4:07Pt(; Page 314 W.Mn"ani L.Darbonio Page 2 24 February 2000 ia: 10 Cleanup goals proposed for groundwater Ave the Water Quality Qbjectives for nitrate and "i�,and is tnp,li amIIl0nI6, However,there is as published taste and odor threshold oconammonia f of 0.5 mgfI,sn this should be used instead. As I have disctused previously, the Primary cleanup goal wilt be the bavkgrcuud concentration for nitrate and ammonia, Side-gradient weds show uitratc as low as ane rngll and amnion a not dt:tec tom, If Koppel demonstrates that the background co cannot be met,then the water quality goal becomes the cleanup goad_ ncentration The RAP ProPo to obtain soil samples in, and at five year intervals. Eight subsampies will be propocomposited into one sample at each of three depots for each of tour separate planting areas. CH2M Hilt ses to analyze each composite sample for nitrate,ammonia and pH.Soil analyses should include otal Kjeldahl nitrogen{'I'If N). The RAP proposes to reduce mordtorin well sem tin t+fr.Vogt during our 23 FebruaryZ t; P g fiction,I it saveannually. As I di(wussed with 199 telephone conversation,atioq I will review this request in 6eparate vonrspondcnee when 1 review do 1499 Annual Report. The RAP also requested eliminating the groundwater monitoring requucment forTTGAf analyses and total dissolved solids(TpS). As the RAP notes,the monitoring rccctd shows that KN identified d site wasists of ammonia,not ozganicnitrogen,and the IDS information can be irrferiod from tho electrical conductivity data that's regularly collected during monitoring events. In our 23 February even excluding Mr.Vogt and d that he would proceed as usual with the first civartcr monitoring event,excluding the Second q and TITS a. -Wes, and we will both work to implement any changes to the seheduIc for the second quarter event. he The:RAP proposes fit at ye evaluation 10 to occur it year all=following initialplantigg,with ttubsequent evaluations g year 5,year 10 and year 1 S. analyze the impact that the h Y At the fust throe-year evaluation,CH2M Hill wil l evaluations will also include the impact on oil constituents.on has had on water quality,and the fjye year In order to insan rho initial activities into the record,Please submit a brief letter report he r completion of initial activities. This should include a table of soil sampling results,dates of plantingstuzurrarizing s variety of trees,any deviations from the work plan.and any other details that should be in the record. CH2M Hill originally submitted this RAP as a I?raft. Hawevcras no other changes are necessary to convert this document to a fwal,Mr. Vogt provided a replaccsa;of cover Remedial Action Plan into a Final Remedial Action plan pogo that changes the Drag 'Me Remedial Action plan is approved subjw to too following conditions: 1• The nd arary goaib shallgroundwater cleanup goals shall be one mgtf nitrate and non-detectable ammonia. The as nitrogen.g sal a water quality goals of 10 mS4 nitrate as nitrogen,and 06 ml;A ammonia 2. Solt analyses shall include T1QJ in addition to nitrate,ammonia, and pH. According the schedule in the RAP,CHZM Hill will sample soils on approximately S tvl:uch weather Permitting, A short letterre port smnmerizing the planting activities shall be duo concurrently With the second quarterly tnonitotingreportwhich is due 30 Jaly 20410. The subsequent evaluations maybe combined with Ura Annual Monitoring Reports. The third year evaluation will he elite 30 Jannary 2004, the fifth year evaluation will be due 30 January 2006,the tcn_year evaluation will be due 30 January