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-� Il Jswul 0,0W.W......... <br /> nq lepoel <br /> ' 1l9rs xlpnuey pa.p <br />- Lxpe fora,[d lfornl. <br /> Pre]ec[Yo.10-Po-104 <br /> p 041 <br /> ' u d t ,lYtlaal ReanlP.. <br /> Ground W'Lun Rr sample. oellanted On September 22,S490 were anal d <br /> hTgNB and nd TPH. The Is bar.tory ..alta (attached) Sndica to that <br /> cfoonc <br /> h <br /> wh <br /> Resulie p;TPH Marc t detgcted in arty of the '*"ItOring wells. <br /> that TP;i anTR%cCartcentraLl¢n8rhavep been dee fining seines cthe <br /> 1nStiel sampling ¢gent !ry Tune, 1487, aenaene hoe hletI .. tly <br /> been the petroleum cenetltuent detected at the highest <br /> benzene oertcantratione at monitoring wells plotted a h;n tteamrlcaI <br /> dates. These Figures illustrate the dramatic decline in hen:ane <br /> aoncsntratiene in Thitoring walls at..the site. .petroleum <br /> constituents have not been date.ted at monitoring wells MW-1, HW- <br /> 3, and HW-4-fnr a periad Sn a..B.of one year, <br /> I liBNnATIBNn <br /> NCA recommends that all monitoring Wells .t the alta be thsampled <br /> am <br /> adl4 in approximatelteavlts of e nex <br /> t -� <br /> a piing stout intlleatey sIN menthe, Should no detectible oncentratiena of petreleum f <br /> canetituenta 1n ground water at the cite, we Wtll recommend that <br /> this site be officially cloaad and that no additional sampling of 1 <br /> ground water be performed. -. <br /> i ecRRhnLR - - <br /> iThe next bi-annual sampling avant is for thied for late March, <br /> ec91. The bl-annual menitoor=hg report for this sampling a ant le <br /> hedulgd Por submittal on R)—t April 20, 1991, <br /> E$ A�Rgf RImNAT BR Rn <br /> The recommendations cantained to this r¢port represent <br /> ptofeesional opinions. Ti19ee opiniena are bated on currently <br /> CV=ilable infernation and developed in ecco1 ce w1 th <br /> xently accepted geologic and hydregealoglc praetic¢s at this <br /> time and location, other than this, no warranty Ss implied o <br /> intended, r <br /> M"AT'I'•OpNge-OROONONATAR ARBCCIATRB <br /> ;^ <br /> p'6r=6I1 dons, R.G. <br /> Prinalpal Hydr.q.n2.glst - <br /> California Registered Geologist 14712 <br /> nl.N:dn <br /> - Pnelosures- - <br /> Co.Mr. Bob phlllipa - <br /> 010i1�r .. <br />