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- 7. <br /> . A-c�va f <br /> s - s <br /> GeoEn `v roamental hnc�:� # �= �:=. ,�• � � <br /> 11.January2005 <br /> AGE-NC Project.N01 0$87 r • - on F <br /> U 111 t <br /> -Mr.Nuel Henderson, J� _ - � =' <br /> l-- .. ' _ = :`. `` r 'EN1111 ON�vlr`43 HEALTH <br /> r : Sari Joaquin County Environmental Health Department r , <br /> Tj 304 East Weber Aoor <br /> FirRMiTf <br /> venue Third FlSE CES <br /> r. Stockton, California 95202MD <br /> C <br /> r'_ <br /> ' Subject: _ Additional Site Assessment Work Plan Addendum_ f aE - <br /> ;_ :SARALE FARMS JAS <br /> 165_00 Clifton Court Road, Stockton,~California zL `� , �-;- ��� <br /> rMEN HEALTH <br /> 7. <br /> ` .; r 4 E 'PfiMIT/SER111�ES <br /> r —r �• <br /> - Dear Mr:.Hendersan: - <br /> - <br /> Afyourrequest,Advanced Geo Environmental,Inc (AGE)has:prepared the enelosedAdditional Site.. r <br /> -.' . ; <br /> Assessment'Work Plan.Addendum;for the-site..located at .16500 Clifton Court'Road :iii'Stockton; <br /> California:The work plan ineltides;tlie""advancement of five palled cone penetroarieter testing <br /> soil borings for the collection-of soil:and ground water samples to complete the'lateral=and vertical <br /> delineation 'of petroIeurn`aiydrocarbon-impacted. ground water,-and,.-,to model-_the' geo3ogic and ... _ <br /> _ - hydrogeologic•fra neworkbeneath t-he site.The location ofthe site ands rounding area is illustrated <br /> - :- on Figure-l;.structures, former underground storage tanlc_(UST).l'ocations, and so lYboring anti ' <br /> j: monitoring well.-locations are illustrated on Figure 2 <br /> BACKGROUND y, <br /> ;�. Four groundwater monitoring wells(N1W-1#hrough MViW-4)'are currently Iocated at the-site.Ground° _ <br /> water occurred at depth of.approXimately 5 .5 feet below..surface=grade (bsg)'and,flowed-east <br /> northeast during ahe Novernlier 2004 quarte'rlymoriitoring event;:thiee of sever'monitoring events" <br /> to date have indicated an east=northeast ground water flow-di"ection;,however,;flow direction has;, - ~ <br /> .also occurred to_the soutlhwest and.,southeaifin pastmonitoring:events "={ <br /> la, <br /> "'- Total petroleum hydrocarbons quaritifzed as gasoline(TPH g)were detected at concentrations as high <br /> ' as 10,000,micrograms'per:liter (µgLl, MW-1)_in water sartiples collected frorrrtlie wells.during the. = <br /> Fs <br /> = initial quarterly-monitoring-event,in June 20-03'; ihe-highest concentration of iiiethyl tertiary-butyl <br /> ether(MTBE), 670µg/1,was also detected rn a sample from weILMW-'1 during the last monitoring <br /> ' event.in'November2004..S.gnafic 't coricentrafions ofbenzeiie;toluene,ethylbenzene;�and xylenes . ' r' - <br /> s; (BTEX) have -been' consistently detected .in monitoring wells -MW=1� through MW 3;' `. <br /> 1;2-dichloroethane (1,2 DCA) has been corisistently'd"etected in.wells.,MW-1 _MW-3,.and IVIW-4,•" - , <br /> _., 837 Shaw Road:Stockton California 95215- i <br /> ` _Telcpk-6—(209)`46-7=1006 .00C 09)`.467-11-18 <br /> . r. �- .. .r » - -. - -_ - � •� �`...� r .-. =�� - '� ate-- _ - 7 <br />