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r - y t y I I- ; 1 5`• 4 rN i '' i '� - t,-r 3 •fir iy <br /> I • 'z r t h -a-! I a <br /> c' <br /> r l,._ <br /> Quarters Report = December 1991 , <br /> yJ . UIS-CLEANERS <br /> f HESS-DuB <br /> f <br /> h <br /> _ S <br /> 34S West Hat-ding Way L <br /> Stockton,Califaxnla r <br /> . i ,r 'r. 41 • r •5t 1 <br /> 1.0.5 - INTRODUCTION Ah' SCOPEOF..WORK' r <br /> vironmental, <br /> ` ro erty owner;Advanced G iOE" <br /> In accordance with the request of.Mr peter•Wallace,p p - <br /> Y' <br /> ' Inc. (AGE)has prepared this,Quarterly°Report`.de,tailing field activities at ;fig West Hardiz�g'Way, <br /> Stockton, California (the site)'.The scopeofwork�:was to monitoncurrentground water•conditions i <br /> at the site. The site loca'tion-and siirrouindings are illustrated in F�giare 1 =Location Map. Structures <br /> , r <br /> and monitoring well locations are,show in•Figure,2 =Site }'Idn x <br /> _ <br /> J <br /> Field'acttvities.af the site were performed^in.accordance with guidelines far investigation of;under <br />' ST. sites established by the-San-'Joaquin County Public Healtli S"ervices - <br /> gzound storage-tank {U } • <br /> Envir`onrnental Healtli Division(PHS-EHD)and the Central Valley Regional Water Quality Control. <br />' Board (CVRVv'QCB}.'' ` <br /> 2.0. PROCEDURES <br /> 2.1. MONITORING WELUPURGE,PROCEDURES <br /> urid <br /> Un'31'December'1997-, a.Soiinst water;level meter was used fa'measure the depvh on ° each well <br /> X11 <br /> in each well relative to the tops of the well casings. The relative:ground ater ele a <br /> ` <br /> and h draulic gradient,were determined from'these data:: <br /> a y, g <br /> er Qround water depths.v�ere measured;a-pie-cleaned,fwd-stageZ submersible,.pump was u seater, <br /> �' ' A rox�mately :10 gallons of <br /> purge-wells MW_J.; -MW­2, MW-'R,. K- - P <br /> and MW- : pp r <br /> minimum of three well volumes)were removed from each'well: Temperature, pH ad Stored inv55•- <br /> �vere nneasuzed at 2-gallon inter�ra]s using'an ICM-water analyzer. Purged water. . <br /> ballon DOT-appro.red.drures,on-site..ivionitoring well stabilization data and-field data sheets are ; <br /> Ir1cluded in Appendix A. x _ <br /> 2:2..:. COLLECTION OF GROUND-WATER SAMPLES z <br /> sable'bailers. Immedtatel_ . <br /> Ground water samples.were collected from each.wellsiiig�new"dispo _ <br /> u on retrieval,the samples•«,ere,iransferred into;40-ml:EPA-approved OA` ia�s G°erelira s�'ort d ' <br /> P.- P. <br /> =; le• reservative, and were labeled:..The samples <br /> of•18%lhydrochlori•c'acid'as a samp P MA-1 �n•Pacbeco, <br /> in a cliille°d container under chain-of-custody to McCampbell Analyu tified a"s Stoddard solvents', ; <br /> California. Satngles•were analyzed',for total petroleum h}drocar4�ons.q <br /> (TPH=ss); volatile aromatics.;{benzene;'toluene, ethylbenzene and`total xylenes: BTE&X) and, <br /> - fAdrrced CcoEnr•iron <br /> mntentat;Snc <br />