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QUARTERLY GROUNDWATER MONITORING AND SAMPLING REVIEW <br /> QUARTERLY GTS MONITORING 'IND SAMPLING REVIEW <br /> 4614 W TURNER RD LOD I <br /> PAGE 2 <br /> F of l owing the ini tia.i excavation 15 zez I borings .sere drilled , <br /> between Mav 15 and June 2 " 1989 Lanoratori results of soil <br /> analyses deterrminecz the presence or petroleum hydrocarbons in <br /> concentrations eviceeair.a 100 mg/ka in the area surrounding the <br /> tank excavation Atter comnlet?on 10 of the c7orir_as were <br /> convertea to groundwater monitcrina wells ( Figure 2 � Initial <br /> samviina of the wells indicate the o_ resence of benzene in <br /> concentrations above the DHS Ma_rimum Contaminant Levels ( MCL ' s ) <br /> for drinxina water in three of the wells <br /> In the fall of 1992 a aroundwater treatment system was installed <br /> in MW 1 A report on the installation of this system has been <br /> submitted to San 3oaauin Public Health Services and to Central <br /> Valley Recional Water Oualiti Control 3oard <br /> Groundwater and Groundwater Treatment 5'vSLe^ ' GTS ' Monitor'-nom and <br /> Samnl i na -and- _ _ _ _ _ -- -- __--- -- <br /> Results from earlier auarterly samplings nave oeen sunmittea in <br /> previous reports Tr_e auarteriv sampling covered in this revart <br /> was conducted by Caltest Anai -tical Lanoratcries The results of <br /> the findinas are summarized in the Lollowina sections <br /> Groundwater levels are presented , -i Table ! nnal vticai results <br /> are presented in Tanle 2 Copies or the iaoorarory reports are <br /> presented in Attachment T_ <br /> THIRD OUARTER 1994 - Sampled on -_5 ana Seutemoer 5 1994 <br /> Gr�Unawater levels were octa_neca rr,)iii monitoring wells #1 #3 , <br /> ana #5 Samples 4ere ontained rrcm monitoring ;cells #1 and #3 at <br /> the site Due to an error in samnlina monitorina well #1 nad to <br /> be resampled on Sept 6 Honi "or,ra Well # 1 has been converted <br /> into an e ,traction well HoweveL *re GTS was temporarily not <br /> operational so the ou:n: was removea _rom the wei l ana a same: e <br /> was taKen with a bailer MW- 9 was damages in 1990 ana cannot -be <br /> Sammi eci The rema n1 n,%, ie i ss iere nGr scncr.�ul ea to be samot ea <br /> inc <br /> durtnic round of�sampl i Tlc Tie i r• F i uent ana e f f 1 uani: t�c the <br /> 'QTSmere not sampled as the s-rscem was te*nperaril r nor- running <br /> Grouncgatel- levels at t_ne tnLee pojn,rc average 17, Oa Fact b.aJcw <br /> the sur--ace �Th.ic reocesent�; an averaae aro`D or 0 47 Poat rrJm <br /> the second guano!- T_ 1994 <br /> Lao 7 na i z*si s zncws =r-3c,2 am,) ,.n-i in <br /> c 1 D7D 5enwene `? oub Etna 1oen:en-- an.a 7 _ non 't"1ene no <br /> cietectable % � iuene ana c7 u�?r � ;= aC ! - '_ -- a. pe't.:o.- eum <br /> rilvarocarncns a5 +asoi in:'? ( T Fa l I 4w- � _ a!) ana! vsiz Snows <br /> 120 0 cob TPHa ana no aet ectaol e amounts or ar_V other <br /> contaminants <br />