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.: <br /> }� <br /> 1 <br /> 10 March 1999 A. <br /> 9 <br /> =NC=Project No. 98 68 <br /> 04 ` _ <br /> _' xt <br /> - #'• .-P . <br /> :Page 2.of 3 <br /> _ �r j., L. t <br /> Approximately 2:5 gallons of'water was reffioved from MW-3' During b�ailuig actI' ties;a small <br /> z.quantity.of silt; Erie sand :andorganic matter werdremoved-from'the well The fine sand removed' <br /> -appeared - <br /> eared ta.be format material rather thah-well filter-pack material. ln.addition, a trace amount- <br /> - _ ofpea gravel was:rerrioved,fram the well. Following *1ing:detivitie-s_ -the water,level and`theIotal <br /> V depth of the well-were-measured at'6:48 feet{�btoc=and=26.35 feet btoc. Approximately l.S feet of silt <br /> r <br /> and fine sand material was removed fro rri the well.,.Basad•on'review of the well construction <br /> t diagram, well MW-J was reportedly installed to atotal'depth of approximately 30 feet below:ground . <br /> surface (bsg) <br /> Subsequently, AGE contacted the San Joaquin County=:Public Health Services 'Environmental <br /> Health.Division(PHS-EHD)to discuss thefiridings-of the well inspection activities.:Based on the <br /> discussion, the PHS=EHD.-tequired additional assessm'ent;activities'be conducted-to evaluate the-T <br /> productivity of the well The additional activities included purging well'MW-3 to evaluate w,e 1. <br /> recharge aril comparison of ground waterjfeld paramcter,heasurements (temperature;;pH, and <br /> F - -conductivity)rfrom:site monitonrig'wells MW-I"through MW-3. <br /> 17 <br /> On 04 March 1.990, monitoring wells MW'=l through MW 3 were each-purged of 10'gallons or <br /> approximately three well casing volumes of-ground water:During purging,activities, ground water, <br /> f'. '.-field parameters were measured and recorded on-Moritoring Well Field Logs-,(attached) As'shown <br /> of.the feld log`s;-`ground water field parameter measurements-were consistent-far each of the <br /> monitoring_wells. Additionally,-during-the purgingof:well MW 3, the water level-within the-well i <br /> 'decreased approximately 0.5 feet The well'appeared to-adequaWy produce,water: } <br /> y <br /> Conclusion and Recommendationsy <br /> - ter;" ti <br /> s The well vault for 'monitoring w&IFMW 3�is Beverly damaged and must be replace to prevent <br /> possib e am to the..�x Ply The cell ca�,ii�g ap�i�ared not to l,� damage znd in goad c:ondition ,. <br /> 51 <br /> 'Mont oririg well'aMW 3�_apparently contains approximately 3_5 fee'tsof{sediment:The°'sediment <br /> appears to consist offine=g ained silt.and saAd form a tion''material-that has infiltrated the filter:pack- 4 - <br /> "��: <br /> r and wellscreen'. Also, the-well appears to contain some pea gravel.material that 1ikely'enter the well . <br /> at the time the well vault -was.-damn- ed�-and- covered over. -Ground water.,field parameter <br /> = easurerh6htsfor-water coliected•from well MW-3 appear.consistent with measurements-from wells <br /> MW-.f.and,M.W.-2.-Additionally,'MW-3-appears to-sufficiently produce-water:for ground water_ = <br /> monitoring,purposes � ,; v <br /> til - <br /> Based on the findings of the"W6 .inspection and assessment;activities; monitoring well <br /> appears io be effective for the purposes of ground water sa"in Iing.and-monitoring. Thedarnage to <br /> the.well "I 'd does -not appear to have'effe�eted the structural integrity of the wellsanita_ry=seal. : <br /> However MW^3,was artiall , Unca ed for an undeteriniried'.duraton of time.allowin for:.the <br /> P_ _ y pp = <br /> Advaheed GcoEnvironmcntaf,Inc.- <br /> 7 <br /> nc- <br /> � . "'4' <br />