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• <br /> QUARTERLY REVIEW <br /> 4614 W Turner Rd . , Lodi <br /> Page 4 <br /> Groundwater samples were obtained from the 9 available wells <br /> Laboratory analyses indicate that benzene was present in MW-1 and <br /> MW--3 at concentrations of 260 ppb , and 0 7 ppb . , respectively <br /> TPHg was detected in MW-1 and MW-3 at concentrations of 1500 and 60 <br /> ppb , respectively Laboratory analyses are summarized in Table 2 <br /> SUMMARY ' <br /> Five quarters of groundwater monitoring and sampling at the <br /> Sebastiani Vineyards Woodbridge site is detailed in the above text <br /> Laboratory analyses of the water samples indicate that monitoring <br /> wells MW-1 and MW-3 contain BTEX and TPHg <br /> The data suggests that the source of BTEX and TPHg in wells MW-1 <br /> and MW-3 is related tc the unauthorized release of petroleum <br /> product from a previously removed underground storage tank The <br /> quantities of contaminants , though fluctuating , show a downward <br /> trend 1n concentration over the five quarter period (Table 3 ) <br /> Evidence suggests that the contaminant plume has stabilized in the <br /> area monitored by 14W-1 and MW-3 Although small amounts o; <br /> contaminants have been recorded in MW 10 ( 7/19/ 91 ) , MW-2 (TPHg <br /> only , 1/24/ 92 ) , and MW-7 (TPHg only , 1/ 21/ 92 ) , these have been <br /> isolated incidents fol1owea by clear. test-:ag ( Table 3 ) Se:astianL <br /> feels that RESNA ' s sampling process -nay have caused erroneous <br /> readings <br /> Sebastian, would like to continue quarterly sampling of MW-1 arc <br /> MW-3 only This would save Sebastiani between $1200 and $1500 each <br /> quarter , a considerable saving Sebastiani Would test MW-2 , MW-4 , <br /> MW-5 , MW-6 , MW-7 , MW-8 , and MW-10 annually <br /> In addition , at this time , Sesastaani is preparing to instal _ ar_c <br /> operate a groundwater extraction system to begin rened_atior_ of the <br /> dissolved phase hydrocarbon plume associated with the forme; <br /> underground tank A schedale far comp= et,on of znstal ? atlon a.- <br /> start up of the system is being final zea at this time <br /> I . ope this corresponcence :'teats your neeas _ can oe reachec a: <br /> ( 209 ) 339-131.1 with any quest;ons or ccm is you nay have :. e _a _ _,-- <br /> to this project <br /> Yours truly , <br /> SE ASTIANI VINEYARDS <br /> Pro ;ect Manager _ <br /> 3zta� nn= <br />