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• <br /> QUARTERLY REVIEW <br /> 4614 W . Turner Rd , Lodi <br /> Page 3 <br /> Groundwater samples were obtained from 5 monitoring wells , MW-1 , <br /> MW-3 , MW-6 , MW--7 , and MW-8 Monitoring wells MW-4 and MW-5 were <br /> excluded from the sampling event at the request of Sebastiani <br /> Vineyards , based on the lack of hydrocarbon constituents during <br /> previous sampling events . Monitoring well MW-10 was excluded from <br /> the sampling because Sebastiani Vineyards was reviewing other <br /> testing options <br /> Laboratory Analyses indicated that benzene was present in MW-1 and <br /> MW-3 at concentrations of 250 ppb . , and 8 . 1 ppb. , respectively <br /> Total petroleum hydrocarbons as gasoline were detected in MW-1 and <br /> MW-3 at concentrations of 2 , 300 ppb , and 370 ppb , respectively . <br /> Laboratory analyses are summarized in Table 2 <br /> 1/ 24/ 92 <br /> Groundwater levels were obtained by RESNA from 8 monitoring wells <br /> at the s.te MW-9 remained inaccessiole MW-10 was sampled <br /> independently by CalTest Labs Groundwater information is <br /> summarized in Table 1 RESNA dia not provide Sebastiani with a <br /> gradient map for this sampling event <br /> Groundwater samples were obtained from 8 monitoring wells by RESNA <br /> Laboratory analyses indicate that benzene was present in MW-1 at a <br /> concentration of 20 ppb Total petroleum hydrocarbons as gasoline <br /> were detected in MW-1 , MW-2 , and MW-7 at concentrations of 620 <br /> ppb , 70 ppb , and 100 ppb , respectively <br /> CalTest labs did an independent sampling of MW-10 on February 21 , <br /> 1992 No contaminants were detected j-n MW-10 Laboratory analyses <br /> from RESNA and CalTest are summarized in Table 2 <br /> Once again , Sebastiani felt that RESNA was responsible for an <br /> erroneous reading on contaminants , this time in MW-2 and MW-7 , <br /> newther of which had ever shown any previous sign of contamination <br /> In addition , no contaminants were detected in MW-3 , which lies in <br /> the path between MW-7 and the tank site We were particularly <br /> concerned that carelessness may nave resulted in cross <br /> contamination of the samples RESNA again proved to be very slow <br /> to respond to our concerns <br /> 5/?/ 92 <br /> Groundwater levels were obtained from 9 monitoring wells by CalTest <br /> Labs Mw-9 remained inaccess-bl -aa Grou^dwater :nfozmatzon -, s <br /> s—=mar= =ea in Table 1 A gracient. Tmap was mc. , crecarea by :a!Tes : <br /> Labs <br />