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Chevron Products Company to FoRner Chevron Service Station 95775, 301 West Kettleman Lane, Lodi California March 30, 2000 • approximately 2,406 to 12,850 ft2/day, and 0 0023 to 0 1, respectively AgtesolveTM results are presented as Attachment B • Recovery Test In addition to analyzing drawdown data collected during pump test activities, analysis was also to be conducted on recovery data from observation wells using the Theis recovery method to provide an additional estimate of T However, the Theis recovery solution does not permit inputting data from more than one pumping well Since both wells were known to Influence aquifer data collected at the site and both the City of Lodi well and the onsite pumping well could not be accounted for in the recovery solution, recovery analysis was not performed SUMMARY A constant -rate aquifer pumping test was performed to estimate aquifer parameters including T and S for the aquifer Results of the parameter analysis for the constant -rate pumping test are summarized in Table 2 Background data for all the wells showed that the influence of pumping from Well 12 was observed in wells MW -1, MW -5A, MW -8B, and EX -3 The drawdown effects observed from pumping at Well 12 were 10, 0 4, 0 3, and 0 1 feet in wells MW -8B, MW -5A, EX -3, and MW -1, respectively No influence from the municipal well pumping was observed in wells MW -5B, MW -8A, and MW-14/EX-2 Changes in barometric pressure were observed to influence the water levels in the shallow screened wells (MW-IVEX-2, MW -1, and MW - 5A) No such influence of the barometric pressure was observed on water levels in the deeper screened wells (MW -5B and MW -8B) Aquifer parameter values determined from data collected from MW-14/EX-2 varied with respect to T values, ranging from approximately 2,406 R2/day to 12,850 R2/day Based on this, data from MW-14/EX-2 would be considered the least reliable of the three wells Comparison of analytical results of all three wells with and without accounting for Well 12 indicated that the municipal well is close enough that the effects of pumping have a substantial effect on the analytical solutions of the pump test This was to be expected since operation of the Well 12 is known to influence water levels at the site Based on this, operation of the Well 12 cannot be ignored when evaluating aquifer data collected at the site Aquifer parameter values determined from data collected from MW -1 that had been corrected for barometric influence and also accounted for operation of the City of Lodi well and aquifer parameter values determined from data collected from MW -5A that had accounted for operation of the City of Lodi well are considered to be the most representative of site aquifer conditions Based on this, the average T and S values that were determined from aquifer pump test activities are approximately 1,497 ft2/day and 0 1, respectively IChevron1957751Aquifer test\Pevised195775Aquifertestrevised doc