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I I E ' Project Quarterly Update Report July 30, 1991 9110 Thornton Road, Stockton, California Page 6 According to National Weather Service local climatological data for the Stockton area, below- normal annual precipitation has been recorded for the past five years However, in 1982 and 1983, prior to the drought period, annual precipitation was almost twice normal Therefore, the ' magnitude of the decline in the groundwater-table elevation may be in response to the prolonged drought conditions occurring after an abnormally-elevated groundwater level at the beginning of the ' monitoring period During this reporting period, the following groundwater-monitoring wells could not be monitored on ' the specified dates as the decline in water level has caused them to go dry • Wells MW-3, MW-4, MW-5 and MW-10 on April 29, 1991 ' Wells MW-2, MW-3, MW-4, MW-5, MW-10 and PW-2 on May 27, 1991 • Wells MW-3, MW-4, MW-5, MW-10 and PW-2 on June 24,1991 ' Wells MW-1, MW-8 and MW-9 had sufficient water to be detected for monitoring of water levels, however, the total volume was insufficient for sample collection purposes on May 22 (i e , the wells either went dry after purging or did not recharge with sufficient water to allow for sample collection) Additionally, monitoring wells MW-6 and MW-12 are no longer in service and ' monitoring wells MW-11 and MW-14 were not monitored or sampled at Southland's direction The well completion data and current status of the monitoring wells at the site are summarized on ' Table 1 ' The Poteniometric Surface Maps for April, May and June 1991 (Figures 4, 5 and 6) represent the interpreted groundwater-table elevations beneath the site for each of the last three months of this I reporting period The regional groundwater-gradient direction remains to the east as previously reported The gradient magnitude was found to be approximately 0 002 foot-per-foot (ft/ft) for April, May and June respectively During this reporting period, no petroleum product odors or separate-phase hydrocarbons were ' found in any of the monitoring wells or pumping wells -1 1011 GROUNDWATER 171-1 TECHNOLOGY, INC I