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Project Ouartedy Update Report May 11, 1992 <br /> Southland, 9110 Thornton Road, Stockton, Caldomia 3 <br /> During this reporting period, the following groundwater monitoring wells could not be monitored on <br /> the specified dates because they were dry <br />' ■ Wells MW-2, MW-3, MW-4, MW-5, MW-9, MW-10 and PW-2 on January 30, 1992 <br /> I ■ Wells MW-2, MW-3, MWS, MW-5 and MW-10 on February 24, 1992. <br /> ■ Wells MW-2, MW-3, MW-4, MW-10, and PW-2 on March 30, 2992 <br /> Additionally, monitoring wells MW-6 and MW-12 are no longer in service and monitoring wells MW-11 <br /> and MW-14 were not monitored or sampled at Southland's direction; The well completion data and <br /> current status of the mondonng wells at the site are summanzed on Table 2 <br /> The regional groundwater-gradient direction remains to the east as previously reported�The <br /> gradient magnitude was approximately 0 002 feet-per-feet (ft/ft) for the three monitoring events on <br /> January 30, February 24, and March 30, 1992 Figures 4, 5, and 6 present the interpreted ' <br /> potentiometric surface using monitoring data collected on January 30, February 24, and March 30, <br /> 1992 <br /> During this reporting period, no petroleum odors or separate-phase hydrocarbons were detected in <br /> any of the monitoring wells or pumping wells <br /> 2.2 Groundwater Sampling and Analyses <br /> amplEng of the operational groundwater monitoring wells (i e, wNell w ich contained enough water <br /> to sampie)�was perform@¢twice during this reporting period} on February 24�and March 30, 1992 <br /> Laboratory analyses results of the February 24, 1992, es were suspect, due to anomalouga <br /> valuel, Ani alyses of confirmation samples collected on March 30,_1992, verified that benzene] <br /> I �o n eth benzene, xylenes (BTb , and total petroleum hydrocarbons (TPH)-as-gasolinq <br /> con t ations were below-detection limits, except for the sample collected from monitoring well <br /> The laboratory analytical result far TPH-as-gasoline was 19 parts_per bilhon_(pp b) m the <br /> sa Im a from well MW-1. Samples were collected according to Groundwater Technology's standard <br /> operating procedures (Appendix A) Groundwater sampling was conducted by first purging water <br />. from each well using a polyvinyl chloride (PVC) bailer Each well was purged of a minimum of four <br /> well volumes of water by hand bailing, unless the wells could be purged dry The groundwater was <br /> i GROUNDWA'T'ER <br /> TECHNOLOGY, INC <br /> Ii <br />