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l <br /> �YJ T <br /> Date May 30, 1996 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 02168 Address 441 Charter Way, Stockton, California _ <br /> ARCO Environmental Engineer Kyle Christie <br /> Consulting Co/Contact Person EMCONIJay R Johnson <br /> Consultant Project No 20805-146 007 <br /> Primary Agency/Regulatory ID No Mike Infurna, San Joaquin County Public Health Services <br /> WORKED PERFORMED THIS QUARTER (First- 1996) <br /> 1 EMCON performed quarterly groundwater sampling <br /> 2 EMCON compiled and evaluated groundwater monitoring data <br /> 3 EMCON observed the removal of the four underground storage tanks and associated product <br /> delivery lines <br /> WORKED PROPOSED FOR NEXT QUARTER (Second- 1996) <br /> 1 ARCO will continue to perform quarterly groundwater monitoring The next sampling event is <br /> tentatively scheduled for May 1996 Because wells MW-1 and MW-2, which were scheduled to be <br /> analyzed for halogenated volatile organic compounds (HVOC's), were inaccessible during the first <br /> quarter 1996, the wells will be analyzed for HVOC's during the second quarter EMCON will collect <br /> groundwater samples that will be analyzed for total petroleum hydrocarbons as gasoline (TPHG), and <br /> benzene, toluene, ethylbenzene, and total xylenes (BTEX) In addition, samples collected from wells <br /> MW-2 and MW-6 will be analyzed for total oil and grease (TOG) <br /> 2 EMCON will prepare a report summarizing the results and findings of the tank removal activities <br /> Current Phase of Protect Remediation <br /> Frequency of Groundwater Sampling Quarter) <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product (FP) Present On Site No <br /> FP Recovered this Quarter None <br /> Cumulative FP Recovered to Date None <br /> Approximate Depth to Groundwater 27 55 to 31 67 <br /> Groundwater Gradient Northeast <br /> 0 002 <br /> DISCUSSION (optional) <br /> Results of this monitoring event indicate that levels of dissolved gasoline hydrocarbons are consistent <br /> with levels detected during previous sampling events Groundwater gradient is consistent with previous <br /> sampling events Groundwater elevation increased approximately 2 77 feet from the previous sampling <br /> event (November 1995) <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitoring Data <br /> • Table 2 Results of Additional Analyses of Groundwater Samples <br /> • Figure 1 Site Location Map <br /> • Figure 2 Generalized Site Plan <br /> SACIN IPJ010805108051460 7AS-951dms 2 <br />