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Date January 5, 2000 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No: 02186 Address: 3212 North California Street, Stockton, California <br /> ARCO Environmental Engineer: Paul Supple <br /> Consulting Co./Contact Person: Pinnacle/Joel Coffman <br /> Consultant Project No: 791699.01000000 <br /> Primary Agency/Regulatory ID No: Carol Oz, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Third 1999): <br /> 1. Groundwater samples were collected and submitted for laboratory analysis from monitoring wells <br /> MW-1 through MW-4 and vapor well VW-3. Analysis included oxygenates by USEPA Method 8260. <br /> 2. Pinnacle compiled and evaluated the groundwater monitoring data. <br /> 3. Submitted UST Replacement Report dated August 12, 1999. <br /> 4. Conducted soil and groundwater assessment to further evaluate vertical and lateral extent of soil and <br /> groundwater impacts during August 1999. <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 1999): <br /> 1. Pinnacle will continue to perform quarterly groundwater monitoring. The next sampling event is <br /> tentatively scheduled for December 1999. Groundwater samples from wells MW-1 through MW-4 and <br /> vapor well VW-3 will be collected and analyzed for total petroleum hydrocarbons as gasoline (TPHG) <br /> using U.S. Environmental Protection Agency (USEPA) Method 8015 Modified;for benzene,toluene, <br /> ethylbenzene, and total xylenes (BTEX), and methyl tert-butyl ether (MTBE) using USEPA <br /> Method 8020; and for oxygenates tertiary butanol, MTBE, di-isopropyl ether, ethyl tertiary butyl ether, <br /> and tertiary amyl methyl ether using USEPA Method 8260. <br /> 2. Submit assessment report. <br /> Current Phase of Project: Monitoring <br /> Frequency of Groundwater Sampling: MW-1 through MW-4, and VW-3 = Quarterly <br /> Frequency of Groundwater Monitoring: Quarterly <br /> Sample Date: September 10, 1999 <br /> Is Free Product (FP) Present on Site: No <br /> FP Recovered this Quarter: NA <br /> Cumulative FP Recovered to Date: NA <br /> Approximate Depth to Groundwater: 37.72 to 39.37 <br /> Direction of Groundwater Flow: East-northeast <br /> Groundwater Gradient: 0.004 <br /> Impacted Soil Removed: Approx 1000 yd3 _. <br /> (ie - <br /> CP1C:\Archi ve\Arco121861Qtrly12186Q399.DOC-95Vsg:1 <br />