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Date February 22, 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:__I_T_Cororation/Steve_Lofholm - - -. --- -.-. - - - --.- <br /> Consultant Project No: 791699 <br /> Primary Agency%Regulatary ID No: Carol Oz, San Joaquin Coun Public Health Services <br /> WORK PERFORMED THIS QUARTER (Fourth 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. IT compiled and evaluated the groundwater monitoring data. <br /> 3. Submitted October 19, 1999 report entitled Additional Assessment of Hydrocarbon Impacted Soil and <br /> Groundwater. <br /> WORK PROPOSED FOR NEXT QUARTER (First 2000): <br /> 1, IT will continue to perform quarterly groundwater monitoring. The next sampling event is tentatively <br /> scheduled for March 2000. Groundwater samples from wells MW-1 through MW-4 and vapor well VW- <br /> 3 will be collected and analyzed for total petroleum hydrocarbons as gasoline (TPHG) using U.S. <br /> 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 workplan for additional site assessment and feasibility testing. <br /> Current Phase of Project: Monitoring <br /> Frequency of Groundwater Sampling: MW-1 throw h MW-4, and VW-3= Quarterly <br /> Frequency of Groundwater Monitoring: Quarterly <br /> Sample Date: December 3 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: 37.64 to 39.33 <br /> Direction of Groundwater Flow: East <br /> Groundwater Gradient: 0.003 ft/ft <br /> CP:\N,�CamPk\Data\Archive\Ar6a\21861Qtrly12186Q499.DOC•98\Lsg:1 IT Corporation <br /> 02/22/00 <br />