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1f1 eP� <br /> l� <br /> . Date September 9, 1999 <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 <br /> Primary Agency/Regulatory ID No: Carol Oz: San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Second 1999): <br /> 1. Groundwater samples were collected and submitted for laboratory analysis from monitoring wells MW-1 <br /> 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 /> WORK PROPOSED FOR NEXT QUARTER (Third 1999): <br /> 1. Pinnacle will continue to perform quarterly groundwater monitoring. The next sampling event is <br /> tentatively scheduled for September 1999. Groundwater samples from wells MWA 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. Conduct soil and groundwater assessment to further evaluate vertical and lateral extent of soil and <br /> groundwater impacts. <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: Quarters <br /> Sample Date: June 11, 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: 33.47 to 35.14 <br /> Direction of Groundwater Flow: East-northeast <br /> Groundwater Gradient: 0.002 <br /> CP\C:\Archive\Arco\2186\Qtrl y\2186Q299.DOC-95\lsg:l �[.11 Yl Lt C l2i <br />