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Date October 9, 1998 <br /> ARCO QUARTERLY STATUS REPORT <br /> Facility No 02168 Address 441 Charter Way, Stockton, California <br /> ARCO Environmental Engineer __Kyle Christie <br /> Consulting Co/Contact Person Pinnacle/Jay Johnson <br /> Consultant Project No 20805-146 011 <br /> Primary Agency/Regulatory ID No Ron Rowe, San Joaquin Coun Public Health Services <br /> WORK PERFORMED THIS QUARTER (Second 1998). <br /> 1 Groundwater samples were collected from monitoring wells MW-1 through MW-7 and submitted for <br /> laboratory analysis <br /> 2 Notified San Joaquin County Public Health Services (SJCPHS) in a letter dated April 8, 1998, that the <br /> SVE system will be shut down because soil vapor concentrations influent to the system did not <br /> • rebound after a 3-week shutdown Benzene levels in influent soil vapor continued to decline to non- <br /> detectable levels <br /> WORK PROPOSED FOR NEXT QUARTER (Third 1998) <br /> 1 EMCON will continue to perform quarterly groundwater monitoring for ARCO The next sampling <br /> event is tentatively scheduled for August 1998 Groundwater samples will be collected and analyzed <br /> for total petroleum hydrocarbons as gasoline (TPHG) using U S Environmental Protection Agency <br /> (USEPA) Method 8015, and for benzene, toluene, ethylbenzene, and total xylenes (BTEX) and methyl <br /> tert-butyl ether (MTBE) using USEPA Method 8020 <br /> Current Phase of Project Remediation <br /> Frequency of Groundwater Sampling MW-1 through MW-7= Quarters <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sample Date May 22, 1998 <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 18 14 to 22 21 <br /> Direction of Groundwater Flow Northeast to Southeast <br /> ( Groundwater Gradient 0 0026 to 0 oo3 <br /> SALIN%P70I0805I08051461 IBS-981cbeli 1 1 <br /> Rev 0, 10/22/98 <br />