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1 <br /> d <br /> Date May 4, 2001 <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 Delta Environmental Consultants, Inc /Jay R Johnson <br /> Consultant Project No D000-330-1 <br /> Primary Agency/Regulatory ID No Margaret Lagono, San Joaquin County PHS/EHD <br /> WORK PERFORMED THIS QUARTER (First 2001) <br /> 1 Delta collected depth to water measurements in the monitoring wells and vapor extraction wells on <br /> a monthly basis <br /> 2 Groundwater samples were collected on March 16, 2001 and submitted for laboratory analysis <br /> from monitoring wells MW-1 through MW-4 and vapor extraction wells VW-113, VW-2B, and <br /> VW-3B <br /> 3 Delta compiled and evaluated the groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER (Second 2001) <br /> 1 Depth-to-water measurements will be collected from the monitoring and vapor extraction wells on <br /> a monthly basis <br /> 2 Delta will continue to perform quarterly groundwater monitoring The next sampling event is <br /> tentatively scheduled for June 2001 Groundwater samples from monitoring wells MW-1 through <br /> MW-4 and vapor extraction wells VW-1 B, VW-213 and VW-313 will be collected and analyzed for <br /> total petroleum hydrocarbons as gasoline (TPHG) using U S Environmental Protection Agency <br /> (USEPA) Method 8015 DHS LUFT and for benzene, toluene, ethylbenzene, and total xylenes <br /> (BTEX), tertiary butyl alcohol (TBA), methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), <br /> ethyl tertiary butyl ether (ETRE), and tertiary amyl methyl ether (TAME) using USEPA Method <br /> 8260 <br /> 3 Delta will implement the well installation activities outlined in the February 10, 2000 workplan <br /> prepared by the IT Corporation once access is granted by the City of Stockton <br /> Current Phase of Protect Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-4 and shallow vapor wells VW-1 <br /> through VW-3 W Quarter! <br /> Frequency of Groundwater Monitoring Monthly <br /> Sample Date March 16,2001 <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> C 1ARC0121861QTRLY12001\2186Q101 doc Delta <br /> 514101 <br />