Laserfiche WebLink
Date January 28, 2002 <br />• ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 02186 Address 3212 North California Street, Stockton, California <br /> ARCO Environmental Engineer Pau[ Supple <br /> Consulting Co/Contact Person Delta Environmental Consultants, Inc 1 Jay R Johnson <br /> Consultant Protect No D000-330-1 <br /> Primary Agencyl Regulatory 1D No Samuel Savl , San Joaquin Count PHS/EHD <br /> WORK PERFORMED THIS QUARTER (Fourth 2001) <br /> 1 Delta collected monthly depth to water measurements in the monitoring wells and vapor extraction <br /> wells <br /> 2 Groundwater samples were collected from monitoring wells MW-1 through MW-7 and vapor <br /> extraction wells VW-113, VW-213, and VW-313 on December 11, 2001 and submitted for laboratory <br /> analysis <br /> 3 Delta compiled and evaluated the groundwater monitoring data <br /> 4 Delta submitted a report titled Groundwater Assessment Report (dated December 20, 2001) <br /> documenting installation of offsite wells MW-5, MW-6, and MW-7 <br /> WORK PROPOSED FOR NEXT QUARTER(First 2002) <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 March 2002 Groundwater samples from monitoring wells MW-1 through <br /> MW-7 and vapor extraction wells VW-1 B, VW-213 and VW-3B will be collected and analyzed for <br /> total petroleum hydrocarbons as gasoline (TPHG), benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX) using USEPA Method 8015/8020 DHS LUFT, and for tertiary butyl alcohol (TBA), <br /> methyl tertiary butyl ether, (MTBE), di-isopropyl ether (DIPS), ethyl tertiary butyl ether (ETBE), <br /> tertiary amyl methyl ether (TAME), and 1,2-dichloroethane (1,2-DCA) using USEPA Method <br /> 8260E <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-7 and shallow vapor wells VW-1 B <br /> through VW-3B =Quarter) <br /> Frequency of Groundwater Monitoring Month) <br /> Sample Date December 11, 2001 <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 41 80 to 44 00 feet bgs (December 11, 2001) <br /> Direction of Groundwater Flow Northeast <br /> Groundwater Gradient 0 0034 ft/ft <br /> P VARC0121861QTRLY1200I\Arco_2186_4QOI doe Delta <br />