ARCHIVED REPORTS XR0009970 - Laserfiche WebLink

Home Browse Search

°!i fed Date December 4, 1998 ARCO QUARTERLY GROUNDWATER MONITORING REPORT Facility No 2130 Address 7906 EI Dorado Street, Stockton, California ARCO Environmental Engineer Paul Supple Consulting Co/Contact Person Pinnacle/Matt Turner Consultant Project No 20805-114 009 Primary Agency/Regulatory ID No Mike Infurna, San Joaquin County Public Health Services WORK PERFORMED THIS QUARTER (Third 1998) 1 Groundwater samples were collected from monitoring wells MW-1 through MW-7 and MW-10 and submitted for laboratory analysis 2 Pinnacle compiled and evaluated groundwater monitoring data 3 EMCON conducted routine operation and maintenance of the air bubbling system to increase dissolved oxygen (DO) levels in the wells at the site and, thereby, help to promote biodegradation of hydrocarbon-impacted groundwater i4 Pinnacle shut down the soil vapor extraction (SVE) system in the fourth quarter 1997 due to low influent soil vapor concentrations The system remained down this quarter due to low hydrocarbon concentrations in the influent soil vapor WORK PROPOSED FOR NEXT QUARTER (Fourth 1998) 1 Pinnacle will continue to perform routine quarterly groundwater monitoring on behalf of ARCO The next sampling event is tentatively scheduled for December 1998 Groundwater samples from wells MW-1 through MW-7 and MW-10 will be collected and analyzed for total petroleum hydrocarbons as gasoline (TPHG) using U S Environmental Protection Agency (USEPA) Method 8015, and for benzene, toluene, ethylbenzene, and total xylenes (BTEX), and methyl tert-butyl ether (MTBE) using USEPA Method 8020 2 The SVE system will be pulsed on a periodic basis (once per month, for one week, if warranted) 3 Pinnacle will continue to operate the air bubbling system to increase DO levels at the site The low flow system will continue to operate on a continuous basis • CP1D 1QMR13RDQTR--11213GQ398 DOC-98ft 1 p Rev 11/19/98