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R7CEIVED J A N 17 1992 GROUNDWATER ENVIRONMENTAL HEALTH ❑ INC. PERMIT/SERVICES❑❑ TECHNOLOGY, INC. 4057 Port Chicago Highway Concord CA 94520(45)6712 387 FAX (415)685 9148 January 14, 1992 Project No 023201497 Mr Steve Schneider San Joaquin County Public Heatth Services P O Box 2009 1601 East Hazelton Ave Stockton, CA 95201 RE Manna Pro Facility 4004 S EI Dorado Stockton, Caldomla Dear Mr Schneider Groundwater Technology, Inc, Is pleased to submit this Quarterly Groundwater Monitoring and Sampling Report for the quarter ending November 30, 1991 Groundwater monitoring and sampling, and preparation of this report was performed pursuant to Section 2652(d) of the Underground Storage Tank Regulations (California Code of Regulations, Tale 23, Subchapter 16), and as requested in the May 20, 1991 letter from Public Health Services (PHS)to Mr Dean Willis of O'Melveney and Myers In accordance with the May 20, 1991 letter, this report presents s Status of Site Investigation and Cleanup Activities i • Groundwater Monitoring Data • Groundwater Quality Data Status of Site Investigation and CleanuR Aptivitles Site investigation has been performed since discovery of the petroleum hydrocarbon contamination at the Manna Pro site to delineate the extent of the impact to sod and groundwater The impact appears to be the result of loss of product from five underground storage tanks and associated piping that were removed in June 1990 Soil resulting from a combination of removal of the tanks and further excavation of the pit to define the limits of the impacted soil has been stockpiled on the site pending evaluation of treatment options Currently the tank pit excavation remains open, and the excavated soil has been segregated into stockpiles of clean and impacted sod Although presently under evaluation, stockpiled soil will likely be addressed by sampling it further and backfilling the pit with that soil meeting certain agreed upon standards The remainder of the stockpiled soil not meeting those standards would then be treated via on-site uncontrolled aeration The extent of sod and groundwater impacts remaining have been evaluated in Soil and Groundwater Investioation at MannaPro, Inc, Facift dated December 1990, prepared by ERM-West, Inc Additional groundwater monitoring wells may be required to establish plume perimeter monitoring points In our letter to PHS dated August 28, 1991,the overall remedial strategy for in place sod and groundwater was outlined Sod treatment will likely involve in-situ sod venting Groundwater remediation will involve groundwater extraction to maintain hydraulic control of the plume Offices throughout the US Canada and Overseas