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N1 J , � c........ I E ® GROUNDWATER ❑ ❑ TECHNOLOGY, INC. 4057 Port Chicago Highway,Concord CA 94520(415)671-2387 April 15, 1992 FAX (415)685 9148 Project No 023201497 Mr Steve Schneider San Joaquin County Public Health Services P O Box 2009 1601 East Hazelton Ave Stockton, CA 95201 RE Manna Pro Facility 4004 S EI Dorado Stockton, California Dear Mr Schneider Groundwater Technology, Inc , is pleased to submit this Quarterly Groundwater Monitoring and Sampling Report for the quarter ending February 29, 1992 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, Title 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 • Status of Site Investigation and Cleanup Activities + Groundwater Monitoring Data • Groundwater Quality Data Status of Site Investigation and Cleanup Activities Since the discovery of the petroleum hydrocarbon contamination at the Manna Pro site, a site investigation has been performed to delineate the extent of the impact to soil and groundwater The impact apparrently is the result of loss of product from five underground storage tanks and associated piping that were removed in June 1990 Soil from the 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 sod has been segregated into stockpiles of clean and impacted soil Although presently under evaluation, stockpiled soil will likely be addressed by sampling it further and backfilling the pit with soil that meets certain agreed upon standards The remainder of the stockpiled sod not meeting those standards will then be treated via on-site uncontrolled aeration The extent of petroleum hydrocarbons in the soil and groundwater has been evaluated in Soil and Groundwater Investigation at Manna Pro,.Inc Facility, 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 soil and groundwater was outlined Soil treatment will likely involve in-situ soil venting Groundwater remediation will involve groundwater extraction to maintain hydraulic control of the plume Offices throughout the US Canada and Overseas