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EggQ <br /> IMI- N <br /> € - .•, '� _ <br /> -d-a9- 1,M- - <br /> -r <br /> E <br /> f <br /> == = JAN 1 7 1992 <br /> GROUNDWATER ENVIRONMENTAL H£ALT14 <br /> PERMIT/SERVICES <br /> �— -- <br /> TECHNOLOGY, INC. <br /> 4057 Port Chicago lti}!„ejy,C.ntunl.CA!i-SaSUt4Lil,iil 3317 <br /> January 14, 1992 FAX:0151 <br /> Project No.023201497 <br /> Mr.Steve Schneider <br /> San Joaquin County Publ!c Health Services <br /> P.O.Box 2009 <br /> 1601 East Hazelton Ave. <br /> Stockton,CA 9520 i <br /> RE: Manna Pro Facility <br /> 4004 S.El Dorado <br /> Stockton,California <br /> Dear Mr.Schneider: <br /> Groundwater Technology,Inc.,Is pleased to submit this Quarterly Groundwater Monitoring and Sampling <br /> Report for the quarter ending November 30.1991. Groundwater monitoring and sampling,and preparation <br /> of this report was performed pursuant to Section 2652(d) of the Underground Storage Tank Regutatlons <br /> (Cal)fomla Cods of Regulations,Me 23,Subchapter 16),and as requested in the May 20,1991 letter from <br /> Public Health Services(PHS)to Mr.Dean Willis of O'Mehreney and Myers. In accordance with the May 2o, <br /> 1991 letter,this report presents: <br /> • Status of Site investigation and Cleanup Activities <br /> • Groundwater Monitoring Data <br /> • Groundwater Quality Data <br /> %atusOf SROA gatiQrland Cleanup Activitfes <br /> Site Investigation has been performed since discovery of the petroleum hydrocarbon contamination at the <br /> Manta Pro site to delineate the extent of the impact to soil and groundwater. The Impact appears to be the <br /> result of foss of product from five underground storage tanks and associated piping that were removed in <br /> June 1990. Soil resulting from a combination of removal of the tanksand further excavation of the pit to <br /> define the Iim€ts of the Impacted soil has been stockpiled on the site pending evaluation of treatment options. <br /> Currently the tank pit excavation remains open,and the excavated soil has been segregated into stockpiles <br /> of clean and impacted soil. Although presently under evaluation,stockpiled soil will likely be addressed by <br /> sampling it further and backfill€ng the pit with that soil meeting certain agreed upon standards. The <br /> remainder of the stockpiled soil not meeting those standards would then be treated via on-site uncontrolled <br /> aeration. <br /> The extent of soil and groundwater impacts remaining have been evaluated in Soil and Groundulgr <br /> 1pft_M Manna Pro. Inc. Facift dated December 1990, prepared by ERM-West, Inc.. Additional <br /> groundwater monitoring wells may be required to establish plume perimeter monitoring points. In our letter k <br /> to PHS dated August 28; 1991,the overall remedial strategy for in place soli and groundwater was outlined. <br /> Soil treatment will ilkely Involve €n-situ soil venting. Groundwater remediation will involve groundwater <br /> extraction to maintain hydraulic control of the plume. <br /> pf!"rr i•,c Jltr+urUhntt!!!t.•l a„('rrn�dre mrd l Jrirs�'ers <br />