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Ms.Margaret Lagorio Mr Ronald Rowe Table 1,Page 2 June 18, 1998 Table 1-Status of Del Monte Food's Responses to October 14,1997 PHS/EHD Letter Re:Disco Property Page/ Requirement/Recommendation Response Paragraph/ Sentence 2/2/10- 12 Well screen intervals shall not exceed 20' in total length.Well screen and DTSC guidance for installing monitoring wells is specified in the workplan filter pack construction shall not act as vertical or horizontal contaminant addendum. 1 transport mechanism.Preferably,monitor well screened intervals shall not •/ exceed the height of the h dro eolo is interval under investigation. 2/2/13 Once vertical characterization is approximated for each source area,lateral The workplan and addendum indicate that additional vertical characterization contaminant definition may commence. of lithology and extent of hydrocarbon constituents should begin at the area of highest known contamination,which is presumed to be the source area. 2/2/14 All wells installed and surveyed shall be referenced to an appropriate and DTSC guidance for installing monitoring wells is specified in the workplan design red benchmark. addendum. 2/2/15& 16 Report the results of your investigation to this agency within 30 days of See proposed schedule,included as Attachment B to the workplan addendum. completion of the approved scope of work. 2/3 Please note,you are requested to immediately pursue any off-site access Off-site encroachment permits can not be finalized until locations for CPT agreements that you may need to complete your investigation activities. surveys,soil borings and wells area reed to by PHS/EHD. 2/4/all You shall also evaluate the probability of the contaminants plume The well survey update submitted to PHS/EHD on March 30, 1998 provides a encountering preferential conduits that could spread the contamination detailed survey of wells in the vicinity of the Disco property. particularly in the vertical direction.The conduit study is to include a detailed survey of all wells in the vicinity.Please contact the DWR for procedure to request well information.Please include prints of historic aerial photos used as part of your study and use data tables and maps to report the data collected as art of your survey.Report your results in the SWI report requested below. 2/5/1 &2 ...During SWI activities,we request that you gather detailed lithologic The workplan addendum inclues cone penetrometry and provides for t information using borings,continuous core sampling,dual tube expedited site continuous coring during soil borings,as needed. assessment methods or cone penetrometry together with other methods to understand the hydrogeology at your site. 2/5/3 Discrete soil samples collected from each significantly different lithological The workplan specifies that soil samples from distinct lithological units unit shall be analyzed by a qualified laboratory for permeability,porosity, encountered in the proposed deep monitoring well near the source area(MW- bulk density,moisture,and organic carbon content. I1 D)be analyzed for permeability(ASTM method 5084),dry bulk density (ASA 930.2,moisture content(ASTM D2216)and total organic carbon ASTM D2974).Porosity can also be determined,if needed. 2/5/4 We also request that you evaluate local groundwater flow conditions and The addendum specifies that the report prepared for the investigation should establish asite-specific localized flownet that is dependent on hydrology and include this analysis. geologic conditions and is reflected on h dro eolo is cross sections... I SFOt98WPTABLE2.D0C