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Ms.Margaret Lagorio <br /> Mr Ronald Rowe <br /> Table 1, Page 1 <br /> June 18, 1998 <br /> Table 1-Status of Del Monte Food's Responses to October 14,1997 PHS/EHD Letter Re:Disco Property <br /> Page/ Requirement/Recommendation Response <br /> Paragraph/ <br /> Sentence <br /> 1/3/all Prepare a series of comprehensive hydrogeologie cross sections which display "Former Disco UST Facility Data Summary and Visualization"submitted to <br /> all borings and wells...soil strata...all known chemical analytical data PHS/EHD on February 4, 1998. <br /> t. <br /> sampling points... <br /> 1/4/all ...perform a detailed,expedited site assessment ...to define and quantify the The 1997 workplan and 1998 addendum describe additional CPT,soil boring <br /> full three-dimensional extent of suspected contaminants in soil and and groundwater monitoring to define vertical and horizontal extent. <br /> roundwater. PHS/EHD approval required to proceed. <br /> 2/l/all ...analyze all water and selected soil samples for tertiary butanol,MTBE, Ongoing quarterly groundwater monitoring includes analysis for fuel <br /> DIPE,ETBE,and TAME...Selected soil samples shall include the historic oxygenates as well as TPH and BTEX.Workplan addendum adds oxygenate <br /> low and high groundwater elevation equivalent and the current capillary analysis and specific sampling depths to 1997 workplan soil sampling tasks. <br /> fringe. <br /> 201 A workplan...has been reviewed...and an addendum is required... Workplan addendum submitted on June 1998. <br /> 2/2/2 Additional boreholes shall be distributed...which employ the findings of the Workplan addendum includes provision for additional borings <br /> comprehensive site h dro eolo is cross sections... <br /> 2/2/3& 4 At least four boreholes shall be continuous cores....collected in approved 1997 workplan specifies a minimum of six boreholes to be continuously <br /> sampling sleeves...appropriately logged...and employed to further define any logged,and four boreholes to be sampled.Addendum adds soil sampling to all <br /> fume which may have originated from the former or current use...at this site, additional borings and continuous coring,as needed <br /> 2/2/5&6 The workplan shall be revised to consider historic low and high groundwater The workplan provides for installation of two to three additional deep <br /> elevation in the definition of the vertical aspect of contaminant distribution... monitoring wells and three additional shallow monitoring wells to define <br /> groundwater may have been in excess of 110 feet below surface grade during vertical extent.Exact depths of deep wells arenot currently specified in the <br /> the fall of 1978. workplan because the depth needed to define vertical extent of hydrocarbon <br /> constituents is not known.Workplan addendum proposes CPT and <br /> groundwater constituent screening prior to well installation to estimate <br /> required depth of deep monitoring wells. <br /> 2/2/7 Conventional monitoring well networks existing and proposed...may be Activities in workplan and addendum are designed to define the extent of <br /> insufficient to properly locate and define the extent or existence of petroleum petroleum hydrocarbons, <br /> hydrocarbon/fuel additive plumes as evidenced by the vertical and horizontal <br /> variations of contamination observed at this site. <br /> 2/2/9 ...monitoring wells must be placed...with appropriate discrete screen intervals The workplan provides for shallow wells to be screened across the current <br /> based on site specific findings(preferential pathways/contaminant loading) ground water table and deep wells to be screened at the necessary depth to <br /> not arbitrary depths as proposed(each borehole may require more than one define the vertical extent of hydrocarbon constituents in groundwater. <br /> well completion). <br /> SF0l98WPTABLE2.00G <br />