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ell <br /> GROUNDWATER INVESTIGATION REPORT <br /> ADDITIONAL WORK .RECOMMENDATIONS <br /> EHD SITE CODE # 2015 <br /> MARCI DIESEL <br /> 2969 Loomis Road <br /> Stockton, CA <br /> PREVIOUS WORK & REPORTS <br /> , <br /> All previous work was discussed in the ' <br /> reports by Wm. J. <br /> Hunter & Associates , - (3 ) "Proposed Work Plan-Installation of- <br /> Monitor Wells, Soil and Groundwater Sampling For: <br /> Groundwater Investigation Report" , dated 2/7/1992, and <br /> (2) "Groundwater Investigation Report" , Marci. Diesel , Site <br /> Code # 2035, dated May, 1992 . These reports are not <br /> appended; � however, they both have been submitted to the EHD <br /> and will be resubmitted if requested.,, , <br /> DISCUSSION OF , <br /> CURRENT STATUS OF WORK OPERATIONS <br /> On August 24, 1992, PHS, EHD responded to WJH' s report. # 2 <br /> with the attached letter (Attachment '# 1) , in which <br /> additional work was requested for soilplume delineation and <br /> for the completion of an additional monitor well located in <br /> a down-gradient direction. <br /> WJH does not agree with the need for either additional soil <br /> plume delineation or for an additional monitor well for the <br /> following: reasons : <br /> (1) The entire soil profile to the extent of the monitor <br /> wells bored was almost entirely clay, with perhaps 10 <br /> percent maximum -sand-. -Water wells i,n-,the area are generally <br /> completed below 150 feet'l, vss owing to. this dearth of <br /> productive interval . <br /> (The sand content was difficult to exactly quantify <br /> owing to almost zero sand recovery. The gross amount of <br /> sand is inferred from small amounts seen in core <br /> recovery and from Department of Water Resources, <br /> Bulletin No. 46, San Joaquin County Ground Water <br /> Investigation, July, 1967) . <br /> (?) There` has � been no evidence that the groundwater is <br /> contaminated; all water samples have had zero contaminants . <br /> The fact that the groundwater gradient was not found to <br /> conform to the regional gradient indicates to the reviewers <br /> i <br /> 2 <br />