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Antonia Vorster -2- 18 May 1990 <br /> C. Three shallow wells, one east of LVMD #2, one at the northern site boundary <br /> and the other at the southeast corner of Gettysburg Place and Benjamin Holt <br /> Drive appear adequate. <br /> D. Soil boring and test well locations appear adequate. <br /> 4. San Joaquin County municipal wells LVMD #2 and #6 have been taken off line, LVMD <br /> #1 is occasionally in operation. Our memo which is attached to our 21 December <br /> 1989 letter, clearly requires investigation of the LVMD wells (Page 7, #6). The <br /> Phase II sampling plan does not include examination of these wells other than two <br /> sampling rounds on LVMD #1. <br /> 5. Investigation of off-site pollution across Gettysburg Place near monitoring well <br /> #4 must be included in the sampling plan. The soil gas survey shows significant <br /> levels of PCE near the sewer line which leaves the property at this location. LH <br /> recommends that this off-site investigation be delayed so remediation on-site can <br /> be accelerated. The off-site pollution concentrations may be as significant as <br /> on-site and should be defined with this phase of the assessment. <br /> 6. San Joaquin County' s requirement for a 50 foot sanitary seal and a minimum <br /> distance from sewer lines is for drinking water wells and does not apply to <br /> monitoring wells. <br /> RPM:ej <br />