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. GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone: (209) 838-9888 <br /> Facsimile: (209) 838-9883 <br /> January276 <br /> R F C i� 0 f E `_" <br /> 25, 1999 <br /> JAN 2 5 1999 <br /> Mr Mike Infurna ENVIRONMENTAL HEALTH <br /> San Joaquin County Public Health Services, PERMIT/ SERVICES <br /> Environmental Health Division <br /> 304 E Weber Ave , 3rd Fl <br /> Stockton, CA 95202 <br /> Subject Center Street Parts/Kilpatrick-EarthGrains Bakery <br /> 1717 Center St , Stockton, CA 95206 (Site Code 2371) <br /> Workplan Addendum for Monitoring Well Installation <br /> Dear Mr Infurna <br /> • At your request we are writing to provide you with this addendum to our December 11, 1998 <br /> workplan for groundwater monitoring well installation at the subject property This addendum is <br /> intended to provide the additional information you requested <br /> Site Location Figure 1 depicts the location of the site <br /> ® Proposed Monitoring Well Locations The proposed locations of the three groundwater <br /> monitoring wells are shown on Figure 2 Except for the monitoring well within the former <br /> UST pit, the well locations are subject to change as field conditions and access dictate <br /> • Monitoring Well Construction The previous consultant reported encountering saturated <br /> soil in boreholes "PH-1" and "PH-2" at a depth of approximately 50 feet below grade, <br /> groundwater subsequently rose in the borings to approximately 25 feet below grade (Philip <br /> Environmental, June 2, 1998) The consultant attributed this to confined groundwater <br /> conditions in March, 1998 depth to water at an Exxon station located approximately 500 <br /> feet north-northeast of the subject site was approximately 25 feet below grade and flow was <br /> to the southeast Exxon's consultants, EA Engineering, do not believe that confined <br /> conditions exist at the Exxon property and believe that the current depth to water is <br /> approximately 20 feet below grade (Kyriacos Kyriacou, personal communication) <br /> A lack of certainty exists with respect to confined vs unconfined groundwater conditions <br /> This, coupled with the fact that samples collected from saturated soil at 50 feet in the <br /> i <br /> gregcraonladdendum <br />