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PUBLIC H`VALTH SERVICES <br /> SAN JOAQUIN COUNTY r y <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> DONALD & MAE SALMON AUG 0 4 1999 <br /> 616 S MAIN STREET <br /> MANTECA CA 95336 <br /> RE: Manteca Equipment Rental SITE CODE: 1434 <br /> 616 S. Main Street <br /> Manteca, CA 95336 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the "Work Plan for Subsurface Investigation", dated 7/30/99, submitted by Ground <br /> Zero Analysis, Inc. (GZA) for the above referenced site and has the following comments. <br /> Soil samples collected following the December 18, 1990 removal of two 500-gallon underground <br /> storage tanks (UST) from the subject site evidenced petroleum hydrocarbon contamination. <br /> The submitted work plan proposes to begin the investigation of the extent of the contamination <br /> with a series of direct push soil borings. One boring for vertical definition will be advanced to <br /> approximately 30-feet below surface grade (bsg) in the area of the former tank pit. Three other <br /> borings for lateral definition will be advanced to surround the former tank pit. These borings are <br /> anticipated to extend to approximately 15-feet bsg, to encounter first groundwater. Continuous <br /> core soil samples will be collected in acetate sleeves. Selected soil samples will be submitted <br /> for analysis, and will include the deepest sample collected from the central boring. A water <br /> sample for analysis will be collected from the central boring, though the work plan did not state if <br /> this sample will be collected at depth or at first encountered groundwater. Should field <br /> conditions dictate it, other water samples for analysis may also be collected. It is the <br /> recommendation of PHS/EHD that, should field observations indicate that vertical definition has <br /> not been made by the above outlined activities, the soil borings be advanced to greater depths <br /> until such definition has been made. Please note that borings advanced below groundwater <br /> must be filled with neat cement grout applied from the bottom up by use of a tremmie pipe. <br /> The work plan as outlined above is approved. Please proceed with scheduling the fieldwork. A <br /> copy of the issued well permit is being forwarded to the listed C-57 licensed driller. Please note <br /> that 48 hours notice to PHS/EHD is required prior to beginning fieldwork. If you have any <br /> questions or comments please call Lori Duncan at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Lori Duncan, REHS Margaret Lagono, REHS <br /> LOP/Site Mitigation Unit IV Supervisor, Unit IV <br /> cc: Mark List, CVRWQCB <br /> Greg Stahl, GZA <br /> A Division of San Joaquin County Health Care Services <br />