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P <br /> PUBLIC HEALTH SERVIC?S OP�UIN C <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION ` <br /> Karen Furst, M.D., M.P.H., Health Officer �.. <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 q�iFoa J <br /> 209/468-3420 <br /> GENE GABBARD <br /> P O BOX 1260 <br /> STOCKTON CA 95212 AUG 2 6 1999 <br /> RE: Gene Gabbard, Inc. SITE CODE: 1090 <br /> 640 N. EI Dorado St. <br /> Stockton CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the "Work Plan Addendum for Subsurface Investigation", <br /> dated August 19, 1999, that was submitted by Ground Zero Analysis, Inc. (Ground <br /> Zero) on behalf of the above referenced site and has the following comments. <br /> The addendum proposes to continue the investigation of the lateral extent of <br /> petroleum hydrocarbon contamination documented at the above referenced site <br /> with a series of five direct-push soil borings to a maximum depth of 30-feet below <br /> surface grade (bsg). Soil samples and one grab groundwater sample for analysis <br /> will be collected from each boring. <br /> The addendum does not propose to investigate the vertical extent of groundwater <br /> contamination. It is the recommendation of PHS/EHD that vertical site definition in <br /> the source area is investigated prior to beginning the investigation of the lateral <br /> contaminant distribution. The initial phase of work at this site included the <br /> collection of two grab groundwater samples from soil borings, one reported at 26- <br /> feet bsg and another at 31-feet bsg. Both evidenced free-product hydrocarbons, <br /> as noted in the laboratory analytical report. A site characterization is not complete <br /> until definition of the vertical and lateral extent of evidenced contamination in both <br /> soil and groundwater has been made. The vertical extent of groundwater <br /> contamination must be defined before this site can move towards remediation and <br /> eventual closure. In a telephone conversation with Ground Zero on 08/23/99, <br /> PHS/EHD was informed that vertical definition in groundwater would be addressed <br /> by use of a discrete sampling device in future site mobilizations. <br /> As significant groundwater contamination at this site has been documented to at <br /> least 31-feet bsg, all future borings to collect groundwater samples for <br /> investigation of the lateral extent of the plume should be extended to at least this <br /> depth. Please note that should future investigations document contamination, in <br /> either soil or groundwater, at depths greater than 31-feet bsg, the investigation of <br /> lateral contaminant distribution will have to be extended to this depth. <br /> A Division of San Joaquin County Health Care Services <br />