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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY Y .� <br /> JOG[KHANNA M.D.,M.P.H. 3 <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) •Stockton, California 95201 04 1 <br /> (209)468-34o0 <br /> JUAN QUIJANO <br /> TRI VALLEY GROWERS <br /> P O BOX 1211 <br /> MODESTO CA 95353 FED a 5 19193 <br /> RE: 11 SOUTH "A" STREET SITE CODE: 2040 <br /> STOCKTON CA <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has completed the review of the "Phase II <br /> Workplan" dated July 1, 1992, submitted by Thomas J. Vogel and <br /> Associates and has the following comments. <br /> The use of a hand auger to obtain confirmation soil samples for <br /> possible site closure justification is not recommended by <br /> PHS/EHD. Drilling using a hollow stem auger is the preferred and <br /> accepted method for ensuring the integrity of the borehole during <br /> the drilling process and for obtaining representative soil <br /> samples. This method also allows for better soils identification <br /> by the field geologist during the drilling process. All of these <br /> factors add to the reliability of the data collected and allows <br /> PHS/EHD to effectively evaluate the data to determine the final <br /> status of the site. <br /> If total lead is detected in the soil samples at or above 15 <br /> parts per million, the samples should then be subjected to the <br /> waste extraction test using deionized water as the extraction <br /> solution. This additional test will identify what portion, if <br /> any, of the total lead is soluble and possibly mobile under <br /> normal site conditions. <br /> Pursuant to Section 2625 (d) of the Underground Storage Tank <br /> Regulations and until site closure is granted, a status report <br /> must be submitted to PHS/EHD on a quarterly basis. <br /> At a minimum, the quarterly report should include, in tabular <br /> form, all past and current data generated to date, a brief status <br /> update on work completed during the reporting quarter and any <br /> work anticipated for the following quarter. <br /> A Mvision of Sun Joaquin County Health(arc Services <br />