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BUC HEALTH SER ICESPUQu�N <br /> SAN f OAQ -W COUNTY <br /> r.- <br /> A\ ." <br /> a: <br /> in. X <br /> JOGI KHAMNA M.D..M.P.H. <br /> Health Officer .. P <br /> P.O. Box 2009 • (1601 East Hazelton Avrnue) • Stockton, California 95201 <br /> (209)468.3400 <br /> FRED LONG <br /> PDM STROCAL <br /> 2324 NAVY DRIVE [� MAR 2 3 1992 <br /> STOCKTON CA 95203 <br /> RE: PDM STROCAL SITE CODE: 18952 <br /> 2324 Navy Drive <br /> Stockton CA 95203 <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has recently evaluated documents in the file <br /> for the above mentioned site and has the following comments for <br /> your consideration. <br /> Reports which have been submitted have not been reviewed and <br /> signed by a registered professional as required by Sections 6735, <br /> 7835, and 7835. 1 of the California Business and Professions Code. <br /> The input of a registered professional is essential for the <br /> proper assessment of your site. <br /> Residual contamination, 51 ppm total petroleum hydrocarbons - <br /> diesel, remains after the re-excavation attempt of June 1989. <br /> The sample confirming contamination was taken at a depth of less <br /> than 5 feet to groundwater; therefore, ;the Leaching Potential <br /> Analysis cannot be applied. The Leaching Potential Analysis is <br /> used to determine the amount of contamination which can be left <br /> in place. The contamination which remains should be defined by <br /> soil sampling and be supported by groundwater monitoring data. <br /> The groundwater gradient of the site has not been established and <br /> one sampling well is not located within 10 feet of the former <br /> tank pit in a verified downgradient direction. In the <br /> circumstance when nearby wells are not available to establish <br /> groundwater gradient, a minimum of three monitoring wells are <br /> necessary to establish groundwater gradient. There already :are <br /> located on site two monitoring wells, MW-1 and MW-2 . <br /> Unfortunately, PHS/EHD documents indicate that MW-2, near the <br /> western boundary of the re-excavation, is improperly constructed. <br /> Depth to groundwater was previously above the screened interval <br /> of the well. If after the next monitoring event the depth to <br /> groundwater remains above the screened' interval, this well cannot <br /> be used as a sampling well; but, it can be used as one of the <br /> three wells necessary to establish groundwater gradient. <br /> A Division of Can Joaquin County Hcaith(are Services <br /> 7 <br />