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`� SERVICESPUBLIC HEALTH <br /> SAN JOAQUIN COUNTY Q � <br /> JOG[KHANNA&i D,M.P H <br /> Health Officer <br /> P.O. Box 2009 <br /> • 1601 East Hazelton Avenue) • Stockton,California 95201 <br /> (209) 468-3400 <br /> MIKE MCNULTY f E <br /> UNION ICE LIMITED <br /> POBOX 108 JUN. 1 1. 199 <br /> STOCKTON CA 95201 <br /> Re: Union Ice SITE CODE: 241434 <br /> 425 North Union <br /> Stockton CA 95205 <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD)has completed review <br /> of the "Phase II Site Assessment, Report of Findings" dated May 4, 1992 and prepared by WHF <br /> Environmental. PHS/EHD has the following comments for your consideration. <br /> PHS/EHD agrees that re-excavation of the contamination associated with the former tank #4 is appropriate. <br /> Soil boring B1, drilled January 13, 1992, encountered contamination at 20 feet of 380 ppm TPH-diesel. <br /> Toluene contamination,80 ppb,was also documented at 35 feet,the termination of B1. Please submit a work <br /> plan for the proposed re-excavation within the next quarterly report due August 14, 1992. Residual <br /> contamination remaining at the conclusion of the re-excavation attempt,will require additional remediation. <br /> The investigation of the residual contamination associated with the former tank #3 occurred with the <br /> installation of MW1 on January 21, 1992. Toluene contamination, 80 ppb, was documented at 55 feet, the <br /> termination of MW1. Although,the initial groundwater sample did not detect contamination,because there <br /> is only one monitoring well on site, the groundwater gradient cannot be determined. It is necessary to install <br /> two additional monitoring wells in order to verify site specific conditions and thus conclusively evaluate <br /> groundwater conditions. Please initiate quarterly monitoring of MW1 for further evaluation of residual <br /> contamination. Please be informed that PHS/EHD has discussed the pumping rate used for sampling,with <br /> WHF Environmental. Future pumping rates, for sampling, will be reduced to 100 mis/min._ Additionally, <br /> please note that PHS/EHD was on site March 11, 1992 to witness the sampling of MWL Purging of this well <br /> had not been accomplished when PHS/EHD left the site. PHS/EHD was not informed of the March 13, 1992 <br /> sampling event. <br /> Please note that PHS/EHD inspections of sampling events are an important aspect of local regulatory <br /> oversight. Schedule the next sampling event by June 30, 1992. Within the next quarterly report, due August <br /> 14, 1992, also include an estimate of residual contamination associated with the former tank #3. <br /> If you have any questions, please contact Mary Meays, RENS, of my staff at (209)468-0337. <br /> Jogi Khanna, M. , M.P.H. <br /> Health r - <br /> Laurie A. Cotul a, REHStion am Manager <br /> Environmental Health Di <br /> LAC/MM:lb <br /> c: Elizabeth Thayer, CVRWQCB c: Steve Furnas, WHF Environmental <br /> A Dmsion of tiara Joaquin County Hcaith tare Semces � J <br />