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r� <br /> PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUN r' <br /> JOGI KHANNA 1I.D.,M P H. <br /> Health Officer ' <br /> P.O. Box 2009 • (1601 East Hazelton Avenue)• Stockton, California 95201 <br /> c9c+ko'R°' P <br /> (209)468-3400 <br /> AUG - 51991 <br /> 1991 <br /> JOHN DIECKMAN EXECUTOR <br /> MARITAL DEDUCTION TRUST <br /> 500 AIRPORT BLVD STE 200 <br /> BURLINGAME CA 94010 <br /> RE: System 99 IN REPLY REFER TO SITE CODE: 1275 <br /> 501 S. Ventura <br /> Stockton, CA <br /> Public Health Services, Environmental. Health Division, (PHS/EHD) <br /> has completed review of the report dated July 1, 1991, containing <br /> first and second 1991 quarterly samping results. PHS/EHD has the <br /> following comments to be addressed in your next quarterly report. <br /> 1. The investigation of pos ible tidal influences on <br /> groundwater depths and gra fent was requested by this <br /> office in a letter dated March 12, 1991. The <br /> fluctuations of groundwater depth measured quarterly <br /> since August, 1990 warrant monthly monitoring for a <br /> minimum of one quarter. Please commence monthly <br /> monitoring. <br /> 2. The PHS/EHD letter dated January 5, 1990, requested that <br /> residual contaminants remaining at the conclusion of the <br /> re-excavation attempt be addressed in a Soil Remediation <br /> Plan. The results of the October, 1989 re-excavation <br /> indicate that petroleum contamination is still present. <br /> The leaching potential analysis was done for this site <br /> and indicated that residual contamination exceeded <br /> acceptable levels. A copy is enclosed for your <br /> information. No action, as a remedial alternative, is <br /> unacceptable. <br /> 3 . Groundwater contamination as been monitored for four <br /> quarters. There has not been a significant decrease in <br /> concentrations of petroleum contamination. The increase <br /> of petroleum contamination of groundwater between <br /> quarterly sampling as stated in the July, 1991 report <br /> further suggests that the source of contamination has not <br /> been removed. Zero lines for groundwater contamination <br /> A Division nF San Joaquin County Health Care Services <br />