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MW 6&1 <br /> PUBI HEALTH SEACES ,aP4 <br /> SAN JOAQUIN COUNTY =` <br /> JOGI KHANNA H.D.,M.P.H. <br /> Health Officer <br /> Cq <br /> P.O. Box 2009 0 (1601 East Hazelton Avenue) 0 Stockton, California 95201 CiFpit <br /> (209) 468-3400 <br /> DON ROEK Copy <br /> ROEK BROTHERS CONSTRUCTION MAR 2 E 1992 <br /> P 0 BOX 30038 <br /> STOCKTON CA 95213-0038 <br /> RE: 102 S. Wilson Way SITE CODE: 9031 <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health Division has completed the review of <br /> the file on the above mentioned site and has the following comments. <br /> Pursuant to Section 2652(d) of the Underground Storage Tank Regulations (California Code of <br /> Regulations, Title 23, Chapter 16) a quarterly monitoring report shall be submitted to Public Health <br /> Services, Environmental Health Division and the Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) until the investigation and cleanup of the site is deemed adequate. Please begin submitting <br /> quarterly monitoring reports immediately. The report is to show the: <br /> -status of investigation and cleanup activities including the results of all investigations <br /> completed to date; <br /> -proposed continuing or next phase of investigation; <br /> -method of cleanup proposed or implemented, schedules for the completion of the <br /> investigation of the site and remediation; <br /> -method and location of disposal of the released hazardous substance and any <br /> contaminated soil, groundwater or surface water; <br /> -manifest required for transport of hazardous substances; <br /> -monitoring well data including groundwater elevation, pH, conductivity, gradient; <br /> -analytical results of groundwater or soil sampling; and <br /> -site map showing the 'zero line" of contamination, if known, and changes in the above <br /> measurements over the last quarter. <br /> The extent of the groundwater contaminant plume at this site needs to be physically defined. Additional <br /> monitoring wells need to be installed to determine the downgradient and upgradient extent of the <br /> groundwater contamination. Additional monitoring wells may also be required to replace those wells <br /> that have gone dry due to the recent drop in the water table. A minimum of three functional monitoring <br /> wells are needed in order to determine the groundwater gradient direction on a regular basis. <br /> Soil boring TBS, drilled in 1989 by Leedshill-Herkenoff, Inc., shows high levels of total petroleum <br /> hydrocarbons as gasoline in the soil from 5 feet below ground surface (BGS) to 25 feet BGS. San <br /> Joaquin County Flood Control Maps (spring 1983 and 1986) record the seasonal high groundwater level <br /> for this site at approximately 40 feet BGS. Due to the short distance between the 25 foot sample and <br /> seasonal high groundwater, these levels of petroleum hydrocarbons are considered to be an actual <br /> and/or potential threat to the groundwater and, therefore, this area of the site will need to be <br /> investigated further. <br /> A Division of_an Joaquin Counry HeWth Care Services 10 <br />