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1 <br /> PUBLIC HEALTH SER ICES OP4u,N^ C <br /> SAN JOAQUIN COUNTY <br /> r. .z <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> c(o <br /> 4 n Joaquin Street • P. O. Box 388 Stockton, CA 95201-0388 <br /> C4�i P oa a`P <br /> D 209/468-3420 <br /> 0 199i, <br /> AUTO INVESTMENT CO ASSOC. AUTO INVESTMENT CO ASSOC. <br /> C/O ROBERT CHASE WILLIAM CHASE <br /> 6310 HIDDEN ACRES C/O GERALD SPERRY <br /> STOCKTON CA 95212 1818 GRAND CANAL BLVD. <br /> STOCKTON CA 95207 <br /> RE: 423 N. Madison St SITE CODE: 1163457 <br /> 424 N. Van Buren SITE CODE: 2511 <br /> Stockton CA <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) has <br /> reviewed the third quarter monitoring report dated October 7, 1994 submitted by RESNA for <br /> the above referenced site. <br /> The data from the report of the Madison St. site indicate that the downgradient extent of the <br /> plume has been determined to terminate prior to reaching the location of MW-8. The plume has <br /> not been defined south of MW-1. Groundwater data from wells MW-2, MW-4 and MW-5 <br /> indicate that these wells are within the fringe of the plume boundary. At this time the off site <br /> extent of the plume east of MW-4 is unknown. <br /> The level of contamination reported in MW-9 located at the northern site property line of the <br /> Van Buren Street site at 60 ppm TPH-g indicates that the downgradient portion of the plume <br /> extends off site to the north. MW-7 and MW-6 also demonstrate elevated contamination levels <br /> and indicate that the plume may extend off site to the west. <br /> Water samples obtained as grab samples from soil boring SB-3, SB-4 and SB-5 indicate elevated <br /> contamination levels in the groundwater at these locations. SB-5 was drilled in the most <br /> upgradient location at the site. Ground water contamination in this location suggests that <br /> contamination is migrating up gradient or there is another source downgradient of the site. <br /> The free product removal system installed at the Van Buren Street site appears to be functioning <br /> to reduce the amount of free product beneath the site. <br /> In a letter dated November 16, 1993 from PHS/EHD to Auto Investments PHS/EHD states that <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 PHS/EHD <br /> and the Central Valley Regional Water Quality Control Board (CVRWQCB) until the <br /> investigation and cleanup of the site is deemed adequate. The report is to show proposed <br /> A Division of San Joaquin County Health Care Services <br />