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Wm. J. Hunter & Associates 2220 Loma Vista Dr, Registered Geologists _ Sacramento, CA 95825 Petroleum &Mineral Appraisers (916) 972-7941 r FAX (916) 972-1683 e, February 15, 1999 Carol Oz, Sr. REHS San Joaquin Co. PHS Environmental Health Division Site Mitigation Unit 304 E. Weber Street, 3rd. Floor Stockton, CA 95202 Re: 1000 E. Eleventh street, Tracy, CA Per your request for backup data concerning our letter of January 25, 1999, we are enclosing a copy of the calculations that were made for estimating the amounts of contamination removed and remaining in the soil beneath the site. The calculated volumes are in metric units. To convert kilograms to pounds, multiply by 2.2. The justification for closing this site are summarized below: • The UST's product lines & dispensing pumps have been removed from the property. • A minimum of 200 cubic yards of contaminated soil has been removed from the site. There are no records concerning the disposition of soil after removal of the two UST's, but field evidence suggests that some material was disposed of at that time. • Based upon calculations from field results and laboratory analyses, it is estimated that a minimum of 387 pounds of petroleum hydrocarbons have been removed from the site. Those same calculations indicate that approximately 14 pounds of hydrocarbons may still be present in the soil. This is a 96% reduction in volume. The majority of the remaining contamination is immobilized beneath the existing building and cannot be removed. • Soil samples taken from the the three groundwater monitoring wells did not reveal A any contamination, and all water samples taken from 4 monitoring events between October, 1996 & September, 1998 have been below detection limits. • The domestic water well in the southeast corner of the property has not revealed any petroleum hydrocarbon substances.