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STATE OF CALIFORNIA PETE WILSON Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD, SUITE A <br /> {`?,lV 3 <br /> SACRAMENTO, CA 95827-3098 <br /> PHONE. (916) 361-5600 <br /> FAX (916) 361-5686 <br /> 17 May 1991 $� � 14v' <br /> MAY 2 1 1951 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Mr. Paul Yerma <br /> City of Tracy <br /> Department of Public Works <br /> 520 West Tracy Boulevard <br /> Tracy, CA 95376 <br /> CONTAMINATED SOILS FROM SCHULTE ROAD EXTENSION PROJECT, CITY OF TRACY, SAN <br /> JOAQUIN COUNTY (CASE# 3573) <br /> Enclosed is an inspection memorandum from a recent inspection of the proposed <br /> Tracy Land Treatment Facility. The purpose of the inspection was to collect <br /> samples of the petroleum contaminated soils for qualitative analysis. <br /> Previous sampling events by the City of Tracy (City) were quantitative in <br /> nature and no actual analysis was done on the soils at the site to determine <br /> if any volatile components of petroleum hydrocarbons were present in the soils <br /> onsite. <br /> The additional analysis was necessary because the City proposes to use <br /> contaminated soils with no volatile components and less than 800 ppm of total <br /> recoverable hydrocarbons (TRH) as fill below road base at two road <br /> construction projects. Results from samples representative of the soils <br /> containing less than 800 ppm of TRH indicate that no volatile components were <br /> present in the soils. Therefore, use of the contaminated soils below 800 ppm <br /> TRH (which average between 100-200 ppm) as fill , presumably, will not impact <br /> or threaten to impact water quality. <br /> The City may proceed with its plan to use approximately 5000 cubic yards (CY) <br /> of the contaminated soils as road base. The City is also required to field <br /> test the 5000 CY soils prior to moving the soils offsite. We recommend the <br /> use of a Combustible Gas Indicator or Photoionization Detector to insure that: <br /> a) the soils removed from the site do not contain significant levels of <br /> petroleum hydrocarbons; and b) the personnel working at the site are not <br /> overexposed to hydrocarbons present in the air. The remaining soils which are <br /> below 800 ppm TRH may remain onsite in the storage cells as long as the soils <br /> remain covered. <br /> Results for samples representative of the soils which exceed 800 ppm indicate <br /> that volatile components are present. These soils are a threat to water <br /> quality and may cause negative health effects to personnel that come into <br /> contact with the soils. Therefore, in addition to the City submitting a <br /> workplan delineating how the City will treat and/or dispose of the <br /> contaminated soils, the City must also submit a Health and Safety Plan <br /> prepared by a qualified professional for all related work with these soils. <br />