Laserfiche WebLink
STATE OF CALIFORNIA <br /> PETE WILSON, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— «° <br /> CENTRAL VALLEY REGION " <br /> 3443 ROUTIER ROAD, SUITE A <br /> SACRAMENTO, CA 95827-3098 <br /> PHONE: (916) 361-5600 <br /> FAX (916) 361-5686 f"YAY � <br /> 15 May 1991 <br /> MAY 2 0 1991 <br /> ENVIRONMENTAL HEALTH <br /> PERM ITISRRVIUS <br /> Mr. Paul Verma <br /> City of Tracy <br /> 520 W. Tracy Blvd. <br /> Tracy, CA 95376 <br /> REVIEW OF 7 MAY 1991 TECHNICAL REPORT, SCHULTE ROAD EXTENSION PROJECT, TRACY, <br /> SAN JOAQUIN COUNTY <br /> We have reviewed your 7 May 1991 Technical Report Schulte Road Extension <br /> Project, Tracy, CA, and found that several issues will have to be addressed <br /> before we can approve the use of petroleum contaminated soils as fill in road <br /> construction projects. <br /> Our primary concern is that road use will not impact ground water in the <br /> future. On page 5 of the Report, it states that the contaminated soil will be <br /> separated by more than seven feet of native soils. The Report does not <br /> indicate the seasonally high ground water level or how much the ground water <br /> fluctuates seasonally. Furthermore, the Report does not state what type of <br /> soil makes up the vadose zone in the proposed fill areas. <br /> To date, the City has not identified what fractions of the total hydrocarbons <br /> are present in the contaminated soils. The City needs to characterize the <br /> soils to ensure that volatile components are not present in the soil which <br /> might leach out of the soil . The City needs to submit a sampling workplan <br /> showing how they will collect and analyze the samples. The workplan should <br /> include a rationale for the sampling and analytical method chosen, as well as <br /> a proposal for QA/QC work. <br /> If the City can demonstrate that volatile components are not present in the <br /> soil proposed to be used as fill , then no further qualitative characteriza- <br /> tions will be necessary. However, if volatile components are present, then <br /> the City will be required to demonstrate that hydrocarbons will not leach into <br /> ground water should the soil come into contact with ground water. We <br /> recommend the use of a Waste Extraction Test (WET) with deionized water to <br /> analyze composite samples of the soils proposed to be used as fill . <br /> Additionally, we have a concern about previous work discussed in the Report. <br /> First, it was suggested that since no benzene was detected in the set of <br /> samples taken from Cell 19, the reported level of 34 ppb in the first sample <br /> was due to analytical error. However, neither the QA/QC data submitted with <br /> the Report nor any other documentation supports this conclusion. We request <br /> that the City have the laboratory director send us a letter stating what type <br /> of analytical error occurred during analytical testing. <br />