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April 23, 1998 96-1113008.80 State of California Department of the Youth Authority Facilities Planning Division Attention: Ms. Corinda Yep, Chief-Hazardous Materials and Waste Program Subject: LETTER-REPORT-Re-Sampling of Former Diesel Underground Storage Tank Locations Northern California Youth Correctional Center 7650 South Newcastle Road Stockton, California Page 7 stockpiles/backfills of four of the six UST stockpiles/backfills; ■ Native soil beneath the USTs has not been impacted; ■ Approximately 60 feet of low permeability soil separates the stockpiles/backfills from groundwater; and ■ When strictly following the LUFT manual guidelines, 1,000 mg/kg TPH-d can be left in-place without threatening groundwater. If soil types are considered, which LUFT does not, it is reasonable that 10,000 mg/kg could be left in-place, if warranted. PROFESSIONAL CERTIFICATION This report has been prepared by The MARK Group, Inc., (MARK) under the professional supervision of the Principal, senior staff, and consultants whose seals and signatures appear herein. The findings, interpretations of data, recommendations, specifications or professional opinions are presented within the limits prescribed by available information at the time the report was prepared, in accordance with generally accepted professional engineering and geologic practice and within the requirements by DYA. There is no other warranty, either expressed or implied. The data and findings of this report are based on the readily available data and information obtained from public and private sources. Additional studies (at greater cost)may or may not disclose information which may significantly modify the findings of this report. We accept no liability on completeness or accuracy of the information presented and or provided to us, or any conclusions and decisions which may be made by DYA or others regarding the subject Site. This report was prepared solely for the benefit of DYA. MARK consents to the release of this report to third parties. However, any use of or reliance upon this report shall be solely at the risk of such party and without legal recourse against MARK, or its subcontractors, affiliates, or their respective employees,officers, or directors, regardless of whether the action in which recovery of damage is sought is based upon contract, tort (including the sole, concurrent or other negligence and strict liability of MARK),statute or otherwise. This report shall not be used or relied upon by a parry that does not agree to be bound by the above statements.