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STATE OF CALIFORNIA di <br /> GEORGE DFUKMEJIAN,Goverrrar <br /> CkFiiF RNIA REGIONAL WATER R QUALITY CONTROL BOARD— <br /> C9NTRAL VALLEY REGION <br /> 3443 ROUTIEIR ROAD <br /> SACRAMENTO,CA 95827-3058 <br /> App / .41- <br /> 27 April 1987 : <br /> ENVIROrOE -SAL HEALTH <br /> FFRfvltl/SEf1V1OLS <br /> Mr. William C. B. Villet MS, Mary Metcalf <br /> Dames apd Moore Chevron Pipe Line Company <br /> 500 Sansome Street 555 Market Street <br /> San Francisco, CA 941.11 San Francisca, CA 94120 <br /> ALDDENN PARK, PHASE II SITE ASSESSMENT WORK PLAN, TRACY, SAN JOAQUIN COUNTY <br /> Thank you for submitting the subject Work Plan Addendum I requestec! in our <br /> recent phone conversation. The brief summary and diagram of work completed to <br /> date was very helpful . <br /> The proposal for construction of monitoring wells through the concrete slab has <br /> been modified sufficiently to address the Regional Board' s concerns, with one <br /> exception. A seal of adequate quality will be required between the 16" steel <br /> casing and the concrete slab to assure water quality is not affected below-slab <br /> due to leakage from above-slab waters. <br /> If this adjustment is agreed upon we will allow construction of the monitoring <br /> wells based on the information and construction methods given in the subject <br /> Work Plan Addendum. Any other changes in construction techniques must be <br /> cleared with this office. <br /> The preceding approval of this work plan does not negate the Regional Board's <br /> contention that penetration of the concrete slab may allow further/new con- <br /> tamination to occur. The approval is based solely on Chevron' s (ands Dames & <br /> Moore' s ) opinion that these wells are essential to a detailed site assessment. <br /> Any contamination that may occur from installation of these wells must be <br /> cleaned up. <br /> Please respond to this approval at your earliest convenience and give us about <br /> 48 hours advance notice before beginning construction. <br /> If you have any questions regarding this matter, please call me at (916) <br /> 361-5667. <br /> DAVID L. BRENT <br /> Project Engineer <br /> DL6:jj <br /> cc: Mr. Ron Valinoti , San Joaquin' Local Health District, Stockton <br /> Mr. Steve Woodruff, Chevron Pipe Line Company, San Francisco <br />