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,ATE OF CALIFORNIA �� PETE WILSON Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD, SUITE A �:s <br /> SACRAMENTO, CA 95827-3098 p R <br /> PHONE: (916) 361-5600 APR 2 7 1;)9� <br /> FAX: (916) 361-5686 ENVIRONMEN1AI HEALTH <br /> 24 April 1991 PCRf�IT/Sr I'%,�;, j <br /> Ms. Margaret Lagorio <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. 0. Box 2009 <br /> Stockton, CA 95202 <br /> REVIEW OF FINAL REMEDIATION PLAN FOR ROYAL OAKS SAVINGS &LOAN - 310 NORTH MAIN <br /> STREET - MANTECA, SAN JOAQUIN COUNTY <br /> Below is a staff review of Royal Oaks Savings & Loan's Remediation Report. <br /> The following staff comments should be incorporated with your correspondence: <br /> 1. We agree that the excavated soil at the site has been sufficiently <br /> remediated and no further action regarding this soil is required. We <br /> recognize that some contaminated soil was left near MW2 in the southwest <br /> corner of the site. The quantity of the remaining contaminated soil left <br /> in the ground near MW2 is to be calculated. <br /> 2. In the Final Remediation Plan, Addendum #II, dated 24 January 1991 , you <br /> proposed to begin pumping the ground water and to use the water for <br /> on-site construction use if levels of hydrocarbons were nondetectable. If <br /> detectable levels of hydrocarbons were found in the water, then it was to <br /> be treated and discharged into the city sewer. Since then, in a follow-up <br /> Letter Report, dated 29 March 1991, you request to continue monitoring <br /> only, because the levels of contamination have dropped to nondetect for <br /> all but one of the wells. We recommend that you continue to do quarterly <br /> monitoring. <br /> 3. The ground water flow direction has. varied from the northeast to the <br /> southeast at different sampling events. Several wells have been installed <br /> at the site; however, if the gradient is to the northeast, there is no <br /> downgradient well . Therefore, a monitoring well is to be installed and <br /> sampled between MW4 and MW6 by 3 June 1991. <br /> 4. The domestic well identified as well #8 on plate #3 of the Preliminary <br /> Report, dated 28 November 1988, is about 800 feet downgradient from your <br /> site and must be sampled for TPHg• and BTEX. <br /> If you have any questions, please call me at (916) 361-5723. <br /> JAMES MAUGHAN <br /> Area Engineer <br /> JBM:gs <br />