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` ENVIRON-irIENTAL HEALTH k0EPARTMENT <br /> 'O Pd U 1 N CO <br /> -, SAN JOAQUIN COUNTY <br /> a' ? Donna K. Heran, R.E.H.S. Program Coordinators <br /> Director 304 East Weber Avenue,Third Floor Carl Borgman, R.E.H.S. <br /> Laurie A. Cotulla,R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S.,R.D.I. <br /> •.cgCi Fo'RAP• Assistant Director Telephone: (209)468-3420 Margaret Lagorio,R.E.H.S. <br /> Robert McClellon, R.E.H.S. <br /> Fax: (209)464-0138 Jeff Carruesco,R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Kasey Foley, R.E.H.S. <br /> MAR 0 2 2007 <br /> LODI CITY CENTER 12 LLC <br /> C/0 ANTHONY BARKETT JOSEPH K NEWFIELD <br /> 2800 MARCH LANE STE 350 1900 LOWER SACRAMENTO ROAD <br /> STOCKTON CA 95219 WOODBRIDGE CA 95258 <br /> RE: Lodi Theater Project SITE CODE: #1371 <br /> 107 School Street <br /> Lodi CA 95240 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed Monitoring <br /> Well Abandonment Work Plan (Work Plan) dated January 1, 2007, and the Work Plan <br /> Addendum (Addendum) dated February 22, 2007 submitted on your behalf by Advanced <br /> GeoEnvironmental, Inc. (AGE) and has the following comments. <br /> In the Work Plan AGE proposes to destroy by pressure grouting seven groundwater <br /> monitoring wells and 16 remediation wells associated with this site. The monitoring wells are <br /> all individually accessible from the surface. The tops of the remediation wells were all buried <br /> below surface grade (bsg) and connected at one central manifold in an underground vault. <br /> AGE proposes to pressure grout the remediation wells from the manifold. <br /> SJC/EHD and AGE personnel met at the site on February 14, 2007 to discuss the issue of <br /> destruction of the remediation wells. These wells are connected together at the manifold in <br /> groups of two, three or four wells. It was agreed that AGE would calculate the internal <br /> volume of each group of wells to determine how much grout would be required for proper <br /> destruction and submit the results to SJC/EHD prior to submitting the destruction permit <br /> applications. It was also agreed that one group of sparge points would be tested first to see <br /> if the proposed destruction process would work. AGE has selected group SW-4/SW-6 for the <br /> test. If pressure grouting of the remediation wells from the manifold does not work, the tops <br /> of the wells will have to be exposed and each well will be destroyed individually. <br /> AGE submitted their calculated volumes of the remediation well groupings in the Addendum. <br /> In reviewing the calculations SJC/EHD considers the estimated volumes to be uniformly low. <br /> In addition, AGE did not include calculated estimates of how much grout would be needed to <br /> fill the void space of the filter pack surrounding the screened intervals of the well casings. In <br /> discussion with AGE they stated that a reasonable estimate of that void space would be 30 <br /> percent of the total filter pack volume. Calculating the void using the 30 percent estimate it <br /> appears that the amount of grout needed to fill the filter packs would increase the amount of <br /> grout needed to destroy each well cluster approximately 100-150% for the vapor well groups <br /> and approximately 20-30% for the sparge well groups. <br />