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SEkVICESPUBLIC HEALTH �. .� <br /> SAN JOAQUIN COUNTY w <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer {�tFs �•� <br /> 304 East Weber Avenue,Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> PEGGY MARSHALL <br /> MANTECA 'UNIFIED SCHOOL DISTRICT <br /> P O BOX 32 <br /> MANTECA CA 95336 <br /> RE: MANTECA USD AG SHOP BUILDING SITE CODE:506563 <br /> 2901 LOUSE AVE <br /> MAN'IECA.CA 95336 <br /> WORKPLAN:Work Plan Subsurface Soil and Groundwater Investi ation .Sho Buildin <br /> DATED: 07/26/2001 PREPARED BY: M 1.Kloberdanz-&Associates <br /> 25- APPROVED(with Conditions See below) <br /> ❑ DISAPPROVED <br /> ❑ ADDENDUM Submit by: <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN W 25299.37,subd.(c)(3).): <br /> 1. 3 exploratory soil borings in the area of the disclosed contamination to 35 feet bsg and at least 10 feet <br /> below groundwater level,but no more than 20 feet beneath the top of the aquifer. Minimum 3 soil <br /> samples per boring will be collected for laboratory analyses of diesel and BTEX. <br /> 2. The soil borings will be converted to monitoring wells. Perform quarterly sampling of the monitor <br /> wells. <br /> 3. Conductor casing will be used before installation of the monitoring well if deeper aquifer is to be <br /> investigated. <br /> 4. Perform a 2000-foot receptor well survey. <br /> COMMENTS AND CONDITIONS: <br /> 1. Collect and analyze groundwater samples from the domestic water well south of the former UST. <br /> Collect water sample from the well head and allow at least 15 minutes of flow before sampling in <br /> accordance to California Code of Regulations,Title 22,Division 4,Chapter 15,Article 5.5,Section <br /> 64445. <br /> 2. Section 2.2 of the work plan called for placing bentonite or cement and bentonite grout at the bottom <br /> of the boring as necessary before installing the monitoring well casing. If cement is used,at least 24 <br /> hours must be allowed for of set up before placing well casing and sand pack. <br /> 3. Obtain well permit and submit appropriate permit fee to PHS/EHD before commencement of work- <br /> Permits <br /> orkPermits are issued to G57 licensed holders only. <br /> 4. Selection of samples for analyses must include PHS/EHD comments and agreement. <br /> 5. Schedule work with PHS/EHD before finalizing the work schedule. <br /> 6. Implement the proposed work by October 5,2001. <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN(H&S 25299.37,subd.(Q(3)): <br /> None if the conditions are met Ij <br /> DATED j qj Z24 By <br /> Cc: CRWQCB,Central Valley Region--Marty Hartzell <br /> Cc: M.J.Kloberdanz&Associates-Michael Kloberdanz <br /> A Division of San Joaquin County Health Care Services <br />