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Pringle Avenue, Suite <br /> Wal Woodward Clyde Consultants <br /> .. Walnut Creek,CA 94596-35656 4 <br /> 415-945-3000 <br /> July 8, 1987 <br /> 8720064A <br /> [05a <br /> rcnnnnr <br /> Mr. Doug Wilson +el " 1987 <br /> San Joaquin County Health Department <br /> 1601 E. Hazelton Avenue ENVIROMENTAL HEAETM <br /> Stockton, California FERMIT/SERVICES <br /> Dear Mr. Wilson: <br /> In compliance with state and county requirements, this letter has been <br /> prepared and the various application enclosed to request permits for the <br /> installation of five groundwater monitoring wells at the LOF Glass Company <br /> Facility in Lathrop, California. As discussed previously, these well <br /> installations will be conducted in association with an environmental <br /> assessment we are currently preparing of the property to the west and south <br /> of the existing LOF facility. The purpose of the assessment is to evaluate <br /> the possible presence of hazardous materials as a condition of the sale of <br /> the property. The areas have historically been used primarily for <br /> agricultural purposes and, as such, are not anticipated to contain any <br /> hazardous materials resulting from operations at LOF. <br /> The installation and sampling of the five new monitoring wells will <br /> supplement the existing monitoring and water supply wells in an effort to <br /> provide adequate coverage of the sale property. Two of the wells will be <br /> located near the sand ponds along the south east property line while the <br /> other three will be located just to the south of the facility in an ara <br /> where batch dust, cullet and broken windshields were stored. The <br /> approximate well locations are shown in Figure 1. <br /> The new wells will be completed to a depth of 20 feet with the screened <br /> interval extending from 5 feet below grade to completion depth. The wells <br /> will be constructed of 2-inch I.D. , threaded PVC casing with 0.010-inch <br /> factory slotting. An auger rig with 8-inch C.D. hollow stem augers will be <br /> used to install the wells. The annulus around the casing will be packed <br /> with VA sand to 2.0 feet above the screened interval . A 2-foot bentonite <br /> seal will be installed above the sand pack with a neat cement/bentonite <br /> grout used to complete the well to the surface. A lockable steel "stick <br /> up" sleeve will be used to protect and secure the wellhead. <br /> The primary purpose of the wells is to evaluate possible groundwater <br /> contamination although the wells around the process waste storage area will <br /> also be used to sample the soil . Therefore, no soil sampling is proposed <br /> for the two wells adjacent to the sand ponds while soil samples will be <br /> taken in the other three wells at depths of 2, 7 and 12 feet. Following <br /> their completion, the wells will be developed by purging and surging and <br /> Consulting Engineers,Geologists <br /> and Environmental Scientists <br /> Offices in Other Principal Cities _ <br />