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unpm � ;_ -;' •, } 3- Stockton Service Station February 29, 1988 Quote No. 661OG Page 3 casing and the borehole. The sand pack will be installed to a level approximately one to two feet above the slotted screen section where bentonite will be used -- as a seal. The remaining portion of the annular space will be sealed with a neat cement and bentonite grout mix according to SJLHD specifications. The top of the well will be set in a traffic rated box at grade with an internal locking cover to provide security. SJLHD regulations require that a County Inspector be on site to observe the placement of the well seals. The County will bill the Client for the Inspectors time at a rate of $35.00 per hour. This fee is in addition to the prices listed herein. - Task 2.4 Well Deyelor)ment After construction, the well will be developed to improve the hydraulic conductivity between the well and the natural formation. The development will consist of manually bailing or mechanically pumping to remove residual silts and clays left from the drilling operations. At least ten (10) well volumes of ground-water will be removed. After development, the well will be allowed to recharge for approximately 24 hours, enabling Exceltech to collect a reptezentative water sample and to measure the thickness of any floating product; if present. Any contaminated water resulting from the development of the wells will be placed in drums. The property owner is responsible for disposal of any contaminated water. Fxceltech can assist in arranging for transportation and disposal of any contaminated water on a time and material cost basis. Task 2.5 Ground-Water Sampling Samples of the ground water will be collected from the monitoring wells. The r sample will be collected with a ^lean bailer and will be transferred to the appropriate laboratory supplied bottles. Samples will be labeled, logged on chain of custody forms and placed in an ice chest for transport to a State Certified laborat.:ry for analysis. If floating product is observed, only the depth to groundwater eitc the thickness of the floating product will be recorded. Normal field measurements during ground-water sampling include pH, conductivity, and water temperature. --- --------==-------Task-2.6------ rye., 4. ---- ---- -- -.--- ---- --=-- - -------------- -- -------- For the presentation of the data-:and an accurate determination `of the g wells and groundwater flow direction, it is important to locate the monitorin i