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�:. i Z KLEI N rEEtDER Aground water monitoring well will be constructed in three of the last soil borings along radial lines. To preclude the introduction of contaminants into the underlying ' water, monitoring wells were not installed in soil borings where there is g high i' Sh concentration of petroleum hydrocarbons, Locking well covers were installed at the surface to protect the wells and allow traffic ? movement. The covers were slightly above grade and a tapered cncrete apron was constructed around each well cover to prevent surface runoff froom entering the well. i MONITORING WELL DEVELOPMENT f AND SAMPLING PROCEDURES The monitoring wells were developed after installation. Each w ell w clear acrylic bailer to visually,inspect the sample for a product la eras first sampled with a or sheen. No product layer or sheen was observed on the water samples. The wells were then developed wig a surge block and bladderum , F P Surging with the tool along the screened interval of the well was performed to draw the sediment from the formation into and out of the well, and to set the sand pack. The sediment laden water was pumped from the well. Each well developed until the discharge water ran relatively'clear of fines. Approximately was € i ten well volumes were removed from each monitoring well. The discharged water wasplaced in clean, Department of Transportation approved, 55-gallon hazardous waste Water frori each well was placed "n separate drums, labeled with well identification, 1 dated. After the svells were developed, the formation was allowed to stabilize for f approximately one week before sempling. The sampling procedures were initiated by measuring the depth-to-static-water _ All well caps were removed and the piezometric presence Cowed to equilibrate with atmo hericr p essure prior to measuring the depth of water. The well was then purged and sampled with a bladder pump. During the pu rging of the we Nfieldconductivity, temperature) were monitored. Samples were co�ll ct dpters afterethe field parameters had stabilized. After_collecting-the--samples,.-the-sample--bottles-were-- ------- _-- -- — - - trntaediately-sealed and placed in an iced cooler. At the end of the field day, the water -- samples were delivered to Chemwest Laboratories of Sacramento,California. EBMUD-001-84.001 a. ..r B-4 ,�r