Laserfiche WebLink
i <br /> ' 1444 MARIPOSA ROAD <br /> WKA No 2307 02 <br /> December 15, 1993 <br /> IPage 4 <br /> ' Monitoring Well Development,.Purging and_Sampling <br /> Following well construction, the water level in each well was measured with an electronic well <br /> sounder and each well was subsequently, checked for free product using a clear polyethylene <br /> ' bailer The wells were then developed using a 31h-inch diameter vented surge block ' <br /> Approximately three well volumes of water were removed from each with a clean, submersible <br /> ' pump until temperature, pH and conductivity readings stabilized and/or the water cleared of <br /> sediment After a minimum of 24 hours after development, water levels in the wells measured, <br /> ' and the water checked for visual signs of free product using a clear polyethylene bailer <br /> Approximately three additional well volumes of water were then purged from each well using a <br /> clean, submersible pump until temperature, pH, and conductivity readings stabilized and/or the <br /> water cleared of sediment The water samples were then collected using new polyethylene <br /> disposable bailers Water from the bailers was decanted into appropriate sample containers <br /> provided by the laboratory The samples were immediately placed in an ice-chest containing ice <br /> and submitted under chain-of-custody to a California-certified laboratory for analysts of TPH <br /> using EPA method 8015 and BTEX using EPA method 8020 A clean "travel blank" of distilled <br /> water was transported along with the water samples for the purposes of detecting cross- <br /> contamination during field activities The travel blank was analyzed for TPH and BTEX using <br /> the above EPA methods <br /> each wellsolution <br /> Pumping equipment was cleaned prior to development and purging of ear a with a ot <br /> ' trisodium phosphate and distilled water to minimize the potential for cross-contamination All <br /> water removed during development and purging operations was placed in sealed, labeled 55- <br /> gallon drums and stored on-site ' <br /> Subsequent to installation and completion, well locations and elevations were surveyed by a <br /> ' California licensed surveyor to aid in the estimation of hydraulic gradient and flow direction <br /> 000 <br /> ' WALLACE KUHL <br /> Recycled paper Er ASSOCIATES INC <br />