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t JA STEFFEN ROBERTSON AND KIRSTEN October 29, 1991 rMs L A Cotulli, REHS Program Manager i Public Health Services, San Joaquin County 1601 E Hazelton Avenue Stockton, California 95201-2009 Re Diamond Lumber, 151 S Main, Manteca, Caltforrua, Site 2483 Sampling of Fxtsttng Wells Dear Ms Cotulla On October 15 199 t 1, Steffen Robertson and Kirsten (U S ) Inc, (SRK) completed monitor well sampling of the three existing wells, MW-1, MW-2, and MW-3 at the above referenced site Prior to collecting groundwater samples, a sequence of bailing and monitoring was completed in order to ensure that representative samples were collected The sequence is described on a well- by-well basis as follows MW-3 Opened the cap on the %tell at 1250 T7ic temperature of the water in the well was measured by a thermometer which was allowed to equilibrate for S to 10 minutes The thermometer was then retrieved and the temperature recorded The initial water temperature measured was 74'F We checked it a second time and recorded 71'F as the water temperature We recorded well depth from the top of the well casing as 29 feet 10 inches The water depth measured at this well was 25 feet i inch from the top of the well casing A gas odor was apparent after initially opening the well cap We proceeded to bail by had using a 1050 ml disposable PVC baiter One discrete bailer was used for each well The water was clear at first, but became Cloudy with grayish suspended particulates after the third bailing Stopped baiting this well around 1450 when ony getting about 2 inches in the bailer At 1520 the temperature of the water in the well was measured to be 71'F and I inch of water was retrieved in the bailer We elected to allow the well to recharge and then sample Will MW 3 was sampled at 1615 Before acquiring a sample,we steam-cleaned each of the bailers and then rinsed them with distilled water The water samples taken at this well were clear and without suspended material The samples were put immediately into a cooler with blue ice to maintain a temperature of 4•C during shipment to the laboratory MW-2 MW-2 was opened at 1415 Water temperature,well depth,and water depth were measured using the same techniques as described for MW-3 The initial water temperature measured was 74'F, but the second measurement was 71T The well depth was measured to be 30 feet and the water depth was measured to be 25 feet 8 inches The water from this welt had more of a sewage smell than a gas smell The water remained clear throughout the bailing This well was quick to recharge We bailed this well for about 45 minutes accomplishing approximately 8 bailings every S minutes The water samples were clear and without suspended solids The samples were immediately placed in a cooter with blue ice MW-I MW4 was opened at 1445 Water tCmpc,a,u,c, well depth, and water depth were measured using similar techniques described for well MW 3 The water temperature measured at this well was 71'T' rhe welt was measured to be 29 feet 4 inches and the water depth to be 2-5 feet 1 inch, all measured from top of casing Steffen Robertson and Kirsten (U S ) Inc 15311 NE 90th Street Redmond Washington 98052 U S A Tel (206) 881 2233 Facsimile (206) 881-1581 .,..• .�« .k Other off cps in U S A Canada United Kingdom and Africa