Common use of Sampling Procedure Clause in Contracts

Sampling Procedure. Soil samples were collected in brass tubes using a hand-driven sampler. A 25-lb sliding weight on the sampler's steel shaft drives the sampler's head into the soil. The sampler's head contains a 2 by 6-inch brass tube that collects the soil. Once filled with soil, the brass tube was removed from the sampler, capped at both ends, and further sealed with elastic tape. An identification number was attached to the brass tube and it was 121 placed in an ice-packed cooler. All brass tubes were pre-washed in soapy water to remove any potential chemicals or oils. The sampler was cleaned between borings to prevent cross contamination. All second phase samples were collected in duplicate and one set was sent to the San Mateo County Health Department. Subsurface soil samples in the refuse fill area collected in the third sampling phase were sampled at five-foot intervals until groundwater was encountered. Five of the ten sample sites allowed a second deeper sample at approximately ten feet below the ground surface. For each of the five locations, the resulting dual-depth samples were later composited into single samples by the analytical laboratory prior to analysis. However, the composited samples were not used for the pesticide analyses due to likely interference from plastic refuse; only samples collected at the first depth were analyzed for pesticides.