Laserfiche WebLink
VALLEY-AG ■ <br /> R E S E A R C H R <br /> VAR#: SS-014.93 May 14, 1993 <br /> CLIENT: A & L Western Laboratories, Inc. <br /> 1311 Woodland Avenue, #1 <br /> Modesto, CA 95351 <br /> PROJECT: Pacifex Fertilizer Plant <br /> P.O. Box 1197 <br /> French Camp, CA 95231 <br /> SUBJECT: Soil Sampling for Nitrogen Analyses <br /> On May 13, 1993, Valley Ag Research performed soil sampling procedures for A & L Labs <br /> at the Pacifex Fertilizer plant in French Camp, CA. These samples were retrieved from the <br /> stormwater runoff area, adjacent to the southern end of the fertilizer storage warehouse. <br /> A & L Labs will perform the nitrogen analyses on the soil samples. This investigation was <br /> conducted at the request of Ms. Wendy Wyels, Land & Water Use Analyst for the Central <br /> Valley Regional Water Quality Control Board. <br /> Before sampling was initiated, the stormwater basin area was measured, as can be noted on the <br /> attached plot map. Six boring sites were then determined at approximate equidistant locations <br /> over the basin area. A seventh site (Boring #7), which was subject to basin water runoff this <br /> past winter was also sampled. In addition, a background or baseline site (Boring 48), away <br /> from any potential contamination influence, was sampled. <br /> Four soil horizons or depths were selected for analyses: the 0"-12", 12"-24", 24"-36" and the <br /> 36"-48" depth. The top clay layer in the basin area, consisting of 2"-3" of bentonite, was <br /> omitted from the 0"-12" horizon. This bentonite layer was not sampled since it may contain <br /> a higher concentration of nitrate molecules, thus creating an inaccurate representation of this <br /> top 0"-12" horizon. However, the surface soil of Boring #7 and #8 was included in the 0"-12" <br /> horizon. <br /> Our sampling procedure began with retrieving the 2"-12" horizon for each of the six basin bore <br /> sites with a stainless steel bucket auger. The 12"-24" horizon was sampled next for each of <br /> the six sites. Sampling continued in this sequence until all six basin sites and all four depths <br /> were sampled. This procedure prevented any possible mix-up of sample depths. Boring #7 <br /> and #8 were then sampled and each of the four horizons were placed in separate plastic bags. <br /> P.O. Box 3794 - Turlock, California 95381 - (209) 668-2505 <br />