SU0003877 SSNL - Laserfiche WebLink

Home Browse Search

i KLEINFELDER Lvineyards/agricultural crops and any cattle waste both on- and off-site are probably the largest contributors of nitrogen to groundwater in the project vicinity. On October 13, 2003, a representative with our firm obtained samples of groundwater using clean procedures from the previously mentioned well located in proposed parcel 4. The samples were immediately placed in a chilled cooler, transported to our office, and stored in a refrigerator until they were picked up the same day by Sequoia Analytical using chain-of- custody procedures for DBCP and nitrate (l) testing. The results of the tests and a copy of the chain-of-custody are attached. 5. SOIL PROFILE r The subsurface conditions at the site were explored at about 6:00 am on October 20, 2003, by drilling one boring on each of the proposed 4 parcels to depths of between approximately 5 to ►- 10 feet below existing grade. The borings were drilled using a Simco 2400 truck-mounted drill rig equipped with 6-inch O.D. solid-stem auger. The approximate boring / percolation test locations and approximate dimensions from reference points are presented on the site plan. Based on our findings, the subsurface soils encountered consisted predominately of silty sand to the maximum depths explored. Between 1 and 1-%: feet of surficial sandy silt was encountered at the percolation test locations on proposed Parcels 1 and 3. More-detailed descriptions of the subsurface conditions encountered during our field investigation are presented on the attached Logs of Borings. Based on ournn 'or e2tperienre the moderately permeable, near-surface sand in the project area yields percolation tees nas iAg S_ TCEHD percolation requirements. The Soil Survey of San Joaquin County, California published by the U.S. Department of Agriculture, Soil Conservation Service (1992) refers to the near-surface soils within the project area as belonging to the Hicksville, Madera, Pentz, and Pentz / Bellota soil series (Map Symbols 170, 195, 207, and 209, respectively). The soils are described as having severe percolation characteristics due to depth to bedrock and possible cementation. Other attributes are given in the table below: Map Available Water Organic Content, Symbol Soil Name Capacity, inches/inch pH percent 170 Hicksville 0.11-0.20 6.1-7.8 1-3 195 Madera 0.04-0.08 6.6-8.4 <1 207 Pentz 0.11-0.15 5.6-7.3 1-3 209 Pentz/Bellota 0.04-0.06 6.1-7.3 <2 V L L37050.G01/ST03R1750 November 20,2003 ©2003 Kleinfelder,Inc. Page 3 of 6