Laserfiche WebLink
Soil Suitability/Nitrate Loading Study <br /> Proposed Global Carrier Inc. ■ Manteca, California 1rerracon <br /> August 8, 2018■ Terracon Project No. NA187034 <br /> Table 3. <br /> Summary of Laboratory Data. <br /> DBCP*(Ng/L) EDB*(Ng/L) Nitrate as N** Nitrate as NOV* <br /> Sample Date Sample ID MCL=0.2 pg/L MCL=0.05 (mg/L) (mg/L) <br /> pg/L MCL=10 mg/L MCL=45 mg/L <br /> GW1 --- --- 13 58 <br /> June 25, 2018 GW2(1 of 4) <0.010 <0.020 --- --- <br /> GW2(2 of 4) <0.010 <0.020 --- --- <br /> Bold-Detected above EPA maximum contaminant level(MCL),---Not analyzed for this constituent, `EPA Method E524.3, "EPA <br /> Method E300.1 <br /> Based on a review of the laboratory results, Nitrate as N was detected in groundwater sample <br /> GW1 at 13 mg/L, slightly above the Maximum Contaminant Level (MCL) of 10 mg/L. Nitrate as <br /> NO3-was detected at 58 mg/L above the MCL of 45 mg/L. DBCP and EDB were reported below <br /> laboratory detection limits for groundwater sample GW2 (1 of 4)and GW2 (2 of 4). A copy of the <br /> laboratory report and chain of custody are included in Appendix D. <br /> 1.4.5 Groundwater Sample Handling <br /> Refer to Section 1.4.4. <br /> 1.5 General Geologic Information and Soil Profile <br /> The site is depicted on the Geologic Map of California 2010, as within generalized quaternary <br /> Pleistocene and Holocene deposits which are comprised primarily of alluvium, lake, playa, and <br /> terrace deposits; unconsolidated and semi-consolidated. Mostly nonmarine, but includes marine <br /> deposits near the coast. <br /> Based on a review the United States Department of Agriculture (USDA) Natural Resources <br /> Conservation Service (NRCS) Web Soil Survey, site soils consist primarily of Delhi loamy sand <br /> with 0 to 2 percent slopes. Parent material is alluvium derived from granite. Typical soil profiles <br /> consist of 0 to 26 inches loamy sand and 26 to 60 inches sand. Approximately one percent of the <br /> site along the northeastern border consists of Delhi fine sand with 0 to 5 percent slopes. Delhi <br /> fine sand parent material is wind-modified alluvium derived from granitic rock sources. Typical <br /> soil profiles consist of 0 to 60 inches fine sand. Delhi loamy sand soils and Delhi fine sand soils <br /> are considered somewhat excessively drained. <br /> The USDA Soil Survey of San Joaquin County indicated the main limitations of the two soil types <br /> are rapid permeability in the substratum and potential groundwater contamination issues due to <br /> seepage. Additionally, tillage pans may form if soils are tilled when wet and can be broken with <br /> chiseling, ripping, or subsoil breakup. <br /> Responsive■ Resourceful ■ Reliable 9 <br />