SITE INFORMATION AND CORRESPONDENCE CASE 2

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�LE/NFELDER �Bngh[Rtapl�Rlgh[b1U40M. ' 1 EXECUTIVE SUMMARY This report details the results of the second quarter 2014 groundwater monitoring at the California Natural Products (CNP) facilities in Lathrop, California. The work was authorized by Mr. Lynn Forcum of CNP of Lathrop, California. This monitoring report is required by the Central Valley Region of the State of California Regional Water Quality Control Board's (RWQCB) Revised Monitoring & Reporting Program No. R5-2003-0141. Groundwater samples were collected for laboratory analysis during the second quarter of 2014 from three monitoring wells in the McKinley Avenue Rapid Infiltration Area (MARIA), located south of the CNP plant, and six monitoring wells in the North and South Louise Avenue Infiltration areas (NLAIA and SLAIA OR N/SLAIA). Groundwater sample results were compared to the California Environmental Protection Agency, Central Valley Regional Water Quality Control Board, A Compilation of Water Quality Goals, 2011. Groundwater quality tests indicated that concentrations of pH were within the acceptable Secondary Maximum Contaminant Level (SMCL) ranges of 6.5 to 8.5 in all wells (7.18 to 7.45). Ammonia as nitrogen (N) was detected in seven of the nine groundwater samples collected with concentrations ranging from 0.11 milligrams per liter (mg/1) to 0.32 mg/L. The detected concentrations of ammonia as N did not exceed neither the Suggested No Adverse Response Levels (SNARL) of 30 mg/L or the Taste and Odor Threshold of 1.5 mg/L. Ammonia as N was not detected at or above the laboratory reporting limit in the remaining two samples. ' The concentration of total dissolved solids (TDS) ranged from 510 to 1,100 mg/I throughout the site. The TDS concentrations exceeded the recommended SMCL of 500 mg/1) in all of the nine wells and/or the SMCL upper level (1,000 mg/1) in only one well sampled this quarter. Nitrate as N concentrations ranged from 0.9 to 16 mg/I across the site. Five of the nine groundwater samples collected from the site (L-2, L-3, L-4, L-6 and W-5) exceeded the nitrate as N Maximum Containment Level (MCL) of 10 mg/I. Nitrate as N was not detected at or above the laboratory reporting limit in the remaining four samples. 101486.7/SAC14R02453 Page 1 of 14 July 25, 2014 ©2014 Kleinfelder