SITE INFORMATION AND CORRESPONDENCE CASE 2

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DER Bright Brght FWRIe.Right S ugoox 1. EXECUTIVE SUMMARY This report details the results of the Second Quarter 2012 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 2012 from three monitoring wells in the McKinley Avenue Area, located south of the CNP plant, and six monitoring wells in the North and South Louise Avenue areas. Groundwater quality tests on all samples collected from the site indicated that concentrations of pH were within the acceptable Secondary Maximum Contaminant Level (MCL) ranges of 6.5 to 8.5 in all wells (7.17 to 7.49). The concentration of total dissolved solids (TDS) ranged from 380 to 960 mg/I throughout the site. The TDS concentrations exceeded the recommended Secondary MCL (SMCL) of 500 mg/I in seven of the nine wells sampled this quarter. INitrate as N concentrations ranged from 3.2 to 32 mg/I across the site. Three of the nine groundwater samples collected from the McKinley Avenue Area (L-2, L-3, and W- 5) exceeded the nitrate as N MCL of 10 mg/l. Total Kjeldahl Nitrogen (TKN) was detected in six of the nine groundwater samples collected with concentrations ranging from 0.25 to 1.1 mg/I. There was no noted RWQCB water quality goal for TKN. Ammonia as N was detected in eight of the nine groundwater samples collected with concentrations ranging from 0.2 to 0.24 milligrams per liter (mg/1). The Water Quality 101486.5/STO12R0588 Page 1 of 14 July 31, 2012 Copyright 2012 Kleinfelder