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i �RZA�� . Working To Restore Nature 1710 Main Street Escalon, CA 95320 Phone (209) 838-3507 FAX (209) 838-3509 June 3, 1994 J U i1 L u 1994 Ms Diane Hinson ENVIRONMENTAL HEALTH PERMIT/SERVICES San Joaquin County Public Health Services Environrnental Health Division P O Box 2009 Stockton, CA 95201 Subject Second Quarter 1994 Monitoring Report, Diamond Walnut Growers, 1050 South Diamond Street, Stockton, California Dear Ms Hinson- This letter serves as RESNA Industries' (RESNA) Second Quarter 1994 Monitoring Report for the above referenced site (Plate 1) INTRODUCTION RESNA's activities during the second quarter of 1994 included monitoring water levels and collecting groundwater samples from the three shallow on-site monitoring wells (MW-1, MW-2, and MW-3), monitoring the former irrigation well (IW), analyzing the collected groundwater samples for hexavalent chromium and preparation of the quarterly report GROUNDWATER MONITORING AND SAMPLING On April 28, 1994 RESNA personnel conducted quarterly monitoring and sampling at the above referenced site The wells were monitored, purged, and sampled in accordance with RESNA's Quality Assurance/Quality Control Plan (Appendix A, "Technical Symnwa and Re ort o Ftrs Ouaner Monitonng", June 10, 1992) Field work consisted of measuring depth to water, purging the wells and collecting one sample from each of the three monitoring wells Groundwater levels in the monitoring wells ranged from 67 30 to 70 67 feet below grade, an average rise in water level of 125 feet since water depth was last measured in February 1994 The groundwater flow direction on April 28, 1994 was northeasterly with a hydraulic gradient of 0 001 ft/ft, or approximately 5 28 ft/mile Plate 2 shows groundwater elevation contours for April 28, 1994 The groundwater monitoring data are isummarized in Table 1 Monitoring data and purge logs are provided in Attachment 1 OW05641QUARTLY�2QR-1994 PNL