ARCHIVED REPORTS XR0001834 - Laserfiche WebLink

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2.0 ONSITE ACTIVITIES 2.1 Drum Samaline A total of six 55 gallon drums were found to be present at the southeast corner of the site (Figure 4) These drums were labeled as containing nnsate from previous groundwater monitoring event well purging activity The drums were found to be old with numerous holes in the sides Only one drum contained rinsate water This drum was sampled on February 28, 2003 by use of a ladle that was held approximately one foot below the base of the water surface Two 40 ml VOA containers were filled with the liquid and transported to Kiff Analytical Laboratories in Davis, California for analysis The water sample (PT-Drum#1) was analyzed using USEPA Test Method 8015M for TPH-gas and Test Method 8020 for BTEX All analytical results were reported to contain analytes below analytical method detection limit Copies of the analytical laboratory report are contained in Appendix 1 The one drum containing rinsate liquid was placed on the former bioremediation stockpile area of the site 2,2 Groundwater MonitoriAg • Groundwater monitoring wells for the 521 North Cherokee Lane (former Parmar Texaco site) were monitored on April 1, 2003 The locations of the monitoring wells are depleted on both Figures 3 and 4 A quarterly groundwater monitoring report (QMR) is anticipated to turned 1n to PHSEHD as a separate document for this quarter 2.3 Groundwater Monitoring Results The shallowest groundwater in this portion of the city of Lodi is reported to occur under unconfined conditions (Environmental Forensic Investigations, 2002) On April 1, 2003 the highest point measured from the monitoring wells was 8 36 feet (ms]) and occurred in monitoring well PT-MW-2 The lowest elevation of the groundwater surface measured from the monitoring wells was 8 31 feet (msl) and occurred in monitoring well PT-MW-3 The average depth to groundwater surface in the eight monitoring wells was approximately 45 feet below ground surface (bgs) The groundwater surface has risen an average of 6 to 6 5 feet since the last monitoring event (October 20, 1994) Electrical conductivity concentrations in the monitoring well water samples were determined to range from 200 to 400 umhoslcm This low-conductivity value is typical of reported electrical conductivity values of local groundwaters found near the Mokelumne River (Figure 2) Mam\D\Environmenta[\ParmarTexaco\Reports\033103QSR wpd 3