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"1 Kennedy/Jenks Consultants 112 .4 Engineers and Scientists 3336 Bradshaw Road Suite 140 Sacramento,California 95627 7 January 1994 916 362 3251 FAX 916 362 9915 Ms Diane M Hinson, REHS Public Health Services San Joaquin County Environmental Health Division P 0 Box 2009 Stockton, CA 95201 Subject Groundwater Sampling Results - Fourth Quarter 1993 Cal-Farm Supply - Stockton Facility KIJ 922540 00 Dear Ms Hinson This letter transmits the results of the groundwater sampling event performed at the Cal-Farm Supply - Stockton Facility in the fourth quarter of 1993 This sampling event was conducted in accordance with our sampling plan approved by you in your undated letter received in our office on 15 November 1993 9 DECEMBER 1993 GROUNDWATER SAMPLING EVENT On 9 December 1993, groundwater samples were collected from monitoring well MW-1 by a Kennedy/Jenks Consultants geologist Prior to sampling, groundwater elevations were measured and recorded for each onsite monitoring well, with the exception of monitoring well MW-2 Monitoring well MW-2 was obscured by a large amount of vegetative debris The current lessee of the warehouse facility at the site was present during the sampling event and stated that the debris would be moved prior to future sampling events The groundwater flow direction was calculated in the field based on the elevation measurements collected from wells MW-1, MW-3 and MW-4 At the time of this sampling event, groundwater flow was to the east-northeast The groundwater flow direction had shifted from the westerly direction calculated during the 30 August 1993 sampling event Because the groundwater flow direction was to the east-northeast, groundwater samples were not collected from wells MW-2, MW-3 or MW-4, located upgradient of well MW-1, or from well MW-5 located cross-gradient from well MW-1 Table 1 presents current and historical groundwater elevation data Prior to sampling well MW-1, the well was purged using a Teflon bailer During purging, the pH, temperature, conductivity and volume of water purged from the well was monitored and recorded This information is included in the attached Groundwater Purge and Sample Forms The purge water was collected in the 55-gallon drum at the site One original and one duplicate groundwater sample were collected from MW-1 using a disposable bailer The collected groundwater samples were transported in a chilled ice-chest with a Chain-of-Custody form to Anlab Analytical Laboratory in Sacramento, California The samples were analyzed for the presence of Total Petroleum Hydrocarbons as both gasoline (TPH-G) and diesel fuel (TPH-D) using modified EPA Method 8015 i r