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FOURTH QUARTER, 2002 GROUNDWATER MONITORING REPORT AND ADDITIONAL ASSESSMENT REPORT JAMAR OIL DISTRIBUTION MARCH 2003 In HP-2, soil samples were collected from a clayey silt with minor sand layer at 15-feet bgs, from a silty clay layer at 30-feet bgs, and from a clayey silt layer at 45-feet bgs In HP-3, soil samples were collected from a silt layer at 25-feet bgs, from a clayey silt layer at 42-feet bgs, and from a sandy silt layer at 52 5-feet bgs The soil sample htholognes are shown on the soil boring logs which are included as Appendix D Two groundwater samples were collected from each geoprobe boring for laboratory analysis Based on an analysis of the CPT boring logs, it was determined that there were two potentially distinct groundwater levels in each of the geoprobe boring locations Groundwater samples were taken from approximately 65-feet bgs and 100-feet bgs in all three geoprobe borings The sample for 1HP-1 at 65-feet was taken from the adjacent monitoring well MW-4 which is screened at that interval and where the depth to water was 65-feet bgs The sample from HP-3 at 65-feet was taken more than 12 hours after the geoprobe was installed because of a lack of water in the hole The water levels for each of the bongs are shown on the soil boring logs which are included as Appendix D All of the geoprobe borings were abandoned by filling the bonngs to the surface with cement grout, using a trenume pipe, according to County regulations and permit requirements Soil Sampling and Analysis The soil samples were collected with 1 5-inch diameter hollow stem rods fitted with a large bore soil sampling assembly loaded with acetate sleeves The samples were transported using proper sample handling and COC protocol established by the USEPA The samples were labeled with the date, time, identifying boring number, and depth, stored in a cooler at 4° Centigrade or less, and transported to a state certified laboratory under completed COC documentation The soil samples were analyzed for TPH G and TPH D using EPA Method 8015 Modified and for BTEX, 1,2-DCA, EDB and the fuel oxygenates DIPE,ETBE, MTBE, TAME, and TBA using EPA Method 8260B The analyses were conducted by SunStar Laboratories Inc , a California State certified laboratory, in accordance with state guidelines and EPA protocol Groundwater Sampling and Analysis Groundwater samples were collected from each geoprobe using a Hydropunch sampler and polypropylene tubing The samples were placed into laboratory prepared containers, using proper sample handling and chain-of-custody (COC) protocol established by the USEPA The samples were labeled with the date, tune,identifying geoprobe number, and depth, stored in a cooler at 4° Centigrade or less, and transported to a state certified laboratory under completed COC . documentation 7