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PUBLICHLALTH SERVICES <br /> ggg l oPooiry c <br /> r SAN JOAQUIN COUNTY s <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 4CiFo"fRN� <br /> 209/468-3420 <br /> COPY LAWRENCE H BEASLEY <br /> 2120 PEBBLE DRIVE JAN O 6 2000 <br /> ALAMO CA 94507 <br /> RE : Former Apache Plastics Site SITE CODE : 2313 <br /> 2050 E Fremont Street <br /> Stockton CA 95209 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has reviewed the Work Plan to Conduct ;a Soil and Groundwater Investigation dated <br /> December 3, 1999 that was submitted by Stratus Environmental , Inc. (Stratus) on behalf <br /> of the above referenced site and has the following comments . <br /> The work plan proposes to continue the investigation of the vertical and lateral extent of <br /> the documented contamination at this site with a series of twelve electronic Cone <br /> Penetrometer Test (CPT) direct-push borings , followed by the installation of a minimum <br /> of three monitoring ells set at 105-feet below surface grade (bsg) . The first CPT boring <br /> will be advanced near existing on-site monitoring well MW-9 to an anticipated depth of <br /> 140-feet bsg., Soil and water samples from this boring will be analyzed on a 24-hour turn <br /> around time and will be used to determine the appropriate depth of the remaining eleven <br /> borings . Seven water and four soil samples will be collected from each boring and <br /> submitted for laboratory analysis. After the results of these analyses are received and <br /> reviewed , the proper locations for the monitoring wells will be determined . <br /> Review of the soil data from previous fieldwork at this site indicates that the vertical <br /> extent of petroleum hydrocarbon contamination in soil was never defined in the source <br /> area (the former tank pit) . The lateral extent of shallow (to 70-feet bsg) soil <br /> contamination has been defined to the west, south and east of the source area . No <br /> borings were ever advanced north of this area. The most recent fieldwork, the <br /> installation of MW-9 to 105-feet bsg and MW-8 to 106-feet bsg , indicates that the vertical <br /> extent of the soil contamination and the lateral extent at depth remains undefined . <br /> Review of historical groundwater sampling data indicates that the main contaminant <br /> impact to groundwater was near the source area (VEW-1 ) . The most recent <br /> groundwater monitoring event took place on September 1 , 1999. Analytical results <br /> indicate significant contaminant impact remains in the source area and at depth (VEW-2, <br /> MW-9 and MW-8) , with moderate to minor impact in all peripheral wells. Prevailing <br /> groundwater flow direction has been reported as tending towards the southeast. <br /> A Division of San Joaquin County Health Care Services <br />