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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> R..rlii e A Donna K. Hran, R.E. S. Carl Bergman, R.E.H.S.304 East Weber fV0IIllE, Third FlOOi <br /> � Director <br /> Mike Huggins, R.E.H.S., R.D.I . <br /> 11.41'1- Al Olsen, R.E.H.S. StOCICtOn, California 95202-2708 Douglas W. Wilson, R.E.H.S. <br /> Program Manager Telephone: (209) 468-3420 Margaret Lagorio, R.E.H.S. <br /> 9 � � FORd Laurie A. Cotulla, R.E.H.S. <br /> Fax: (209) RobertMccteuon, R.E.xs. <br /> Program Manager Mark Barcellos, R.E.H.S. <br /> MAY 1 4 2002 <br /> LAWRENCE H BEASLEY <br /> 2120 PEBBLE DRIVE <br /> ALAMO CA 94507 <br /> RE : Former Apache Plastics Site SITE CODE : 2313 <br /> 2050 Fremont Street <br /> Stockton CA 95209 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed the <br /> "Work Plan for Additional Site Assessment, Former Apache Plastics Facility" dated April 9 , <br /> 2002 that was prepared on your behalf by Stratus Environmental , Inc. (Stratus) and has <br /> the following comments . <br /> The work plan proposes the installation of two additional monitoring wells, the destruction <br /> and reinstallation of two existing monitoring wells, the destruction of two manometer <br /> points and the destruction of the dual-cased soil vapor extraction well SVE-1 . All soil and <br /> groundwater samples collected during this phase of work will be submitted for analysis by <br /> EPA Method 8015 DHS/LUFT for total petroleum hydrocarbons as gasoline (TPHg ) , and <br /> by EPA Method 8260 for benzene, toluene, ethylbenzen% and xylenes , fuel oxygenates <br /> and 1 ,24chloroethane. The work plan also proposes the redevelopment of monitoring <br /> wells MW-8 and MW-9, which contain several feet of silt, and the completion of a <br /> well/sensitive receptor survey. <br /> SJC/EHD does not approve the work plan as submitted . Please submit an addendum to <br /> address the following points. <br /> 1 . Provide the rationakfor locations and completion depths of proposed <br /> monitoring wells MWA5 and MW-16. The rational should be put in the context <br /> of a site conceptual model. <br /> 2 . Provide the rationakfor not replacing MW-3 at its current screened interval , and <br /> the rational for the proposed deeper screened interval of MWA4. Put the <br /> rational in the context of the site conceptual model . <br /> 3. SJC/EHD does not approve the proposed completion depth of MW-13. <br /> Referring to cross-section C-C', it appears that the proposed screen interval <br /> would provide a vertical conduit between two distinct sand units. Provide a <br /> rational for placing the screen interval in one sand unit or the other in the <br /> context of the site conceptual model. SJC/EHD recommends focusing on the <br /> lower, thicker, laterally continuous sand, using a shorter screen interval. <br /> 4. Ethylene dibromide must be included in the EPA Method 8260 analysis; in <br /> addition , all peaks detected on the EPA Method 8260 run should be reported . <br /> 5. Include all data acquired from new borings/wells on cross sections and <br /> incorporate them in the site conceptual model . <br />