Laserfiche WebLink
"'" San Joaquin County <br /> ntal Health Department <br /> DIRECTOR <br /> z. 600 East Main Street Donna Heran, REHS <br /> Q: <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> • Robert McClellon, REHS <br /> Jeff Carruesco,REHS, RDI <br /> cgCjFo`RN�P Website: www.sjgov.org/ehd Kasey Foley,REHS <br /> Phone: (209)468-3420 i <br /> Fax: (209)464-0138 <br /> September 17, 2010 <br /> i <br /> Ms. Stephanie A. McKenna 4 <br /> I <br /> Chevron Environmental Management Company <br /> 6111 Bollinger Canyon.Road, Room 3652 <br /> San Ramon, CA 94583 <br /> Subject: Former Chevron Service Station 9-0557 <br /> 139 South Center Street <br /> Stockton, California <br /> Dear Ms. McKenna: <br /> I <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed ' <br /> Site Assessment Work Plan (work plan), dated 23 July 2010, prepared by your consultant, <br /> Holguin, Fahan & Associates, Inc. (HFA). The work plan was submitted in response to a letter <br /> dated 06 May 2010, in which the EHD stated that petroleum hydrocarbon contaminants had <br /> not been delineated vertically and laterally in groundwater at this site, and that contaminants <br /> of concern had not been delineated vertically in soil near the former underground storage <br /> tanks (USTs) removed in 1990. <br /> In the work plan, HFA proposes to: <br /> • Advance four soil borings to approximately 140 feet below surface grade (bsg) at <br /> locations illustrated on Figure 2 of the work plan; <br /> • Characterize subsurface lithology using cone penetration test (CPT)technology; <br /> • Collect grab groundwater samples using Hydropunch® technology at thirty-foot <br /> intervals beginning at the water table (approximately 20 feet bsg) to total depth for <br /> each borehole; <br /> • Collect soil samples for-laboratory analysis at 10-foot intervals, beginning at 10 feet <br /> bsg, to the water table; <br /> • Screen the soil samples in the field using a photoionization detector (PID) and submit <br /> soil samples with PID readings greater than 100 parts per million by volume (ppmv), <br /> and all grab groundwater samples, to an analytical laboratory for chemical analysis. <br /> • Analyze the soil and groundwater samples for benzene, toluene, ethylbenzene, and <br /> E <br />