|
San Joaquin County
<br /> Environmental Health Department
<br /> :
<br /> DIRECTOR
<br /> _` 1868 East Hazelton Avenue Donna Heran,REHS
<br /> Qqt
<br /> ` Stockton, California 95205-6232 PROGRAM COORDINATORS
<br /> Robert McClellon,REHS
<br /> Jeff Carruesco, REHS,RDI
<br /> cq tiii6 i��P Website: www.sjgov.org/ehd Kasey Foley,REHS
<br /> Phone: (209)468-3420 Linda Turkatte, REHS
<br /> Fax: (209) 464-0138 Rodney Estrada,REHS
<br /> Adrienne Ellsaesser,REHS
<br /> Jon Armstrong October 13, 2014
<br /> BP West Coast Products LLC
<br /> 501 Westlake Park Boulevard
<br /> Houston, TX 77079
<br /> Subject: Former ARCO Station #595 `
<br /> 6100 North Highway 99
<br /> Stockton, CA 95212
<br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Site Assessment
<br /> Work Plan (SAWP), dated 3 September 2014, prepared and submitted by your consulting firm,
<br /> Arcadis, Inc., on your behalf for the above-referenced site.
<br /> In the SAWP, Arcadis has proposed a scope of work that includes:
<br /> • Advancing five soil borings by direct push technique to collect soil samples for laboratory
<br /> analysis;
<br /> • Collecting soil samples in the depth ranges of 3 to 5 feet below surface grade (bgs), 5 to
<br /> 10 feet bsg, and 9 to 9.5 feet bsg if no staining or odor is noted in the 5 and 10 feet bsg
<br /> samples;
<br /> • Chemical analysis of the soil samples for benzene and ethylbenzene by a California-
<br /> certified analytical laboratory;
<br /> • Purging water supply well DW-1 R, measuring and recording specific conductivity, volume,
<br /> temperature, pH, oxygen reduction potential (ORP), turbidity, and dissolved oxygen (DO);
<br /> • Sampling groundwater from DW-1 R utilizing a dedicated pump;
<br /> • Chemical analysis of the groundwater sample by a California-certified analytical laboratory
<br /> for total petroleum hydrocarbons - gasoline range organics (TPH-GR); benzene, toluene,
<br /> ethylbenzene and total xylenes (BTEX); methyl tertiary-butyl ether (MTBE), tertiary-butyl
<br /> alcohol (TBA), 1,2-dichlorethane (1,2-DCA), and naphthalene;
<br /> • Conducting a 6-month well transducer study utilizing eleven wells (DMW-1R, DMW-2R,
<br /> DMW-3R, DM-1R, MW-3R, MW-4, MW-6R, MW-8R, MW-9, and MW-1 OR) to improve the
<br /> conceptual site model and evaluate plume stability;
<br /> • Installing four nested soil vapor probes (SVP-1, SVP-2, SVP-3, and SVP-4) at 5 and 10
<br /> feet bsg to evaluate potential vapor intrusion to indoor air and the risk to human health;
<br /> soil samples will be collected from the probe borings between 0 and 5 feet bsg and 5 and
<br /> 10 feet bsg;
<br /> • Collecting soil vapor samples from the vapor probes for analysis by a California-certified
<br /> laboratory for the following constituents: benzene, ethylbenzene, naphthalene, fixed
<br /> gases, including oxygen, carbon dioxide, methane and helium;
<br />
|