SITE INFORMATION AND CORRESPONDENCE FILE 1

Home Browse Search

San Joaquin County oPQ_ � .o.�.,"• .� Environmental Health Department DIRECTOR 1868 East Hazelton Avenue Linda Turkatte, RENS Stockton, California 95205-6232 PROGRAM COORDINATORS Robert McClellan,REHS Jeff Carruesco,REHS, RDI Website: www,sjgov.org/ehd Kasey Foley, REHS �iFos Phone: (209) 468-3420 Rodney Estrada, REHS Adrienne Ellsaesser,REHS Fax: (209) 464-0138 April 3, 2015 Mr. Steve Azevedo West Clay Properties/Knife River Corporation Post Office Box 6099 Stockton, California 95206 Subject: West Clay Properties 639 (revised 655) West Clay Street Stockton, California 95206 Dear Mr. Azevedo: The San Joaquin County Environmental Health Department (EHD) has received and reviewed Additional Site Assessment Work Plan (Work Plan), dated 27 February 2015, prepared and submitted by your consulting firm, Advanced GeoEnvironmental, Inc. (AGE), on your behalf for the above-referenced site. By letter dated 30 January 2015, the EHD had directed the submittal of a work plan to define the petroleum hydrocarbon contamination plume down-gradient of the southern former underground storage tank (UST) area in Hydrogeologic Unit 2 (HU2), defined by AGE as extending between approximately thirty-one and seventy-two feet below surface grade (bsg) In the Work Plan, AGE proposes to: • Advance three or four soil probe borings using direct push drill technology to approximately forty to fifty feet bsg to collect "deep" grab groundwater samples; • Advance the three soil borings in the landscape between the sidewalk and street on the west side of South Harrison Street in the City of Stockton right-of-way; three of the proposed soil borings will be advanced in front of homes at 1235, 1217, and 1215 Harrison Street as illustrated on Figure 2 of the Work Plan and a fourth proposed soil boring may be advanced approximately fifty feet north of 1215 Harrison Street if field observations from the initial three proposed soil borings warrant the additional borehole; • Collect grab groundwater samples using a Geoprobe water sampling assembly driven four feet into the deeper, water-bearing zone HU2 at approximately fifty feet bsg; • Analyze grab groundwater samples for total petroleum hydrocarbons (TPH) as gasoline (TPH-g); TPH as diesel (TPH-d); benzene, toluene, ethylbenzene and total xylenes (BTEX); methyl tertiary-butyl ether (MTBE), ethyl tertiary-butyl ether (ETBE), tertiary- amyl methyl ether (TAME), di-isopropyl ether (DIPE), tertiary-butyl alcohol (TBA), ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA);