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San Joaquin County
<br /> Environmental Health Department DIRECTOR
<br /> Donna Heran, REHS
<br /> , 1868 East Hazelton Avenue
<br /> / � Stockton , California 95205-6232 PROGRAM COORDINATORS
<br /> JLL_Illr 1�_ Robert McClellon, REHS
<br /> _ Jeff Carruesco, RENS, RDI
<br /> Kasey
<br /> • �'q' : . , , , , , / '�P • Website: www.sjgov.org/ehd Linda Foley, RENS
<br /> Linda Turkatte, REHS
<br /> Phone : (209) 468-3420 Rodney Estrada, REHS
<br /> Fax: (209) 464-0138 Adrienne Ellsaesser, REHS
<br /> January 22, 2014
<br /> Ms. Marion Canepa
<br /> Canepa's Car Wash
<br /> 1536 North Hunter
<br /> Stockton , California 95204-5915
<br /> Subject: Canepa's Car Wash
<br /> 6230 Pacific Avenue
<br /> Stockton, California 95207=3712
<br /> Dear Ms . Canepa:
<br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed
<br /> Groundwater Remediation Feasibility Study Work Plan (work plan) dated 16 December 2013,
<br /> prepared and submitted by your consulting firm , Advanced GeoEnvironmental Inc. (AGE) , on
<br /> your behalf for the above-referenced site . AGE had first recommended that a work plan be
<br /> submitted to conduct an in-situ chemical oxidation (ISCO) pilot test in Feasibility Study Report,
<br /> dated 13 August 2013; and the EHD had conditionally approved by letter dated 14 October
<br /> 2013 the submittal of a work plan to determine the effects of a chemical oxidant on the
<br /> subsurface groundwater contaminants of concern and the formation of harmful bi-products such
<br /> as hexavalent chromium .
<br /> In the work plan, AGE proposes:
<br /> Collection of background/baseline groundwater field parameters [depth-to-water,
<br /> temperature, pH, total dissolved solids (TDS) , oxygen reduction potential (ORP) , salinity,
<br /> turbidity, and dissolved oxygen (DO)]; and chemical analyses [total petroleum
<br /> hydrocarbons as gasoline (TPH-g) , volatile organic compounds (VOCs) by
<br /> Environmental Protection Agency (EPA) method 82606, bromate, bromide, chloride,
<br /> nitrate, nitrate as nitrogen , nitrate as nitrate ion (N031 sulfate, hexavalent chromium ,
<br /> aluminum , antimony, arsenic, barium , beryllium , cadmium , chromium III , calcium , cobalt,
<br /> copper, iron , lead, magnesium, manganese, mercury, molybdenum , nickel, potassium ,
<br /> selenium, silver, sodium , thallium , tungsten, and vanadium] by monitoring and sampling
<br /> monitoring wells MWA , MW-2, MW-3, MW-6 and soil vapor well SV-5 or SV-8 prior to
<br /> the first hydrogen peroxide application ;
<br /> Preparation of a five percent solution of hydrogen peroxide in an acidified solution of
<br /> sulfuric acid as described in Section 5. 1 of the work plan ;
<br /> A Performance of four hydrogen peroxide injection events at two-week intervals , using
<br /> either pressure injection or gravity feeding techniques , at dedicated injection points
<br /> SV-4, SW5, SV-7 and SV-8;
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