# IILFR

ENVIRONMENTAL MANAGEMENT & 

### CONSULTING**ENGJNEERJ~JG**



## June 7, 2007

Mr. Dante Rodriguez, P.E. Montrose Project Manager United States Environmental Protection Agency, Region 9 75 Hawthorne Street San Francisco, California 94105 SFUND RECORDS CTR 

# 2277844

001-0 19 54-04-004

Subject: Response to United States Environmental Protection Agency, Region 9, May 18, 2007 Letter Regarding Abandonment of Selected Groundwater Monitoring and Former Extraction Wells at the Former Sola Optical U.S.A., Inc. Facility, 1500 Cader Lane, Petaluma, California

Dear Mr. Rodriguez:

LFR Inc. (LFR) has prepared this letter on behalf of American Optical, Sola (formerly Sola Optical U.S.A., Inc.) in response to a letter from the United States Environmental Protection Agency (U.S. EPA), Region 9, dated May 18, 2007 ("the Letter") requesting additional information regarding the abandonment of groundwater monitoring and former extraction wells at the former Sola Optical U.S.A., Inc. facility located at 1500 Cader Lane, Petaluma, California ("the Site").

LFR requested approval from the U.S. EPA to abandon three groundwater monitoring wells (W22, W-25, and LF-2) and three former groundwater extraction wells (E-3, E-5, and E-7) at the Site ("the Wells") in LFR's report entitled "Groundwater Monitoring and Additional Site Activities Report, July through December 2006, Former Sola Optical U.S.A., Inc. Facility, 1500 Cader Lane, Petaluma, California," dated February 9, 2007. The U.S. EPA responded to LFR's request with the Letter, which requested the following information:

• updated concentration-versus-time graphs for wells proposed for abandonment

• a demonstration that applicable relevant appropriate requirements (ARARs) have been attained

• a map showing the locations of the wells to be retained and those proposed for abandonment,
as well as an explanation of why the reduced number of wells is appropriate for ongoing natural attenuation monitoring

The following sections of this letter provide the requested information.

510.652.4500 m 510.652.2246 f 1900 Powell Street. 12th Floor www.lfr.com Emeryville, California 94608-1814 Offices Nationwide

# iJLFR

Concentration- Versus- Time Graphs 

## Updated concentration-versus-time graphs for the Wells are attached as Figures I through I2. Separate graphs for I, I-dichloroethene (1, 

## 1- DCE) versus time and one for I, 1-dichloroethane (1, 

## IDCA) versus time are provided for each of the six wells, for a total of 12 graphs. The maximum contaminant level (MCL) for each chemical compound is shown on each graph as a red line.

ARARs


## The primary ARARs are federal and State of California drinking water standards (i.e., MCLs), and state regulations regarding environmental restrictive covenants. The state MCL for I, I-DCE in groundwater is 6 micrograms per liter (p,g/1), and the state and federal MCL for 1, 

## I-DCA is 5 p,g/1. U.S. EPA guidelines require that the cleanup goals be met and maintained for a minimum period of two years following initial attainment (U.S. EPA I994a). Results from semiannual groundwater monitoring conducted over the past 20 years, including the past 10 years since the groundwater extraction and treatment system was shut down, indicate that concentrations of both 1, 1-DCE and 1, I-DCA in groundwater at each of the six wells have been below their respective MCLs for a minimum of 3 years (range from 3 to I9 years).

The primary institutional control for the Site is a restrictive covenant, also known as a deed restriction. The restrictive covenant adopted for the Site restricts the use of groundwater contaminated above the cleanup level. An additional covenant in the form of a note was placed with the Sonoma County Permit and Resource Management Department (PRMD), 

## which issues all well installation permits for the county. The note states that the parcel that lies directly above contaminated groundwater is part of a Superfund site and that well permits should not be issued before consulting with the PRMD 

## and the U.S. EPA. Both covenants have subsequently been enacted by the U.S. EPA.

Map and Rationale



## A site map showing the locations of wells proposed for abandonment (red), the well retained for monitored natural attenuation (MNA) monitoring (blue), and contingency wells (black) is attached
as Figure 13. According to U.S. EPA guidelines (U.S. EPA 2004b), when MNA is the approved remedial action for a site, it is appropriate to remove monitoring wells from the sampling program and abandon them once they have reached and remained below the cleanup goal (in this case MCLs) for a minimum of two years. The monitoring program for the Site since January 2003 has consisted of the following seven monitoring and former extraction wells: W-22, W-25, W-27, LF-2, E-3, E-5, and E-7. In accordance with U.S. EPA guidelines, six of these wells have been proposed for abandonment and well W-27 has been retained in compliance with the MNA remedy for the Site.

ltr-response _to_ EPA-Jun07-0!954.doc:lfr 

### 2

# l!il LFR

The three former extraction wells (E-1, E-2, and E-4) indicated in black on Figure 13 are contingency wells associated with the MNA remedy. They can be used for groundwater remediation, if necessary, in the unlikely event that the current trends in well W-27 reverse.
Please note that, since 1999, 51 monitoring and extraction wells at the Site have been abandoned, with EPA approval, as they have come into compliance (Figure 14).

Thank you for your attention to this matter. Please call me at (510) 596-9638 with any questions or comments. Sincerely,

Larr puyade Senior Project Geologist

Enclosure: Figures 1 through 14

cc: Sandy Trocki, Carl Zeiss Vision Inc. Roman Starno Herbert Levine, U.S. EPA

References



## U.S. Environmental Protection Agency (U.S. EPA). 2004a. Performance Monitoring of MNA Remedies for VOCs in Groundwater. Chapter 4, Section 4.5. April.

---. 2004b. Performance Monitoring of MNA Remedies for VOCs in Groundwater. Chapter 4, Section 4.6. April.

ltr-response_to

_ EPA-Jun07-0!954.doc:lfr 

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